> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validationcloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# eth_createAccessList

Returns an [EIP-2930](https://eips.ethereum.org/EIPS/eip-2930) access list that you can include in a transaction. You can use this method to optimize your smart contract interactions.

This method will use `20` [Compute Units](/nodeapi/about/billing.md).

***

> [!NOTE]
>
> Mantle Mainnet keeps historical state for the last 128 blocks, about 4 minutes at Mantle's 2-second block time. Requests for an older block return JSON-RPC error `-32000` with a message that contains `historical state <root> is not available`.

## **Parameters**

1. `Object` - The transaction call object

`from` - \[optional] String of the address the transaction is sent from.

`to` - \[optional] String of the address the transaction is directed to. Omit it for a contract creation.

`gas` - \[optional] Integer of the gas provided for the transaction execution encoded as a hexadecimal.

`gasPrice` - \[optional] Integer of the gasPrice used for each paid gas encoded as a hexadecimal.

`value` - \[optional] Integer of the value sent with this transaction encoded as a hexadecimal.

`data` - \[optional] String of the hash of the method signature and encoded parameters. For more information, see the [Contract ABI description in the Solidity documentation](https://docs.soliditylang.org/en/latest/abi-spec.html).

2. `QUANTITY | TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://ethereum.org/en/developers/docs/apis/json-rpc/#default-block-parameter)

## Returns

`Object` with the following fields:

* `accessList`: A list of objects, one per account the transaction touches:
  * `address`: Address accessed by the transaction.
  * `storageKeys`: Storage keys accessed at that address.
* `gasUsed`: A hexadecimal string representing the approximate gas cost for the transaction if the access list is included.

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "accessList": [
      {
        "address": "0x78c1b0c915c4faa5fffa6cabf0219da63d7f4cb8",
        "storageKeys": [
          "0x0000000000000000000000000000000000000000000000000000000000000002"
        ]
      }
    ],
    "gasUsed": "0x645a"
  }
}
```

```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
curl https://mainnet.mantle.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_createAccessList","params":[{"from":"0xe7cac669cc341bae5edda780538d2dcd5ba37bdc","to":"0x78c1b0c915c4faa5fffa6cabf0219da63d7f4cb8","data":"0x18160ddd"},"latest"],"id":1}'
```


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