> ## 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).

***

## **Parameters**

1. `Object` - The transaction call object

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

`to` - String of the address the transaction is directed to.

`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

`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.

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
	"jsonrpc": "2.0",
	"result": {
		"accessList": [
			{
				"address": "0xa66e8368c0e8033a4bb27536a79730c5242377c1",
				"storageKeys": [
					"0x0000000000000000000000000000000000000000000000000000000000000081"
				]
			}
		],
		"gasUsed": "0x12e92"
	},
	"id": 1
}
```

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"method":"eth_createAccessList","params":[{"from":"0xbeb6CC93B5822482eB077173ec3de783900c94D5","data":"0x608060806080608155"}, "pending"],"id":1,"jsonrpc":"2.0"}'
  ```

  ```bash title="testnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://sepolia.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"method":"eth_createAccessList","params":[{"from":"0xbeb6CC93B5822482eB077173ec3de783900c94D5","data":"0x608060806080608155"}, "pending"],"id":1,"jsonrpc":"2.0"}'
  ```
</CodeGroup>


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