diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b13ba3f6..84b67b84d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Lotus changelog
 
+# v1.20.2 / 2023-03-09
+
+This is a HIGHLY RECOMMENDED patch release for node operators/API service providers that run ETH RPC service and an optional release for Storage Providers.
+
+## Bug fixes
+- fix: EthAPI: use StateCompute for feeHistory; apply minimum gas premium #10413
+- fix: eth API: return correct txIdx around null blocks #10419
+- fix: Eth API: make block parameter parsing sounder. #10427
+
+## Improvement
+- feat: Lotus Gateway: Add missing methods - master #10420
+- feat: mempool: Reduce minimum replace fee from 1.25x to 1.1x #10416
+ - We recommend storage providers to update your nodes to this patch, that will help improve developers who use Ethereum tooling's experience.
+
 # v1.20.1 / 2023-03-06
 
 This an optional patch releases for node operators/API service providers that run ETH RPC service.
diff --git a/api/api_gateway.go b/api/api_gateway.go
index 2e877fb1a..9bc69cc0f 100644
--- a/api/api_gateway.go
+++ b/api/api_gateway.go
@@ -15,6 +15,7 @@ import (
 	apitypes "github.com/filecoin-project/lotus/api/types"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/types/ethtypes"
+	"github.com/filecoin-project/lotus/node/modules/dtypes"
 )
 
 //                       MODIFYING THE API INTERFACE
@@ -47,15 +48,18 @@ type Gateway interface {
 	ChainReadObj(context.Context, cid.Cid) ([]byte, error)
 	ChainGetGenesis(context.Context) (*types.TipSet, error)
 	GasEstimateMessageGas(ctx context.Context, msg *types.Message, spec *MessageSendSpec, tsk types.TipSetKey) (*types.Message, error)
+	MpoolGetNonce(ctx context.Context, addr address.Address) (uint64, error)
 	MpoolPush(ctx context.Context, sm *types.SignedMessage) (cid.Cid, error)
 	MsigGetAvailableBalance(ctx context.Context, addr address.Address, tsk types.TipSetKey) (types.BigInt, error)
 	MsigGetPending(context.Context, address.Address, types.TipSetKey) ([]*MsigTransaction, error)
 	MsigGetVested(ctx context.Context, addr address.Address, start types.TipSetKey, end types.TipSetKey) (types.BigInt, error)
 	MsigGetVestingSchedule(ctx context.Context, addr address.Address, tsk types.TipSetKey) (MsigVesting, error)
 	StateAccountKey(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error)
+	StateCall(ctx context.Context, msg *types.Message, tsk types.TipSetKey) (*InvocResult, error)
 	StateDealProviderCollateralBounds(ctx context.Context, size abi.PaddedPieceSize, verified bool, tsk types.TipSetKey) (DealCollateralBounds, error)
+	StateDecodeParams(ctx context.Context, toAddr address.Address, method abi.MethodNum, params []byte, tsk types.TipSetKey) (interface{}, error)
 	StateGetActor(ctx context.Context, actor address.Address, ts types.TipSetKey) (*types.Actor, error)
-	StateReadState(ctx context.Context, actor address.Address, tsk types.TipSetKey) (*ActorState, error) //perm:read
+	StateReadState(ctx context.Context, actor address.Address, tsk types.TipSetKey) (*ActorState, error)
 	StateListMiners(ctx context.Context, tsk types.TipSetKey) ([]address.Address, error)
 	StateLookupID(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error)
 	StateMarketBalance(ctx context.Context, addr address.Address, tsk types.TipSetKey) (MarketBalance, error)
@@ -63,6 +67,7 @@ type Gateway interface {
 	StateMinerInfo(ctx context.Context, actor address.Address, tsk types.TipSetKey) (MinerInfo, error)
 	StateMinerProvingDeadline(ctx context.Context, addr address.Address, tsk types.TipSetKey) (*dline.Info, error)
 	StateMinerPower(context.Context, address.Address, types.TipSetKey) (*MinerPower, error)
+	StateNetworkName(context.Context) (dtypes.NetworkName, error)
 	StateNetworkVersion(context.Context, types.TipSetKey) (apitypes.NetworkVersion, error)
 	StateSectorGetInfo(ctx context.Context, maddr address.Address, n abi.SectorNumber, tsk types.TipSetKey) (*miner.SectorOnChainInfo, error)
 	StateVerifiedClientStatus(ctx context.Context, addr address.Address, tsk types.TipSetKey) (*abi.StoragePower, error)
diff --git a/api/docgen/docgen.go b/api/docgen/docgen.go
index 65d71d208..0e97997a6 100644
--- a/api/docgen/docgen.go
+++ b/api/docgen/docgen.go
@@ -401,6 +401,10 @@ func init() {
 		FromBlock: pstring("2301220"),
 		Address:   []ethtypes.EthAddress{ethaddr},
 	})
+
+	percent := types.Percent(123)
+	addExample(percent)
+	addExample(&percent)
 }
 
 func GetAPIType(name, pkg string) (i interface{}, t reflect.Type, permStruct []reflect.Type) {
diff --git a/api/proxy_gen.go b/api/proxy_gen.go
index ef257e69b..70579af1a 100644
--- a/api/proxy_gen.go
+++ b/api/proxy_gen.go
@@ -720,6 +720,8 @@ type GatewayMethods struct {
 
 	GasEstimateMessageGas func(p0 context.Context, p1 *types.Message, p2 *MessageSendSpec, p3 types.TipSetKey) (*types.Message, error) ``
 
+	MpoolGetNonce func(p0 context.Context, p1 address.Address) (uint64, error) ``
+
 	MpoolPush func(p0 context.Context, p1 *types.SignedMessage) (cid.Cid, error) ``
 
 	MsigGetAvailableBalance func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (types.BigInt, error) ``
@@ -736,8 +738,12 @@ type GatewayMethods struct {
 
 	StateAccountKey func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (address.Address, error) ``
 
+	StateCall func(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*InvocResult, error) ``
+
 	StateDealProviderCollateralBounds func(p0 context.Context, p1 abi.PaddedPieceSize, p2 bool, p3 types.TipSetKey) (DealCollateralBounds, error) ``
 
+	StateDecodeParams func(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) ``
+
 	StateGetActor func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*types.Actor, error) ``
 
 	StateListMiners func(p0 context.Context, p1 types.TipSetKey) ([]address.Address, error) ``
@@ -754,9 +760,11 @@ type GatewayMethods struct {
 
 	StateMinerProvingDeadline func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*dline.Info, error) ``
 
+	StateNetworkName func(p0 context.Context) (dtypes.NetworkName, error) ``
+
 	StateNetworkVersion func(p0 context.Context, p1 types.TipSetKey) (apitypes.NetworkVersion, error) ``
 
-	StateReadState func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*ActorState, error) `perm:"read"`
+	StateReadState func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*ActorState, error) ``
 
 	StateSearchMsg func(p0 context.Context, p1 types.TipSetKey, p2 cid.Cid, p3 abi.ChainEpoch, p4 bool) (*MsgLookup, error) ``
 
@@ -4563,6 +4571,17 @@ func (s *GatewayStub) GasEstimateMessageGas(p0 context.Context, p1 *types.Messag
 	return nil, ErrNotSupported
 }
 
+func (s *GatewayStruct) MpoolGetNonce(p0 context.Context, p1 address.Address) (uint64, error) {
+	if s.Internal.MpoolGetNonce == nil {
+		return 0, ErrNotSupported
+	}
+	return s.Internal.MpoolGetNonce(p0, p1)
+}
+
+func (s *GatewayStub) MpoolGetNonce(p0 context.Context, p1 address.Address) (uint64, error) {
+	return 0, ErrNotSupported
+}
+
 func (s *GatewayStruct) MpoolPush(p0 context.Context, p1 *types.SignedMessage) (cid.Cid, error) {
 	if s.Internal.MpoolPush == nil {
 		return *new(cid.Cid), ErrNotSupported
@@ -4651,6 +4670,17 @@ func (s *GatewayStub) StateAccountKey(p0 context.Context, p1 address.Address, p2
 	return *new(address.Address), ErrNotSupported
 }
 
