EU VAT Number Validation (VIES)

Validate an EU VAT identification number live against the official EU VIES service, with registered company name and address where the member state discloses them. Checks the national format first. Not charged if the member state service is temporarily unavailable. Params: vat_number (with country prefix, e.g. NL004495445B01, DE811569869) or vat_number + country_code.

Run free trial ↗3 free calls per day with the example input. Paid: $0.003 USDC, no limit.

Call it

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

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agentsvc.io/api/v1/proxy/vat-validate", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({"vat_number":"NL004495445B01"}),
});
const { data, payment } = await res.json();  // payment.transaction = on-chain receipt

Input

Field	Type	Description
vat_number *	string	VAT number, ideally with EU country prefix
country_code	string	Two-letter EU code if the number has no prefix (EL for Greece, XI for Northern Ireland)

Output

Field	Type	Description
valid	boolean
format_valid	boolean
country_code	string
vat_number	string
full_vat_number	string
name	string
address	string
source	string
checked_at	string

Example response (data)

{
  "valid": true,
  "format_valid": true,
  "country_code": "NL",
  "vat_number": "004495445B01",
  "full_vat_number": "NL004495445B01",
  "name": "OPENJONGERENVERENIGING DE KOORNBEURS",
  "address": "VOLDERSGRACHT 00001, 2611ET DELFT",
  "source": "EU VIES",
  "checked_at": "2026-10-06T14:17:43.626Z"
}