feat!: Store eth tx index separately (#1121)

* Store eth tx index separately Closes: #1075 Solution: - run a optional indexer service - adapt the json-rpc to the more efficient query changelog changelog fix lint fix backward compatibility fix lint timeout better strconv fix linter fix package name add cli command to index old tx fix for loop indexer cmd don't have access to local rpc workaround exceed block gas limit situation add unit tests for indexer refactor polish the indexer module Update server/config/toml.go Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com> improve comments share code between GetTxByEthHash and GetTxByIndex fix unit test Update server/indexer.go Co-authored-by: Freddy Caceres <facs95@gmail.com> * Apply suggestions from code review * test enable-indexer in integration test * fix go lint * address review suggestions * fix linter * address review suggestions - test indexer in backend unit test - add comments * fix build * fix test * service name Co-authored-by: Freddy Caceres <facs95@gmail.com> Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
2022-08-12 04:49:05 +08:00 · 2022-08-12 04:49:05 +08:00 · 77ed4aa754
commit 77ed4aa754
parent 737c1de694
31 changed files with 1559 additions and 345 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -92,6 +92,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (rpc) [\#1143](https://github.com/evmos/ethermint/pull/1143) Restrict unprotected txs on the node JSON-RPC configuration.
 * (all) [\#1137](https://github.com/evmos/ethermint/pull/1137) Rename go module to `evmos/ethermint`

+### API Breaking
+
+- (json-rpc) [tharsis#1121](https://github.com/tharsis/ethermint/pull/1121) Store eth tx index separately
+
 ### Improvements

 * (deps) [\#1147](https://github.com/evmos/ethermint/pull/1147) Bump Go version to `1.18`.
--- a/default.nix
+++ b/default.nix
@ -17,7 +17,7 @@ in
 buildGoApplication rec {
  inherit pname version tags ldflags;
  src = lib.sourceByRegex ./. [
-    "^(x|app|cmd|client|server|crypto|rpc|types|encoding|ethereum|testutil|version|go.mod|go.sum|gomod2nix.toml)($|/.*)"
+    "^(x|app|cmd|client|server|crypto|rpc|types|encoding|ethereum|indexer|testutil|version|go.mod|go.sum|gomod2nix.toml)($|/.*)"
    "^tests(/.*[.]go)?$"
  ];
  modules = ./gomod2nix.toml;
--- a/docs/api/proto-docs.md
+++ b/docs/api/proto-docs.md
@ -82,6 +82,9 @@
 - [ethermint/types/v1/dynamic_fee.proto](#ethermint/types/v1/dynamic_fee.proto)
    - [ExtensionOptionDynamicFeeTx](#ethermint.types.v1.ExtensionOptionDynamicFeeTx)
  
+- [ethermint/types/v1/indexer.proto](#ethermint/types/v1/indexer.proto)
+    - [TxResult](#ethermint.types.v1.TxResult)
+  
 - [ethermint/types/v1/web3.proto](#ethermint/types/v1/web3.proto)
    - [ExtensionOptionsWeb3Tx](#ethermint.types.v1.ExtensionOptionsWeb3Tx)
  
@ -1168,6 +1171,43 @@ ExtensionOptionDynamicFeeTx is an extension option that specify the maxPrioPrice



+ <!-- end messages -->
+
+ <!-- end enums -->
+
+ <!-- end HasExtensions -->
+
+ <!-- end services -->
+
+
+
+<a name="ethermint/types/v1/indexer.proto"></a>
+<p align="right"><a href="#top">Top</a></p>
+
+## ethermint/types/v1/indexer.proto
+
+
+
+<a name="ethermint.types.v1.TxResult"></a>
+
+### TxResult
+TxResult is the value stored in eth tx indexer
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `height` | [int64](#int64) |  | the block height |
+| `tx_index` | [uint32](#uint32) |  | cosmos tx index |
+| `msg_index` | [uint32](#uint32) |  | the msg index in a batch tx |
+| `eth_tx_index` | [int32](#int32) |  | eth tx index, the index in the list of valid eth tx in the block, aka. the transaction list returned by eth_getBlock api. |
+| `failed` | [bool](#bool) |  | if the eth tx is failed |
+| `gas_used` | [uint64](#uint64) |  | gas used by tx, if exceeds block gas limit, it's set to gas limit which is what's actually deducted by ante handler. |
+| `cumulative_gas_used` | [uint64](#uint64) |  | the cumulative gas used within current batch tx |
+
+
+
+
+
 <!-- end messages -->

