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Usaref Tax ID / VAT Number Validator (North America)
x402
Usaref Tax ID / VAT Number Validator (North America) is a paid API for AI agents from usaref.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Validates and normalises Tax IDs and VAT numbers for North American countries using official format rules and check-digit algorithms, returning validity, normalised form, ID type, and failure reason
Price / call$0.003
Success—
StatusUnknown
How this service works
Tax-ID / VAT-number validation for North American countries: valid/invalid, normalised form, id type and the reason it failed. Format plus the official check-digit algorithm where the tax authority publishes one; every rule cited to an official source with its date. Pure algorithmic, no registry lookup
Output
Returns a JSON object containing: a boolean validity flag, the normalised form of the tax ID, the detected ID type (e.g. EIN, SSN, BN, RFC), and if invalid, a human-readable reason explaining which format rule or check-digit algorithm failed, with citations to official sources
Example use cases
Pre-invoice vendor tax ID check
“Before I add this vendor to our system, can you validate their US EIN '98-7654321' and tell me if it's a real, correctly formatted tax ID?”
Onboarding Canadian business number
“We're onboarding a Canadian supplier who gave us BN '123456789 RT0001' — can you check if that's a valid Canadian business number format?”
Bulk payment form validation
“A customer just entered '845 123 456' as their Mexican RFC tax ID — does it pass the official format check, and what's the normalised form I should store?”
Technical details
Endpoint
GEThttps://usaref.dev/v1/taxid/validate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, pure-algorithmic Tax ID or VAT number validation for North American countries (US, Canada, Mexico, and others in the coverage list) that does not require a live registry lookup. It is ideal for pre-validation in onboarding flows, invoice processing, or compliance checks where you need the normalised ID form, type classification, and an official-source-cited reason for any failure. Prefer this over EU VAT validation services for North American tax IDs specifically.
Side effects
- Missing required 'country' or 'id' query parameter returns 400 error
- Unsupported or non-North-American country code returns coverage error or 400
- Malformed ID string that cannot be parsed returns invalid with reason
- Country code not in /v1/taxid/coverage list returns unsupported country error
- Network timeout or service unavailability returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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