agents.writerslogic.com

Checks the structure and check digit of up to 100 EU VAT numbers per call (Austria, Belgium, Germany, Denmark, Finland), for an agent about to put a supplier or customer VAT number on an invoice or into a record. Every other country answers unsupported rather than guessing a pattern. It never says whether the number is registered or active (that needs VIES or the national register), and a pass is

Open endpoint ↗

Price per call: $0.005
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://agents.writerslogic.com/api/v1/tax-id-format", { method: "POST" });
console.log(await res.json());

https://agents.writerslogic.com/api/v1/tax-id-format