+func (s *GatewayStruct) StateCall(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*InvocResult, error) {
+	if s.Internal.StateCall == nil {
+		return nil, ErrNotSupported
+	}
+	return s.Internal.StateCall(p0, p1, p2)
+}
+
+func (s *GatewayStub) StateCall(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*InvocResult, error) {
+	return nil, ErrNotSupported
+}
+
 func (s *GatewayStruct) StateDealProviderCollateralBounds(p0 context.Context, p1 abi.PaddedPieceSize, p2 bool, p3 types.TipSetKey) (DealCollateralBounds, error) {
 	if s.Internal.StateDealProviderCollateralBounds == nil {
 		return *new(DealCollateralBounds), ErrNotSupported
@@ -4662,6 +4692,17 @@ func (s *GatewayStub) StateDealProviderCollateralBounds(p0 context.Context, p1 a
 	return *new(DealCollateralBounds), ErrNotSupported
 }
 
+func (s *GatewayStruct) StateDecodeParams(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) {
+	if s.Internal.StateDecodeParams == nil {
+		return nil, ErrNotSupported
+	}
+	return s.Internal.StateDecodeParams(p0, p1, p2, p3, p4)
+}
+
+func (s *GatewayStub) StateDecodeParams(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) {
+	return nil, ErrNotSupported
+}
+
 func (s *GatewayStruct) StateGetActor(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*types.Actor, error) {
 	if s.Internal.StateGetActor == nil {
 		return nil, ErrNotSupported
@@ -4750,6 +4791,17 @@ func (s *GatewayStub) StateMinerProvingDeadline(p0 context.Context, p1 address.A
 	return nil, ErrNotSupported
 }
 
+func (s *GatewayStruct) StateNetworkName(p0 context.Context) (dtypes.NetworkName, error) {
+	if s.Internal.StateNetworkName == nil {
+		return *new(dtypes.NetworkName), ErrNotSupported
+	}
+	return s.Internal.StateNetworkName(p0)
+}
+
+func (s *GatewayStub) StateNetworkName(p0 context.Context) (dtypes.NetworkName, error) {
+	return *new(dtypes.NetworkName), ErrNotSupported
+}
+
 func (s *GatewayStruct) StateNetworkVersion(p0 context.Context, p1 types.TipSetKey) (apitypes.NetworkVersion, error) {
 	if s.Internal.StateNetworkVersion == nil {
 		return *new(apitypes.NetworkVersion), ErrNotSupported
diff --git a/api/v0api/gateway.go b/api/v0api/gateway.go
index 674371c14..2a0bfb2f7 100644
--- a/api/v0api/gateway.go
+++ b/api/v0api/gateway.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/chain/types"
+	"github.com/filecoin-project/lotus/node/modules/dtypes"
 )
 
 //                       MODIFYING THE API INTERFACE
@@ -44,12 +45,15 @@ type Gateway interface {
 	ChainNotify(context.Context) (<-chan []*api.HeadChange, error)
 	ChainReadObj(context.Context, cid.Cid) ([]byte, error)
 	GasEstimateMessageGas(ctx context.Context, msg *types.Message, spec *api.MessageSendSpec, tsk types.TipSetKey) (*types.Message, error)
+	MpoolGetNonce(ctx context.Context, addr address.Address) (uint64, error)
 	MpoolPush(ctx context.Context, sm *types.SignedMessage) (cid.Cid, error)
 	MsigGetAvailableBalance(ctx context.Context, addr address.Address, tsk types.TipSetKey) (types.BigInt, error)
 	MsigGetVested(ctx context.Context, addr address.Address, start types.TipSetKey, end types.TipSetKey) (types.BigInt, error)
 	MsigGetPending(context.Context, address.Address, types.TipSetKey) ([]*api.MsigTransaction, error)
 	StateAccountKey(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error)
+	StateCall(ctx context.Context, msg *types.Message, tsk types.TipSetKey) (*api.InvocResult, error)
 	StateDealProviderCollateralBounds(ctx context.Context, size abi.PaddedPieceSize, verified bool, tsk types.TipSetKey) (api.DealCollateralBounds, error)
+	StateDecodeParams(ctx context.Context, toAddr address.Address, method abi.MethodNum, params []byte, tsk types.TipSetKey) (interface{}, error)
 	StateGetActor(ctx context.Context, actor address.Address, ts types.TipSetKey) (*types.Actor, error)
 	StateGetReceipt(context.Context, cid.Cid, types.TipSetKey) (*types.MessageReceipt, error)
 	StateListMiners(ctx context.Context, tsk types.TipSetKey) ([]address.Address, error)
@@ -59,6 +63,7 @@ type Gateway interface {
 	StateMinerInfo(ctx context.Context, actor address.Address, tsk types.TipSetKey) (api.MinerInfo, error)
 	StateMinerProvingDeadline(ctx context.Context, addr address.Address, tsk types.TipSetKey) (*dline.Info, error)
 	StateMinerPower(context.Context, address.Address, types.TipSetKey) (*api.MinerPower, error)
+	StateNetworkName(context.Context) (dtypes.NetworkName, error)
 	StateNetworkVersion(context.Context, types.TipSetKey) (abinetwork.Version, error)
 	StateSearchMsg(ctx context.Context, msg cid.Cid) (*api.MsgLookup, error)
 	StateSectorGetInfo(ctx context.Context, maddr address.Address, n abi.SectorNumber, tsk types.TipSetKey) (*miner.SectorOnChainInfo, error)
diff --git a/api/v0api/proxy_gen.go b/api/v0api/proxy_gen.go
index 5fa0d949c..17a1ae84a 100644
--- a/api/v0api/proxy_gen.go
+++ b/api/v0api/proxy_gen.go
@@ -451,6 +451,8 @@ type GatewayMethods struct {
 
 	GasEstimateMessageGas func(p0 context.Context, p1 *types.Message, p2 *api.MessageSendSpec, p3 types.TipSetKey) (*types.Message, error) ``
 
+	MpoolGetNonce func(p0 context.Context, p1 address.Address) (uint64, error) ``
+
 	MpoolPush func(p0 context.Context, p1 *types.SignedMessage) (cid.Cid, error) ``
 
 	MsigGetAvailableBalance func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (types.BigInt, error) ``
@@ -461,8 +463,12 @@ type GatewayMethods struct {
 
 	StateAccountKey func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (address.Address, error) ``
 
+	StateCall func(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*api.InvocResult, error) ``
+
 	StateDealProviderCollateralBounds func(p0 context.Context, p1 abi.PaddedPieceSize, p2 bool, p3 types.TipSetKey) (api.DealCollateralBounds, error) ``
 
+	StateDecodeParams func(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) ``
+
 	StateGetActor func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*types.Actor, error) ``
 
 	StateGetReceipt func(p0 context.Context, p1 cid.Cid, p2 types.TipSetKey) (*types.MessageReceipt, error) ``
@@ -481,6 +487,8 @@ type GatewayMethods struct {
 
 	StateMinerProvingDeadline func(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*dline.Info, error) ``
 
+	StateNetworkName func(p0 context.Context) (dtypes.NetworkName, error) ``
+
 	StateNetworkVersion func(p0 context.Context, p1 types.TipSetKey) (abinetwork.Version, error) ``
 
 	StateSearchMsg func(p0 context.Context, p1 cid.Cid) (*api.MsgLookup, error) ``
@@ -2677,6 +2685,17 @@ func (s *GatewayStub) GasEstimateMessageGas(p0 context.Context, p1 *types.Messag
 	return nil, ErrNotSupported
 }
 
