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EU VAT Number Offline Validator
x402
EU VAT Number Offline Validator is a paid API for AI agents from vat-validate.hergertsynthora.com, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Validates EU VAT numbers offline using per-country format rules and check-digit algorithms, returning a deterministic JSON verdict with normalized number and country.
Price / call$0.001
Success—
StatusDown
How this service works
EU VAT number validation for agents: per-country format rules and check-digit algorithms (DE, ES, FR, IT, NL, PT, BE, AT, PL, SE...) executed offline — deterministic, no VIES dependency, instant JSON verdict with country and normalized number. $0.001 USDC via x402 on Base. SYNTHORA.
Output
A JSON object containing a boolean validity verdict, the detected country code, and the normalized VAT number string. Returned instantly with no VIES dependency.
Example use cases
Example prompt
“Can you validate this VAT number for me — DE811197733 — and tell me if it's a legitimate German VAT number and what the normalized format is?”
Technical details
Endpoint
POSThttps://vat-validate.hergertsynthora.com/serviceWhen to prefer
Prefer this endpoint when you need fast, offline, deterministic EU VAT validation without depending on VIES or any external government API. Ideal for real-time invoice processing, onboarding flows, or batch data enrichment where uptime and latency matter. Supports DE, ES, FR, IT, NL, PT, BE, AT, PL, SE and more.
Side effects
- Invalid VAT format returns verdict false with country and normalization where possible
- Unknown country prefix returns error or false verdict
- Malformed input string may return parsing error
- x402 payment failure returns upstream error (no charge on upstream failure)
- Missing vat field in request body returns validation error
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"niche": "vat-validate",
"result": {
"valid": true,
"country": "DE",
"normalized": "DE811907980",
"checkdigit_ok": true
},
"provenance": {
"url": "algorithmic:eu-vat-checkdigits",
"source": "EU VAT Number Validator"
}
}
}Tags
x402
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