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Polish VAT Number Checksum Validator
x402
Polish VAT Number Checksum Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Validates whether a Polish VAT (NIP) number has a correct checksum, without performing any registry or database lookup.
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs whether a PL VAT checksum is valid. No registry lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pl first.
Output
Returns a boolean or equivalent result indicating whether the submitted Polish VAT (NIP) number satisfies the official checksum algorithm, with no external registry or government database consulted.
Example use cases
Invoice validation for Polish supplier
“Before I send this invoice, can you verify that the Polish NIP number 5260001234 passes the checksum — I just need to know if the number itself is mathematically valid.”
Batch supplier onboarding form check
“We're onboarding a new vendor from Poland and they gave us NIP 7740001454 — can you quickly check if the checksum on that number is correct?”
E-commerce checkout VAT field validation
“A customer entered 9462593789 as their Polish VAT number at checkout — does that pass the NIP checksum validation?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-vat-pl?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, purely algorithmic checksum check on a Polish NIP/VAT number and do not need to confirm the number is actually registered with the Polish tax authority. Ideal for pre-validation of user input before making more expensive registry API calls, or when registry access is unavailable or unnecessary.
Side effects
- Input string is empty or missing — returns validation error
- Input exceeds 20000 character limit — rejected by schema
- Non-numeric or improperly formatted string may return invalid checksum result rather than an error
- Payment of exactly $0.001 USDC not provided — x402 payment required error returned
- Network timeout or service unavailability — HTTP 5xx error
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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