+func (s *GatewayStruct) MpoolGetNonce(p0 context.Context, p1 address.Address) (uint64, error) {
+	if s.Internal.MpoolGetNonce == nil {
+		return 0, ErrNotSupported
+	}
+	return s.Internal.MpoolGetNonce(p0, p1)
+}
+
+func (s *GatewayStub) MpoolGetNonce(p0 context.Context, p1 address.Address) (uint64, error) {
+	return 0, ErrNotSupported
+}
+
 func (s *GatewayStruct) MpoolPush(p0 context.Context, p1 *types.SignedMessage) (cid.Cid, error) {
 	if s.Internal.MpoolPush == nil {
 		return *new(cid.Cid), ErrNotSupported
@@ -2732,6 +2751,17 @@ func (s *GatewayStub) StateAccountKey(p0 context.Context, p1 address.Address, p2
 	return *new(address.Address), ErrNotSupported
 }
 
+func (s *GatewayStruct) StateCall(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*api.InvocResult, error) {
+	if s.Internal.StateCall == nil {
+		return nil, ErrNotSupported
+	}
+	return s.Internal.StateCall(p0, p1, p2)
+}
+
+func (s *GatewayStub) StateCall(p0 context.Context, p1 *types.Message, p2 types.TipSetKey) (*api.InvocResult, error) {
+	return nil, ErrNotSupported
+}
+
 func (s *GatewayStruct) StateDealProviderCollateralBounds(p0 context.Context, p1 abi.PaddedPieceSize, p2 bool, p3 types.TipSetKey) (api.DealCollateralBounds, error) {
 	if s.Internal.StateDealProviderCollateralBounds == nil {
 		return *new(api.DealCollateralBounds), ErrNotSupported
@@ -2743,6 +2773,17 @@ func (s *GatewayStub) StateDealProviderCollateralBounds(p0 context.Context, p1 a
 	return *new(api.DealCollateralBounds), ErrNotSupported
 }
 
+func (s *GatewayStruct) StateDecodeParams(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) {
+	if s.Internal.StateDecodeParams == nil {
+		return nil, ErrNotSupported
+	}
+	return s.Internal.StateDecodeParams(p0, p1, p2, p3, p4)
+}
+
+func (s *GatewayStub) StateDecodeParams(p0 context.Context, p1 address.Address, p2 abi.MethodNum, p3 []byte, p4 types.TipSetKey) (interface{}, error) {
+	return nil, ErrNotSupported
+}
+
 func (s *GatewayStruct) StateGetActor(p0 context.Context, p1 address.Address, p2 types.TipSetKey) (*types.Actor, error) {
 	if s.Internal.StateGetActor == nil {
 		return nil, ErrNotSupported
@@ -2842,6 +2883,17 @@ func (s *GatewayStub) StateMinerProvingDeadline(p0 context.Context, p1 address.A
 	return nil, ErrNotSupported
 }
 
+func (s *GatewayStruct) StateNetworkName(p0 context.Context) (dtypes.NetworkName, error) {
+	if s.Internal.StateNetworkName == nil {
+		return *new(dtypes.NetworkName), ErrNotSupported
+	}
+	return s.Internal.StateNetworkName(p0)
+}
+
+func (s *GatewayStub) StateNetworkName(p0 context.Context) (dtypes.NetworkName, error) {
+	return *new(dtypes.NetworkName), ErrNotSupported
+}
+
 func (s *GatewayStruct) StateNetworkVersion(p0 context.Context, p1 types.TipSetKey) (abinetwork.Version, error) {
 	if s.Internal.StateNetworkVersion == nil {
 		return *new(abinetwork.Version), ErrNotSupported
diff --git a/build/openrpc/full.json.gz b/build/openrpc/full.json.gz
index 16fe7b837..acf4fb80f 100644
Binary files a/build/openrpc/full.json.gz and b/build/openrpc/full.json.gz differ
diff --git a/build/openrpc/gateway.json.gz b/build/openrpc/gateway.json.gz
index 60bf3dd77..bae9a6a79 100644
Binary files a/build/openrpc/gateway.json.gz and b/build/openrpc/gateway.json.gz differ
diff --git a/build/openrpc/miner.json.gz b/build/openrpc/miner.json.gz
index b3f1e3c25..be588eccd 100644
Binary files a/build/openrpc/miner.json.gz and b/build/openrpc/miner.json.gz differ
diff --git a/build/openrpc/worker.json.gz b/build/openrpc/worker.json.gz
index ff47f7b11..1f10d0910 100644
Binary files a/build/openrpc/worker.json.gz and b/build/openrpc/worker.json.gz differ
diff --git a/build/version.go b/build/version.go
index 4541c99e7..fcf02d27b 100644
--- a/build/version.go
+++ b/build/version.go
@@ -37,7 +37,7 @@ func BuildTypeString() string {
 }
 
 // BuildVersion is the local build version
-const BuildVersion = "1.20.1"
+const BuildVersion = "1.20.2"
 
 func UserVersion() string {
 	if os.Getenv("LOTUS_VERSION_IGNORE_COMMIT") == "1" {
diff --git a/chain/messagepool/config.go b/chain/messagepool/config.go
index 5b7e2c590..72b7d9567 100644
--- a/chain/messagepool/config.go
+++ b/chain/messagepool/config.go
@@ -13,7 +13,11 @@ import (
 )
 
 var (
-	ReplaceByFeeRatioDefault  = 1.25
+	ReplaceByFeePercentageMinimum types.Percent = 110
+	ReplaceByFeePercentageDefault types.Percent = 125
+)
+
+var (
 	MemPoolSizeLimitHiDefault = 30000
 	MemPoolSizeLimitLoDefault = 20000
 	PruneCooldownDefault      = time.Minute
@@ -60,9 +64,9 @@ func (mp *MessagePool) getConfig() *types.MpoolConfig {
 }
 
 func validateConfg(cfg *types.MpoolConfig) error {
-	if cfg.ReplaceByFeeRatio < ReplaceByFeeRatioDefault {
-		return fmt.Errorf("'ReplaceByFeeRatio' is less than required %f < %f",
-			cfg.ReplaceByFeeRatio, ReplaceByFeeRatioDefault)
+	if cfg.ReplaceByFeeRatio < ReplaceByFeePercentageMinimum {
+		return fmt.Errorf("'ReplaceByFeeRatio' is less than required %s < %s",
+			cfg.ReplaceByFeeRatio, ReplaceByFeePercentageMinimum)
 	}
 	if cfg.GasLimitOverestimation < 1 {
 		return fmt.Errorf("'GasLimitOverestimation' cannot be less than 1")
@@ -91,7 +95,7 @@ func DefaultConfig() *types.MpoolConfig {
 	return &types.MpoolConfig{
 		SizeLimitHigh:          MemPoolSizeLimitHiDefault,
 		SizeLimitLow:           MemPoolSizeLimitLoDefault,
-		ReplaceByFeeRatio:      ReplaceByFeeRatioDefault,
+		ReplaceByFeeRatio:      ReplaceByFeePercentageDefault,
 		PruneCooldown:          PruneCooldownDefault,
 		GasLimitOverestimation: GasLimitOverestimation,
 	}
diff --git a/chain/messagepool/messagepool.go b/chain/messagepool/messagepool.go
index dabd2cb33..06fc12b92 100644
--- a/chain/messagepool/messagepool.go
+++ b/chain/messagepool/messagepool.go
@@ -48,10 +48,8 @@ var log = logging.Logger("messagepool")
 
 var futureDebug = false
 
-var rbfNumBig = types.NewInt(uint64((ReplaceByFeeRatioDefault - 1) * RbfDenom))
-var rbfDenomBig = types.NewInt(RbfDenom)
-
-const RbfDenom = 256
+var rbfNumBig = types.NewInt(uint64(ReplaceByFeePercentageMinimum))
+var rbfDenomBig = types.NewInt(100)
 
 var RepublishInterval = time.Duration(10*build.BlockDelaySecs+build.PropagationDelaySecs) * time.Second
 