 <!-- end enums -->
--- a/indexer/kv_indexer.go
+++ b/indexer/kv_indexer.go
@ -0,0 +1,230 @@
+package indexer
+
+import (
+	"fmt"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+	authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
+	"github.com/ethereum/go-ethereum/common"
+	rpctypes "github.com/evmos/ethermint/rpc/types"
+	abci "github.com/tendermint/tendermint/abci/types"
+	"github.com/tendermint/tendermint/libs/log"
+	tmtypes "github.com/tendermint/tendermint/types"
+	dbm "github.com/tendermint/tm-db"
+
+	ethermint "github.com/evmos/ethermint/types"
+	evmtypes "github.com/evmos/ethermint/x/evm/types"
+)
+
+const (
+	KeyPrefixTxHash  = 1
+	KeyPrefixTxIndex = 2
+
+	// TxIndexKeyLength is the length of tx-index key
+	TxIndexKeyLength = 1 + 8 + 8
+)
+
+var _ ethermint.EVMTxIndexer = &KVIndexer{}
+
+// KVIndexer implements a eth tx indexer on a KV db.
+type KVIndexer struct {
+	db        dbm.DB
+	logger    log.Logger
+	clientCtx client.Context
+}
+
+// NewKVIndexer creates the KVIndexer
+func NewKVIndexer(db dbm.DB, logger log.Logger, clientCtx client.Context) *KVIndexer {
+	return &KVIndexer{db, logger, clientCtx}
+}
+
+// IndexBlock index all the eth txs in a block through the following steps:
+// - Iterates over all of the Txs in Block
+// - Parses eth Tx infos from cosmos-sdk events for every TxResult
+// - Iterates over all the messages of the Tx
+// - Builds and stores a indexer.TxResult based on parsed events for every message
+func (kv *KVIndexer) IndexBlock(block *tmtypes.Block, txResults []*abci.ResponseDeliverTx) error {
+	height := block.Header.Height
+
+	batch := kv.db.NewBatch()
+	defer batch.Close()
+
+	// record index of valid eth tx during the iteration
+	var ethTxIndex int32
+	for txIndex, tx := range block.Txs {
+		result := txResults[txIndex]
+		if !rpctypes.TxSuccessOrExceedsBlockGasLimit(result) {
+			continue
+		}
+
+		tx, err := kv.clientCtx.TxConfig.TxDecoder()(tx)
+		if err != nil {
+			kv.logger.Error("Fail to decode tx", "err", err, "block", height, "txIndex", txIndex)
+			continue
+		}
+
+		if !isEthTx(tx) {
+			continue
+		}
+
+		txs, err := rpctypes.ParseTxResult(result, tx)
+		if err != nil {
+			kv.logger.Error("Fail to parse event", "err", err, "block", height, "txIndex", txIndex)
+			continue
+		}
+
+		var cumulativeGasUsed uint64
+		for msgIndex, msg := range tx.GetMsgs() {
+			ethMsg := msg.(*evmtypes.MsgEthereumTx)
+			txHash := common.HexToHash(ethMsg.Hash)
+
+			txResult := ethermint.TxResult{
+				Height:     height,
+				TxIndex:    uint32(txIndex),
+				MsgIndex:   uint32(msgIndex),
+				EthTxIndex: ethTxIndex,
+			}
+			if result.Code != abci.CodeTypeOK {
+				// exceeds block gas limit scenario, set gas used to gas limit because that's what's charged by ante handler.
+				// some old versions don't emit any events, so workaround here directly.
+				txResult.GasUsed = ethMsg.GetGas()
+				txResult.Failed = true
+			} else {
+				parsedTx := txs.GetTxByMsgIndex(msgIndex)
+				if parsedTx == nil {
+					kv.logger.Error("msg index not found in events", "msgIndex", msgIndex)
+					continue
+				}
+				if parsedTx.EthTxIndex >= 0 && parsedTx.EthTxIndex != ethTxIndex {
+					kv.logger.Error("eth tx index don't match", "expect", ethTxIndex, "found", parsedTx.EthTxIndex)
+				}
+				txResult.GasUsed = parsedTx.GasUsed
+				txResult.Failed = parsedTx.Failed
+			}
+
+			cumulativeGasUsed += txResult.GasUsed
+			txResult.CumulativeGasUsed = cumulativeGasUsed
+			ethTxIndex++
+
+			if err := saveTxResult(kv.clientCtx.Codec, batch, txHash, &txResult); err != nil {
+				return sdkerrors.Wrapf(err, "IndexBlock %d", height)
+			}
+		}
+	}
+	if err := batch.Write(); err != nil {
+		return sdkerrors.Wrapf(err, "IndexBlock %d, write batch", block.Height)
+	}
+	return nil
+}
+
+// LastIndexedBlock returns the latest indexed block number, returns -1 if db is empty
+func (kv *KVIndexer) LastIndexedBlock() (int64, error) {
+	return LoadLastBlock(kv.db)
+}
+
+// FirstIndexedBlock returns the first indexed block number, returns -1 if db is empty
+func (kv *KVIndexer) FirstIndexedBlock() (int64, error) {
+	return LoadFirstBlock(kv.db)
+}
+
+// GetByTxHash finds eth tx by eth tx hash
+func (kv *KVIndexer) GetByTxHash(hash common.Hash) (*ethermint.TxResult, error) {
+	bz, err := kv.db.Get(TxHashKey(hash))
+	if err != nil {
+		return nil, sdkerrors.Wrapf(err, "GetByTxHash %s", hash.Hex())
+	}
+	if len(bz) == 0 {
+		return nil, fmt.Errorf("tx not found, hash: %s", hash.Hex())
+	}
+	var txKey ethermint.TxResult
+	if err := kv.clientCtx.Codec.Unmarshal(bz, &txKey); err != nil {
+		return nil, sdkerrors.Wrapf(err, "GetByTxHash %s", hash.Hex())
+	}
+	return &txKey, nil
+}
+
+// GetByBlockAndIndex finds eth tx by block number and eth tx index
+func (kv *KVIndexer) GetByBlockAndIndex(blockNumber int64, txIndex int32) (*ethermint.TxResult, error) {
+	bz, err := kv.db.Get(TxIndexKey(blockNumber, txIndex))
+	if err != nil {
+		return nil, sdkerrors.Wrapf(err, "GetByBlockAndIndex %d %d", blockNumber, txIndex)
+	}
+	if len(bz) == 0 {
+		return nil, fmt.Errorf("tx not found, block: %d, eth-index: %d", blockNumber, txIndex)
+	}
+	return kv.GetByTxHash(common.BytesToHash(bz))
+}
+
+// TxHashKey returns the key for db entry: `tx hash -> tx result struct`
+func TxHashKey(hash common.Hash) []byte {
+	return append([]byte{KeyPrefixTxHash}, hash.Bytes()...)
+}
+
+// TxIndexKey returns the key for db entry: `(block number, tx index) -> tx hash`
+func TxIndexKey(blockNumber int64, txIndex int32) []byte {
+	bz1 := sdk.Uint64ToBigEndian(uint64(blockNumber))
+	bz2 := sdk.Uint64ToBigEndian(uint64(txIndex))
+	return append(append([]byte{KeyPrefixTxIndex}, bz1...), bz2...)
+}
+
+// LoadLastBlock returns the latest indexed block number, returns -1 if db is empty
+func LoadLastBlock(db dbm.DB) (int64, error) {
+	it, err := db.ReverseIterator([]byte{KeyPrefixTxIndex}, []byte{KeyPrefixTxIndex + 1})
+	if err != nil {
+		return 0, sdkerrors.Wrap(err, "LoadLastBlock")
+	}
+	defer it.Close()
+	if !it.Valid() {
+		return -1, nil
+	}
+	return parseBlockNumberFromKey(it.Key())
+}
+
+// LoadFirstBlock loads the first indexed block, returns -1 if db is empty
+func LoadFirstBlock(db dbm.DB) (int64, error) {
+	it, err := db.Iterator([]byte{KeyPrefixTxIndex}, []byte{KeyPrefixTxIndex + 1})
+	if err != nil {
+		return 0, sdkerrors.Wrap(err, "LoadFirstBlock")
+	}
+	defer it.Close()
+	if !it.Valid() {
+		return -1, nil
+	}
+	return parseBlockNumberFromKey(it.Key())
+}
+
+// isEthTx check if the tx is an eth tx
+func isEthTx(tx sdk.Tx) bool {
+	extTx, ok := tx.(authante.HasExtensionOptionsTx)
+	if !ok {
+		return false
+	}
+	opts := extTx.GetExtensionOptions()
+	if len(opts) != 1 || opts[0].GetTypeUrl() != "/ethermint.evm.v1.ExtensionOptionsEthereumTx" {
+		return false
+	}
+	return true
+}
+
+// saveTxResult index the txResult into the kv db batch
+func saveTxResult(codec codec.Codec, batch dbm.Batch, txHash common.Hash, txResult *ethermint.TxResult) error {
+	bz := codec.MustMarshal(txResult)
+	if err := batch.Set(TxHashKey(txHash), bz); err != nil {
+		return sdkerrors.Wrap(err, "set tx-hash key")
+	}
+	if err := batch.Set(TxIndexKey(txResult.Height, txResult.EthTxIndex), txHash.Bytes()); err != nil {
+		return sdkerrors.Wrap(err, "set tx-index key")
+	}
+	return nil
+}
+
+func parseBlockNumberFromKey(key []byte) (int64, error) {
+	if len(key) != TxIndexKeyLength {
+		return 0, fmt.Errorf("wrong tx index key length, expect: %d, got: %d", TxIndexKeyLength, len(key))
+	}
+
+	return int64(sdk.BigEndianToUint64(key[1:9])), nil
+}
--- a/indexer/kv_indexer_test.go
+++ b/indexer/kv_indexer_test.go
@ -0,0 +1,189 @@
+package indexer_test
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/simapp/params"
+	"github.com/ethereum/go-ethereum/common"
+	ethtypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/evmos/ethermint/app"
+	"github.com/evmos/ethermint/crypto/ethsecp256k1"
+	evmenc "github.com/evmos/ethermint/encoding"
+	"github.com/evmos/ethermint/indexer"
+	"github.com/evmos/ethermint/tests"
+	"github.com/evmos/ethermint/x/evm/types"
+	"github.com/stretchr/testify/require"
+	abci "github.com/tendermint/tendermint/abci/types"
+	tmlog "github.com/tendermint/tendermint/libs/log"
+	tmtypes "github.com/tendermint/tendermint/types"
+	dbm "github.com/tendermint/tm-db"
+)
+
+func TestKVIndexer(t *testing.T) {
+	priv, err := ethsecp256k1.GenerateKey()
+	require.NoError(t, err)
+	from := common.BytesToAddress(priv.PubKey().Address().Bytes())
+	signer := tests.NewSigner(priv)
+	ethSigner := ethtypes.LatestSignerForChainID(nil)
+
+	to := common.BigToAddress(big.NewInt(1))
+	tx := types.NewTx(
+		nil, 0, &to, big.NewInt(1000), 21000, nil, nil, nil, nil, nil,
+	)
+	tx.From = from.Hex()
+	require.NoError(t, tx.Sign(ethSigner, signer))
+	txHash := tx.AsTransaction().Hash()
+
+	encodingConfig := MakeEncodingConfig()
+	clientCtx := client.Context{}.WithTxConfig(encodingConfig.TxConfig).WithCodec(encodingConfig.Codec)
+
+	// build cosmos-sdk wrapper tx
+	tmTx, err := tx.BuildTx(clientCtx.TxConfig.NewTxBuilder(), "aphoton")
+	require.NoError(t, err)
+	txBz, err := clientCtx.TxConfig.TxEncoder()(tmTx)
+	require.NoError(t, err)
+
+	// build an invalid wrapper tx
+	builder := clientCtx.TxConfig.NewTxBuilder()
+	require.NoError(t, builder.SetMsgs(tx))
+	tmTx2 := builder.GetTx()
+	txBz2, err := clientCtx.TxConfig.TxEncoder()(tmTx2)
+	require.NoError(t, err)
+
+	testCases := []struct {
+		name        string
+		block       *tmtypes.Block
+		blockResult []*abci.ResponseDeliverTx
+		expSuccess  bool
+	}{
+		{
+			"success, format 1",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code: 0,
+					Events: []abci.Event{
+						{Type: types.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
+							{Key: []byte("ethereumTxHash"), Value: []byte(txHash.Hex())},
+							{Key: []byte("txIndex"), Value: []byte("0")},
+							{Key: []byte("amount"), Value: []byte("1000")},
+							{Key: []byte("txGasUsed"), Value: []byte("21000")},
+							{Key: []byte("txHash"), Value: []byte("")},
+							{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
+						}},
+					},
+				},
+			},
+			true,
+		},
+		{
+			"success, format 2",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code: 0,
+					Events: []abci.Event{
+						{Type: types.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
+							{Key: []byte("ethereumTxHash"), Value: []byte(txHash.Hex())},
+							{Key: []byte("txIndex"), Value: []byte("0")},
+						}},
+						{Type: types.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
+							{Key: []byte("amount"), Value: []byte("1000")},
+							{Key: []byte("txGasUsed"), Value: []byte("21000")},
+							{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
+							{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
+						}},
+					},
+				},
+			},
+			true,
+		},
+		{
+			"success, exceed block gas limit",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code:   11,
+					Log:    "out of gas in location: block gas meter; gasWanted: 21000",
+					Events: []abci.Event{},
+				},
+			},
+			true,
+		},
+		{
+			"fail, failed eth tx",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code:   15,
+					Log:    "nonce mismatch",
+					Events: []abci.Event{},
+				},
+			},
+			false,
+		},
+		{
+			"fail, invalid events",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code:   0,
+					Events: []abci.Event{},
+				},
+			},
+			false,
+		},
+		{
+			"fail, not eth tx",
+			&tmtypes.Block{Header: tmtypes.Header{Height: 1}, Data: tmtypes.Data{Txs: []tmtypes.Tx{txBz2}}},
+			[]*abci.ResponseDeliverTx{
+				&abci.ResponseDeliverTx{
+					Code:   0,
+					Events: []abci.Event{},
+				},
+			},
+			false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			db := dbm.NewMemDB()
+			idxer := indexer.NewKVIndexer(db, tmlog.NewNopLogger(), clientCtx)
+
+			err = idxer.IndexBlock(tc.block, tc.blockResult)
+			require.NoError(t, err)
+			if !tc.expSuccess {
+				first, err := idxer.FirstIndexedBlock()
+				require.NoError(t, err)
+				require.Equal(t, int64(-1), first)
+
+				last, err := idxer.LastIndexedBlock()
+				require.NoError(t, err)
+				require.Equal(t, int64(-1), last)
+			} else {
+				first, err := idxer.FirstIndexedBlock()
+				require.NoError(t, err)
+				require.Equal(t, tc.block.Header.Height, first)
+
+				last, err := idxer.LastIndexedBlock()
+				require.NoError(t, err)
+				require.Equal(t, tc.block.Header.Height, last)
+
+				res1, err := idxer.GetByTxHash(txHash)
+				require.NoError(t, err)
+				require.NotNil(t, res1)
+				res2, err := idxer.GetByBlockAndIndex(1, 0)
+				require.NoError(t, err)
+				require.Equal(t, res1, res2)
+			}
+		})
+	}
+}
+
+// MakeEncodingConfig creates the EncodingConfig
+func MakeEncodingConfig() params.EncodingConfig {
+	return evmenc.MakeConfig(app.ModuleBasics)
+}
--- a/proto/ethermint/types/v1/indexer.proto
+++ b/proto/ethermint/types/v1/indexer.proto
@ -0,0 +1,29 @@
+syntax = "proto3";
+package ethermint.types.v1;
+
+import "gogoproto/gogo.proto";
+
+option go_package = "github.com/evmos/ethermint/types";
+
+// TxResult is the value stored in eth tx indexer
+message TxResult {
+    option (gogoproto.goproto_getters) = false;
+
+    // the block height
+    int64 height = 1;
+    // cosmos tx index
+    uint32 tx_index = 2;
+    // the msg index in a batch tx
+    uint32 msg_index = 3;
+
+    // eth tx index, the index in the list of valid eth tx in the block, 
+    // aka. the transaction list returned by eth_getBlock api.
+    int32 eth_tx_index = 4;
+    // if the eth tx is failed
+    bool failed = 5;
+    // gas used by tx, if exceeds block gas limit,
+    // it's set to gas limit which is what's actually deducted by ante handler.
+    uint64 gas_used = 6;
+    // the cumulative gas used within current batch tx
+    uint64 cumulative_gas_used = 7;
+}
--- a/rpc/apis.go
+++ b/rpc/apis.go
@ -19,6 +19,7 @@ import (
 	"github.com/evmos/ethermint/rpc/namespaces/ethereum/personal"
 	"github.com/evmos/ethermint/rpc/namespaces/ethereum/txpool"
 	"github.com/evmos/ethermint/rpc/namespaces/ethereum/web3"
+	ethermint "github.com/evmos/ethermint/types"

 	rpcclient "github.com/tendermint/tendermint/rpc/jsonrpc/client"
 )
@ -48,6 +49,7 @@ type APICreator = func(
 	clientCtx client.Context,
 	tendermintWebsocketClient *rpcclient.WSClient,
 	allowUnprotectedTxs bool,
+	indexer ethermint.EVMTxIndexer,
 ) []rpc.API

 // apiCreators defines the JSON-RPC API namespaces.
@ -55,8 +57,8 @@ var apiCreators map[string]APICreator

 func init() {
 	apiCreators = map[string]APICreator{
-		EthNamespace: func(ctx *server.Context, clientCtx client.Context, tmWSClient *rpcclient.WSClient, allowUnprotectedTxs bool) []rpc.API {
-			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
+		EthNamespace: func(ctx *server.Context, clientCtx client.Context, tmWSClient *rpcclient.WSClient, allowUnprotectedTxs bool, indexer ethermint.EVMTxIndexer) []rpc.API {
+			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs, indexer)
 			return []rpc.API{
 				{
 					Namespace: EthNamespace,
@ -72,7 +74,7 @@ func init() {
 				},
 			}
 		},
-		Web3Namespace: func(*server.Context, client.Context, *rpcclient.WSClient, bool) []rpc.API {
+		Web3Namespace: func(*server.Context, client.Context, *rpcclient.WSClient, bool, ethermint.EVMTxIndexer) []rpc.API {
 			return []rpc.API{
 				{
 					Namespace: Web3Namespace,
@ -82,7 +84,7 @@ func init() {
 				},
 			}
 		},
-		NetNamespace: func(_ *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, _ bool) []rpc.API {
+		NetNamespace: func(_ *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, _ bool, _ ethermint.EVMTxIndexer) []rpc.API {
 			return []rpc.API{
 				{
 					Namespace: NetNamespace,
@ -92,8 +94,8 @@ func init() {
 				},
 			}
 		},
-		PersonalNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool) []rpc.API {
-			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
+		PersonalNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool, indexer ethermint.EVMTxIndexer) []rpc.API {
+			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs, indexer)
 			return []rpc.API{
 				{
 					Namespace: PersonalNamespace,
@ -103,7 +105,7 @@ func init() {
 				},
 			}
 		},
-		TxPoolNamespace: func(ctx *server.Context, _ client.Context, _ *rpcclient.WSClient, _ bool) []rpc.API {
+		TxPoolNamespace: func(ctx *server.Context, _ client.Context, _ *rpcclient.WSClient, _ bool, _ ethermint.EVMTxIndexer) []rpc.API {
 			return []rpc.API{
 				{
 					Namespace: TxPoolNamespace,
@ -113,8 +115,8 @@ func init() {
 				},
 			}
 		},
-		DebugNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool) []rpc.API {
-			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
+		DebugNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool, indexer ethermint.EVMTxIndexer) []rpc.API {
+			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs, indexer)
 			return []rpc.API{
 				{
 					Namespace: DebugNamespace,
@ -124,8 +126,8 @@ func init() {
 				},
 			}
 		},
-		MinerNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool) []rpc.API {
-			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
+		MinerNamespace: func(ctx *server.Context, clientCtx client.Context, _ *rpcclient.WSClient, allowUnprotectedTxs bool, indexer ethermint.EVMTxIndexer) []rpc.API {
+			evmBackend := backend.NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs, indexer)
 			return []rpc.API{
 				{
 					Namespace: MinerNamespace,
@ -139,12 +141,12 @@ func init() {
 }

 // GetRPCAPIs returns the list of all APIs
-func GetRPCAPIs(ctx *server.Context, clientCtx client.Context, tmWSClient *rpcclient.WSClient, allowUnprotectedTxs bool, selectedAPIs []string) []rpc.API {
+func GetRPCAPIs(ctx *server.Context, clientCtx client.Context, tmWSClient *rpcclient.WSClient, allowUnprotectedTxs bool, indexer ethermint.EVMTxIndexer, selectedAPIs []string) []rpc.API {
 	var apis []rpc.API

 	for _, ns := range selectedAPIs {
 		if creator, ok := apiCreators[ns]; ok {
-			apis = append(apis, creator(ctx, clientCtx, tmWSClient, allowUnprotectedTxs)...)
+			apis = append(apis, creator(ctx, clientCtx, tmWSClient, allowUnprotectedTxs, indexer)...)
 		} else {
 			ctx.Logger.Error("invalid namespace value", "namespace", ns)
 		}
--- a/rpc/backend/backend.go
+++ b/rpc/backend/backend.go
@ -103,8 +103,8 @@ type EVMBackend interface {

