From 90cd7d1937f279514ec0c4250c116688fef011f2 Mon Sep 17 00:00:00 2001
From: cui <cuiweixie@gmail.com>
Date: Wed, 27 May 2026 18:53:03 +0800
Subject: [PATCH] eth: should return basefee for the next block as doc says
 (#35023)

---
 eth/api_backend.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/eth/api_backend.go b/eth/api_backend.go
index 7d3b5d483e..d527d4756e 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -446,8 +446,10 @@ func (b *EthAPIBackend) FeeHistory(ctx context.Context, blockCount uint64, lastB
 }
 
 func (b *EthAPIBackend) BaseFee(ctx context.Context) *big.Int {
-	if b.ChainConfig().IsLondon(b.CurrentHeader().Number) {
-		return eip1559.CalcBaseFee(b.ChainConfig(), b.CurrentHeader())
+	header := b.CurrentHeader()
+	next := new(big.Int).Add(header.Number, common.Big1)
+	if b.ChainConfig().IsLondon(next) {
+		return eip1559.CalcBaseFee(b.ChainConfig(), header)
 	}
 	return nil
 }