@@ -198,7 +196,13 @@ func newMsgSet(nonce uint64) *msgSet {
 }
 
 func ComputeMinRBF(curPrem abi.TokenAmount) abi.TokenAmount {
-	minPrice := types.BigAdd(curPrem, types.BigDiv(types.BigMul(curPrem, rbfNumBig), rbfDenomBig))
+	minPrice := types.BigDiv(types.BigMul(curPrem, rbfNumBig), rbfDenomBig)
+	return types.BigAdd(minPrice, types.NewInt(1))
+}
+
+func ComputeRBF(curPrem abi.TokenAmount, replaceByFeeRatio types.Percent) abi.TokenAmount {
+	rbfNumBig := types.NewInt(uint64(replaceByFeeRatio))
+	minPrice := types.BigDiv(types.BigMul(curPrem, rbfNumBig), rbfDenomBig)
 	return types.BigAdd(minPrice, types.NewInt(1))
 }
 
diff --git a/chain/types/mpool.go b/chain/types/mpool.go
index cf08177e9..497d5c590 100644
--- a/chain/types/mpool.go
+++ b/chain/types/mpool.go
@@ -10,7 +10,7 @@ type MpoolConfig struct {
 	PriorityAddrs          []address.Address
 	SizeLimitHigh          int
 	SizeLimitLow           int
-	ReplaceByFeeRatio      float64
+	ReplaceByFeeRatio      Percent
 	PruneCooldown          time.Duration
 	GasLimitOverestimation float64
 }
diff --git a/chain/types/percent.go b/chain/types/percent.go
new file mode 100644
index 000000000..858d9a2e3
--- /dev/null
+++ b/chain/types/percent.go
@@ -0,0 +1,39 @@
+package types
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+
+	"golang.org/x/xerrors"
+)
+
+// Percent stores a signed percentage as an int64. When converted to a string (or json), it's stored
+// as a decimal with two places (e.g., 100% -> 1.00).
+type Percent int64
+
+func (p Percent) String() string {
+	abs := p
+	sign := ""
+	if abs < 0 {
+		abs = -abs
+		sign = "-"
+	}
+	return fmt.Sprintf(`%s%d.%d`, sign, abs/100, abs%100)
+}
+
+func (p Percent) MarshalJSON() ([]byte, error) {
+	return []byte(p.String()), nil
+}
+
+func (p *Percent) UnmarshalJSON(b []byte) error {
+	flt, err := strconv.ParseFloat(string(b)+"e2", 64)
+	if err != nil {
+		return xerrors.Errorf("unable to parse ratio %s: %w", string(b), err)
+	}
+	if math.Trunc(flt) != flt {
+		return xerrors.Errorf("ratio may only have two decimals: %s", string(b))
+	}
+	*p = Percent(flt)
+	return nil
+}
diff --git a/chain/types/percent_test.go b/chain/types/percent_test.go
new file mode 100644
index 000000000..7364c2447
--- /dev/null
+++ b/chain/types/percent_test.go
@@ -0,0 +1,34 @@
+package types
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPercent(t *testing.T) {
+	for _, tc := range []struct {
+		p Percent
+		s string
+	}{
+		{100, "1.0"},
+		{111, "1.11"},
+		{12, "0.12"},
+		{-12, "-0.12"},
+		{1012, "10.12"},
+		{-1012, "-10.12"},
+		{0, "0.0"},
+	} {
+		tc := tc
+		t.Run(fmt.Sprintf("%d <> %s", tc.p, tc.s), func(t *testing.T) {
+			m, err := tc.p.MarshalJSON()
+			require.NoError(t, err)
+			require.Equal(t, tc.s, string(m))
+			var p Percent
+			require.NoError(t, p.UnmarshalJSON([]byte(tc.s)))
+			require.Equal(t, tc.p, p)
+		})
+	}
+
+}
diff --git a/cli/mpool.go b/cli/mpool.go
index e098806cb..c83fb4b61 100644
--- a/cli/mpool.go
+++ b/cli/mpool.go
@@ -461,7 +461,12 @@ var MpoolReplaceCmd = &cli.Command{
 		msg := found.Message
 
 		if cctx.Bool("auto") {
-			minRBF := messagepool.ComputeMinRBF(msg.GasPremium)
+			cfg, err := api.MpoolGetConfig(ctx)
+			if err != nil {
+				return xerrors.Errorf("failed to lookup the message pool config: %w", err)
+			}
+
+			defaultRBF := messagepool.ComputeRBF(msg.GasPremium, cfg.ReplaceByFeeRatio)
 
 			var mss *lapi.MessageSendSpec
 			if cctx.IsSet("fee-limit") {
@@ -482,7 +487,7 @@ var MpoolReplaceCmd = &cli.Command{
 				return xerrors.Errorf("failed to estimate gas values: %w", err)
 			}
 
-			msg.GasPremium = big.Max(retm.GasPremium, minRBF)
+			msg.GasPremium = big.Max(retm.GasPremium, defaultRBF)
 			msg.GasFeeCap = big.Max(retm.GasFeeCap, msg.GasPremium)
 
 			mff := func() (abi.TokenAmount, error) {
diff --git a/cli/mpool_test.go b/cli/mpool_test.go
index 01b49d4b3..0aa055ba3 100644
--- a/cli/mpool_test.go
+++ b/cli/mpool_test.go
@@ -15,6 +15,7 @@ import (
 	"github.com/filecoin-project/go-state-types/big"
 
 	"github.com/filecoin-project/lotus/api"
+	"github.com/filecoin-project/lotus/chain/messagepool"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/types/mock"
 	"github.com/filecoin-project/lotus/chain/wallet"
@@ -298,6 +299,7 @@ func TestReplace(t *testing.T) {
 			mockApi.EXPECT().ChainGetMessage(ctx, sm.Cid()).Return(&sm.Message, nil),
 			mockApi.EXPECT().ChainHead(ctx).Return(nil, nil),
 			mockApi.EXPECT().MpoolPending(ctx, types.EmptyTSK).Return([]*types.SignedMessage{sm}, nil),
+			mockApi.EXPECT().MpoolGetConfig(ctx).Return(messagepool.DefaultConfig(), nil),
 			// use gomock.any to match the message in expected api calls
 			// since the replace function modifies the message between calls, it would be pointless to try to match the exact argument
 			mockApi.EXPECT().GasEstimateMessageGas(ctx, gomock.Any(), &mss, types.EmptyTSK).Return(&sm.Message, nil),
@@ -342,6 +344,7 @@ func TestReplace(t *testing.T) {
 		gomock.InOrder(
 			mockApi.EXPECT().ChainHead(ctx).Return(nil, nil),
 			mockApi.EXPECT().MpoolPending(ctx, types.EmptyTSK).Return([]*types.SignedMessage{sm}, nil),
+			mockApi.EXPECT().MpoolGetConfig(ctx).Return(messagepool.DefaultConfig(), nil),
 			// use gomock.any to match the message in expected api calls
 			// since the replace function modifies the message between calls, it would be pointless to try to match the exact argument
 			mockApi.EXPECT().GasEstimateMessageGas(ctx, gomock.Any(), &mss, types.EmptyTSK).Return(&sm.Message, nil),
@@ -538,7 +541,7 @@ func TestConfig(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		mpoolCfg := &types.MpoolConfig{PriorityAddrs: []address.Address{senderAddr}, SizeLimitHigh: 1234567, SizeLimitLow: 6, ReplaceByFeeRatio: 0.25}
+		mpoolCfg := &types.MpoolConfig{PriorityAddrs: []address.Address{senderAddr}, SizeLimitHigh: 1234567, SizeLimitLow: 6, ReplaceByFeeRatio: types.Percent(25)}
 		gomock.InOrder(
 			mockApi.EXPECT().MpoolGetConfig(ctx).Return(mpoolCfg, nil),
 		)
@@ -566,7 +569,7 @@ func TestConfig(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		mpoolCfg := &types.MpoolConfig{PriorityAddrs: []address.Address{senderAddr}, SizeLimitHigh: 234567, SizeLimitLow: 3, ReplaceByFeeRatio: 0.33}
+		mpoolCfg := &types.MpoolConfig{PriorityAddrs: []address.Address{senderAddr}, SizeLimitHigh: 234567, SizeLimitLow: 3, ReplaceByFeeRatio: types.Percent(33)}
 		gomock.InOrder(
 			mockApi.EXPECT().MpoolSetConfig(ctx, mpoolCfg).Return(nil),
 		)
diff --git a/documentation/en/api-v0-methods.md b/documentation/en/api-v0-methods.md
index fe639b2f3..e47b90904 100644
--- a/documentation/en/api-v0-methods.md
+++ b/documentation/en/api-v0-methods.md
@@ -2879,7 +2879,7 @@ Response:
   ],
   "SizeLimitHigh": 123,
   "SizeLimitLow": 123,
-  "ReplaceByFeeRatio": 12.3,
+  "ReplaceByFeeRatio": 1.23,
   "PruneCooldown": 60000000000,
   "GasLimitOverestimation": 12.3
 }
@@ -3167,7 +3167,7 @@ Inputs:
     ],
     "SizeLimitHigh": 123,
     "SizeLimitLow": 123,
-    "ReplaceByFeeRatio": 12.3,
+    "ReplaceByFeeRatio": 1.23,
     "PruneCooldown": 60000000000,
     "GasLimitOverestimation": 12.3
   }
diff --git a/documentation/en/api-v1-unstable-methods.md b/documentation/en/api-v1-unstable-methods.md
index 8e8176c23..5c3ac336d 100644
--- a/documentation/en/api-v1-unstable-methods.md
+++ b/documentation/en/api-v1-unstable-methods.md
@@ -3816,7 +3816,7 @@ Response:
   ],
   "SizeLimitHigh": 123,
   "SizeLimitLow": 123,
-  "ReplaceByFeeRatio": 12.3,
+  "ReplaceByFeeRatio": 1.23,
   "PruneCooldown": 60000000000,
   "GasLimitOverestimation": 12.3
 }
@@ -4104,7 +4104,7 @@ Inputs:
     ],
     "SizeLimitHigh": 123,
     "SizeLimitLow": 123,
-    "ReplaceByFeeRatio": 12.3,
+    "ReplaceByFeeRatio": 1.23,
     "PruneCooldown": 60000000000,
     "GasLimitOverestimation": 12.3
   }
diff --git a/documentation/en/cli-lotus-miner.md b/documentation/en/cli-lotus-miner.md
index 82c9ba147..782441813 100644
--- a/documentation/en/cli-lotus-miner.md
+++ b/documentation/en/cli-lotus-miner.md
@@ -7,7 +7,7 @@ USAGE:
    lotus-miner [global options] command [command options] [arguments...]
 