 	// Tx Info
 	GetTransactionByHash(txHash common.Hash) (*rpctypes.RPCTransaction, error)
-	GetTxByEthHash(txHash common.Hash) (*tmrpctypes.ResultTx, error)
-	GetTxByTxIndex(height int64, txIndex uint) (*tmrpctypes.ResultTx, error)
+	GetTxByEthHash(txHash common.Hash) (*ethermint.TxResult, error)
+	GetTxByTxIndex(height int64, txIndex uint) (*ethermint.TxResult, error)
 	GetTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)
 	GetTransactionReceipt(hash common.Hash) (map[string]interface{}, error)
 	GetTransactionByBlockHashAndIndex(hash common.Hash, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)
@ -140,10 +140,17 @@ type Backend struct {
 	chainID             *big.Int
 	cfg                 config.Config
 	allowUnprotectedTxs bool
+	indexer             ethermint.EVMTxIndexer
 }

 // NewBackend creates a new Backend instance for cosmos and ethereum namespaces
-func NewBackend(ctx *server.Context, logger log.Logger, clientCtx client.Context, allowUnprotectedTxs bool) *Backend {
+func NewBackend(
+	ctx *server.Context,
+	logger log.Logger,
+	clientCtx client.Context,
+	allowUnprotectedTxs bool,
+	indexer ethermint.EVMTxIndexer,
+) *Backend {
 	chainID, err := ethermint.ParseChainID(clientCtx.ChainID)
 	if err != nil {
 		panic(err)
@ -176,5 +183,6 @@ func NewBackend(ctx *server.Context, logger log.Logger, clientCtx client.Context
 		chainID:             chainID,
 		cfg:                 appConf,
 		allowUnprotectedTxs: allowUnprotectedTxs,
+		indexer:             indexer,
 	}
 }
--- a/rpc/backend/backend_suite_test.go
+++ b/rpc/backend/backend_suite_test.go
@ -8,6 +8,8 @@ import (
 	"path/filepath"
 	"testing"

+	dbm "github.com/tendermint/tm-db"
+
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	"github.com/cosmos/cosmos-sdk/server"
@ -20,6 +22,7 @@ import (
 	"github.com/evmos/ethermint/app"
 	"github.com/evmos/ethermint/crypto/hd"
 	"github.com/evmos/ethermint/encoding"
+	"github.com/evmos/ethermint/indexer"
 	"github.com/evmos/ethermint/rpc/backend/mocks"
 	rpctypes "github.com/evmos/ethermint/rpc/types"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
@ -56,7 +59,9 @@ func (suite *BackendTestSuite) SetupTest() {

 	allowUnprotectedTxs := false

-	suite.backend = NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
+	idxer := indexer.NewKVIndexer(dbm.NewMemDB(), ctx.Logger, clientCtx)
+
+	suite.backend = NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs, idxer)
 	suite.backend.queryClient.QueryClient = mocks.NewQueryClient(suite.T())
 	suite.backend.clientCtx.Client = mocks.NewClient(suite.T())
 	suite.backend.ctx = rpctypes.ContextWithHeight(1)
--- a/rpc/backend/blocks_info.go
+++ b/rpc/backend/blocks_info.go
@ -297,7 +297,7 @@ func (b *Backend) GetEthereumMsgsFromTendermintBlock(
 		// Check if tx exists on EVM by cross checking with blockResults:
 		//  - Include unsuccessful tx that exceeds block gas limit
 		//  - Exclude unsuccessful tx with any other error but ExceedBlockGasLimit
-		if !TxSuccessOrExceedsBlockGasLimit(txResults[i]) {
+		if !rpctypes.TxSuccessOrExceedsBlockGasLimit(txResults[i]) {
 			b.logger.Debug("invalid tx result code", "cosmos-hash", hexutil.Encode(tx.Hash()))
 			continue
 		}
--- a/rpc/backend/evm_backend_test.go
+++ b/rpc/backend/evm_backend_test.go
@ -949,7 +949,7 @@ func (suite *BackendTestSuite) TestGetEthereumMsgsFromTendermintBlock() {
 				TxsResults: []*types.ResponseDeliverTx{
 					{
 						Code: 1,
-						Log:  ExceedBlockGasLimitError,
+						Log:  ethrpc.ExceedBlockGasLimitError,
 					},
 				},
 			},
@ -964,7 +964,7 @@ func (suite *BackendTestSuite) TestGetEthereumMsgsFromTendermintBlock() {
 				TxsResults: []*types.ResponseDeliverTx{
 					{
 						Code: 0,
-						Log:  ExceedBlockGasLimitError,
+						Log:  ethrpc.ExceedBlockGasLimitError,
 					},
 				},
 			},
--- a/rpc/backend/tracing.go
+++ b/rpc/backend/tracing.go
@ -32,23 +32,14 @@ func (b *Backend) TraceTransaction(hash common.Hash, config *evmtypes.TraceConfi
 		return nil, err
 	}

-	parsedTxs, err := rpctypes.ParseTxResult(&transaction.TxResult)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse tx events: %s", hash.Hex())
-	}
-	parsedTx := parsedTxs.GetTxByHash(hash)
-	if parsedTx == nil {
-		return nil, fmt.Errorf("ethereum tx not found in msgs: %s", hash.Hex())
-	}
-
 	// check tx index is not out of bound
-	if uint32(len(blk.Block.Txs)) < transaction.Index {
-		b.logger.Debug("tx index out of bounds", "index", transaction.Index, "hash", hash.String(), "height", blk.Block.Height)
+	if uint32(len(blk.Block.Txs)) < transaction.TxIndex {
+		b.logger.Debug("tx index out of bounds", "index", transaction.TxIndex, "hash", hash.String(), "height", blk.Block.Height)
 		return nil, fmt.Errorf("transaction not included in block %v", blk.Block.Height)
 	}

 	var predecessors []*evmtypes.MsgEthereumTx
-	for _, txBz := range blk.Block.Txs[:transaction.Index] {
+	for _, txBz := range blk.Block.Txs[:transaction.TxIndex] {
 		tx, err := b.clientCtx.TxConfig.TxDecoder()(txBz)
 		if err != nil {
 			b.logger.Debug("failed to decode transaction in block", "height", blk.Block.Height, "error", err.Error())
@ -64,14 +55,14 @@ func (b *Backend) TraceTransaction(hash common.Hash, config *evmtypes.TraceConfi
 		}
 	}

-	tx, err := b.clientCtx.TxConfig.TxDecoder()(transaction.Tx)
+	tx, err := b.clientCtx.TxConfig.TxDecoder()(blk.Block.Txs[transaction.TxIndex])
 	if err != nil {
 		b.logger.Debug("tx not found", "hash", hash)
 		return nil, err
 	}

 	// add predecessor messages in current cosmos tx
-	for i := 0; i < parsedTx.MsgIndex; i++ {
+	for i := 0; i < int(transaction.MsgIndex); i++ {
 		ethMsg, ok := tx.GetMsgs()[i].(*evmtypes.MsgEthereumTx)
 		if !ok {
 			continue
@ -79,7 +70,7 @@ func (b *Backend) TraceTransaction(hash common.Hash, config *evmtypes.TraceConfi
 		predecessors = append(predecessors, ethMsg)
 	}

-	ethMessage, ok := tx.GetMsgs()[parsedTx.MsgIndex].(*evmtypes.MsgEthereumTx)
+	ethMessage, ok := tx.GetMsgs()[transaction.MsgIndex].(*evmtypes.MsgEthereumTx)
 	if !ok {
 		b.logger.Debug("invalid transaction type", "type", fmt.Sprintf("%T", tx))
 		return nil, fmt.Errorf("invalid transaction type %T", tx)
--- a/rpc/backend/tx_info.go
+++ b/rpc/backend/tx_info.go
@ -3,11 +3,14 @@ package backend
 import (
 	"fmt"

+	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	rpctypes "github.com/evmos/ethermint/rpc/types"
+	ethermint "github.com/evmos/ethermint/types"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
 	"github.com/pkg/errors"
 	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
@ -19,87 +22,43 @@ func (b *Backend) GetTransactionByHash(txHash common.Hash) (*rpctypes.RPCTransac
 	hexTx := txHash.Hex()

 	if err != nil {
-		// try to find tx in mempool
-		txs, err := b.PendingTransactions()
-		if err != nil {
-			b.logger.Debug("tx not found", "hash", hexTx, "error", err.Error())
-			return nil, nil
-		}
-
-		for _, tx := range txs {
-			msg, err := evmtypes.UnwrapEthereumMsg(tx, txHash)
-			if err != nil {
-				// not ethereum tx
-				continue
-			}
-
-			if msg.Hash == hexTx {
-				rpctx, err := rpctypes.NewTransactionFromMsg(
-					msg,
-					common.Hash{},
-					uint64(0),
-					uint64(0),
-					nil,
-				)
-				if err != nil {
-					return nil, err
-				}
-				return rpctx, nil
-			}
-		}
-
-		b.logger.Debug("tx not found", "hash", hexTx)
-		return nil, nil
+		return b.getTransactionByHashPending(txHash)
 	}

-	if !TxSuccessOrExceedsBlockGasLimit(&res.TxResult) {
-		return nil, errors.New("invalid ethereum tx")
-	}
-
-	parsedTxs, err := rpctypes.ParseTxResult(&res.TxResult)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse tx events: %s", hexTx)
-	}
-
-	parsedTx := parsedTxs.GetTxByHash(txHash)
-	if parsedTx == nil {
-		return nil, fmt.Errorf("ethereum tx not found in msgs: %s", hexTx)
-	}
-
-	tx, err := b.clientCtx.TxConfig.TxDecoder()(res.Tx)
+	block, err := b.GetTendermintBlockByNumber(rpctypes.BlockNumber(res.Height))
 	if err != nil {
 		return nil, err
 	}

-	// the `msgIndex` is inferred from tx events, should be within the bound.
-	msg, ok := tx.GetMsgs()[parsedTx.MsgIndex].(*evmtypes.MsgEthereumTx)
+	tx, err := b.clientCtx.TxConfig.TxDecoder()(block.Block.Txs[res.TxIndex])
+	if err != nil {
+		return nil, err
+	}
+
+	// the `res.MsgIndex` is inferred from tx index, should be within the bound.
+	msg, ok := tx.GetMsgs()[res.MsgIndex].(*evmtypes.MsgEthereumTx)
 	if !ok {
 		return nil, errors.New("invalid ethereum tx")
 	}

-	block, err := b.clientCtx.Client.Block(b.ctx, &res.Height)
-	if err != nil {
-		b.logger.Debug("block not found", "height", res.Height, "error", err.Error())
-		return nil, err
-	}
-
 	blockRes, err := b.GetTendermintBlockResultByNumber(&block.Block.Height)
 	if err != nil {
 		b.logger.Debug("block result not found", "height", block.Block.Height, "error", err.Error())
 		return nil, nil
 	}

-	if parsedTx.EthTxIndex == -1 {
+	if res.EthTxIndex == -1 {
 		// Fallback to find tx index by iterating all valid eth transactions
 		msgs := b.GetEthereumMsgsFromTendermintBlock(block, blockRes)
 		for i := range msgs {
 			if msgs[i].Hash == hexTx {
-				parsedTx.EthTxIndex = int64(i)
+				res.EthTxIndex = int32(i)
 				break
 			}
 		}
 	}
-	if parsedTx.EthTxIndex == -1 {
+	// if we still unable to find the eth tx index, return error, shouldn't happen.
+	if res.EthTxIndex == -1 {
 		return nil, errors.New("can't find index of ethereum tx")
 	}

@ -113,11 +72,48 @@ func (b *Backend) GetTransactionByHash(txHash common.Hash) (*rpctypes.RPCTransac
 		msg,
 		common.BytesToHash(block.BlockID.Hash.Bytes()),
 		uint64(res.Height),
-		uint64(parsedTx.EthTxIndex),
+		uint64(res.EthTxIndex),
 		baseFee,
 	)
 }

