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eth_createAccessList

Creates an EIP-2930 access list that you can include in a transaction.

Use this method to optimize your smart contract interactions. Access lists are a part of Ethereum's EIP-2930, which aims to improve the network's scalability and reduce gas costs by specifying an explicit list of addresses and storage keys that a transaction intends to access.

Optimizing Ethereum Transactions

See the Infura article Optimizing Ethereum Transactions with eth_createAccessList that describes how eth_createAccessList can help optimize gas costs, reduce out-of-gas errors, and verify clients for infrastructure access.

Parameters​

  • Transaction call object: [Required]
    • from: [optional] 20 bytes. The address of the sender.
    • to: 20 bytes. Address the transaction is directed to.
    • gas: [optional] Hexadecimal value of the gas provided for the transaction execution.
    • gasPrice: [optional] Hexadecimal value gas price, in wei, provided by the sender. The default is 0. Used only in non-EIP-1559 transactions.
    • maxPriorityFeePerGas: [optional] Maximum fee, in wei, the sender is willing to pay per gas above the base fee. See EIP-1559 transactions. If used, must specify maxFeePerGas.
    • maxFeePerGas: [optional] Maximum total fee (base fee + priority fee), in wei, the sender is willing to pay per gas. See EIP-1559 transactions. If used, must specify maxPriorityFeePerGas.
    • value: [optional] Hexadecimal of the value transferred, in wei.
    • data: [optional] Hash of the method signature and encoded parameters. See Ethereum contract ABI specification.
  • block number or block hash: [required] A string representing a block number, block hash, or one of the string tags latest, earliest, pending, safe, or finalized. See the default block parameter.

Returns​

Access list object with the following fields:

  • accessList: A list of objects with the following fields:
    • address: Addresses to be accessed by the transaction.
    • storageKeys: Storage keys to be accessed by the transaction.
  • gasUsed: A hexadecimal string representing the approximate gas cost for the transaction if the access list is included.

Example​

Replace <YOUR-API-KEY> with an API key from your MetaMask Developer dashboard.

Request​

curl https://arbitrum-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "eth_createAccessList", "params": [{"from": "0xaeA8F8f781326bfE6A7683C2BD48Dd6AA4d3Ba63", "data": "0x608060806080608155"}, "pending"], "id": 1}'

Response​

{
  "accessList": [
    {
      "address": "0xa02457e5dfd32bda5fc7e1f1b008aa5979568150",
      "storageKeys": [
        "0x0000000000000000000000000000000000000000000000000000000000000081",
      ]
    }
  ]
  "gasUsed": "0x125f8"
}