x402 quote

Probe any URL and decode its HTTP 402 payment requirements (price, asset, network, pay-to) into clean JSON — what an agent needs to decide whether/how to pay. Read-only; does not pay. ?url=https://api.example.com/paid&method=GET

Input

Field	Type	Description
url *	string	URL of the paid resource to probe
method	string	HTTP method to probe with (default GET)

Example output

{
  "url": "https://api.example.com/paid",
  "status": 402,
  "paymentRequired": true,
  "accepts": [
    {
      "scheme": "exact",
      "network": "base",
      "asset": "USDC",
      "maxAmountRequired": "1000",
      "payTo": "0x…"
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/x402-quote?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fhash&method=POST"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/x402-quote?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fhash&method=POST");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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