+// getTransactionByHashPending find pending tx from mempool
+func (b *Backend) getTransactionByHashPending(txHash common.Hash) (*rpctypes.RPCTransaction, error) {
+	hexTx := txHash.Hex()
+	// try to find tx in mempool
+	txs, err := b.PendingTransactions()
+	if err != nil {
+		b.logger.Debug("tx not found", "hash", hexTx, "error", err.Error())
+		return nil, nil
+	}
+
+	for _, tx := range txs {
+		msg, err := evmtypes.UnwrapEthereumMsg(tx, txHash)
+		if err != nil {
+			// not ethereum tx
+			continue
+		}
+
+		if msg.Hash == hexTx {
+			// use zero block values since it's not included in a block yet
+			rpctx, err := rpctypes.NewTransactionFromMsg(
+				msg,
+				common.Hash{},
+				uint64(0),
+				uint64(0),
+				nil,
+			)
+			if err != nil {
+				return nil, err
+			}
+			return rpctx, nil
+		}
+	}
+
+	b.logger.Debug("tx not found", "hash", hexTx)
+	return nil, nil
+}
+
 // GetTransactionReceipt returns the transaction receipt identified by hash.
 func (b *Backend) GetTransactionReceipt(hash common.Hash) (map[string]interface{}, error) {
 	hexTx := hash.Hex()
@ -129,44 +125,17 @@ func (b *Backend) GetTransactionReceipt(hash common.Hash) (map[string]interface{
 		return nil, nil
 	}

-	// don't ignore the txs which exceed block gas limit.
-	if !TxSuccessOrExceedsBlockGasLimit(&res.TxResult) {
-		return nil, nil
-	}
-
-	parsedTxs, err := rpctypes.ParseTxResult(&res.TxResult)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse tx events: %s, %v", hexTx, err)
-	}
-
-	parsedTx := parsedTxs.GetTxByHash(hash)
-	if parsedTx == nil {
-		return nil, fmt.Errorf("ethereum tx not found in msgs: %s", hexTx)
-	}
-
-	resBlock, err := b.clientCtx.Client.Block(b.ctx, &res.Height)
+	resBlock, err := b.GetTendermintBlockByNumber(rpctypes.BlockNumber(res.Height))
 	if err != nil {
 		b.logger.Debug("block not found", "height", res.Height, "error", err.Error())
 		return nil, nil
 	}
-
-	tx, err := b.clientCtx.TxConfig.TxDecoder()(res.Tx)
+	tx, err := b.clientCtx.TxConfig.TxDecoder()(resBlock.Block.Txs[res.TxIndex])
 	if err != nil {
 		b.logger.Debug("decoding failed", "error", err.Error())
 		return nil, fmt.Errorf("failed to decode tx: %w", err)
 	}
-
-	if res.TxResult.Code != 0 {
-		// tx failed, we should return gas limit as gas used, because that's how the fee get deducted.
-		for i := 0; i <= parsedTx.MsgIndex; i++ {
-			gasLimit := tx.GetMsgs()[i].(*evmtypes.MsgEthereumTx).GetGas()
-			parsedTxs.Txs[i].GasUsed = gasLimit
-		}
-	}
-
-	// the `msgIndex` is inferred from tx events, should be within the bound,
-	// and the tx is found by eth tx hash, so the msg type must be correct.
-	ethMsg := tx.GetMsgs()[parsedTx.MsgIndex].(*evmtypes.MsgEthereumTx)
+	ethMsg := tx.GetMsgs()[res.MsgIndex].(*evmtypes.MsgEthereumTx)

 	txData, err := evmtypes.UnpackTxData(ethMsg.Data)
 	if err != nil {
@ -180,42 +149,46 @@ func (b *Backend) GetTransactionReceipt(hash common.Hash) (map[string]interface{
 		b.logger.Debug("failed to retrieve block results", "height", res.Height, "error", err.Error())
 		return nil, nil
 	}
-	for i := 0; i < int(res.Index) && i < len(blockRes.TxsResults); i++ {
-		cumulativeGasUsed += uint64(blockRes.TxsResults[i].GasUsed)
+	for _, txResult := range blockRes.TxsResults[0:res.TxIndex] {
+		cumulativeGasUsed += uint64(txResult.GasUsed)
 	}
-	cumulativeGasUsed += parsedTxs.AccumulativeGasUsed(parsedTx.MsgIndex)
+	cumulativeGasUsed += res.CumulativeGasUsed

-	// Get the transaction result from the log
 	var status hexutil.Uint
-	if res.TxResult.Code != 0 || parsedTx.Failed {
+	if res.Failed {
 		status = hexutil.Uint(ethtypes.ReceiptStatusFailed)
 	} else {
 		status = hexutil.Uint(ethtypes.ReceiptStatusSuccessful)
 	}

-	from, err := ethMsg.GetSender(b.chainID)
+	chainID, err := b.ChainID()
+	if err != nil {
+		return nil, err
+	}
+
+	from, err := ethMsg.GetSender(chainID.ToInt())
 	if err != nil {
 		return nil, err
 	}

 	// parse tx logs from events
-	logs, err := parsedTx.ParseTxLogs()
+	logs, err := TxLogsFromEvents(blockRes.TxsResults[res.TxIndex].Events, int(res.MsgIndex))
 	if err != nil {
 		b.logger.Debug("failed to parse logs", "hash", hexTx, "error", err.Error())
 	}

-	if parsedTx.EthTxIndex == -1 {
+	if res.EthTxIndex == -1 {
 		// Fallback to find tx index by iterating all valid eth transactions
 		msgs := b.GetEthereumMsgsFromTendermintBlock(resBlock, blockRes)
 		for i := range msgs {
 			if msgs[i].Hash == hexTx {
-				parsedTx.EthTxIndex = int64(i)
+				res.EthTxIndex = int32(i)
 				break
 			}
 		}
 	}
-
-	if parsedTx.EthTxIndex == -1 {
+	// return error if still unable to find the eth tx index
+	if res.EthTxIndex == -1 {
 		return nil, errors.New("can't find index of ethereum tx")
 	}

@ -230,13 +203,13 @@ func (b *Backend) GetTransactionReceipt(hash common.Hash) (map[string]interface{
 		// They are stored in the chain database.
 		"transactionHash": hash,
 		"contractAddress": nil,
-		"gasUsed":         hexutil.Uint64(parsedTx.GasUsed),
+		"gasUsed":         hexutil.Uint64(res.GasUsed),

 		// Inclusion information: These fields provide information about the inclusion of the
 		// transaction corresponding to this receipt.
 		"blockHash":        common.BytesToHash(resBlock.Block.Header.Hash()).Hex(),
 		"blockNumber":      hexutil.Uint64(res.Height),
-		"transactionIndex": hexutil.Uint64(parsedTx.EthTxIndex),
+		"transactionIndex": hexutil.Uint64(res.EthTxIndex),

 		// sender and receiver (contract or EOA) addreses
 		"from": from,
@ -304,32 +277,66 @@ func (b *Backend) GetTransactionByBlockNumberAndIndex(blockNum rpctypes.BlockNum
 // GetTxByEthHash uses `/tx_query` to find transaction by ethereum tx hash
 // TODO: Don't need to convert once hashing is fixed on Tendermint
 // https://github.com/tendermint/tendermint/issues/6539
-func (b *Backend) GetTxByEthHash(hash common.Hash) (*tmrpctypes.ResultTx, error) {
+func (b *Backend) GetTxByEthHash(hash common.Hash) (*ethermint.TxResult, error) {
+	if b.indexer != nil {
+		return b.indexer.GetByTxHash(hash)
+	}
+
+	// fallback to tendermint tx indexer
 	query := fmt.Sprintf("%s.%s='%s'", evmtypes.TypeMsgEthereumTx, evmtypes.AttributeKeyEthereumTxHash, hash.Hex())
-	resTxs, err := b.clientCtx.Client.TxSearch(b.ctx, query, false, nil, nil, "")
+	txResult, err := b.queryTendermintTxIndexer(query, func(txs *rpctypes.ParsedTxs) *rpctypes.ParsedTx {
+		return txs.GetTxByHash(hash)
+	})
 	if err != nil {
-		return nil, err
+		return nil, sdkerrors.Wrapf(err, "GetTxByEthHash %s", hash.Hex())
 	}
-	if len(resTxs.Txs) == 0 {
-		return nil, errors.Errorf("ethereum tx not found for hash %s", hash.Hex())
-	}
-	return resTxs.Txs[0], nil
+	return txResult, nil
 }

 // GetTxByTxIndex uses `/tx_query` to find transaction by tx index of valid ethereum txs
-func (b *Backend) GetTxByTxIndex(height int64, index uint) (*tmrpctypes.ResultTx, error) {
+func (b *Backend) GetTxByTxIndex(height int64, index uint) (*ethermint.TxResult, error) {
+	if b.indexer != nil {
+		return b.indexer.GetByBlockAndIndex(height, int32(index))
+	}
+
+	// fallback to tendermint tx indexer
 	query := fmt.Sprintf("tx.height=%d AND %s.%s=%d",
 		height, evmtypes.TypeMsgEthereumTx,
 		evmtypes.AttributeKeyTxIndex, index,
 	)
+	txResult, err := b.queryTendermintTxIndexer(query, func(txs *rpctypes.ParsedTxs) *rpctypes.ParsedTx {
+		return txs.GetTxByTxIndex(int(index))
+	})
+	if err != nil {
+		return nil, sdkerrors.Wrapf(err, "GetTxByTxIndex %d %d", height, index)
+	}
+	return txResult, nil
+}
+
+// queryTendermintTxIndexer query tx in tendermint tx indexer
+func (b *Backend) queryTendermintTxIndexer(query string, txGetter func(*rpctypes.ParsedTxs) *rpctypes.ParsedTx) (*ethermint.TxResult, error) {
 	resTxs, err := b.clientCtx.Client.TxSearch(b.ctx, query, false, nil, nil, "")
 	if err != nil {
 		return nil, err
 	}
 	if len(resTxs.Txs) == 0 {
-		return nil, errors.Errorf("ethereum tx not found for block %d index %d", height, index)
+		return nil, errors.New("ethereum tx not found")
 	}
-	return resTxs.Txs[0], nil
+	txResult := resTxs.Txs[0]
+	if !rpctypes.TxSuccessOrExceedsBlockGasLimit(&txResult.TxResult) {
+		return nil, errors.New("invalid ethereum tx")
+	}
+
+	var tx sdk.Tx
+	if txResult.TxResult.Code != 0 {
+		// it's only needed when the tx exceeds block gas limit
+		tx, err = b.clientCtx.TxConfig.TxDecoder()(txResult.Tx)
+		if err != nil {
+			return nil, fmt.Errorf("invalid ethereum tx")
+		}
+	}
+
+	return rpctypes.ParseTxIndexerResult(txResult, tx, txGetter)
 }

 // getTransactionByBlockAndIndex is the common code shared by `GetTransactionByBlockNumberAndIndex` and `GetTransactionByBlockHashAndIndex`.
@ -340,28 +347,18 @@ func (b *Backend) GetTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock, i
 	}

 	var msg *evmtypes.MsgEthereumTx
-	// try /tx_search first
+	// find in tx indexer
 	res, err := b.GetTxByTxIndex(block.Block.Height, uint(idx))
 	if err == nil {
-		tx, err := b.clientCtx.TxConfig.TxDecoder()(res.Tx)
+		tx, err := b.clientCtx.TxConfig.TxDecoder()(block.Block.Txs[res.TxIndex])
 		if err != nil {
 			b.logger.Debug("invalid ethereum tx", "height", block.Block.Header, "index", idx)
 			return nil, nil
 		}

-		parsedTxs, err := rpctypes.ParseTxResult(&res.TxResult)
-		if err != nil {
-			return nil, fmt.Errorf("failed to parse tx events: %d, %v", idx, err)
-		}
-
-		parsedTx := parsedTxs.GetTxByTxIndex(int(idx))
-		if parsedTx == nil {
-			return nil, fmt.Errorf("ethereum tx not found in msgs: %d", idx)
-		}
-
 		var ok bool
 		// msgIndex is inferred from tx events, should be within bound.
-		msg, ok = tx.GetMsgs()[parsedTx.MsgIndex].(*evmtypes.MsgEthereumTx)
+		msg, ok = tx.GetMsgs()[res.MsgIndex].(*evmtypes.MsgEthereumTx)
 		if !ok {
 			b.logger.Debug("invalid ethereum tx", "height", block.Block.Header, "index", idx)
 			return nil, nil
--- a/rpc/backend/utils.go
+++ b/rpc/backend/utils.go
@ -23,10 +23,6 @@ import (
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
 )

-// ExceedBlockGasLimitError defines the error message when tx execution exceeds the block gas limit.
-// The tx fee is deducted in ante handler, so it shouldn't be ignored in JSON-RPC API.
-const ExceedBlockGasLimitError = "out of gas in location: block gas meter; gasWanted:"
-
 type txGasAndReward struct {
 	gasUsed uint64
 	reward  *big.Int
@ -247,17 +243,6 @@ func ParseTxLogsFromEvent(event abci.Event) ([]*ethtypes.Log, error) {
 	return evmtypes.LogsToEthereum(logs), nil
 }

