Keccak-256 hash

Use when an agent is building something Ethereum will hash and must get the same digest the chain gets: Keccak-256 of any string or hex payload, with the byte count. It is NOT SHA3-256, and that confusion is the usual reason a selector or a CREATE2 address comes out wrong. Do not use for file digests or API signatures outside Ethereum (/v1/util/sha256) or for a function selector, which is already

Open endpoint ↗

Price per call: $0.005
Chain: Base
Method: GET
Paid calls · 30 days: 3

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://flat-rate-llm.kikoribera03.workers.dev/v1/util/keccak256", { method: "GET" });
console.log(await res.json());

https://flat-rate-llm.kikoribera03.workers.dev/v1/util/keccak256