 VERSION:
-   1.20.1
+   1.20.2
 
 COMMANDS:
    init     Initialize a lotus miner repo
diff --git a/documentation/en/cli-lotus-worker.md b/documentation/en/cli-lotus-worker.md
index 1673ba528..bf1fa68b0 100644
--- a/documentation/en/cli-lotus-worker.md
+++ b/documentation/en/cli-lotus-worker.md
@@ -7,7 +7,7 @@ USAGE:
    lotus-worker [global options] command [command options] [arguments...]
 
 VERSION:
-   1.20.1
+   1.20.2
 
 COMMANDS:
    run         Start lotus worker
diff --git a/documentation/en/cli-lotus.md b/documentation/en/cli-lotus.md
index e581d13cc..e9ff4a6ee 100644
--- a/documentation/en/cli-lotus.md
+++ b/documentation/en/cli-lotus.md
@@ -7,7 +7,7 @@ USAGE:
    lotus [global options] command [command options] [arguments...]
 
 VERSION:
-   1.20.1
+   1.20.2
 
 COMMANDS:
    daemon   Start a lotus daemon process
diff --git a/gateway/node.go b/gateway/node.go
index 90a6812b5..a97778eac 100644
--- a/gateway/node.go
+++ b/gateway/node.go
@@ -27,6 +27,7 @@ import (
 	_ "github.com/filecoin-project/lotus/lib/sigs/secp"
 	"github.com/filecoin-project/lotus/metrics"
 	"github.com/filecoin-project/lotus/node/impl/full"
+	"github.com/filecoin-project/lotus/node/modules/dtypes"
 )
 
 const (
@@ -59,18 +60,22 @@ type TargetAPI interface {
 	ChainPutObj(context.Context, blocks.Block) error
 	ChainGetGenesis(context.Context) (*types.TipSet, error)
 	GasEstimateMessageGas(ctx context.Context, msg *types.Message, spec *api.MessageSendSpec, tsk types.TipSetKey) (*types.Message, error)
+	MpoolGetNonce(ctx context.Context, addr address.Address) (uint64, error)
 	MpoolPushUntrusted(ctx context.Context, sm *types.SignedMessage) (cid.Cid, error)
 	MsigGetAvailableBalance(ctx context.Context, addr address.Address, tsk types.TipSetKey) (types.BigInt, error)
 	MsigGetVested(ctx context.Context, addr address.Address, start types.TipSetKey, end types.TipSetKey) (types.BigInt, error)
 	MsigGetVestingSchedule(context.Context, address.Address, types.TipSetKey) (api.MsigVesting, error)
 	MsigGetPending(ctx context.Context, addr address.Address, ts types.TipSetKey) ([]*api.MsigTransaction, error)
 	StateAccountKey(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error)
+	StateCall(ctx context.Context, msg *types.Message, tsk types.TipSetKey) (*api.InvocResult, error)
 	StateDealProviderCollateralBounds(ctx context.Context, size abi.PaddedPieceSize, verified bool, tsk types.TipSetKey) (api.DealCollateralBounds, error)
+	StateDecodeParams(ctx context.Context, toAddr address.Address, method abi.MethodNum, params []byte, tsk types.TipSetKey) (interface{}, error)
 	StateGetActor(ctx context.Context, actor address.Address, ts types.TipSetKey) (*types.Actor, error)
 	StateLookupID(ctx context.Context, addr address.Address, tsk types.TipSetKey) (address.Address, error)
 	StateListMiners(ctx context.Context, tsk types.TipSetKey) ([]address.Address, error)
 	StateMarketBalance(ctx context.Context, addr address.Address, tsk types.TipSetKey) (api.MarketBalance, error)
 	StateMarketStorageDeal(ctx context.Context, dealId abi.DealID, tsk types.TipSetKey) (*api.MarketDeal, error)
+	StateNetworkName(context.Context) (dtypes.NetworkName, error)
 	StateNetworkVersion(context.Context, types.TipSetKey) (network.Version, error)
 	StateSearchMsg(ctx context.Context, from types.TipSetKey, msg cid.Cid, limit abi.ChainEpoch, allowReplaced bool) (*api.MsgLookup, error)
 	StateWaitMsg(ctx context.Context, cid cid.Cid, confidence uint64, limit abi.ChainEpoch, allowReplaced bool) (*api.MsgLookup, error)
diff --git a/gateway/proxy_fil.go b/gateway/proxy_fil.go
index 1f6ee2ccc..bf6c2dff8 100644
--- a/gateway/proxy_fil.go
+++ b/gateway/proxy_fil.go
@@ -20,6 +20,7 @@ import (
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/lib/sigs"
+	"github.com/filecoin-project/lotus/node/modules/dtypes"
 )
 
 func (gw *Node) Discover(ctx context.Context) (apitypes.OpenRPCDocument, error) {
@@ -187,6 +188,13 @@ func (gw *Node) GasEstimateMessageGas(ctx context.Context, msg *types.Message, s
 	return gw.target.GasEstimateMessageGas(ctx, msg, spec, tsk)
 }
 
+func (gw *Node) MpoolGetNonce(ctx context.Context, addr address.Address) (uint64, error) {
+	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
+		return 0, err
+	}
+	return gw.target.MpoolGetNonce(ctx, addr)
+}
+
 func (gw *Node) MpoolPush(ctx context.Context, sm *types.SignedMessage) (cid.Cid, error) {
 	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
 		return cid.Cid{}, err
@@ -248,6 +256,16 @@ func (gw *Node) StateAccountKey(ctx context.Context, addr address.Address, tsk t
 	return gw.target.StateAccountKey(ctx, addr, tsk)
 }
 