-// TxExceedBlockGasLimit returns true if the tx exceeds block gas limit.
-func TxExceedBlockGasLimit(res *abci.ResponseDeliverTx) bool {
-	return strings.Contains(res.Log, ExceedBlockGasLimitError)
-}
-
-// TxSuccessOrExceedsBlockGasLimit returnsrue if the transaction was successful
-// or if it failed with an ExceedBlockGasLimit error
-func TxSuccessOrExceedsBlockGasLimit(res *abci.ResponseDeliverTx) bool {
-	return res.Code == 0 || TxExceedBlockGasLimit(res)
-}
-
 // ShouldIgnoreGasUsed returns true if the gasUsed in result should be ignored
 // workaround for issue: https://github.com/cosmos/cosmos-sdk/issues/10832
 func ShouldIgnoreGasUsed(res *abci.ResponseDeliverTx) bool {
--- a/rpc/namespaces/ethereum/eth/api.go
+++ b/rpc/namespaces/ethereum/eth/api.go
@ -2,7 +2,6 @@ package eth

 import (
 	"context"
-	"fmt"
 	"math/big"

 	"github.com/ethereum/go-ethereum/signer/core/apitypes"
@ -453,23 +452,19 @@ func (e *PublicAPI) GetTransactionLogs(txHash common.Hash) ([]*ethtypes.Log, err
 		return nil, nil
 	}

-	if res.TxResult.Code != 0 {
+	if res.Failed {
 		// failed, return empty logs
 		return nil, nil
 	}

-	parsedTxs, err := rpctypes.ParseTxResult(&res.TxResult)
+	resBlockResult, err := e.backend.GetTendermintBlockResultByNumber(&res.Height)
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse tx events: %s, %v", hexTx, err)
-	}
-
-	parsedTx := parsedTxs.GetTxByHash(txHash)
-	if parsedTx == nil {
-		return nil, fmt.Errorf("ethereum tx not found in msgs: %s", hexTx)
+		e.logger.Debug("block result not found", "number", res.Height, "error", err.Error())
+		return nil, nil
 	}

 	// parse tx logs from events
-	return parsedTx.ParseTxLogs()
+	return backend.TxLogsFromEvents(resBlockResult.TxsResults[res.TxIndex].Events, int(res.MsgIndex))
 }

 // SignTypedData signs EIP-712 conformant typed data
--- a/rpc/types/events.go
+++ b/rpc/types/events.go
@ -1,13 +1,15 @@
 package types

 import (
-	"encoding/json"
+	"fmt"
 	"strconv"

+	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/ethereum/go-ethereum/common"
-	ethtypes "github.com/ethereum/go-ethereum/core/types"
+	ethermint "github.com/evmos/ethermint/types"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
 	abci "github.com/tendermint/tendermint/abci/types"
+	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
 )

 // EventFormat is the format version of the events.
@ -52,11 +54,9 @@ type ParsedTx struct {

 	Hash common.Hash
 	// -1 means uninitialized
-	EthTxIndex int64
+	EthTxIndex int32
 	GasUsed    uint64
 	Failed     bool
-	// unparsed tx log json strings
-	RawLogs [][]byte
 }

 // NewParsedTx initialize a ParsedTx
@ -64,20 +64,6 @@ func NewParsedTx(msgIndex int) ParsedTx {
 	return ParsedTx{MsgIndex: msgIndex, EthTxIndex: -1}
 }

-// ParseTxLogs decode the raw logs into ethereum format.
-func (p ParsedTx) ParseTxLogs() ([]*ethtypes.Log, error) {
-	logs := make([]*evmtypes.Log, 0, len(p.RawLogs))
-	for _, raw := range p.RawLogs {
-		var log evmtypes.Log
-		if err := json.Unmarshal(raw, &log); err != nil {
-			return nil, err
-		}
-
-		logs = append(logs, &log)
-	}
-	return evmtypes.LogsToEthereum(logs), nil
-}
-
 // ParsedTxs is the tx infos parsed from eth tx events.
 type ParsedTxs struct {
 	// one item per message
@ -88,7 +74,7 @@ type ParsedTxs struct {

 // ParseTxResult parse eth tx infos from cosmos-sdk events.
 // It supports two event formats, the formats are described in the comments of the format constants.
-func ParseTxResult(result *abci.ResponseDeliverTx) (*ParsedTxs, error) {
+func ParseTxResult(result *abci.ResponseDeliverTx, tx sdk.Tx) (*ParsedTxs, error) {
 	format := eventFormatUnknown
 	// the index of current ethereum_tx event in format 1 or the second part of format 2
 	eventIndex := -1
@ -97,40 +83,38 @@ func ParseTxResult(result *abci.ResponseDeliverTx) (*ParsedTxs, error) {
 		TxHashes: make(map[common.Hash]int),
 	}
 	for _, event := range result.Events {
-		switch event.Type {
-		case evmtypes.EventTypeEthereumTx:
-			if format == eventFormatUnknown {
-				// discover the format version by inspect the first ethereum_tx event.
-				if len(event.Attributes) > 2 {
-					format = eventFormat1
-				} else {
-					format = eventFormat2
-				}
-			}
+		if event.Type != evmtypes.EventTypeEthereumTx {
+			continue
+		}

-			if len(event.Attributes) == 2 {
-				// the first part of format 2
+		if format == eventFormatUnknown {
+			// discover the format version by inspect the first ethereum_tx event.
+			if len(event.Attributes) > 2 {
+				format = eventFormat1
+			} else {
+				format = eventFormat2
+			}
+		}
+
+		if len(event.Attributes) == 2 {
+			// the first part of format 2
+			if err := p.newTx(event.Attributes); err != nil {
+				return nil, err
+			}
+		} else {
+			// format 1 or second part of format 2
+			eventIndex++
+			if format == eventFormat1 {
+				// append tx
 				if err := p.newTx(event.Attributes); err != nil {
 					return nil, err
 				}
 			} else {
-				// format 1 or second part of format 2
-				eventIndex++
-				if format == eventFormat1 {
-					// append tx
-					if err := p.newTx(event.Attributes); err != nil {
-						return nil, err
-					}
-				} else {
-					// the second part of format 2, update tx fields
-					if err := p.updateTx(eventIndex, event.Attributes); err != nil {
-						return nil, err
-					}
+				// the second part of format 2, update tx fields
+				if err := p.updateTx(eventIndex, event.Attributes); err != nil {
+					return nil, err
 				}
 			}
-		case evmtypes.EventTypeTxLog:
-			// reuse the eventIndex set by previous ethereum_tx event
-			p.Txs[eventIndex].RawLogs = parseRawLogs(event.Attributes)
 		}
 	}

@ -139,9 +123,42 @@ func ParseTxResult(result *abci.ResponseDeliverTx) (*ParsedTxs, error) {
 		p.Txs[0].GasUsed = uint64(result.GasUsed)
 	}

+	// this could only happen if tx exceeds block gas limit
+	if result.Code != 0 && tx != nil {
+		for i := 0; i < len(p.Txs); i++ {
+			p.Txs[i].Failed = true
+
+			// replace gasUsed with gasLimit because that's what's actually deducted.
+			gasLimit := tx.GetMsgs()[i].(*evmtypes.MsgEthereumTx).GetGas()
+			p.Txs[i].GasUsed = gasLimit
+		}
+	}
 	return p, nil
 }

+// ParseTxIndexerResult parse tm tx result to a format compatible with the custom tx indexer.
+func ParseTxIndexerResult(txResult *tmrpctypes.ResultTx, tx sdk.Tx, getter func(*ParsedTxs) *ParsedTx) (*ethermint.TxResult, error) {
+	txs, err := ParseTxResult(&txResult.TxResult, tx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse tx events: block %d, index %d, %v", txResult.Height, txResult.Index, err)
+	}
+
+	parsedTx := getter(txs)
+	if parsedTx == nil {
+		return nil, fmt.Errorf("ethereum tx not found in msgs: block %d, index %d", txResult.Height, txResult.Index)
+	}
+
+	return &ethermint.TxResult{
+		Height:            txResult.Height,
+		TxIndex:           txResult.Index,
+		MsgIndex:          uint32(parsedTx.MsgIndex),
+		EthTxIndex:        parsedTx.EthTxIndex,
+		Failed:            parsedTx.Failed,
+		GasUsed:           parsedTx.GasUsed,
+		CumulativeGasUsed: txs.AccumulativeGasUsed(parsedTx.MsgIndex),
+	}, nil
+}
+
 // newTx parse a new tx from events, called during parsing.
 func (p *ParsedTxs) newTx(attrs []abci.EventAttribute) error {
 	msgIndex := len(p.Txs)
@ -215,17 +232,17 @@ func fillTxAttribute(tx *ParsedTx, key []byte, value []byte) error {
 	case evmtypes.AttributeKeyEthereumTxHash:
 		tx.Hash = common.HexToHash(string(value))
 	case evmtypes.AttributeKeyTxIndex:
-		txIndex, err := strconv.ParseInt(string(value), 10, 64)
+		txIndex, err := strconv.ParseUint(string(value), 10, 31)
 		if err != nil {
 			return err
 		}
-		tx.EthTxIndex = txIndex
+		tx.EthTxIndex = int32(txIndex)
 	case evmtypes.AttributeKeyTxGasUsed:
-		gasUsed, err := strconv.ParseInt(string(value), 10, 64)
+		gasUsed, err := strconv.ParseUint(string(value), 10, 64)
 		if err != nil {
 			return err
 		}
-		tx.GasUsed = uint64(gasUsed)
+		tx.GasUsed = gasUsed
 	case evmtypes.AttributeKeyEthereumTxFailed:
 		tx.Failed = len(value) > 0
 	}
@ -240,10 +257,3 @@ func fillTxAttributes(tx *ParsedTx, attrs []abci.EventAttribute) error {
 	}
 	return nil
 }
-
-func parseRawLogs(attrs []abci.EventAttribute) (logs [][]byte) {
-	for _, attr := range attrs {
-		logs = append(logs, attr.Value)
-	}
-	return logs
-}
--- a/rpc/types/events_test.go
+++ b/rpc/types/events_test.go
@ -11,11 +11,6 @@ import (
 )

 func TestParseTxResult(t *testing.T) {
-	rawLogs := [][]byte{
-		[]byte("{\"address\":\"0xdcC261c03cD2f33eBea404318Cdc1D9f8b78e1AD\",\"topics\":[\"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef\",\"0x000000000000000000000000569608516a81c0b1247310a3e0cd001046da0663\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANB/GezJGOI=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":5}"),
-		[]byte("{\"address\":\"0x569608516A81C0B1247310A3E0CD001046dA0663\",\"topics\":[\"0xe2403640ba68fed3a2f88b7557551d1993f84b99bb10ff833f0cf8db0c5e0486\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANB/GezJGOI=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":6}"),
-		[]byte("{\"address\":\"0x569608516A81C0B1247310A3E0CD001046dA0663\",\"topics\":[\"0xf279e6a1f5e320cca91135676d9cb6e44ca8a08c0b88342bcdb1144f6511b568\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\",\"0x0000000000000000000000000000000000000000000000000000000000000001\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":7}"),
-	}
 	address := "0x57f96e6B86CdeFdB3d412547816a82E3E0EbF9D2"
 	txHash := common.BigToHash(big.NewInt(1))
 	txHash2 := common.BigToHash(big.NewInt(2))
@ -46,11 +41,6 @@ func TestParseTxResult(t *testing.T) {
 						{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
 						{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
 					}},
-					{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[0]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[1]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[2]},
-					}},
 					{Type: "message", Attributes: []abci.EventAttribute{
 						{Key: []byte("action"), Value: []byte("/ethermint.evm.v1.MsgEthereumTx")},
 						{Key: []byte("key"), Value: []byte("ethm17xpfvakm2amg962yls6f84z3kell8c5lthdzgl")},
@ -76,7 +66,6 @@ func TestParseTxResult(t *testing.T) {
 					EthTxIndex: 10,
 					GasUsed:    21000,
 					Failed:     false,
-					RawLogs:    rawLogs,
 				},
 				{
 					MsgIndex:   1,
@ -84,7 +73,6 @@ func TestParseTxResult(t *testing.T) {
 					EthTxIndex: 11,
 					GasUsed:    21000,
 					Failed:     true,
-					RawLogs:    nil,
 				},
 			},
 		},
@ -113,11 +101,6 @@ func TestParseTxResult(t *testing.T) {
 						{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
 						{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
 					}},
-					{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[0]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[1]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[2]},
-					}},
 					{Type: "message", Attributes: []abci.EventAttribute{
 						{Key: []byte("action"), Value: []byte("/ethermint.evm.v1.MsgEthereumTx")},
 						{Key: []byte("key"), Value: []byte("ethm17xpfvakm2amg962yls6f84z3kell8c5lthdzgl")},
@ -133,7 +116,6 @@ func TestParseTxResult(t *testing.T) {
 					EthTxIndex: 0,
 					GasUsed:    21000,
 					Failed:     false,
-					RawLogs:    rawLogs,
 				},
 			},
 		},
@ -150,11 +132,6 @@ func TestParseTxResult(t *testing.T) {
 						{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
 						{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
 					}},
-					{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[0]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[1]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[2]},
-					}},
 					{Type: evmtypes.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
 						{Key: []byte("ethereumTxHash"), Value: []byte(txHash2.Hex())},
 						{Key: []byte("txIndex"), Value: []byte("0x01")},
@ -182,11 +159,6 @@ func TestParseTxResult(t *testing.T) {
 						{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
 						{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
 					}},
-					{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[0]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[1]},
-						{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[2]},
-					}},
 					{Type: evmtypes.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
 						{Key: []byte("ethereumTxHash"), Value: []byte(txHash2.Hex())},
 						{Key: []byte("txIndex"), Value: []byte("10")},
@ -243,7 +215,7 @@ func TestParseTxResult(t *testing.T) {

