alloy-eips 2.0.1

Ethereum Improvement Proprosal (EIP) implementations
Documentation 
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use alloy_primitives::U256;

/// The default Ethereum block gas limit: 30M
pub const ETHEREUM_BLOCK_GAS_LIMIT_30M: u64 = 30_000_000;

/// The default Ethereum block gas limit: 36M
pub const ETHEREUM_BLOCK_GAS_LIMIT_36M: u64 = 36_000_000;

/// The bound divisor of the gas limit, used in update calculations.
pub const GAS_LIMIT_BOUND_DIVISOR: u64 = 1024;

/// The minimum tx fee below which the txpool will reject the transaction.
///
/// Configured to `7` WEI which is the lowest possible value of base fee under mainnet EIP-1559
/// parameters. `BASE_FEE_MAX_CHANGE_DENOMINATOR` <https://eips.ethereum.org/EIPS/eip-1559>
/// is `8`, or 12.5%. Once the base fee has dropped to `7` WEI it cannot decrease further because
/// 12.5% of 7 is less than 1.
///
/// Note that min base fee under different 1559 parameterizations may differ, but there's no
/// significant harm in leaving this setting as is.
pub const MIN_PROTOCOL_BASE_FEE: u64 = 7;

/// Same as [MIN_PROTOCOL_BASE_FEE] but as a U256.
pub const MIN_PROTOCOL_BASE_FEE_U256: U256 = U256::from_limbs([7u64, 0, 0, 0]);

/// Initial base fee as defined in [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559)
pub const INITIAL_BASE_FEE: u64 = 1_000_000_000;

/// Base fee max change denominator as defined in [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559)
pub const DEFAULT_BASE_FEE_MAX_CHANGE_DENOMINATOR: u64 = 8;

/// Elasticity multiplier as defined in [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559)
pub const DEFAULT_ELASTICITY_MULTIPLIER: u64 = 2;

/// Base fee max change denominator for Optimism Sepolia as defined in the Optimism
/// [transaction costs](https://docs.optimism.io/stack/differences#transactions) doc.
pub(crate) const OP_SEPOLIA_EIP1559_DEFAULT_BASE_FEE_MAX_CHANGE_DENOMINATOR: u128 = 50;

/// Base fee max change denominator for Optimism Sepolia as defined in the Optimism Canyon hardfork.
pub(crate) const OP_SEPOLIA_EIP1559_BASE_FEE_MAX_CHANGE_DENOMINATOR_CANYON: u128 = 250;

/// Base fee max change denominator for Optimism Sepolia as defined in the Optimism
/// [transaction costs](https://docs.optimism.io/stack/differences#transactions) doc.
pub(crate) const OP_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 6;

/// Base fee max change denominator for Optimism Mainnet as defined in the Optimism
/// [transaction costs](https://docs.optimism.io/stack/differences#transactions) doc.
pub(crate) const OP_MAINNET_EIP1559_DEFAULT_BASE_FEE_MAX_CHANGE_DENOMINATOR: u128 = 50;

/// Base fee max change denominator for Optimism Mainnet as defined in the Optimism Canyon hardfork.
pub(crate) const OP_MAINNET_EIP1559_BASE_FEE_MAX_CHANGE_DENOMINATOR_CANYON: u128 = 250;

/// Base fee max change denominator for Optimism Mainnet as defined in the Optimism
/// [transaction costs](https://docs.optimism.io/stack/differences#transactions) doc.
pub(crate) const OP_MAINNET_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 6;

/// Base fee max change denominator for Base Sepolia as defined in the Optimism
/// [transaction costs](https://docs.optimism.io/stack/differences#transactions) doc.
pub(crate) const BASE_SEPOLIA_EIP1559_DEFAULT_ELASTICITY_MULTIPLIER: u128 = 10;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn min_protocol_sanity() {
        assert_eq!(MIN_PROTOCOL_BASE_FEE_U256.to::<u64>(), MIN_PROTOCOL_BASE_FEE);
    }
}