diff --git a/CHANGELOG.md b/CHANGELOG.md
index faa6094f23..8dd5ffe745 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -79,6 +79,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 - (evm) [#405](https://github.com/crypto-org-chain/ethermint/pull/405) Avoid duplicate cache events emitted from evm hooks.
 - (rpc) [#406](https://github.com/crypto-org-chain/ethermint/pull/406) Align filter rule for eth_getLogs when toBlock is newer than latest or extract error occurs.
 - (rpc) [#409](https://github.com/crypto-org-chain/ethermint/pull/409) Fix nextBaseFee in eth_feeHistory before fee market param change.
+- (rpc) [#425](https://github.com/crypto-org-chain/ethermint/pull/425) Avoid Int64() out of bound error in gas related api.
 
 ### Improvements
 
diff --git a/rpc/backend/backend.go b/rpc/backend/backend.go
index a9d39d9256..9f7e65ccc6 100644
--- a/rpc/backend/backend.go
+++ b/rpc/backend/backend.go
@@ -71,7 +71,7 @@ type EVMBackend interface {
 	RPCGasCap() uint64            // global gas cap for eth_call over rpc: DoS protection
 	RPCEVMTimeout() time.Duration // global timeout for eth_call over rpc: DoS protection
 	RPCTxFeeCap() float64         // RPCTxFeeCap is the global transaction fee(price * gaslimit) cap for send-transaction variants. The unit is ether.
-	RPCMinGasPrice() int64
+	RPCMinGasPrice() *big.Int
 
 	// Sign Tx
 	Sign(address common.Address, data hexutil.Bytes) (hexutil.Bytes, error)
diff --git a/rpc/backend/call_tx.go b/rpc/backend/call_tx.go
index 01c3e71f14..c97e1ce5d1 100644
--- a/rpc/backend/call_tx.go
+++ b/rpc/backend/call_tx.go
@@ -432,7 +432,7 @@ func (b *Backend) GasPrice() (*hexutil.Big, error) {
 		}
 		result = result.Add(result, head.BaseFee)
 	} else {
-		result = big.NewInt(b.RPCMinGasPrice())
+		result = b.RPCMinGasPrice()
 	}
 
 	// return at least GlobalMinGasPrice from FeeMarket module
diff --git a/rpc/backend/node_info.go b/rpc/backend/node_info.go
index 2737c84a2c..14972ab3e0 100644
--- a/rpc/backend/node_info.go
+++ b/rpc/backend/node_info.go
@@ -338,17 +338,17 @@ func (b *Backend) RPCBlockRangeCap() int32 {
 // RPCMinGasPrice returns the minimum gas price for a transaction obtained from
 // the node config. If set value is 0, it will default to 20.
 
-func (b *Backend) RPCMinGasPrice() int64 {
+func (b *Backend) RPCMinGasPrice() *big.Int {
 	evmParams, err := b.queryClient.Params(b.ctx, &evmtypes.QueryParamsRequest{})
 	if err != nil {
-		return ethermint.DefaultGasPrice
+		return new(big.Int).SetInt64(ethermint.DefaultGasPrice)
 	}
 
 	minGasPrice := b.cfg.GetMinGasPrices()
-	amt := minGasPrice.AmountOf(evmParams.Params.EvmDenom).TruncateInt64()
-	if amt == 0 {
-		return ethermint.DefaultGasPrice
+	amt := minGasPrice.AmountOf(evmParams.Params.EvmDenom).TruncateInt()
+	if amt.IsZero() {
+		return new(big.Int).SetInt64(ethermint.DefaultGasPrice)
 	}
 
-	return amt
+	return amt.BigInt()
 }
diff --git a/rpc/backend/node_info_test.go b/rpc/backend/node_info_test.go
index 56f1551c3e..1210670f08 100644
--- a/rpc/backend/node_info_test.go
+++ b/rpc/backend/node_info_test.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math/big"
 
+	"cosmossdk.io/math"
 	tmrpcclient "github.com/cometbft/cometbft/rpc/client"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
@@ -17,10 +18,12 @@ import (
 )
 
 func (suite *BackendTestSuite) TestRPCMinGasPrice() {
+	defaultPrice := new(big.Int).SetInt64(ethermint.DefaultGasPrice)
+	bigPrice, _ := new(big.Int).SetString("18446744073709551616", 10)
 	testCases := []struct {
 		name           string
 		registerMock   func()
-		expMinGasPrice int64
+		expMinGasPrice *big.Int
 		expPass        bool
 	}{
 		{
@@ -29,7 +32,7 @@ func (suite *BackendTestSuite) TestRPCMinGasPrice() {
 				queryClient := suite.backend.queryClient.QueryClient.(*mocks.EVMQueryClient)
 				RegisterParamsWithoutHeaderError(queryClient, 1)
 			},
-			ethermint.DefaultGasPrice,
+			defaultPrice,
 			true,
 		},
 		{
@@ -38,7 +41,18 @@ func (suite *BackendTestSuite) TestRPCMinGasPrice() {
 				queryClient := suite.backend.queryClient.QueryClient.(*mocks.EVMQueryClient)
 				RegisterParamsWithoutHeader(queryClient, 1)
 			},
-			ethermint.DefaultGasPrice,
+			defaultPrice,
+			true,
+		},
+		{
+			"pass - min gas price exceeds math.MaxUint64",
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.EVMQueryClient)
+				RegisterParamsWithoutHeader(queryClient, 1)
+				amt, _ := math.NewIntFromString("18446744073709551616")
+				suite.backend.cfg.SetMinGasPrices([]sdk.DecCoin{sdk.NewDecCoin(ethermint.AttoPhoton, amt)})
+			},
+			bigPrice,
 			true,
 		},
 	}