 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			parsed, err := ParseTxResult(&tc.response)
+			parsed, err := ParseTxResult(&tc.response, nil)
 			if tc.expTxs == nil {
 				require.Error(t, err)
 			} else {
@ -252,8 +224,6 @@ func TestParseTxResult(t *testing.T) {
 					require.Equal(t, expTx, parsed.GetTxByMsgIndex(msgIndex))
 					require.Equal(t, expTx, parsed.GetTxByHash(expTx.Hash))
 					require.Equal(t, expTx, parsed.GetTxByTxIndex(int(expTx.EthTxIndex)))
-					_, err := expTx.ParseTxLogs()
-					require.NoError(t, err)
 				}
 				// non-exists tx hash
 				require.Nil(t, parsed.GetTxByHash(common.Hash{}))
@ -264,66 +234,3 @@ func TestParseTxResult(t *testing.T) {
 		})
 	}
 }
-
-func TestParseTxLogs(t *testing.T) {
-	rawLogs := [][]byte{
-		[]byte("{\"address\":\"0xdcC261c03cD2f33eBea404318Cdc1D9f8b78e1AD\",\"topics\":[\"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef\",\"0x000000000000000000000000569608516a81c0b1247310a3e0cd001046da0663\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANB/GezJGOI=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":5}"),
-		[]byte("{\"address\":\"0x569608516A81C0B1247310A3E0CD001046dA0663\",\"topics\":[\"0xe2403640ba68fed3a2f88b7557551d1993f84b99bb10ff833f0cf8db0c5e0486\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANB/GezJGOI=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":6}"),
-		[]byte("{\"address\":\"0x569608516A81C0B1247310A3E0CD001046dA0663\",\"topics\":[\"0xf279e6a1f5e320cca91135676d9cb6e44ca8a08c0b88342bcdb1144f6511b568\",\"0x0000000000000000000000002eea2c1ae0cdd2622381c2f9201b2a07c037b1f6\",\"0x0000000000000000000000000000000000000000000000000000000000000001\"],\"data\":\"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=\",\"blockNumber\":1803258,\"transactionHash\":\"0xcf4354b55b9ac77436cf8b2f5c229ad3b3119b5196cd79ac5c6c382d9f7b0a71\",\"transactionIndex\":1,\"blockHash\":\"0xa69a510b0848180a094904ea9ae3f0ca2216029470c8e03e6941b402aba610d8\",\"logIndex\":7}"),
-	}
-	address := "0x57f96e6B86CdeFdB3d412547816a82E3E0EbF9D2"
-	txHash := common.BigToHash(big.NewInt(1))
-	txHash2 := common.BigToHash(big.NewInt(2))
-	response := abci.ResponseDeliverTx{
-		GasUsed: 21000,
-		Events: []abci.Event{
-			{Type: "coin_received", Attributes: []abci.EventAttribute{
-				{Key: []byte("receiver"), Value: []byte("ethm12luku6uxehhak02py4rcz65zu0swh7wjun6msa")},
-				{Key: []byte("amount"), Value: []byte("1252860basetcro")},
-			}},
-			{Type: "coin_spent", Attributes: []abci.EventAttribute{
-				{Key: []byte("spender"), Value: []byte("ethm17xpfvakm2amg962yls6f84z3kell8c5lthdzgl")},
-				{Key: []byte("amount"), Value: []byte("1252860basetcro")},
-			}},
-			{Type: evmtypes.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
-				{Key: []byte("ethereumTxHash"), Value: []byte(txHash.Hex())},
-				{Key: []byte("txIndex"), Value: []byte("10")},
-				{Key: []byte("amount"), Value: []byte("1000")},
-				{Key: []byte("txGasUsed"), Value: []byte("21000")},
-				{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
-				{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
-			}},
-			{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{
-				{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[0]},
-				{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[1]},
-				{Key: []byte(evmtypes.AttributeKeyTxLog), Value: rawLogs[2]},
-			}},
-			{Type: "message", Attributes: []abci.EventAttribute{
-				{Key: []byte("action"), Value: []byte("/ethermint.evm.v1.MsgEthereumTx")},
-				{Key: []byte("key"), Value: []byte("ethm17xpfvakm2amg962yls6f84z3kell8c5lthdzgl")},
-				{Key: []byte("module"), Value: []byte("evm")},
-				{Key: []byte("sender"), Value: []byte(address)},
-			}},
-			{Type: evmtypes.EventTypeEthereumTx, Attributes: []abci.EventAttribute{
-				{Key: []byte("ethereumTxHash"), Value: []byte(txHash2.Hex())},
-				{Key: []byte("txIndex"), Value: []byte("11")},
-				{Key: []byte("amount"), Value: []byte("1000")},
-				{Key: []byte("txGasUsed"), Value: []byte("21000")},
-				{Key: []byte("txHash"), Value: []byte("14A84ED06282645EFBF080E0B7ED80D8D8D6A36337668A12B5F229F81CDD3F57")},
-				{Key: []byte("recipient"), Value: []byte("0x775b87ef5D82ca211811C1a02CE0fE0CA3a455d7")},
-				{Key: []byte("ethereumTxFailed"), Value: []byte("contract reverted")},
-			}},
-			{Type: evmtypes.EventTypeTxLog, Attributes: []abci.EventAttribute{}},
-		},
-	}
-	parsed, err := ParseTxResult(&response)
-	require.NoError(t, err)
-	tx1 := parsed.GetTxByMsgIndex(0)
-	txLogs1, err := tx1.ParseTxLogs()
-	require.NoError(t, err)
-	require.NotEmpty(t, txLogs1)
-
-	tx2 := parsed.GetTxByMsgIndex(1)
-	txLogs2, err := tx2.ParseTxLogs()
-	require.Empty(t, txLogs2)
-}
--- a/rpc/types/utils.go
+++ b/rpc/types/utils.go
@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"math/big"
+	"strings"

 	abci "github.com/tendermint/tendermint/abci/types"
 	tmtypes "github.com/tendermint/tendermint/types"
@ -22,6 +23,10 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 )

+// ExceedBlockGasLimitError defines the error message when tx execution exceeds the block gas limit.
+// The tx fee is deducted in ante handler, so it shouldn't be ignored in JSON-RPC API.
+const ExceedBlockGasLimitError = "out of gas in location: block gas meter; gasWanted:"
+
 // RawTxToEthTx returns a evm MsgEthereum transaction from raw tx bytes.
 func RawTxToEthTx(clientCtx client.Context, txBz tmtypes.Tx) ([]*evmtypes.MsgEthereumTx, error) {
 	tx, err := clientCtx.TxConfig.TxDecoder()(txBz)
@ -243,3 +248,14 @@ func CheckTxFee(gasPrice *big.Int, gas uint64, cap float64) error {
 	}
 	return nil
 }
+
+// TxExceedBlockGasLimit returns true if the tx exceeds block gas limit.
+func TxExceedBlockGasLimit(res *abci.ResponseDeliverTx) bool {
+	return strings.Contains(res.Log, ExceedBlockGasLimitError)
+}
+
+// TxSuccessOrExceedsBlockGasLimit returnsrue if the transaction was successful
+// or if it failed with an ExceedBlockGasLimit error
+func TxSuccessOrExceedsBlockGasLimit(res *abci.ResponseDeliverTx) bool {
+	return res.Code == 0 || TxExceedBlockGasLimit(res)
+}
--- a/server/config/config.go
+++ b/server/config/config.go
@ -108,6 +108,8 @@ type JSONRPCConfig struct {
 	// MaxOpenConnections sets the maximum number of simultaneous connections
 	// for the server listener.
 	MaxOpenConnections int `mapstructure:"max-open-connections"`
+	// EnableIndexer defines if enable the custom indexer service.
+	EnableIndexer bool `mapstructure:"enable-indexer"`
 }

 // TLSConfig defines the certificate and matching private key for the server.
@ -208,6 +210,7 @@ func DefaultJSONRPCConfig() *JSONRPCConfig {
 		HTTPIdleTimeout:     DefaultHTTPIdleTimeout,
 		AllowUnprotectedTxs: DefaultAllowUnprotectedTxs,
 		MaxOpenConnections:  DefaultMaxOpenConnections,
+		EnableIndexer:       false,
 	}
 }

@ -312,6 +315,7 @@ func GetConfig(v *viper.Viper) Config {
 			HTTPTimeout:        v.GetDuration("json-rpc.http-timeout"),
 			HTTPIdleTimeout:    v.GetDuration("json-rpc.http-idle-timeout"),
 			MaxOpenConnections: v.GetInt("json-rpc.max-open-connections"),
+			EnableIndexer:      v.GetBool("json-rpc.enable-indexer"),
 		},
 		TLS: TLSConfig{
 			CertificatePath: v.GetString("tls.certificate-path"),
--- a/server/config/toml.go
+++ b/server/config/toml.go
@ -70,6 +70,9 @@ allow-unprotected-txs = {{ .JSONRPC.AllowUnprotectedTxs }}
 # for the server listener.
 max-open-connections = {{ .JSONRPC.MaxOpenConnections }}

+# EnableIndexer enables the custom transaction indexer for the EVM (ethereum transactions).
+enable-indexer = {{ .JSONRPC.EnableIndexer }}
+
 ###############################################################################
 ###                             TLS Configuration                           ###
 ###############################################################################
--- a/server/flags/flags.go
+++ b/server/flags/flags.go
@ -48,6 +48,7 @@ const (
 	JSONRPCHTTPIdleTimeout     = "json-rpc.http-idle-timeout"
 	JSONRPCAllowUnprotectedTxs = "json-rpc.allow-unprotected-txs"
 	JSONRPCMaxOpenConnections  = "json-rpc.max-open-connections"
+	JSONRPCEnableIndexer       = "json-rpc.enable-indexer"
 )

