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fix: support EIP-1559 params configuration for Optimism dev mode #21855

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Merged
mattsse merged 2 commits into from
Feb 5, 2026
Merged

fix: support EIP-1559 params configuration for Optimism dev mode #21855

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eb62c5f
fix: support EIP-1559 params configuration for Optimism dev mode
xzav3r Feb 5, 2026
71be244
docs: add comments for EIP-1559 parameter configuration in dev mode
xzav3r Feb 5, 2026
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30 changes: 26 additions & 4 deletions crates/engine/local/src/payload.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,9 @@ where
&self,
parent: &SealedHeader<ChainSpec::Header>,
) -> op_alloy_rpc_types_engine::OpPayloadAttributes {
use alloy_primitives::B64;
use reth_chainspec::BaseFeeParams;
use std::env;
/// Dummy system transaction for dev mode.
/// OP Mainnet transaction at index 0 in block 124665056.
///
Expand All @@ -80,14 +83,33 @@ where
"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"
);

// Configure EIP-1559 parameters for dev mode. These can be overridden via environment
// variables (OP_DEV_EIP1559_DENOMINATOR, OP_DEV_EIP1559_ELASTICITY, OP_DEV_GAS_LIMIT),
// otherwise defaults from Optimism's BaseFeeParams are used. The parameters are encoded
// as an 8-byte value (denominator + elasticity) required by Optimism's Jovian fork.
let default_eip_1559_params = BaseFeeParams::optimism();
let denominator = env::var("OP_DEV_EIP1559_DENOMINATOR")
.ok()
.and_then(|v| v.parse::<u32>().ok())
.unwrap_or(default_eip_1559_params.max_change_denominator as u32);
let elasticity = env::var("OP_DEV_EIP1559_ELASTICITY")
.ok()
.and_then(|v| v.parse::<u32>().ok())
.unwrap_or(default_eip_1559_params.elasticity_multiplier as u32);
let gas_limit = env::var("OP_DEV_GAS_LIMIT").ok().and_then(|v| v.parse::<u64>().ok());

let mut eip1559_bytes = [0u8; 8];
eip1559_bytes[0..4].copy_from_slice(&denominator.to_be_bytes());
eip1559_bytes[4..8].copy_from_slice(&elasticity.to_be_bytes());
let eip_1559_params = Some(B64::from(eip1559_bytes));

op_alloy_rpc_types_engine::OpPayloadAttributes {
payload_attributes: self.build(parent),
// Add dummy system transaction
transactions: Some(vec![TX_SET_L1_BLOCK_OP_MAINNET_BLOCK_124665056.into()]),
no_tx_pool: None,
gas_limit: None,
eip_1559_params: None,
min_base_fee: None,
gas_limit,
eip_1559_params,
min_base_fee: Some(0),
}
}
}
1 change: 1 addition & 0 deletions crates/ethereum/hardforks/src/hardforks/dev.rs
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Expand Up @@ -35,5 +35,6 @@ pub static DEV_HARDFORKS: LazyLock<ChainHardforks> = LazyLock::new(|| {
(EthereumHardfork::Shanghai.boxed(), ForkCondition::Timestamp(0)),
(EthereumHardfork::Cancun.boxed(), ForkCondition::Timestamp(0)),
(EthereumHardfork::Prague.boxed(), ForkCondition::Timestamp(0)),
(EthereumHardfork::Osaka.boxed(), ForkCondition::Timestamp(0)),
])
});
8 changes: 8 additions & 0 deletions crates/optimism/chainspec/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -512,6 +512,14 @@ pub fn make_op_genesis_header(genesis: &Genesis, hardforks: &ChainHardforks) ->
})));
}

// If Jovian is active at genesis, encode the base fee parameters in extra_data
if hardforks.fork(OpHardfork::Jovian).active_at_timestamp(header.timestamp) {
use op_alloy_consensus::encode_jovian_extra_data;
// Encode with empty nonce (8 zero bytes)
header.extra_data =
encode_jovian_extra_data([0u8; 8].into(), BaseFeeParams::optimism(), 0).unwrap();
}

header
}

Expand Down
3 changes: 1 addition & 2 deletions crates/optimism/hardforks/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,6 @@ use reth_ethereum_forks::{ChainHardforks, EthereumHardfork, ForkCondition, Hardf

/// Dev hardforks
pub static DEV_HARDFORKS: LazyLock<ChainHardforks> = LazyLock::new(|| {
const JOVIAN_TIMESTAMP: ForkCondition = ForkCondition::Timestamp(1761840000);
ChainHardforks::new(vec![
(EthereumHardfork::Frontier.boxed(), ForkCondition::Block(0)),
(EthereumHardfork::Homestead.boxed(), ForkCondition::Block(0)),
Expand Down Expand Up @@ -64,7 +63,7 @@ pub static DEV_HARDFORKS: LazyLock<ChainHardforks> = LazyLock::new(|| {
(OpHardfork::Holocene.boxed(), ForkCondition::Timestamp(0)),
(EthereumHardfork::Prague.boxed(), ForkCondition::Timestamp(0)),
(OpHardfork::Isthmus.boxed(), ForkCondition::Timestamp(0)),
(OpHardfork::Jovian.boxed(), JOVIAN_TIMESTAMP),
(OpHardfork::Jovian.boxed(), ForkCondition::Timestamp(0)),
])
});

Expand Down
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