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Polish NIP Validator (x402 Pay-Per-Call)
x402
Polish NIP Validator (x402 Pay-Per-Call) is a paid API for AI agents from x402-test.crewofthecaptain.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Validates the format and checksum of a Polish NIP (Numer Identyfikacji Podatkowej) tax identification number for $0.001 per call via x402/USDC
Price / call$0.001
Success—
StatusUnknown
How this service works
Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
Output
Returns a JSON object with fields: type ('pl-nip'), valid (boolean indicating if the NIP passes format and checksum rules), reason (a short explanation such as 'ok' or a description of the failure), and normalized (the cleaned/canonical form of the NIP string).
Example use cases
Supplier onboarding NIP check
“We're onboarding a new Polish supplier and they gave us NIP 7272445205 — can you confirm it's a valid NIP before we add them to our system?”
Invoice validation before payment
“Before I process this invoice, can you validate the Polish NIP 1234563218 to make sure the format and checksum are correct?”
Bulk data cleanup single entry
“I have a Polish company record with NIP 5213016998 — please verify it's properly formatted and the checksum passes so I can trust the data.”
Technical details
Endpoint
POSThttps://x402-test.crewofthecaptain.com/api/validate/pl-nip?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, pay-per-call NIP validation without a subscription — ideal for low-volume spot checks, agent pipelines doing Polish business data validation, or compliance workflows where you only pay for what you use. Prefer this over full KYC or business registry lookup services when all you need is format and checksum correctness, not real-time registry status.
Side effects
- Invalid or malformed NIP: returns valid=false with a reason describing the specific format or checksum failure
- Missing or empty value field: may return an error or valid=false
- Non-string input or input exceeding 512 characters: schema violation
- Payment failure via x402: HTTP 402 returned if USDC payment on Base is not completed
- Network or server error: HTTP 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | string |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "pl-nip",
"valid": true,
"reason": "ok",
"normalized": "…"
}
}Tags
x402
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