 // EVM flags
--- a/server/indexer_cmd.go
+++ b/server/indexer_cmd.go
@ -0,0 +1,112 @@
+package server
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/server"
+	"github.com/evmos/ethermint/indexer"
+	tmnode "github.com/tendermint/tendermint/node"
+	sm "github.com/tendermint/tendermint/state"
+	tmstore "github.com/tendermint/tendermint/store"
+)
+
+func NewIndexTxCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "index-eth-tx [forward|backward]",
+		Short: "Index historical eth txs",
+		Long: `Index historical eth txs, it only support two traverse direction to avoid creating gaps in the indexer db if using arbitrary block ranges:
+		- backward: index the blocks from the first indexed block to the earliest block in the chain.
+		- forward: index the blocks from the latest indexed block to latest block in the chain.
+		`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			serverCtx := server.GetServerContextFromCmd(cmd)
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+
+			direction := args[0]
+			if direction != "backward" && direction != "forward" {
+				return fmt.Errorf("unknown index direction, expect: backward|forward, got: %s", direction)
+			}
+
+			cfg := serverCtx.Config
+			home := cfg.RootDir
+			logger := serverCtx.Logger
+			idxDB, err := OpenIndexerDB(home, server.GetAppDBBackend(serverCtx.Viper))
+			if err != nil {
+				logger.Error("failed to open evm indexer DB", "error", err.Error())
+				return err
+			}
+			idxer := indexer.NewKVIndexer(idxDB, logger.With("module", "evmindex"), clientCtx)
+
+			// open local tendermint db, because the local rpc won't be available.
+			tmdb, err := tmnode.DefaultDBProvider(&tmnode.DBContext{ID: "blockstore", Config: cfg})
+			if err != nil {
+				return err
+			}
+			blockStore := tmstore.NewBlockStore(tmdb)
+
+			stateDB, err := tmnode.DefaultDBProvider(&tmnode.DBContext{ID: "state", Config: cfg})
+			if err != nil {
+				return err
+			}
+			stateStore := sm.NewStore(stateDB)
+
+			indexBlock := func(height int64) error {
+				blk := blockStore.LoadBlock(height)
+				if blk == nil {
+					return fmt.Errorf("block not found %d", height)
+				}
+				resBlk, err := stateStore.LoadABCIResponses(height)
+				if err != nil {
+					return err
+				}
+				if err := idxer.IndexBlock(blk, resBlk.DeliverTxs); err != nil {
+					return err
+				}
+				fmt.Println(height)
+				return nil
+			}
+
+			switch args[0] {
+			case "backward":
+				first, err := idxer.FirstIndexedBlock()
+				if err != nil {
+					return err
+				}
+				if first == -1 {
+					return fmt.Errorf("indexer db is empty")
+				}
+				for i := first - 1; i > 0; i-- {
+					if err := indexBlock(i); err != nil {
+						return err
+					}
+				}
+			case "forward":
+				latest, err := idxer.LastIndexedBlock()
+				if err != nil {
+					return err
+				}
+				if latest == -1 {
+					// start from genesis if empty
+					latest = 0
+				}
+				for i := latest + 1; i <= blockStore.Height(); i++ {
+					if err := indexBlock(i); err != nil {
+						return err
+					}
+				}
+			default:
+				return fmt.Errorf("unknown direction %s", args[0])
+			}
+
+			return nil
+		},
+	}
+	return cmd
+}
--- a/server/indexer_service.go
+++ b/server/indexer_service.go
@ -0,0 +1,109 @@
+package server
+
+import (
+	"context"
+	"time"
+
+	"github.com/tendermint/tendermint/libs/service"
+	rpcclient "github.com/tendermint/tendermint/rpc/client"
+	"github.com/tendermint/tendermint/types"
+
+	ethermint "github.com/evmos/ethermint/types"
+)
+
+const (
+	ServiceName = "EVMIndexerService"
+
+	NewBlockWaitTimeout = 60 * time.Second
+)
+
+// EVMIndexerService indexes transactions for json-rpc service.
+type EVMIndexerService struct {
+	service.BaseService
+
+	txIdxr ethermint.EVMTxIndexer
+	client rpcclient.Client
+}
+
+// NewEVMIndexerService returns a new service instance.
+func NewEVMIndexerService(
+	txIdxr ethermint.EVMTxIndexer,
+	client rpcclient.Client,
+) *EVMIndexerService {
+	is := &EVMIndexerService{txIdxr: txIdxr, client: client}
+	is.BaseService = *service.NewBaseService(nil, ServiceName, is)
+	return is
+}
+
+// OnStart implements service.Service by subscribing for new blocks
+// and indexing them by events.
+func (eis *EVMIndexerService) OnStart() error {
+	ctx := context.Background()
+	status, err := eis.client.Status(ctx)
+	if err != nil {
+		return err
+	}
+	latestBlock := status.SyncInfo.LatestBlockHeight
+	newBlockSignal := make(chan struct{}, 1)
+
+	// Use SubscribeUnbuffered here to ensure both subscriptions does not get
+	// canceled due to not pulling messages fast enough. Cause this might
+	// sometimes happen when there are no other subscribers.
+	blockHeadersChan, err := eis.client.Subscribe(
+		ctx,
+		ServiceName,
+		types.QueryForEvent(types.EventNewBlockHeader).String(),
+		0)
+	if err != nil {
+		return err
+	}
+
+	go func() {
+		for {
+			msg := <-blockHeadersChan
+			eventDataHeader := msg.Data.(types.EventDataNewBlockHeader)
+			if eventDataHeader.Header.Height > latestBlock {
+				latestBlock = eventDataHeader.Header.Height
+				// notify
+				select {
+				case newBlockSignal <- struct{}{}:
+				default:
+				}
+			}
+		}
+	}()
+
+	lastBlock, err := eis.txIdxr.LastIndexedBlock()
+	if err != nil {
+		return err
+	}
+	if lastBlock == -1 {
+		lastBlock = latestBlock
+	}
+	for {
+		if latestBlock <= lastBlock {
+			// nothing to index. wait for signal of new block
+			select {
+			case <-newBlockSignal:
+			case <-time.After(NewBlockWaitTimeout):
+			}
+			continue
+		}
+		for i := lastBlock + 1; i <= latestBlock; i++ {
+			block, err := eis.client.Block(ctx, &i)
+			if err != nil {
+				eis.Logger.Error("failed to fetch block", "height", i, "err", err)
+				break
+			}
+			blockResult, err := eis.client.BlockResults(ctx, &i)
+			if err != nil {
+				eis.Logger.Error("failed to fetch block result", "height", i, "err", err)
+				break
+			}
+			if err := eis.txIdxr.IndexBlock(block.Block, blockResult.TxsResults); err != nil {
+				eis.Logger.Error("failed to index block", "height", i, "err", err)
+			}
+			lastBlock = blockResult.Height
+		}
+	}
+}
--- a/server/json_rpc.go
+++ b/server/json_rpc.go
@ -15,10 +15,11 @@ import (
 	"github.com/evmos/ethermint/rpc"

 	"github.com/evmos/ethermint/server/config"
+	ethermint "github.com/evmos/ethermint/types"
 )

 // StartJSONRPC starts the JSON-RPC server
-func StartJSONRPC(ctx *server.Context, clientCtx client.Context, tmRPCAddr, tmEndpoint string, config *config.Config) (*http.Server, chan struct{}, error) {
+func StartJSONRPC(ctx *server.Context, clientCtx client.Context, tmRPCAddr, tmEndpoint string, config *config.Config, indexer ethermint.EVMTxIndexer) (*http.Server, chan struct{}, error) {
 	tmWsClient := ConnectTmWS(tmRPCAddr, tmEndpoint, ctx.Logger)

 	logger := ctx.Logger.With("module", "geth")
@ -39,7 +40,7 @@ func StartJSONRPC(ctx *server.Context, clientCtx client.Context, tmRPCAddr, tmEn
 	allowUnprotectedTxs := config.JSONRPC.AllowUnprotectedTxs
 	rpcAPIArr := config.JSONRPC.API

-	apis := rpc.GetRPCAPIs(ctx, clientCtx, tmWsClient, allowUnprotectedTxs, rpcAPIArr)
+	apis := rpc.GetRPCAPIs(ctx, clientCtx, tmWsClient, allowUnprotectedTxs, indexer, rpcAPIArr)

 	for _, api := range apis {
 		if err := rpcServer.RegisterName(api.Namespace, api.Service); err != nil {
--- a/server/start.go
+++ b/server/start.go
@ -40,9 +40,11 @@ import (
 	servergrpc "github.com/cosmos/cosmos-sdk/server/grpc"
 	"github.com/cosmos/cosmos-sdk/server/types"

+	"github.com/evmos/ethermint/indexer"
 	ethdebug "github.com/evmos/ethermint/rpc/namespaces/ethereum/debug"
 	"github.com/evmos/ethermint/server/config"
 	srvflags "github.com/evmos/ethermint/server/flags"
+	ethermint "github.com/evmos/ethermint/types"
 )

 // StartCmd runs the service passed in, either stand-alone or in-process with
@ -165,6 +167,7 @@ which accepts a path for the resulting pprof file.
 	cmd.Flags().Int32(srvflags.JSONRPCLogsCap, config.DefaultLogsCap, "Sets the max number of results can be returned from single `eth_getLogs` query")
 	cmd.Flags().Int32(srvflags.JSONRPCBlockRangeCap, config.DefaultBlockRangeCap, "Sets the max block range allowed for `eth_getLogs` query")
 	cmd.Flags().Int(srvflags.JSONRPCMaxOpenConnections, config.DefaultMaxOpenConnections, "Sets the maximum number of simultaneous connections for the server listener")
+	cmd.Flags().Bool(srvflags.JSONRPCEnableIndexer, false, "Enable the custom tx indexer for json-rpc")

 	cmd.Flags().String(srvflags.EVMTracer, config.DefaultEVMTracer, "the EVM tracer type to collect execution traces from the EVM transaction execution (json|struct|access_list|markdown)")
 	cmd.Flags().Uint64(srvflags.EVMMaxTxGasWanted, config.DefaultMaxTxGasWanted, "the gas wanted for each eth tx returned in ante handler in check tx mode")
@ -323,13 +326,39 @@ func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator ty
 	// Add the tx service to the gRPC router. We only need to register this
 	// service if API or gRPC or JSONRPC is enabled, and avoid doing so in the general
 	// case, because it spawns a new local tendermint RPC client.
-	if config.API.Enable || config.GRPC.Enable || config.JSONRPC.Enable {
+	if config.API.Enable || config.GRPC.Enable || config.JSONRPC.Enable || config.JSONRPC.EnableIndexer {
 		clientCtx = clientCtx.WithClient(local.New(tmNode))

 		app.RegisterTxService(clientCtx)
 		app.RegisterTendermintService(clientCtx)
 	}

+	var idxer ethermint.EVMTxIndexer
+	if config.JSONRPC.EnableIndexer {
+		idxDB, err := OpenIndexerDB(home, server.GetAppDBBackend(ctx.Viper))
+		if err != nil {
+			logger.Error("failed to open evm indexer DB", "error", err.Error())
+			return err
+		}
+		idxLogger := ctx.Logger.With("module", "evmindex")
+		idxer = indexer.NewKVIndexer(idxDB, idxLogger, clientCtx)
+		indexerService := NewEVMIndexerService(idxer, clientCtx.Client)
+		indexerService.SetLogger(idxLogger)
+
+		errCh := make(chan error)
+		go func() {
+			if err := indexerService.Start(); err != nil {
+				errCh <- err
+			}
+		}()
+
+		select {
+		case err := <-errCh:
+			return err
+		case <-time.After(types.ServerStartTime): // assume server started successfully
+		}
+	}
+
 	var apiSrv *api.Server
 	if config.API.Enable {
 		genDoc, err := genDocProvider()
@ -427,7 +456,7 @@ func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator ty

 		tmEndpoint := "/websocket"
 		tmRPCAddr := cfg.RPC.ListenAddress
-		httpSrv, httpSrvDone, err = StartJSONRPC(ctx, clientCtx, tmRPCAddr, tmEndpoint, &config)
+		httpSrv, httpSrvDone, err = StartJSONRPC(ctx, clientCtx, tmRPCAddr, tmEndpoint, &config, idxer)
 		if err != nil {
 			return err
 		}
@ -482,6 +511,12 @@ func openDB(rootDir string, backendType dbm.BackendType) (dbm.DB, error) {
 	return dbm.NewDB("application", backendType, dataDir)
 }

+// OpenIndexerDB opens the custom eth indexer db, using the same db backend as the main app
+func OpenIndexerDB(rootDir string, backendType dbm.BackendType) (dbm.DB, error) {
+	dataDir := filepath.Join(rootDir, "data")
+	return dbm.NewDB("evmindexer", backendType, dataDir)
+}
+
 func openTraceWriter(traceWriterFile string) (w io.Writer, err error) {
 	if traceWriterFile == "" {
 		return
--- a/server/util.go
+++ b/server/util.go
@ -45,6 +45,9 @@ func AddCommands(rootCmd *cobra.Command, defaultNodeHome string, appCreator type
 		sdkserver.ExportCmd(appExport, defaultNodeHome),
 		version.NewVersionCommand(),
 		sdkserver.NewRollbackCmd(defaultNodeHome),
+
+		// custom tx indexer command
+		NewIndexTxCmd(),
 	)
 }

--- a/tests/integration_tests/configs/enable-indexer.jsonnet
+++ b/tests/integration_tests/configs/enable-indexer.jsonnet
@ -0,0 +1,20 @@
+local config = import 'default.jsonnet';
+
+config {
+  'ethermint_9000-1'+: {
+    config+: {
+      tx_index+: {
+        indexer: 'null',
+      },
+    },
+    'app-config'+: {
+      pruning: 'everything',
+      'state-sync'+: {
+        'snapshot-interval': 0,
+      },
+      'json-rpc'+: {
+        'enable-indexer': true,
+      },
+    },
+  },
+}
--- a/tests/integration_tests/conftest.py
+++ b/tests/integration_tests/conftest.py
@ -1,6 +1,8 @@
+from pathlib import Path
+
 import pytest

-from .network import setup_ethermint, setup_geth
+from .network import setup_custom_ethermint, setup_ethermint, setup_geth


@pytest.fixture(scope="session")
@ -9,14 +11,24 @@ def ethermint(tmp_path_factory):
    yield from setup_ethermint(path, 26650)


