diff --git a/rpc/eth_api.go b/rpc/eth_api.go
index 35e4fa12..90abcbbc 100644
--- a/rpc/eth_api.go
+++ b/rpc/eth_api.go
@@ -8,6 +8,7 @@ import (
 	emintcrypto "github.com/cosmos/ethermint/crypto"
 	emintkeys "github.com/cosmos/ethermint/keys"
 	"github.com/cosmos/ethermint/rpc/args"
+	"github.com/cosmos/ethermint/utils"
 	"github.com/cosmos/ethermint/version"
 	"github.com/cosmos/ethermint/x/evm/types"
 
@@ -120,50 +121,53 @@ func (e *PublicEthAPI) BlockNumber() (hexutil.Uint64, error) {
 		return hexutil.Uint64(0), err
 	}
 
-	var qRes uint64
-	e.cliCtx.Codec.MustUnmarshalJSON(res, &qRes)
-
-	return hexutil.Uint64(qRes), nil
+	var out types.QueryResBlockNumber
+	e.cliCtx.Codec.MustUnmarshalJSON(res, &out)
+	return hexutil.Uint64(out.Number), nil
 }
 
 // GetBalance returns the provided account's balance up to the provided block number.
 func (e *PublicEthAPI) GetBalance(address common.Address, blockNum BlockNumber) (*hexutil.Big, error) {
 	ctx := e.cliCtx.WithHeight(blockNum.Int64())
-	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/balance/%s", types.ModuleName, address), nil)
+	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/balance/%s", types.ModuleName, address.Hex()), nil)
 	if err != nil {
 		return nil, err
 	}
 
-	var out *big.Int
+	var out types.QueryResBalance
 	e.cliCtx.Codec.MustUnmarshalJSON(res, &out)
+	val, err := utils.UnmarshalBigInt(out.Balance)
+	if err != nil {
+		return nil, err
+	}
 
-	return (*hexutil.Big)(out), nil
+	return (*hexutil.Big)(val), nil
 }
 
 // GetStorageAt returns the contract storage at the given address, block number, and key.
 func (e *PublicEthAPI) GetStorageAt(address common.Address, key string, blockNum BlockNumber) (hexutil.Bytes, error) {
 	ctx := e.cliCtx.WithHeight(blockNum.Int64())
-	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/storage/%s/%s", types.ModuleName, address, key), nil)
+	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/storage/%s/%s", types.ModuleName, address.Hex(), key), nil)
 	if err != nil {
 		return nil, err
 	}
 
-	var out []byte
+	var out types.QueryResStorage
 	e.cliCtx.Codec.MustUnmarshalJSON(res, &out)
-	return out, nil
+	return out.Value, nil
 }
 
 // GetTransactionCount returns the number of transactions at the given address up to the given block number.
 func (e *PublicEthAPI) GetTransactionCount(address common.Address, blockNum BlockNumber) (*hexutil.Uint64, error) {
 	ctx := e.cliCtx.WithHeight(blockNum.Int64())
-	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/nonce/%s", types.ModuleName, address), nil)
+	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/nonce/%s", types.ModuleName, address.Hex()), nil)
 	if err != nil {
 		return nil, err
 	}
 
-	var out *hexutil.Uint64
-	e.cliCtx.Codec.MustUnmarshalJSON(res, out)
-	return out, nil
+	var out types.QueryResNonce
+	e.cliCtx.Codec.MustUnmarshalJSON(res, &out)
+	return (*hexutil.Uint64)(&out.Nonce), nil
 }
 
 // GetBlockTransactionCountByHash returns the number of transactions in the block identified by hash.
@@ -200,14 +204,14 @@ func (e *PublicEthAPI) GetUncleCountByBlockNumber(blockNum BlockNumber) hexutil.
 // GetCode returns the contract code at the given address and block number.
 func (e *PublicEthAPI) GetCode(address common.Address, blockNumber BlockNumber) (hexutil.Bytes, error) {
 	ctx := e.cliCtx.WithHeight(blockNumber.Int64())
-	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/code/%s", types.ModuleName, address), nil)
+	res, _, err := ctx.QueryWithData(fmt.Sprintf("custom/%s/code/%s", types.ModuleName, address.Hex()), nil)
 	if err != nil {
 		return nil, err
 	}
 
