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VAT Number Validation API
x402
VAT Number Validation API is a paid API for AI agents from gateway.apiosk.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Validates a VAT (Value Added Tax) number, returning its validity, associated country, and checksum correctness
Price / call$0.02
Success—
StatusUnknown
How this service works
Validate an EU VAT number with per-country syntax and available offline checksum algorithms.
Output
Returns a JSON object indicating whether the VAT number is valid (ok, valid flags), the two-letter ISO country code the VAT number belongs to (e.g. 'NL' for Netherlands), and whether the checksum is mathematically valid (checksum_valid).
Example use cases
Verify supplier VAT before payment
“I'm about to send an invoice to a new vendor with VAT number DE123456789. Can you check if that VAT ID is actually valid and from Germany before I proceed?”
Validate customer EU tax IDs
“We're onboarding a batch of B2B customers across Europe. Can you quickly validate their VAT numbers — FR12345678901, IT12345678901, and ES12345678901 — so I know which ones are legitimate for tax purposes?”
Check VAT registration authenticity
“Someone's claiming to be a registered business in Belgium with VAT number BE0123456789. Can you verify if that's a real, properly formatted VAT number and whether the checksum is correct?”
Technical details
Endpoint
POSThttps://gateway.apiosk.com/financial-identifiers/validate/vatWhen to prefer
Use this endpoint when you need to validate a VAT number for invoicing, B2B onboarding, or tax compliance purposes and want both structural (checksum) and country-level verification in a single call. Prefer this over manual regex checks when you need authoritative checksum validation across multiple EU country formats.
Side effects
- Invalid or malformed VAT string returns valid:false with checksum_valid:false
- Unsupported country prefix may result in unknown country field or error
- Empty or missing vat field causes request validation error
- Network or gateway timeout returns HTTP 5xx
Tags
x402
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