From a513da9394e28fd27146cc99fe171dc45cccb0a9 Mon Sep 17 00:00:00 2001
From: Kevin Yang <5478483+k-yang@users.noreply.github.com>
Date: Mon, 18 Nov 2024 11:33:40 -0500
Subject: [PATCH] fix(evm): make conditional balance check free in gas cost

---
 x/evm/keeper/bank_extension.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/x/evm/keeper/bank_extension.go b/x/evm/keeper/bank_extension.go
index da5221cbb..cb94ccc59 100644
--- a/x/evm/keeper/bank_extension.go
+++ b/x/evm/keeper/bank_extension.go
@@ -1,6 +1,7 @@
 package keeper
 
 import (
+	storetypes "github.com/cosmos/cosmos-sdk/store/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	auth "github.com/cosmos/cosmos-sdk/x/auth/types"
 	bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
@@ -84,6 +85,14 @@ func (bk *NibiruBankKeeper) SyncStateDBWithAccount(
 	if bk.StateDB == nil {
 		return
 	}
+
+	cachedGasConfig := ctx.KVGasConfig()
+	defer func() {
+		ctx = ctx.WithKVGasConfig(cachedGasConfig)
+	}()
+
+	// set gas cost to zero for this conditional operation
+	ctx = ctx.WithKVGasConfig(storetypes.GasConfig{})
 	balanceWei := evm.NativeToWei(
 		bk.GetBalance(ctx, acc, evm.EVMBankDenom).Amount.BigInt(),
 	)