hcrb.in

Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum.

Price per call: $0.005
Chain: Base
Method: POST
Paid calls · 30 days: 2

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://hcrb.in/v1/tools/isbn-check/call", { method: "POST" });
console.log(await res.json());

https://hcrb.in/v1/tools/isbn-check/call