TariffMonkee

Citation check: takes a claim and a cited source (URL or DOI) and returns supported, contradicted or not_addressed with the verbatim passage as evidence. The source is fetched with a full browser render. Dead, paywalled or PDF-only sources return source_unavailable, never a false contradicted.

Open endpoint ↗

Price per call: $0.03
Chain: Base
Method: GET
Paid calls · 30 days: 1

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://tariffmonkee.com/paid/verify-citation", { method: "GET" });
console.log(await res.json());

https://tariffmonkee.com/paid/verify-citation