+func (gw *Node) StateCall(ctx context.Context, msg *types.Message, tsk types.TipSetKey) (*api.InvocResult, error) {
+	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
+		return nil, err
+	}
+	if err := gw.checkTipsetKey(ctx, tsk); err != nil {
+		return nil, err
+	}
+	return gw.target.StateCall(ctx, msg, tsk)
+}
+
 func (gw *Node) StateDealProviderCollateralBounds(ctx context.Context, size abi.PaddedPieceSize, verified bool, tsk types.TipSetKey) (api.DealCollateralBounds, error) {
 	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
 		return api.DealCollateralBounds{}, err
@@ -258,6 +276,16 @@ func (gw *Node) StateDealProviderCollateralBounds(ctx context.Context, size abi.
 	return gw.target.StateDealProviderCollateralBounds(ctx, size, verified, tsk)
 }
 
+func (gw *Node) StateDecodeParams(ctx context.Context, toAddr address.Address, method abi.MethodNum, params []byte, tsk types.TipSetKey) (interface{}, error) {
+	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
+		return nil, err
+	}
+	if err := gw.checkTipsetKey(ctx, tsk); err != nil {
+		return nil, err
+	}
+	return gw.target.StateDecodeParams(ctx, toAddr, method, params, tsk)
+}
+
 func (gw *Node) StateGetActor(ctx context.Context, actor address.Address, tsk types.TipSetKey) (*types.Actor, error) {
 	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
 		return nil, err
@@ -308,6 +336,13 @@ func (gw *Node) StateMarketStorageDeal(ctx context.Context, dealId abi.DealID, t
 	return gw.target.StateMarketStorageDeal(ctx, dealId, tsk)
 }
 
+func (gw *Node) StateNetworkName(ctx context.Context) (dtypes.NetworkName, error) {
+	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
+		return *new(dtypes.NetworkName), err
+	}
+	return gw.target.StateNetworkName(ctx)
+}
+
 func (gw *Node) StateNetworkVersion(ctx context.Context, tsk types.TipSetKey) (network.Version, error) {
 	if err := gw.limit(ctx, stateRateLimitTokens); err != nil {
 		return network.VersionMax, err
diff --git a/itests/eth_block_hash_test.go b/itests/eth_block_hash_test.go
index ac6506bb2..7cc766ebc 100644
--- a/itests/eth_block_hash_test.go
+++ b/itests/eth_block_hash_test.go
@@ -3,6 +3,7 @@ package itests
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 	"time"
 
@@ -55,6 +56,10 @@ func TestEthBlockHashesCorrect_MultiBlockTipset(t *testing.T) {
 		hex := fmt.Sprintf("0x%x", i)
 
 		ethBlockA, err := n2.EthGetBlockByNumber(ctx, hex, true)
+		// Cannot use static ErrFullRound error for comparison since it gets reserialized as a JSON RPC error.
+		if err != nil && strings.Contains(err.Error(), "null round") {
+			continue
+		}
 		require.NoError(t, err)
 
 		ethBlockB, err := n2.EthGetBlockByHash(ctx, ethBlockA.Hash, true)
diff --git a/itests/eth_fee_history_test.go b/itests/eth_fee_history_test.go
index 72302f298..a792c7f0e 100644
--- a/itests/eth_fee_history_test.go
+++ b/itests/eth_fee_history_test.go
@@ -3,18 +3,42 @@ package itests
 import (
 	"context"
 	"encoding/json"
+	"sort"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/require"
 
 	"github.com/filecoin-project/go-jsonrpc"
+	"github.com/filecoin-project/go-state-types/abi"
 
+	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/types/ethtypes"
 	"github.com/filecoin-project/lotus/itests/kit"
 	"github.com/filecoin-project/lotus/lib/result"
+	"github.com/filecoin-project/lotus/node/impl/full"
 )
 
+// calculateExpectations calculates the expected number of items to be included in the response
+// of eth_feeHistory. It takes care of null rounds by finding the closet tipset with height
+// smaller than startHeight, and then looks back at requestAmount of items. It also considers
+// scenarios where there are not enough items to look back.
+func calculateExpectations(tsHeights []int, requestAmount, startHeight int) (count, oldestHeight int) {
+	latestIdx := sort.SearchInts(tsHeights, startHeight)
+	// SearchInts returns the index of the number that's larger than the target if the target
+	// doesn't exist. However, we're looking for the closet number that's smaller that the target
+	for tsHeights[latestIdx] > startHeight {
+		latestIdx--
+	}
+	cnt := requestAmount
+	oldestIdx := latestIdx - requestAmount + 1
+	if oldestIdx < 0 {
+		cnt = latestIdx + 1
+		oldestIdx = 0
+	}
+	return cnt, tsHeights[oldestIdx]
+}
+
 func TestEthFeeHistory(t *testing.T) {
 	require := require.New(t)
 
@@ -22,70 +46,136 @@ func TestEthFeeHistory(t *testing.T) {
 
 	blockTime := 100 * time.Millisecond
 	client, _, ens := kit.EnsembleMinimal(t, kit.MockProofs(), kit.ThroughRPC())
-	ens.InterconnectAll().BeginMining(blockTime)
 
 	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
 	defer cancel()
 
-	// Wait for the network to create 20 blocks
+	heads, err := client.ChainNotify(ctx)
+	require.NoError(err)
+
+	// Save the full view of the tipsets to calculate the answer when there are null rounds
+	tsHeights := []int{1}
+	go func() {
+		for chg := range heads {
+			for _, c := range chg {
+				tsHeights = append(tsHeights, int(c.Val.Height()))
+			}
+		}
+	}()
+
+	miner := ens.InterconnectAll().BeginMining(blockTime)
+
+	client.WaitTillChain(ctx, kit.HeightAtLeast(7))
+	miner[0].InjectNulls(abi.ChainEpoch(5))
+
+	// Wait for the network to create at least 20 tipsets
 	client.WaitTillChain(ctx, kit.HeightAtLeast(20))
+	for _, m := range miner {
+		m.Pause()
+	}
+
+	ch, err := client.ChainNotify(ctx)
+	require.NoError(err)
+
+	// Wait for 5 seconds of inactivity
+	func() {
+		for {
+			select {
+			case <-ch:
+				continue
+			case <-time.After(5 * time.Second):
+				return
+			}
+		}
+	}()
+
+	sort.Ints(tsHeights)
+
+	// because of the deferred execution, the last tipset is not executed yet,
+	// and the one before the last one is the last executed tipset,
+	// which corresponds to the "latest" tag in EthGetBlockByNumber
+	latestBlk := ethtypes.EthUint64(tsHeights[len(tsHeights)-2])
+	blk, err := client.EthGetBlockByNumber(ctx, "latest", false)
+	require.NoError(err)
+	require.Equal(blk.Number, latestBlk)
+
+	assertHistory := func(history *ethtypes.EthFeeHistory, requestAmount, startHeight int) {
+		amount, oldest := calculateExpectations(tsHeights, requestAmount, startHeight)
+		require.Equal(amount+1, len(history.BaseFeePerGas))
+		require.Equal(amount, len(history.GasUsedRatio))
+		require.Equal(ethtypes.EthUint64(oldest), history.OldestBlock)
+	}
 
