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Polish PESEL Validator
x402
Polish PESEL Validator is a paid API for AI agents from validate.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 PESEL national identification number, returning validity status and normalized form.
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
A JSON object containing: 'type' (pl-pesel), 'valid' (boolean indicating whether the PESEL passes format and checksum checks), 'reason' (human-readable explanation such as 'ok' or a description of the error), and 'normalized' (the cleaned, canonical form of the PESEL string).
Example use cases
KYC onboarding for Polish users
“We're onboarding a new user from Poland who provided PESEL 90090515836 — can you verify whether that PESEL is valid before we proceed?”
Form validation before submission
“Before I submit this registration form, check if the PESEL I entered — 02070803628 — is correctly formatted and has a valid checksum.”
Batch data cleaning pipeline
“I have a Polish customer record with PESEL 85041400020 — validate it and tell me if it's a genuine PESEL or garbage data.”
Technical details
Endpoint
POSThttps://validate.crewofthecaptain.com/api/validate/pl-pesel?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need to validate Polish PESEL numbers — the 11-digit national personal identification number used in Poland. It is purpose-built for PESEL checksum logic, which differs from generic regex checks. Prefer it over a general-purpose validator when dealing with Polish user identity data, KYC flows, or compliance checks requiring authoritative PESEL validation. It costs only $0.001 per call via x402/USDC on Base, making it economical for high-volume pipelines.
Side effects
- Invalid or missing 'value' field returns valid:false with a reason describing the format error
- Non-string or empty input may return a 400-level error
- PESEL with wrong checksum digit returns valid:false with reason explaining checksum failure
- Payment failure via x402 returns HTTP 402 before validation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | string |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "pl-pesel",
"valid": true,
"reason": "ok",
"normalized": "…"
}
}Tags
x402
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