-	var out []byte
+	var out types.QueryResCode
 	e.cliCtx.Codec.MustUnmarshalJSON(res, &out)
-	return out, nil
+	return out.Code, nil
 }
 
 // Sign signs the provided data using the private key of address via Geth's signature standard.
diff --git a/rpc/tester/tester_test.go b/rpc/tester/tester_test.go
index 785b7b25..d492d985 100644
--- a/rpc/tester/tester_test.go
+++ b/rpc/tester/tester_test.go
@@ -33,7 +33,7 @@ type Request struct {
 	Version string   `json:"jsonrpc"`
 	Method  string   `json:"method"`
 	Params  []string `json:"params"`
-	Id      int      `json:"id"`
+	ID      int      `json:"id"`
 }
 
 type RPCError struct {
@@ -44,7 +44,7 @@ type RPCError struct {
 
 type Response struct {
 	Error  *RPCError       `json:"error"`
-	Id     int             `json:"id"`
+	ID     int             `json:"id"`
 	Result json.RawMessage `json:"result,omitempty"`
 }
 
@@ -53,7 +53,7 @@ func createRequest(method string, params []string) Request {
 		Version: "2.0",
 		Method:  method,
 		Params:  params,
-		Id:      1,
+		ID:      1,
 	}
 }
 
diff --git a/utils/int.go b/utils/int.go
new file mode 100644
index 00000000..6c820045
--- /dev/null
+++ b/utils/int.go
@@ -0,0 +1,19 @@
+package utils
+
+import "math/big"
+
+// MarshalBigInt marshalls big int into text string for consistent encoding
+func MarshalBigInt(i *big.Int) string {
+	bz, err := i.MarshalText()
+	if err != nil {
+		panic(err)
+	}
+	return string(bz)
+}
+
+// UnmarshalBigInt unmarshalls string from *big.Int
+func UnmarshalBigInt(s string) (*big.Int, error) {
+	ret := new(big.Int)
+	err := ret.UnmarshalText([]byte(s))
+	return ret, err
+}
diff --git a/version/version.go b/version/version.go
index f973068f..b969a7fd 100644
--- a/version/version.go
+++ b/version/version.go
@@ -15,7 +15,7 @@ const AppName = "Ethermint"
 const Version = "0.0.0"
 
 // ProtocolVersion is the supported Ethereum protocol version (e.g., Homestead, Olympic, etc.)
-const ProtocolVersion uint = 63
+const ProtocolVersion = 63
 
 // GitCommit contains the git SHA1 short hash set by build flags.
 var GitCommit = ""
diff --git a/x/evm/client/cli/query.go b/x/evm/client/cli/query.go
index a94ac94c..21c19722 100644
--- a/x/evm/client/cli/query.go
+++ b/x/evm/client/cli/query.go
@@ -7,7 +7,6 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/context"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/ethermint/x/evm/types"
-	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/spf13/cobra"
 )
 
@@ -43,7 +42,7 @@ func GetCmdGetBlockNumber(queryRoute string, cdc *codec.Codec) *cobra.Command {
 				return nil
 			}
 
