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Strale VAT Number Format Validator
x402
Strale VAT Number Format Validator is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-09-15).
Validates the format of a VAT number (including country prefix) against country-specific rules for 27+ countries
Price / call$0.0216
Success—
StatusUnknown
How this service works
The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.
Output
Returns whether the provided VAT number is valid according to the format rules for the indicated country prefix, along with an audit record containing a cryptographic chain hash for traceability.
Example use cases
Pre-invoice VAT validation
“Before I send this invoice to our German supplier, check that their VAT number DE812345678 is in the right format.”
E-commerce checkout compliance
“A customer just entered GB123456789 as their VAT number at checkout — is that a valid UK VAT number format?”
Bulk supplier onboarding check
“We're onboarding a new vendor from France and they gave us FR40303265045 as their VAT number — can you verify it's correctly formatted?”
Technical details
Endpoint
GEThttps://api.strale.io/x402/v2/vat-format-validateWhen to prefer
Choose this endpoint when you need a fast, auditable, format-level VAT number check across 27+ countries without needing real-time registry lookup. Ideal for pre-invoice validation, supplier onboarding, and compliance workflows where you need a cryptographic audit trail of each check. Prefer over manual regex validation or unaudited validators when tamper-evident records matter.
Side effects
- Missing or malformed vat_number parameter returns a validation error
- Unsupported country prefix returns an error indicating the country is not covered
- Purely syntactic/format check — does not confirm the number is registered with a tax authority
- Network timeout or service unavailability returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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