 	history, err := client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{5, "0x10"}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(6, len(history.BaseFeePerGas))
-	require.Equal(5, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(16-5+1), history.OldestBlock)
+	assertHistory(&history, 5, 16)
 	require.Nil(history.Reward)
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{"5", "0x10"}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(6, len(history.BaseFeePerGas))
-	require.Equal(5, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(16-5+1), history.OldestBlock)
+	assertHistory(&history, 5, 16)
+	require.Nil(history.Reward)
+
+	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
+		json.Marshal([]interface{}{5, "latest"}),
+	).Assert(require.NoError))
+	require.NoError(err)
+	assertHistory(&history, 5, int(latestBlk))
 	require.Nil(history.Reward)
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{"0x10", "0x12"}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(17, len(history.BaseFeePerGas))
-	require.Equal(16, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(18-16+1), history.OldestBlock)
+	assertHistory(&history, 16, 18)
 	require.Nil(history.Reward)
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{5, "0x10"}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(6, len(history.BaseFeePerGas))
-	require.Equal(5, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(16-5+1), history.OldestBlock)
+	assertHistory(&history, 5, 16)
 	require.Nil(history.Reward)
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{5, "10"}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(6, len(history.BaseFeePerGas))
-	require.Equal(5, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(10-5+1), history.OldestBlock)
+	assertHistory(&history, 5, 10)
+	require.Nil(history.Reward)
+
+	// test when the requested number of blocks is longer than chain length
+	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
+		json.Marshal([]interface{}{"0x30", "latest"}),
+	).Assert(require.NoError))
+	require.NoError(err)
+	assertHistory(&history, 48, int(latestBlk))
+	require.Nil(history.Reward)
+
+	// test when the requested number of blocks is longer than chain length
+	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
+		json.Marshal([]interface{}{"0x30", "10"}),
+	).Assert(require.NoError))
+	require.NoError(err)
+	assertHistory(&history, 48, 10)
 	require.Nil(history.Reward)
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{5, "10", &[]float64{25, 50, 75}}),
 	).Assert(require.NoError))
 	require.NoError(err)
-	require.Equal(6, len(history.BaseFeePerGas))
-	require.Equal(5, len(history.GasUsedRatio))
-	require.Equal(ethtypes.EthUint64(10-5+1), history.OldestBlock)
+	assertHistory(&history, 5, 10)
 	require.NotNil(history.Reward)
 	require.Equal(5, len(*history.Reward))
 	for _, arr := range *history.Reward {
 		require.Equal(3, len(arr))
+		for _, item := range arr {
+			require.Equal(ethtypes.EthBigInt(types.NewInt(full.MinGasPremium)), item)
+		}
 	}
 
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
@@ -93,6 +183,11 @@ func TestEthFeeHistory(t *testing.T) {
 	).Assert(require.NoError))
 	require.Error(err)
 
+	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
+		json.Marshal([]interface{}{5, "10", &[]float64{75, 50}}),
+	).Assert(require.NoError))
+	require.Error(err)
+
 	history, err = client.EthFeeHistory(ctx, result.Wrap[jsonrpc.RawParams](
 		json.Marshal([]interface{}{5, "10", &[]float64{}}),
 	).Assert(require.NoError))
diff --git a/itests/eth_transactions_test.go b/itests/eth_transactions_test.go
index 9afeb7bd5..8d0df0433 100644
--- a/itests/eth_transactions_test.go
+++ b/itests/eth_transactions_test.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/store"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/types/ethtypes"
 	"github.com/filecoin-project/lotus/itests/kit"
@@ -270,6 +271,57 @@ func TestContractInvocation(t *testing.T) {
 	require.EqualValues(t, ethtypes.EthUint64(0x1), receipt.Status)
 }
 
+func TestGetBlockByNumber(t *testing.T) {
+	blockTime := 100 * time.Millisecond
+	client, _, ens := kit.EnsembleMinimal(t, kit.MockProofs(), kit.ThroughRPC())
+
+	bms := ens.InterconnectAll().BeginMining(blockTime)
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	// create a new Ethereum account
+	_, ethAddr, filAddr := client.EVM().NewAccount()
+	// send some funds to the f410 address
+	kit.SendFunds(ctx, t, client, filAddr, types.FromFil(10))
+
+	latest, err := client.EthBlockNumber(ctx)
+	require.NoError(t, err)
+
+	// can get the latest block
+	_, err = client.EthGetBlockByNumber(ctx, latest.Hex(), true)
+	require.NoError(t, err)
+
+	// fail to get a future block
+	_, err = client.EthGetBlockByNumber(ctx, (latest + 10000).Hex(), true)
+	require.Error(t, err)
+
+	// inject 10 null rounds
+	bms[0].InjectNulls(10)
+
+	// wait until we produce blocks again
+	tctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+	ch, err := client.ChainNotify(tctx)
+	require.NoError(t, err)
+	<-ch       // current
+	hc := <-ch // wait for next block
+	require.Equal(t, store.HCApply, hc[0].Type)
+
+	afterNullHeight := hc[0].Val.Height()
+
+	// Fail when trying to fetch a null round.
+	_, err = client.EthGetBlockByNumber(ctx, (ethtypes.EthUint64(afterNullHeight - 1)).Hex(), true)
+	require.Error(t, err)
+
+	// Fetch balance on a null round; should not fail and should return previous balance.
+	// Should be lower than original balance.
+	bal, err := client.EthGetBalance(ctx, ethAddr, (ethtypes.EthUint64(afterNullHeight - 1)).Hex())
+	require.NoError(t, err)
+	require.NotEqual(t, big.Zero(), bal)
+	require.Equal(t, types.FromFil(10).Int, bal.Int)
+}
+
 func deployContractTx(ctx context.Context, client *kit.TestFullNode, ethAddr ethtypes.EthAddress, contract []byte) (*ethtypes.EthTxArgs, error) {
 	gaslimit, err := client.EthEstimateGas(ctx, ethtypes.EthCall{
 		From: &ethAddr,
diff --git a/node/impl/full/eth.go b/node/impl/full/eth.go
index 907adf8cd..9b6794339 100644
--- a/node/impl/full/eth.go
+++ b/node/impl/full/eth.go
@@ -153,6 +153,8 @@ type EthAPI struct {
 	EthEventAPI
 }
 
+var ErrNullRound = errors.New("requested epoch was a null round")
+
 func (a *EthModule) StateNetworkName(ctx context.Context) (dtypes.NetworkName, error) {
 	return stmgr.GetNetworkName(ctx, a.StateManager, a.Chain.GetHeaviestTipSet().ParentState())
 }
@@ -231,7 +233,7 @@ func (a *EthModule) EthGetBlockByHash(ctx context.Context, blkHash ethtypes.EthH
 	return newEthBlockFromFilecoinTipSet(ctx, ts, fullTxInfo, a.Chain, a.StateAPI)
 }
 
-func (a *EthModule) parseBlkParam(ctx context.Context, blkParam string) (tipset *types.TipSet, err error) {
+func (a *EthModule) parseBlkParam(ctx context.Context, blkParam string, strict bool) (tipset *types.TipSet, err error) {
 	if blkParam == "earliest" {
 		return nil, fmt.Errorf("block param \"earliest\" is not supported")
 	}
@@ -252,16 +254,19 @@ func (a *EthModule) parseBlkParam(ctx context.Context, blkParam string) (tipset
 		if err != nil {
 			return nil, fmt.Errorf("cannot parse block number: %v", err)
 		}
-		ts, err := a.Chain.GetTipsetByHeight(ctx, abi.ChainEpoch(num), nil, false)
+		ts, err := a.Chain.GetTipsetByHeight(ctx, abi.ChainEpoch(num), nil, true)
 		if err != nil {
 			return nil, fmt.Errorf("cannot get tipset at height: %v", num)
 		}
+		if strict && ts.Height() != abi.ChainEpoch(num) {
+			return nil, ErrNullRound
+		}
 		return ts, nil
 	}
 }
 
 func (a *EthModule) EthGetBlockByNumber(ctx context.Context, blkParam string, fullTxInfo bool) (ethtypes.EthBlock, error) {
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, true)
 	if err != nil {
 		return ethtypes.EthBlock{}, err
 	}
@@ -367,7 +372,7 @@ func (a *EthModule) EthGetTransactionCount(ctx context.Context, sender ethtypes.
 		return ethtypes.EthUint64(0), nil
 	}
 