-			var out *hexutil.Big
+			var out types.QueryResBlockNumber
 			cdc.MustUnmarshalJSON(res, &out)
 			return cliCtx.PrintOutput(out)
 		},
@@ -68,7 +67,7 @@ func GetCmdGetStorageAt(queryRoute string, cdc *codec.Codec) *cobra.Command {
 				fmt.Printf("could not resolve: %s\n", err)
 				return nil
 			}
-			var out hexutil.Bytes
+			var out types.QueryResStorage
 			cdc.MustUnmarshalJSON(res, &out)
 			return cliCtx.PrintOutput(out)
 		},
@@ -92,9 +91,9 @@ func GetCmdGetCode(queryRoute string, cdc *codec.Codec) *cobra.Command {
 				fmt.Printf("could not resolve: %s\n", err)
 				return nil
 			}
-			var out []byte
+			var out types.QueryResCode
 			cdc.MustUnmarshalJSON(res, &out)
-			return cliCtx.PrintOutput(hexutil.Bytes(out))
+			return cliCtx.PrintOutput(out)
 		},
 	}
 }
@@ -116,7 +115,7 @@ func GetCmdGetNonce(queryRoute string, cdc *codec.Codec) *cobra.Command {
 				fmt.Printf("could not resolve: %s\n", err)
 				return nil
 			}
-			var out hexutil.Uint64
+			var out types.QueryResNonce
 			cdc.MustUnmarshalJSON(res, &out)
 			return cliCtx.PrintOutput(out)
 		},
diff --git a/x/evm/querier.go b/x/evm/querier.go
index 639ffb00..a983938c 100644
--- a/x/evm/querier.go
+++ b/x/evm/querier.go
@@ -3,7 +3,9 @@ package evm
 import (
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/ethermint/utils"
 	"github.com/cosmos/ethermint/version"
+	"github.com/cosmos/ethermint/x/evm/types"
 	ethcmn "github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	abci "github.com/tendermint/tendermint/abci/types"
@@ -44,8 +46,7 @@ func NewQuerier(keeper Keeper) sdk.Querier {
 func queryProtocolVersion(keeper Keeper) ([]byte, sdk.Error) {
 	vers := version.ProtocolVersion
 
-	bigRes := hexutil.Uint(vers)
-	res, err := codec.MarshalJSONIndent(keeper.cdc, bigRes)
+	res, err := codec.MarshalJSONIndent(keeper.cdc, hexutil.Uint(vers))
 	if err != nil {
 		panic("could not marshal result to JSON")
 	}
@@ -54,11 +55,13 @@ func queryProtocolVersion(keeper Keeper) ([]byte, sdk.Error) {
 }
 
 func queryBalance(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Error) {
-	addr := ethcmn.BytesToAddress([]byte(path[1]))
+	addr := ethcmn.HexToAddress(path[1])
 	balance := keeper.GetBalance(ctx, addr)
-	res, err := codec.MarshalJSONIndent(keeper.cdc, balance)
+
+	bRes := types.QueryResBalance{Balance: utils.MarshalBigInt(balance)}
+	res, err := codec.MarshalJSONIndent(keeper.cdc, bRes)
 	if err != nil {
-		panic("could not marshal result to JSON: ")
+		panic("could not marshal result to JSON: " + err.Error())
 	}
 
 	return res, nil
@@ -66,10 +69,8 @@ func queryBalance(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Er
 
 func queryBlockNumber(ctx sdk.Context, keeper Keeper) ([]byte, sdk.Error) {
 	num := ctx.BlockHeight()
-	hexUint := hexutil.Uint64(num)
-
-	res, err := codec.MarshalJSONIndent(keeper.cdc, hexUint)
-
+	bnRes := types.QueryResBlockNumber{Number: num}
+	res, err := codec.MarshalJSONIndent(keeper.cdc, bnRes)
 	if err != nil {
 		panic("could not marshal result to JSON: " + err.Error())
 	}
@@ -78,11 +79,11 @@ func queryBlockNumber(ctx sdk.Context, keeper Keeper) ([]byte, sdk.Error) {
 }
 
 func queryStorage(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Error) {
-	addr := ethcmn.BytesToAddress([]byte(path[1]))
-	key := ethcmn.BytesToHash([]byte(path[2]))
+	addr := ethcmn.HexToAddress(path[1])
+	key := ethcmn.HexToHash(path[2])
 	val := keeper.GetState(ctx, addr, key)
-	bRes := hexutil.Bytes(val.Bytes())
-	res, err := codec.MarshalJSONIndent(keeper.cdc, &bRes)
+	bRes := types.QueryResStorage{Value: val.Bytes()}
+	res, err := codec.MarshalJSONIndent(keeper.cdc, bRes)
 	if err != nil {
 		panic("could not marshal result to JSON: " + err.Error())
 	}
@@ -90,9 +91,10 @@ func queryStorage(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Er
 }
 
 func queryCode(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Error) {
-	addr := ethcmn.BytesToAddress([]byte(path[1]))
+	addr := ethcmn.HexToAddress(path[1])
 	code := keeper.GetCode(ctx, addr)
-	res, err := codec.MarshalJSONIndent(keeper.cdc, code)
+	cRes := types.QueryResCode{Code: code}
+	res, err := codec.MarshalJSONIndent(keeper.cdc, cRes)
 	if err != nil {
 		panic("could not marshal result to JSON: " + err.Error())
 	}
@@ -101,9 +103,9 @@ func queryCode(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Error
 }
 
