This EIP charges access lists for their data footprint, preventing the circumvention of the EIP-7623 floor pricing. This effectively reduces the worst-case block size by ~21% with minimal impact on users.
Access lists are only priced for storage but not for their data.
Furthermore, access lists can circumvent the EIP-7623 floor pricing by contributing to EVM gas while still leaving a non-negligible data footprint. This enables achieving the maximal possible block size by combining access lists with calldata at a certain ratio.
| Parameter | Value | Source |
|---|---|---|
ACCESS_LIST_ADDRESS_COST | 2400 | EIP-2930 |
ACCESS_LIST_STORAGE_KEY_COST | 1900 | EIP-2930 |
TOTAL_COST_FLOOR_PER_TOKEN | 10 | EIP-7623 |
Let access_list_nonzero_bytes and access_list_zero_bytes be the count of non-zero and zero bytes respectively in the addresses (20 bytes each) and storage keys (32 bytes each) contained within the access list.
Let tokens_in_access_list = access_list_zero_bytes + access_list_nonzero_bytes * 4.
The access list cost formula changes from EIP-2930 to include data cost:
The EIP-7623 floor calculation is modified to include access list tokens:
The gas used calculation becomes:
Any transaction with a gas limit below 21000 + TOTAL_COST_FLOOR_PER_TOKEN * total_data_tokens or below its intrinsic gas cost is considered invalid.
Access list data is always charged at floor rate (added to access_list_cost), and access list tokens are included in the floor calculation. This ensures:
This is a backwards incompatible gas repricing that requires a scheduled network upgrade.
Requires updates to gas estimation in wallets and nodes. Normal usage patterns remain largely unaffected.
This EIP closes a loophole that allows circumventing EIP-7623 floor pricing. Without this fix, attackers can achieve larger blocks than intended by combining access lists with calldata. All transaction data sources now contribute to the floor calculation consistently.
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