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, false)
 	if err != nil {
 		return ethtypes.EthUint64(0), xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
@@ -456,7 +461,7 @@ func (a *EthModule) EthGetCode(ctx context.Context, ethAddr ethtypes.EthAddress,
 		return nil, xerrors.Errorf("cannot get Filecoin address: %w", err)
 	}
 
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, false)
 	if err != nil {
 		return nil, xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
@@ -535,7 +540,7 @@ func (a *EthModule) EthGetCode(ctx context.Context, ethAddr ethtypes.EthAddress,
 }
 
 func (a *EthModule) EthGetStorageAt(ctx context.Context, ethAddr ethtypes.EthAddress, position ethtypes.EthBytes, blkParam string) (ethtypes.EthBytes, error) {
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, false)
 	if err != nil {
 		return nil, xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
@@ -631,7 +636,7 @@ func (a *EthModule) EthGetBalance(ctx context.Context, address ethtypes.EthAddre
 		return ethtypes.EthBigInt{}, err
 	}
 
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, false)
 	if err != nil {
 		return ethtypes.EthBigInt{}, xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
@@ -676,16 +681,12 @@ func (a *EthModule) EthFeeHistory(ctx context.Context, p jsonrpc.RawParams) (eth
 		}
 	}
 
-	ts, err := a.parseBlkParam(ctx, params.NewestBlkNum)
+	ts, err := a.parseBlkParam(ctx, params.NewestBlkNum, false)
 	if err != nil {
 		return ethtypes.EthFeeHistory{}, fmt.Errorf("bad block parameter %s: %s", params.NewestBlkNum, err)
 	}
 
-	// Deal with the case that the chain is shorter than the number of requested blocks.
 	oldestBlkHeight := uint64(1)
-	if abi.ChainEpoch(params.BlkCount) <= ts.Height() {
-		oldestBlkHeight = uint64(ts.Height()) - uint64(params.BlkCount) + 1
-	}
 
 	// NOTE: baseFeePerGas should include the next block after the newest of the returned range,
 	//  because the next base fee can be inferred from the messages in the newest block.
@@ -695,29 +696,32 @@ func (a *EthModule) EthFeeHistory(ctx context.Context, p jsonrpc.RawParams) (eth
 	gasUsedRatioArray := []float64{}
 	rewardsArray := make([][]ethtypes.EthBigInt, 0)
 
-	for ts.Height() >= abi.ChainEpoch(oldestBlkHeight) {
-		// Unfortunately we need to rebuild the full message view so we can
-		// totalize gas used in the tipset.
-		msgs, err := a.Chain.MessagesForTipset(ctx, ts)
+	blocksIncluded := 0
+	for blocksIncluded < int(params.BlkCount) && ts.Height() > 0 {
+		compOutput, err := a.StateCompute(ctx, ts.Height(), nil, ts.Key())
 		if err != nil {
-			return ethtypes.EthFeeHistory{}, xerrors.Errorf("error loading messages for tipset: %v: %w", ts, err)
+			return ethtypes.EthFeeHistory{}, xerrors.Errorf("cannot lookup the status of tipset: %v: %w", ts, err)
 		}
 
 		txGasRewards := gasRewardSorter{}
-		for txIdx, msg := range msgs {
-			msgLookup, err := a.StateAPI.StateSearchMsg(ctx, types.EmptyTSK, msg.Cid(), api.LookbackNoLimit, false)
-			if err != nil || msgLookup == nil {
-				return ethtypes.EthFeeHistory{}, nil
+		for _, msg := range compOutput.Trace {
+			if msg.Msg.From == builtintypes.SystemActorAddr {
+				continue
 			}
 
-			tx, err := newEthTxFromMessageLookup(ctx, msgLookup, txIdx, a.Chain, a.StateAPI)
+			smsgCid, err := getSignedMessage(ctx, a.Chain, msg.MsgCid)
 			if err != nil {
-				return ethtypes.EthFeeHistory{}, nil
+				return ethtypes.EthFeeHistory{}, xerrors.Errorf("failed to get signed msg %s: %w", msg.MsgCid, err)
+			}
+
+			tx, err := newEthTxFromSignedMessage(ctx, smsgCid, a.StateAPI)
+			if err != nil {
+				return ethtypes.EthFeeHistory{}, err
 			}
 
 			txGasRewards = append(txGasRewards, gasRewardTuple{
 				reward: tx.Reward(ts.Blocks()[0].ParentBaseFee),
-				gas:    uint64(msgLookup.Receipt.GasUsed),
+				gas:    uint64(msg.MsgRct.GasUsed),
 			})
 		}
 
@@ -727,6 +731,8 @@ func (a *EthModule) EthFeeHistory(ctx context.Context, p jsonrpc.RawParams) (eth
 		baseFeeArray = append(baseFeeArray, ethtypes.EthBigInt(ts.Blocks()[0].ParentBaseFee))
 		gasUsedRatioArray = append(gasUsedRatioArray, float64(totalGasUsed)/float64(build.BlockGasLimit))
 		rewardsArray = append(rewardsArray, rewards)
+		oldestBlkHeight = uint64(ts.Height())
+		blocksIncluded++
 
 		parentTsKey := ts.Parents()
 		ts, err = a.Chain.LoadTipSet(ctx, parentTsKey)
@@ -1066,7 +1072,7 @@ func (a *EthModule) EthCall(ctx context.Context, tx ethtypes.EthCall, blkParam s
 		return nil, xerrors.Errorf("failed to convert ethcall to filecoin message: %w", err)
 	}
 
-	ts, err := a.parseBlkParam(ctx, blkParam)
+	ts, err := a.parseBlkParam(ctx, blkParam, false)
 	if err != nil {
 		return nil, xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
@@ -1796,12 +1802,16 @@ func newEthBlockFromFilecoinTipSet(ctx context.Context, ts *types.TipSet, fullTx
 		return ethtypes.EthBlock{}, xerrors.Errorf("failed to compute state: %w", err)
 	}
 
-	for txIdx, msg := range compOutput.Trace {
+	txIdx := 0
+	for _, msg := range compOutput.Trace {
 		// skip system messages like reward application and cron
 		if msg.Msg.From == builtintypes.SystemActorAddr {
 			continue
 		}
 
+		ti := ethtypes.EthUint64(txIdx)
+		txIdx++
+
 		gasUsed += msg.MsgRct.GasUsed
 		smsgCid, err := getSignedMessage(ctx, cs, msg.MsgCid)
 		if err != nil {
@@ -1812,8 +1822,6 @@ func newEthBlockFromFilecoinTipSet(ctx context.Context, ts *types.TipSet, fullTx
 			return ethtypes.EthBlock{}, xerrors.Errorf("failed to convert msg to ethTx: %w", err)
 		}
 
-		ti := ethtypes.EthUint64(txIdx)
-
 		tx.ChainID = ethtypes.EthUint64(build.Eip155ChainId)
 		tx.BlockHash = &blkHash
 		tx.BlockNumber = &bn
@@ -2343,7 +2351,7 @@ func calculateRewardsAndGasUsed(rewardPercentiles []float64, txGasRewards gasRew
 
 	rewards := make([]ethtypes.EthBigInt, len(rewardPercentiles))
 	for i := range rewards {
-		rewards[i] = ethtypes.EthBigIntZero
+		rewards[i] = ethtypes.EthBigInt(types.NewInt(MinGasPremium))
 	}
 
 	if len(txGasRewards) == 0 {
diff --git a/node/impl/full/eth_test.go b/node/impl/full/eth_test.go
index 67a8b0500..4cf3b5c76 100644
--- a/node/impl/full/eth_test.go
+++ b/node/impl/full/eth_test.go
@@ -135,7 +135,7 @@ func TestRewardPercentiles(t *testing.T) {
 		{
 			percentiles:  []float64{25, 50, 75},
 			txGasRewards: []gasRewardTuple{},
-			answer:       []int64{0, 0, 0},
+			answer:       []int64{MinGasPremium, MinGasPremium, MinGasPremium},
 		},
 		{
 			percentiles: []float64{25, 50, 75, 100},