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VAT Number Format Validator (EU + GB/CH/NO)
x402
VAT Number Format Validator (EU + GB/CH/NO) is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-10-12).
Validates a European VAT number's format against country-specific algorithmic rules for all 27 EU member states plus GB, CH, and NO — without checking VIES.
Price / call$0.0216
Success—
StatusUnknown
How this service works
Validate a European VAT number format against country-specific rules. Pure algorithmic — does NOT check VIES. Use vat-validate for full VIES verification. Supports all 27 EU countries + GB, CH, NO.
Output
Returns whether the VAT number matches the expected format for its country prefix, along with the detected country code and any format-specific validation details. Does not perform live VIES registry verification.
Example use cases
Example prompt
“Can you check whether this VAT number is correctly formatted: SE556703748501? I just need a format check, not a VIES lookup.”
Technical details
Endpoint
GEThttps://api.strale.io/x402/vat-format-validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, offline format validation of a VAT number before submitting invoices or forms, or when you want to pre-screen VAT numbers without consuming VIES quota. Prefer this over vat-validate when you only need structural/algorithmic checks, not live VIES registry confirmation.
Side effects
- Missing or malformed vat_number parameter — returns 400 bad request
- Unrecognized country prefix — returns error indicating unsupported country
- VAT number with no country prefix — validation cannot be performed
- Network timeout or service unavailable — returns 5xx error
Input
{
"vat_number": "SE556703748501"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"note": "Format is valid. Use vat-validate for full VIES verification.",
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.0216,
"settlement_id": "0x4ef58f15c84604815abe94b4a8befb74cf51c28fe20040e26726e5271acf59c0"
},
"capability": "vat-format-validate",
"latency_ms": 0,
"provenance": {
"source": "algorithmic",
"fetched_at": "2026-06-13T04:24:06.554Z"
}
},
"valid": true,
"vat_number": "SE556703748501",
"country_code": "SE",
"country_name": "Sweden",
"format_valid": true,
"expected_format": "SE123456789012"
}Tags
x402
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