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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
eth_createAccessList
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_createAccessList",
  "id": 1,
  "params": [
    {
      "from": "0xaeA8F8f781326bfE6A7683C2BD48Dd6AA4d3Ba63",
      "data": "0x608060806080608155"
    },
    "pending"
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {
    "accessList": [
      {
        "address": "<string>",
        "storageKeys": [
          "<string>"
        ]
      }
    ],
    "gasUsed": "<string>"
  }
}
Optimism API method eth_createAccessList generates an access list for a transaction based on specific default values. An access list includes addresses and storage keys the transaction intends to access, facilitating more efficient gas usage.
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​
Parameters

  • transactionObject — an object containing transaction parameters with default values:
    • from — the address of the sender.
    • data — the data being sent with the transaction.
  • blockParameter — specifies the blockchain state to use for generating the access list, with a default value of "pending".

​
Response

  • result — an object containing:
    • accessList — the generated access list, detailing addresses and storage keys the transaction will access.
    • gasUsed — the estimated gas used to execute the transaction with the generated access list.

​
Use case

The eth_createAccessList method is crucial for:
  • Preparing transactions that optimize gas usage by explicitly stating which addresses and storage keys will be accessed.
  • Developers aiming to reduce transaction costs and improve efficiency on the Optimism network.
  • Transactions that comply with EIP-2930, which introduces access lists as a transaction type to specify state access.
This method provides a practical approach to optimizing transaction execution and gas usage on the Optimism blockchain by pre-determining the access list.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_createAccessList
​
id
integer
default:1
​
params
(object | string)[]

Response

200 - application/json

The generated access list and gas used

​
jsonrpc
string
​
id
integer
​
result
object
Last modified on August 7, 2025