Skill: Validator suite

Bundled execution of the Validator suite workflow — Validate common identifiers in one call: ISBN (book), IBAN (bank account), and credit card number (Luhn check). One x402 payment runs 3 underlying tools (isbn-validate, iban-validate, card-validate); partial-success per step.

Input

Field	Type	Description
iban *	string	IBAN to validate (e.g. DE89370400440532013000)
number	string	Credit card number to validate (e.g. 4242424242424242)

Example output

{
  "pack": "validator-suite",
  "args": {
    "iban": "DE89370400440532013000",
    "number": "4242424242424242"
  },
  "steps": [
    {
      "slug": "isbn-validate",
      "ok": true,
      "result": {}
    },
    {
      "slug": "iban-validate",
      "ok": true,
      "result": {}
    },
    {
      "slug": "card-validate",
      "ok": true,
      "result": {}
    }
  ],
  "summary": "3/3 steps succeeded"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/skill/validator-suite \
  -H "Content-Type: application/json" \
  -d '{"iban":"DE89370400440532013000","number":"4242424242424242"}'

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/skill/validator-suite", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "iban": "DE89370400440532013000",
    "number": "4242424242424242"
  }),
});

No wallet? Pay with compute

This is a pure-CPU tool, so an agent without a wallet can pay with proof-of-work instead of USDC: fetch a challenge, solve the sha256 puzzle (16 leading zero bits — a fraction of a second of CPU, no money, no AI tokens), and resend with the X-Pow-Solution header.

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=skill-validator-suite")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/skill/validator-suite", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"iban":"DE89370400440532013000","number":"4242424242424242"}) });

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