 func queryNonce(ctx sdk.Context, path []string, keeper Keeper) ([]byte, sdk.Error) {
-	addr := ethcmn.BytesToAddress([]byte(path[1]))
+	addr := ethcmn.HexToAddress(path[1])
 	nonce := keeper.GetNonce(ctx, addr)
-	nRes := hexutil.Uint64(nonce)
+	nRes := types.QueryResNonce{Nonce: nonce}
 	res, err := codec.MarshalJSONIndent(keeper.cdc, nRes)
 	if err != nil {
 		panic("could not marshal result to JSON: " + err.Error())
diff --git a/x/evm/types/msg_encoding.go b/x/evm/types/msg_encoding.go
index 86218d28..5e62e434 100644
--- a/x/evm/types/msg_encoding.go
+++ b/x/evm/types/msg_encoding.go
@@ -1,9 +1,8 @@
 package types
 
 import (
-	"math/big"
-
 	"github.com/cosmos/cosmos-sdk/codec"
+	"github.com/cosmos/ethermint/utils"
 
 	ethcmn "github.com/ethereum/go-ethereum/common"
 )
@@ -19,7 +18,7 @@ func RegisterAmino(cdc *codec.Codec) {
 	cdc.RegisterConcrete(EncodableTxData{}, "ethermint/EncodedMessage", nil)
 }
 
-// TxData implements the Ethereum transaction data structure. It is used
+// EncodableTxData implements the Ethereum transaction data structure. It is used
 // solely as intended in Ethereum abiding by the protocol.
 type EncodableTxData struct {
 	AccountNonce uint64          `json:"nonce"`
@@ -47,33 +46,19 @@ func unmarshalAmino(td *EncodableTxData, text string) (err error) {
 	return cdc.UnmarshalBinaryBare([]byte(text), td)
 }
 
-func marshalBigInt(i *big.Int) string {
-	bz, err := i.MarshalText()
-	if err != nil {
-		panic(err)
-	}
-	return string(bz)
-}
-
-func unmarshalBigInt(s string) (*big.Int, error) {
-	ret := new(big.Int)
-	err := ret.UnmarshalText([]byte(s))
-	return ret, err
-}
-
 // MarshalAmino defines custom encoding scheme for TxData
 func (td TxData) MarshalAmino() (string, error) {
 	e := EncodableTxData{
 		AccountNonce: td.AccountNonce,
-		Price:        marshalBigInt(td.Price),
+		Price:        utils.MarshalBigInt(td.Price),
 		GasLimit:     td.GasLimit,
 		Recipient:    td.Recipient,
-		Amount:       marshalBigInt(td.Amount),
+		Amount:       utils.MarshalBigInt(td.Amount),
 		Payload:      td.Payload,
 
-		V: marshalBigInt(td.V),
-		R: marshalBigInt(td.R),
-		S: marshalBigInt(td.S),
+		V: utils.MarshalBigInt(td.V),
+		R: utils.MarshalBigInt(td.R),
+		S: utils.MarshalBigInt(td.S),
 
 		Hash: td.Hash,
 	}
@@ -95,7 +80,7 @@ func (td *TxData) UnmarshalAmino(text string) (err error) {
 	td.Payload = e.Payload
 	td.Hash = e.Hash
 
-	price, err := unmarshalBigInt(e.Price)
+	price, err := utils.UnmarshalBigInt(e.Price)
 	if err != nil {
 		return
 	}
@@ -105,7 +90,7 @@ func (td *TxData) UnmarshalAmino(text string) (err error) {
 		td.Price = price
 	}
 
-	amt, err := unmarshalBigInt(e.Amount)
+	amt, err := utils.UnmarshalBigInt(e.Amount)
 	if err != nil {
 		return
 	}
@@ -115,7 +100,7 @@ func (td *TxData) UnmarshalAmino(text string) (err error) {
 		td.Amount = amt
 	}
 
