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Toll402 Austrian VAT Number Validator
x402
Toll402 Austrian VAT Number Validator is a paid API for AI agents from toll402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates an Austrian UID/VAT number (format ATU + 8 digits) offline using format normalization and weighted modulo-10 check digit verification
Price / call$0.001
Success—
StatusUnknown
How this service works
Offline validator for an Austrian UID (VAT) number: format ATU followed by 8 digits. Normalizes input, checks structure and verifies the weighted modulo-10 check digit algorithm (weights 1,2,1,2,1,2,1 on the first 7 digits, digit-sum reduction, check = (10-(sum+4)%10)%10).
Output
Returns whether the provided UID string is a valid Austrian VAT number, including whether it passes format normalization (ATU prefix + 8 digits) and the weighted modulo-10 check digit algorithm (weights 1,2,1,2,1,2,1 on first 7 digits, check digit verified as (10-(sum+4)%10)%10).
Example use cases
Invoice VAT number verification
“Before I send this invoice to my Austrian client, can you verify that their VAT number ATU68468603 is correctly formatted and passes the check digit?”
E-commerce checkout tax ID validation
“A customer entered ATU99887760 as their Austrian UID during checkout — can you confirm whether that's a valid Austrian VAT number?”
B2B onboarding compliance check
“We're onboarding a new Austrian supplier and they gave us ATU56789012 as their tax ID — can you validate that it's a properly structured Austrian UID with a valid check digit?”
Technical details
Endpoint
POSThttps://toll402.dev/v1/t/vat_at_validateWhen to prefer
Use this endpoint when you need fast, offline, zero-latency validation of Austrian UID/VAT numbers without making external calls to Austrian tax authority APIs. Ideal for pre-submission checks, form validation, onboarding flows, and invoice processing where you only need structural and check-digit correctness rather than live government database confirmation.
Side effects
- Missing or malformed uid field returns validation error
- UID with wrong prefix (not ATU) fails format check
- UID with wrong digit count fails structure check
- UID with correct format but invalid check digit returns invalid result
- Empty string input returns error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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