x402-json-compat-check

Catch a breaking schema change before it reaches production: post one {schema, actual} JSON pair and get a compatibility report with an RFC 6901 JSON Pointer to every mismatch, the keyword that failed and the expected vs actual value. One POST, one report, supported keywords only, no upstream call. A purchase is two calls by design: this first call returns 402 with the price and the payment terms,

Open endpoint ↗

Price per call: $0.02
Chain: Base
Method: POST
Paid calls · 30 days: 0

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://x402-catalog-history.ai-business-surface.workers.dev/compat", { method: "POST" });
console.log(await res.json());

https://x402-catalog-history.ai-business-surface.workers.dev/compat