-	v, err := unmarshalBigInt(e.V)
+	v, err := utils.UnmarshalBigInt(e.V)
 	if err != nil {
 		return
 	}
@@ -125,7 +110,7 @@ func (td *TxData) UnmarshalAmino(text string) (err error) {
 		td.V = v
 	}
 
-	r, err := unmarshalBigInt(e.R)
+	r, err := utils.UnmarshalBigInt(e.R)
 	if err != nil {
 		return
 	}
@@ -135,7 +120,7 @@ func (td *TxData) UnmarshalAmino(text string) (err error) {
 		td.R = r
 	}
 
-	s, err := unmarshalBigInt(e.S)
+	s, err := utils.UnmarshalBigInt(e.S)
 	if err != nil {
 		return
 	}
diff --git a/x/evm/types/msg_test.go b/x/evm/types/msg_test.go
index c2f3ecad..4577f114 100644
--- a/x/evm/types/msg_test.go
+++ b/x/evm/types/msg_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/cosmos/ethermint/crypto"
+	"github.com/cosmos/ethermint/utils"
 	ethcmn "github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/stretchr/testify/require"
@@ -140,8 +141,8 @@ func TestMsgEthereumTxAmino(t *testing.T) {
 
 func TestMarshalAndUnmarshalInt(t *testing.T) {
 	i := big.NewInt(3)
-	m := marshalBigInt(i)
-	i2, err := unmarshalBigInt(m)
+	m := utils.MarshalBigInt(i)
+	i2, err := utils.UnmarshalBigInt(m)
 	require.NoError(t, err)
 
 	require.Equal(t, i, i2)
@@ -152,15 +153,15 @@ func TestMarshalAndUnmarshalData(t *testing.T) {
 	hash := ethcmn.BigToHash(big.NewInt(2))
 	e := EncodableTxData{
 		AccountNonce: 2,
-		Price:        marshalBigInt(big.NewInt(3)),
+		Price:        utils.MarshalBigInt(big.NewInt(3)),
 		GasLimit:     1,
 		Recipient:    &addr,
-		Amount:       marshalBigInt(big.NewInt(4)),
+		Amount:       utils.MarshalBigInt(big.NewInt(4)),
 		Payload:      []byte("test"),
 
-		V: marshalBigInt(big.NewInt(5)),
-		R: marshalBigInt(big.NewInt(6)),
-		S: marshalBigInt(big.NewInt(7)),
+		V: utils.MarshalBigInt(big.NewInt(5)),
+		R: utils.MarshalBigInt(big.NewInt(6)),
+		S: utils.MarshalBigInt(big.NewInt(7)),
 
 		Hash: &hash,
 	}
diff --git a/x/evm/types/querier.go b/x/evm/types/querier.go
new file mode 100644
index 00000000..9a8972bb
--- /dev/null
+++ b/x/evm/types/querier.go
@@ -0,0 +1,55 @@
+package types
+
+// QueryResProtocolVersion is response type for protocol version query
+type QueryResProtocolVersion struct {
+	Version string `json:"version"`
+}
+
+func (q QueryResProtocolVersion) String() string {
+	return q.Version
+}
+
+// QueryResBalance is response type for balance query
+type QueryResBalance struct {
+	Balance string `json:"balance"`
+}
+
+func (q QueryResBalance) String() string {
+	return q.Balance
+}
+
+// QueryResBlockNumber is response type for block number query
+type QueryResBlockNumber struct {
+	Number int64 `json:"blockNumber"`
+}
+
+func (q QueryResBlockNumber) String() string {
+	return string(q.Number)
+}
+
+// QueryResStorage is response type for storage query
+type QueryResStorage struct {
+	Value []byte `json:"value"`
+}
+
+func (q QueryResStorage) String() string {
+	return string(q.Value)
+}
+
+// QueryResCode is response type for code query
+type QueryResCode struct {
+	Code []byte
+}
+
+func (q QueryResCode) String() string {
+	return string(q.Code)
+}
+
+// QueryResNonce is response type for Nonce query
+type QueryResNonce struct {
+	Nonce uint64 `json:"nonce"`
+}
+
+func (q QueryResNonce) String() string {
+	return string(q.Nonce)
+}