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Hungarian VAT Number Checksum Validator
x402
Hungarian VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-29).
Validates whether a Hungarian VAT number has a valid checksum, with no external registry lookup.
Price / call$0.008
Success—
StatusUnknown
How this service works
Call when an agent needs whether a HU VAT checksum is valid. No registry lookup. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-vat-hu first.
Output
Returns whether the provided Hungarian VAT number string passes the official HU VAT checksum algorithm — a boolean validity result with no external registry or live database consulted.
Example use cases
Invoice VAT number pre-check
“Before I send this invoice to a Hungarian supplier, can you verify the VAT number '12345678-2-11' has a valid HU checksum?”
E-commerce checkout validation
“A customer entered '98765432-1-42' as their Hungarian VAT number — can you confirm the checksum is mathematically valid before we proceed?”
Batch data cleanup screening
“I'm cleaning up our vendor database — can you tell me if the HU VAT number '11111111-3-00' passes the Hungarian checksum algorithm?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-hu?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, deterministic, offline checksum validation of a Hungarian VAT number without triggering a live government registry lookup. Ideal for pre-validation in forms, invoice processing pipelines, or data cleaning workflows where speed and cost matter more than live registry confirmation. Try the free sandbox endpoint (/v1/sandbox/check-vat-hu) before paying.
Side effects
- Empty or missing VAT number string returns validation error
- VAT number exceeding 20000 characters rejected
- Malformed input schema causes 400 error
- Payment of $0.008 USDC required; unpaid requests should use /v1/sandbox/check-vat-hu first
- Non-Hungarian VAT number formats may return false negatives
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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