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AT VAT Number Checksum Validator
x402
AT VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-29).
Validates the checksum of an Austrian VAT (UID) number without performing a live registry lookup
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs whether a AT VAT checksum is valid. No registry lookup. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-vat-at first.
Output
Returns whether the provided Austrian VAT number passes its checksum algorithm, indicating structural validity. Does not confirm the number is registered with Austrian tax authorities — only that the check digit arithmetic is correct.
Example use cases
E-commerce checkout AT VAT validation
“Before we process this B2B order, can you verify that the Austrian VAT number the customer entered — ATU68000875 — has a valid checksum so we don't store a malformed tax ID?”
Bulk invoice data cleansing
“I have an Austrian supplier's VAT number ATU36246202 on their invoice — can you confirm the checksum is correct before I add it to our accounting system?”
Registration form pre-submission check
“A user just entered ATU99999999 as their Austrian UID number in our sign-up form — can you do a quick checksum validation to see if it's structurally valid before they submit?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-at?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.01 USDC) offline checksum check of an Austrian VAT number before storing or transmitting it, and do not need to confirm the number is actively registered in the Austrian tax authority registry. Ideal for form validation, data cleansing, and pre-processing steps. Try the free sandbox endpoint POST /v1/sandbox/check-vat-at first if available.
Side effects
- Invalid or missing input value returns an error
- Non-Austrian VAT numbers (wrong prefix or format) may return invalid
- Empty string or whitespace input rejected due to minLength:1 constraint
- Malformed request body returns a client error
- Network timeout if the service is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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