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POST
/
eth_createAccessList
curl --request POST \
  --url https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/ \
  --header 'Content-Type: application/json' \
  --data '{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_createAccessList",
  "params": [
    {
      "to": "0x0000000000000000000000000000000000000000",
      "data": "0x"
    },
    "latest"
  ]
}'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {}
}
Monad API method that creates an EIP-2930 access list for a transaction. This method returns a list of addresses and storage keys that the transaction will access, which can be used to reduce gas costs for subsequent executions.
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Parameters

  • object — the transaction call object:
    • from (optional) — address the transaction is sent from
    • to — address the transaction is directed to
    • gas (optional) — gas provided for the call
    • gasPrice (optional) — gas price for the call
    • value (optional) — value sent with the call
    • data (optional) — hash of the method signature and encoded parameters
  • quantity|tag — the block number as a hexadecimal string, or block tag (latest, earliest, pending).

​
Response

  • result — an object containing:
    • accessList — array of access list entries, each with:
      • address — the address that will be accessed
      • storageKeys — array of storage keys that will be accessed
    • gasUsed — the estimated gas used with the access list

​
eth_createAccessList code examples

const { ethers } = require("ethers");

const provider = new ethers.JsonRpcProvider("CHAINSTACK_NODE_URL");

async function createAccessList() {
  const tx = {
    to: "0x...", // Contract address
    data: "0x..." // Encoded function call
  };

  const result = await provider.send("eth_createAccessList", [tx, "latest"]);
  console.log("Access list:", result.accessList);
  console.log(`Estimated gas: ${parseInt(result.gasUsed, 16)}`);
}

createAccessList();

​
Use case

A practical use case for eth_createAccessList is optimizing gas costs for complex smart contract interactions by pre-declaring the state that will be accessed, which reduces the cold access gas penalties introduced in EIP-2929.

Body

application/json
​
id
integer
default:1
​
jsonrpc
string
default:2.0
​
method
string
default:eth_createAccessList
​
params
any[]

Response

200 - application/json

The access list and estimated gas.

​
jsonrpc
string
​
id
integer
​
result
object