ToolVet
75trust / 100

Vat

by agents.factstamp.dev in Markets & finance

x402 APIPassing, checked 1 h ago

An EU VAT number check — VAT validity, and the VAT registration behind it. Relevant wherever a VAT number is being relied on or cited: the check reads the official VIES service (European Commission), keyless, and returns valid, invalid or unknown — an outage is never reported as invalid — with the member state, the register's own request date, and the trader identity only where that member state discloses it. GB is out of scope after Brexit; XI (Northern Ireland) is covered. Not tax advice.

POST
https://agents.factstamp.dev/vat
Price
$0.05
per call in USDC
Uptime
100%
last 30 days
Response time
431 ms
588 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agents.factstamp.dev/vat

Each call costs $0.05 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agents.factstamp.dev/vat
content-type: application/json

{
  "country_code": "IE",
  "vat_number": "6388047V"
}

Example response

The provider's example. We can't check it without paying.

Example response, 45 lines
{
  "check": {
    "isValid": true,
    "userError": "VALID",
    "vat_number": "6388047V"
  },
  "country": {
    "code": "IE",
    "in_vies": true,
    "name": "Ireland"
  },
  "coverage": {
    "complete": true,
    "consulted": [
      "vies"
    ],
    "not_consulted": []
  },
  "query": {
    "country_code": "IE",
    "vat_number": "6388047V"
  },
  "receipt": {
    "alg": "Ed25519",
    "key_id": "2331751858f5e3b1"
  },
  "receipt_url": "https://factstamp.agentrails.workers.dev/r/c41e77b2aa90d613",
  "scope": "in_scope",
  "source": {
    "consultation_number": {
      "available": false
    },
    "licence": "CC BY 4.0 (European Commission reuse policy, Decision 2011/833/EU)",
    "member_state_code": "IE",
    "request_date": "2026-10-07T07:40:59.315Z",
    "source": "VIES (European Commission)"
  },
  "tool": "check_vat",
  "trader": {
    "address": "3RD FLOOR, GORDON HOUSE, BARROW STREET, DUBLIN 4",
    "identity_disclosed": true,
    "name": "GOOGLE IRELAND LIMITED"
  },
  "verdict": "valid"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.05.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agents.factstamp.dev/vat' \
  -H 'content-type: application/json' \
  --data-raw '{"country_code":"IE","vat_number":"6388047V"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://agents.factstamp.dev/vat' \
  -H 'content-type: application/json' \
  --data-raw '{"country_code":"IE","vat_number":"6388047V"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagents.factstamp.dev%2Fvat&method=POST
const res = await pay("https://agents.factstamp.dev/vat", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "country_code": "IE",
    "vat_number": "6388047V"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agents.factstamp.dev/vat",
        json={
            "country_code": "IE",
            "vat_number": "6388047V",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402473 ms$0.05
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20 h agoPassed402387 ms$0.05
Show 4 older checks
25 h agoPassed402420 ms$0.05
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33 h agoPassed402380 ms$0.05
43 h agoPassed402588 ms$0.05