RPC method

eth_createAccessList on Core

Supported on SwiftNodes

Measured 2026-10-11 by our weekly probe, which calls eth_createAccessList through the same Core endpoint customers use.

What eth_createAccessList does

Simulates a transaction and returns the EIP-2930 access list of addresses and storage keys it touches, plus the gas it would use with that list attached.

eth_createAccessList on Core: what we measured

Default Core routing keeps state for roughly the last 1,000,000 blocks (about 34.7 days of Core history). Simulating against a block older than that needs historical state. Add &archive=1 to send the request to archive upstreams (paid plans).

Example request

curl -s https://rpc.swiftnodes.io/rpc/core?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_createAccessList","params":[{"from":"0x0000000000000000000000000000000000000000","to":"0x0000000000000000000000000000000000000000","data":"0x"},"latest"]}'

import { createPublicClient, http } from "viem";

const client = createPublicClient({ transport: http("https://rpc.swiftnodes.io/rpc/core?key=YOUR_API_KEY") });

// Any JSON-RPC method, typed loosely: eth_createAccessList on Core
const result = await client.request({
  method: "eth_createAccessList",
  params: [{"from":"0x0000000000000000000000000000000000000000","to":"0x0000000000000000000000000000000000000000","data":"0x"},"latest"],
});

Other methods on Core

eth_createAccessList on other chains

Support differs by chain; the full measured table is on the eth_createAccessList reference.

Frequently asked questions

Does Core support eth_createAccessList?

Yes. eth_createAccessList answered correctly on the SwiftNodes Core endpoint in our weekly method probe (2026-10-11), which sends real requests through the customer path.

Are there limits on eth_createAccessList on Core?

Default Core routing keeps state for roughly the last 1,000,000 blocks (about 34.7 days of Core history). Simulating against a block older than that needs historical state. Add &archive=1 to send the request to archive upstreams (paid plans).

Core endpoints, live block height and WebSocket status are on the Core RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.