x402 Dev Tools

Decodes a PAYMENT-REQUIRED, PAYMENT-SIGNATURE or PAYMENT-RESPONSE header (x402 v2, or X-PAYMENT / X-PAYMENT-RESPONSE of v1), base64 or JSON, detecting which it is. Explains it in plain terms (price in dollars, network, payer and payee, validity window, explorer link) and lists problems: wrong USDC EIP-712 domain, expired or not-yet-valid authorizations, amount or payee mismatches, missing Bazaar e

Open endpoint ↗

Price per call: $0.002
Chain: Base
Method: POST
Paid calls · 30 days: 7

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://dev.kagurazaka.dev/v1/decode", { method: "POST" });
console.log(await res.json());

https://dev.kagurazaka.dev/v1/decode