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EU VAT Number Format & Checksum Validator
x402
EU VAT Number Format & Checksum Validator is a paid API for AI agents from x402-test.crewofthecaptain.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Validates the format and checksum of a European Union VAT number string, returning validity status and normalized form.
Price / call$0.001
Success—
StatusUnknown
How this service works
Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
Output
Returns a JSON object with: 'type' (always 'eu-vat'), 'valid' (boolean indicating pass/fail), 'reason' (a short string explaining the result, e.g. 'ok' or an error description), and 'normalized' (the canonically formatted VAT number string).
Example use cases
Pre-invoice VAT validation for B2B sales
“Before I send this invoice to our German client, can you verify that their VAT number 'DE811428181' is valid and correctly formatted?”
Bulk onboarding compliance check
“We're onboarding a new supplier from France — can you validate their VAT number 'FR40303265045' to make sure it's legitimate before we add them to our system?”
E-commerce checkout VAT verification
“A customer entered 'PL5213003153' as their VAT number at checkout — is it a valid Polish VAT number with the right format and checksum?”
Technical details
Endpoint
POSThttps://x402-test.crewofthecaptain.com/api/validate/eu-vat?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need to validate EU VAT numbers with format and checksum verification at very low cost ($0.001/call). It is ideal for pay-per-use B2B invoicing pipelines, onboarding flows, or e-commerce checkout validation where you need lightweight, programmatic VAT validation without subscribing to a heavier tax API. It also belongs to a family of sibling validators (IBAN, PESEL, NIP, REGON, email) on the same platform, so it pairs well if you need multi-format validation in one integration.
Side effects
- Invalid or unsupported country prefix returns valid:false with reason explaining the issue
- Malformed input (wrong character types) returns valid:false
- Empty or missing 'value' field may return a validation error
- VAT numbers from non-EU countries may be rejected or return valid:false
- Checksum mismatch returns valid:false with reason 'checksum failed'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | string |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "eu-vat",
"valid": true,
"reason": "ok",
"normalized": "…"
}
}Tags
x402
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