+@pytest.fixture(scope="session")
+def ethermint_indexer(tmp_path_factory):
+    path = tmp_path_factory.mktemp("indexer")
+    yield from setup_custom_ethermint(
+        path, 26660, Path(__file__).parent / "configs/enable-indexer.jsonnet"
+    )
+
+
@pytest.fixture(scope="session")
 def geth(tmp_path_factory):
    path = tmp_path_factory.mktemp("geth")
    yield from setup_geth(path, 8545)


-@pytest.fixture(scope="session", params=["ethermint", "geth", "ethermint-ws"])
-def cluster(request, ethermint, geth):
+@pytest.fixture(
+    scope="session", params=["ethermint", "geth", "ethermint-ws", "enable-indexer"]
+)
+def cluster(request, ethermint, ethermint_indexer, geth):
    """
    run on both ethermint and geth
    """
@ -29,5 +41,7 @@ def cluster(request, ethermint, geth):
        ethermint_ws = ethermint.copy()
        ethermint_ws.use_websocket()
        yield ethermint_ws
+    elif provider == "enable-indexer":
+        yield ethermint_indexer
    else:
        raise NotImplementedError
--- a/testutil/network/util.go
+++ b/testutil/network/util.go
@ -131,7 +131,7 @@ func startInProcess(cfg Config, val *Validator) error {
 		tmEndpoint := "/websocket"
 		tmRPCAddr := val.RPCAddress

-		val.jsonrpc, val.jsonrpcDone, err = server.StartJSONRPC(val.Ctx, val.ClientCtx, tmRPCAddr, tmEndpoint, val.AppConfig)
+		val.jsonrpc, val.jsonrpcDone, err = server.StartJSONRPC(val.Ctx, val.ClientCtx, tmRPCAddr, tmEndpoint, val.AppConfig, nil)
 		if err != nil {
 			return err
 		}
--- a/types/indexer.go
+++ b/types/indexer.go
@ -0,0 +1,19 @@
+package types
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	abci "github.com/tendermint/tendermint/abci/types"
+	tmtypes "github.com/tendermint/tendermint/types"
+)
+
+// EVMTxIndexer defines the interface of custom eth tx indexer.
+type EVMTxIndexer interface {
+	// LastIndexedBlock returns -1 if indexer db is empty
+	LastIndexedBlock() (int64, error)
+	IndexBlock(*tmtypes.Block, []*abci.ResponseDeliverTx) error
+
+	// GetByTxHash returns nil if tx not found.
+	GetByTxHash(common.Hash) (*TxResult, error)
+	// GetByBlockAndIndex returns nil if tx not found.
+	GetByBlockAndIndex(int64, int32) (*TxResult, error)
+}
--- a/types/indexer.pb.go
+++ b/types/indexer.pb.go
@ -0,0 +1,485 @@
+// Code generated by protoc-gen-gogo. DO NOT EDIT.
+// source: ethermint/types/v1/indexer.proto
+
+package types
+
+import (
+	fmt "fmt"
+	_ "github.com/gogo/protobuf/gogoproto"
+	proto "github.com/gogo/protobuf/proto"
+	io "io"
+	math "math"
+	math_bits "math/bits"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
+
+// TxResult is the value stored in eth tx indexer
+type TxResult struct {
+	// the block height
+	Height int64 `protobuf:"varint,1,opt,name=height,proto3" json:"height,omitempty"`
+	// cosmos tx index
+	TxIndex uint32 `protobuf:"varint,2,opt,name=tx_index,json=txIndex,proto3" json:"tx_index,omitempty"`
+	// the msg index in a batch tx
+	MsgIndex uint32 `protobuf:"varint,3,opt,name=msg_index,json=msgIndex,proto3" json:"msg_index,omitempty"`
+	// eth tx index, the index in the list of valid eth tx in the block,
+	// aka. the transaction list returned by eth_getBlock api.
+	EthTxIndex int32 `protobuf:"varint,4,opt,name=eth_tx_index,json=ethTxIndex,proto3" json:"eth_tx_index,omitempty"`
+	// if the eth tx is failed
+	Failed bool `protobuf:"varint,5,opt,name=failed,proto3" json:"failed,omitempty"`
+	// gas used by tx, if exceeds block gas limit,
+	// it's set to gas limit which is what's actually deducted by ante handler.
+	GasUsed uint64 `protobuf:"varint,6,opt,name=gas_used,json=gasUsed,proto3" json:"gas_used,omitempty"`
+	// the cumulative gas used within current batch tx
+	CumulativeGasUsed uint64 `protobuf:"varint,7,opt,name=cumulative_gas_used,json=cumulativeGasUsed,proto3" json:"cumulative_gas_used,omitempty"`
+}
+
+func (m *TxResult) Reset()         { *m = TxResult{} }
+func (m *TxResult) String() string { return proto.CompactTextString(m) }
+func (*TxResult) ProtoMessage()    {}
+func (*TxResult) Descriptor() ([]byte, []int) {
+	return fileDescriptor_1197e10a8be8ed28, []int{0}
+}
+func (m *TxResult) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *TxResult) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_TxResult.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *TxResult) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TxResult.Merge(m, src)
+}
+func (m *TxResult) XXX_Size() int {
+	return m.Size()
+}
+func (m *TxResult) XXX_DiscardUnknown() {
+	xxx_messageInfo_TxResult.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TxResult proto.InternalMessageInfo
+
+func init() {
+	proto.RegisterType((*TxResult)(nil), "ethermint.types.v1.TxResult")
+}
+
+func init() { proto.RegisterFile("ethermint/types/v1/indexer.proto", fileDescriptor_1197e10a8be8ed28) }
+
+var fileDescriptor_1197e10a8be8ed28 = []byte{
+	// 295 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x5c, 0x90, 0x31, 0x4b, 0xc3, 0x40,
+	0x18, 0x86, 0x73, 0xb6, 0x4d, 0xe3, 0xa1, 0x83, 0x51, 0x4a, 0x54, 0x88, 0x87, 0x53, 0xa6, 0x84,
+	0xe2, 0xd6, 0xd1, 0x45, 0x5c, 0x8f, 0xba, 0xb8, 0x84, 0xb4, 0xf9, 0xbc, 0x3b, 0xe8, 0xf5, 0x4a,
+	0xef, 0x4b, 0x88, 0xff, 0xc0, 0xd1, 0x9f, 0xe0, 0xcf, 0x71, 0xec, 0xe8, 0x28, 0x2d, 0xfe, 0x0f,
+	0xe9, 0x35, 0x44, 0x70, 0xfb, 0x5e, 0x9e, 0xe7, 0xe3, 0x85, 0x97, 0x32, 0x40, 0x09, 0x6b, 0xad,
+	0x96, 0x98, 0xe1, 0xeb, 0x0a, 0x6c, 0x56, 0x8f, 0x33, 0xb5, 0x2c, 0xa1, 0x81, 0x75, 0xba, 0x5a,
+	0x1b, 0x34, 0x61, 0xd8, 0x19, 0xa9, 0x33, 0xd2, 0x7a, 0x7c, 0x75, 0x21, 0x8c, 0x30, 0x0e, 0x67,
+	0xfb, 0xeb, 0x60, 0xde, 0xfe, 0x10, 0x1a, 0x4c, 0x1b, 0x0e, 0xb6, 0x5a, 0x60, 0x38, 0xa2, 0xbe,
+	0x04, 0x25, 0x24, 0x46, 0x84, 0x91, 0xa4, 0xc7, 0xdb, 0x14, 0x5e, 0xd2, 0x00, 0x9b, 0xdc, 0x55,
+	0x44, 0x47, 0x8c, 0x24, 0xa7, 0x7c, 0x88, 0xcd, 0xe3, 0x3e, 0x86, 0xd7, 0xf4, 0x58, 0x5b, 0xd1,
+	0xb2, 0x9e, 0x63, 0x81, 0xb6, 0xe2, 0x00, 0x19, 0x3d, 0x01, 0x94, 0x79, 0xf7, 0xdb, 0x67, 0x24,
+	0x19, 0x70, 0x0a, 0x28, 0xa7, 0xed, 0xfb, 0x88, 0xfa, 0x2f, 0x85, 0x5a, 0x40, 0x19, 0x0d, 0x18,
+	0x49, 0x02, 0xde, 0xa6, 0x7d, 0xa3, 0x28, 0x6c, 0x5e, 0x59, 0x28, 0x23, 0x9f, 0x91, 0xa4, 0xcf,
+	0x87, 0xa2, 0xb0, 0x4f, 0x16, 0xca, 0x30, 0xa5, 0xe7, 0xf3, 0x4a, 0x57, 0x8b, 0x02, 0x55, 0x0d,
+	0x79, 0x67, 0x0d, 0x9d, 0x75, 0xf6, 0x87, 0x1e, 0x0e, 0xfe, 0xa4, 0xff, 0xf6, 0x71, 0xe3, 0xdd,
+	0x4f, 0x3e, 0xb7, 0x31, 0xd9, 0x6c, 0x63, 0xf2, 0xbd, 0x8d, 0xc9, 0xfb, 0x2e, 0xf6, 0x36, 0xbb,
+	0xd8, 0xfb, 0xda, 0xc5, 0xde, 0x33, 0x13, 0x0a, 0x65, 0x35, 0x4b, 0xe7, 0x46, 0x67, 0x50, 0x6b,
+	0x63, 0xb3, 0x7f, 0xf3, 0xce, 0x7c, 0x37, 0xd5, 0xdd, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xc1,
+	0x34, 0xa8, 0x0b, 0x78, 0x01, 0x00, 0x00,
+}
+
+func (m *TxResult) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *TxResult) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *TxResult) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.CumulativeGasUsed != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.CumulativeGasUsed))
+		i--
+		dAtA[i] = 0x38
+	}
+	if m.GasUsed != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.GasUsed))
+		i--
+		dAtA[i] = 0x30
+	}
+	if m.Failed {
+		i--
+		if m.Failed {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x28
+	}
+	if m.EthTxIndex != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.EthTxIndex))
+		i--
+		dAtA[i] = 0x20
+	}
+	if m.MsgIndex != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.MsgIndex))
+		i--
+		dAtA[i] = 0x18
+	}
+	if m.TxIndex != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.TxIndex))
+		i--
+		dAtA[i] = 0x10
+	}
+	if m.Height != 0 {
+		i = encodeVarintIndexer(dAtA, i, uint64(m.Height))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
+func encodeVarintIndexer(dAtA []byte, offset int, v uint64) int {
+	offset -= sovIndexer(v)
+	base := offset
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return base
+}
+func (m *TxResult) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.Height != 0 {
+		n += 1 + sovIndexer(uint64(m.Height))
+	}
+	if m.TxIndex != 0 {
+		n += 1 + sovIndexer(uint64(m.TxIndex))
+	}
+	if m.MsgIndex != 0 {
+		n += 1 + sovIndexer(uint64(m.MsgIndex))
+	}
+	if m.EthTxIndex != 0 {
+		n += 1 + sovIndexer(uint64(m.EthTxIndex))
+	}
+	if m.Failed {
+		n += 2
+	}
+	if m.GasUsed != 0 {
+		n += 1 + sovIndexer(uint64(m.GasUsed))
+	}
+	if m.CumulativeGasUsed != 0 {
+		n += 1 + sovIndexer(uint64(m.CumulativeGasUsed))
+	}
+	return n
+}
+
+func sovIndexer(x uint64) (n int) {
+	return (math_bits.Len64(x|1) + 6) / 7
+}
+func sozIndexer(x uint64) (n int) {
+	return sovIndexer(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (m *TxResult) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowIndexer
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: TxResult: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: TxResult: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Height", wireType)
+			}
+			m.Height = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Height |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TxIndex", wireType)
+			}
+			m.TxIndex = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.TxIndex |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MsgIndex", wireType)
+			}
+			m.MsgIndex = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.MsgIndex |= uint32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field EthTxIndex", wireType)
+			}
+			m.EthTxIndex = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.EthTxIndex |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Failed", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.Failed = bool(v != 0)
+		case 6:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field GasUsed", wireType)
+			}
+			m.GasUsed = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.GasUsed |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 7:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CumulativeGasUsed", wireType)
+			}
+			m.CumulativeGasUsed = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.CumulativeGasUsed |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipIndexer(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthIndexer
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skipIndexer(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	depth := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflowIndexer
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+		case 1:
+			iNdEx += 8
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowIndexer
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if length < 0 {
+				return 0, ErrInvalidLengthIndexer
+			}
+			iNdEx += length
+		case 3:
+			depth++
+		case 4:
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroupIndexer
+			}
+			depth--
+		case 5:
+			iNdEx += 4
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLengthIndexer
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
+	}
+	return 0, io.ErrUnexpectedEOF
+}
+
+var (
+	ErrInvalidLengthIndexer        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowIndexer          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroupIndexer = fmt.Errorf("proto: unexpected end of group")
+)