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EU VAT Number Format Validator
x402
EU VAT Number Format Validator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).
Validates the format of EU VAT numbers for all member states, with Spanish check digit verification, without querying VIES.
Price / call$0.003
Success—
StatusUnknown
How this service works
EU VAT number format validation for all member states (plus Spanish check digit). Does not query VIES.
Output
Returns a JSON object with: a boolean 'valid' (overall result), 'valid_format' (format check result), 'valid_control_digit' (check digit result, especially relevant for Spanish VAT), the normalized 'number', the detected 'country' code (ISO 2-letter), and a 'note' clarifying that this is a format-only check and does not confirm VIES registration.
Example use cases
E-commerce checkout VAT validation
“Before I finalize this B2B order, can you verify that the VAT number the customer entered — DE811234567 — is correctly formatted for Germany?”
Supplier onboarding compliance check
“We just received a new Spanish supplier's tax ID: ESB12345674. Can you confirm whether the format is valid and whether the check digit checks out?”
Bulk invoice pre-flight validation
“I'm about to generate invoices for a French client using VAT number FR83404833048 — can you quickly check that the format is correct before I send them out?”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/eu-vat-validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, offline-style EU VAT format validation without triggering a VIES database lookup — ideal for real-time checkout flows, form validation, or pre-screening supplier VAT numbers before a full VIES query. It is especially valuable when you need Spanish check digit verification. Choose VIES-querying services instead when you need to confirm that the number is actually registered and active.
Side effects
- Invalid or missing country prefix returns invalid format result
- Malformed JSON body or missing 'number' field causes request error
- Unsupported or non-EU VAT prefix may return null or invalid
- Number with correct format but wrong check digit returns valid_format=true, valid_control_digit=false
- Network timeout or service unavailability returns HTTP error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| number | string | VAT number with country prefix, e.g. ESB12345674 |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Format validation (and check digit for ES). It does not confirm the number is registered in VIES.",
"valid": true,
"number": "ESB12345674",
"country": "ES",
"valid_format": true,
"valid_control_digit": true
}
}Tags
x402
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