From c0fc5e0bda7f14f6c29231b5f1b1a1be2245f9b7 Mon Sep 17 00:00:00 2001
From: Sina M <1591639+s1na@users.noreply.github.com>
Date: Tue, 26 May 2026 09:36:28 +0200
Subject: [PATCH] internal/ethapi: fix base fee too low error code in
 eth_simulateV1 (#34951)

Fixes the issue discovered in
https://github.com/NethermindEth/nethermind/issues/11412.
---
 internal/ethapi/errors.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/internal/ethapi/errors.go b/internal/ethapi/errors.go
index cc79af6f3c..392bf86cf4 100644
--- a/internal/ethapi/errors.go
+++ b/internal/ethapi/errors.go
@@ -102,6 +102,7 @@ func (e *invalidTxError) ErrorCode() int { return e.Code }
 const (
 	errCodeNonceTooHigh            = -38011
 	errCodeNonceTooLow             = -38010
+	errCodeBaseFeeTooLow           = -38012
 	errCodeIntrinsicGas            = -38013
 	errCodeInsufficientFunds       = -38014
 	errCodeBlockGasLimitReached    = -38015
@@ -134,7 +135,7 @@ func txValidationError(err error) *invalidTxError {
 	case errors.Is(err, core.ErrTipAboveFeeCap):
 		return &invalidTxError{Message: err.Error(), Code: errCodeInvalidParams}
 	case errors.Is(err, core.ErrFeeCapTooLow):
-		return &invalidTxError{Message: err.Error(), Code: errCodeInvalidParams}
+		return &invalidTxError{Message: err.Error(), Code: errCodeBaseFeeTooLow}
 	case errors.Is(err, core.ErrInsufficientFunds):
 		return &invalidTxError{Message: err.Error(), Code: errCodeInsufficientFunds}
 	case errors.Is(err, core.ErrIntrinsicGas):