feat: update next_block_base_fee for BSC

crates/consensus/Cargo.toml

@@ -56,6 +56,7 @@ serde_json.workspace = true
 tokio = { workspace = true, features = ["macros"] }
 
 [features]
+bsc = []
 default = ["std"]
 std = ["alloy-eips/std", "c-kzg?/std"]
 k256 = ["alloy-primitives/k256", "alloy-eips/k256"]

crates/consensus/src/header.rs

@@ -21,6 +21,14 @@ pub const EMPTY_OMMER_ROOT_HASH: B256 =
 pub const EMPTY_ROOT_HASH: B256 =
     b256!("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421");
 
+/// Initial base fee as defined in [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559)
+#[cfg(not(feature = "bsc"))]
+pub(crate) const EIP1559_INITIAL_BASE_FEE: u64 = 1_000_000_000;
+
+/// Initial base fee of bsc
+#[cfg(feature = "bsc")]
+pub(crate) const EIP1559_INITIAL_BASE_FEE: u64 = 0;
+
 /// Ethereum Block header
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
@@ -221,12 +229,16 @@ impl Header {
     ///
     /// Returns a `None` if no base fee is set, no EIP-1559 support
     pub fn next_block_base_fee(&self, base_fee_params: BaseFeeParams) -> Option<u64> {
-        Some(calc_next_block_base_fee(
-            self.gas_used,
-            self.gas_limit,
-            self.base_fee_per_gas?,
-            base_fee_params,
-        ))
+        if cfg!(feature = "bsc") {
+            Some(EIP1559_INITIAL_BASE_FEE)
+        } else {
+            Some(calc_next_block_base_fee(
+                self.gas_used,
+                self.gas_limit,
+                self.base_fee_per_gas?,
+                base_fee_params,
+            ))
+        }
     }
 
     /// Calculate excess blob gas for the next block according to the EIP-4844