Polish REGON Number Validator

x402

Polish REGON Number 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 REGON business registration number via pay-per-call API

Price / call$0.001

Seller volume →—

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-regon), 'valid' (boolean indicating whether the REGON passes format and checksum checks), 'reason' (a short explanation such as 'ok' or a description of why it failed), and 'normalized' (the cleaned/normalized form of the REGON number).

Example use cases

Supplier onboarding REGON verification

“We're onboarding a new Polish supplier and they gave us REGON 591860040 — can you verify it's a valid REGON number before we add them to our system?”

E-commerce checkout business ID check

“A business customer entered REGON 000331501 at checkout — validate it for me so we know it's properly formatted before we issue their B2B invoice.”

CRM data quality cleanup

“I have a list of REGON numbers in our CRM and want to flag any that fail checksum validation — start by checking this one: 890165760.”

Technical details

Endpoint

POSThttps://validate.crewofthecaptain.com/api/validate/pl-regon?utm_source=zero.xyz

When to prefer

Use this endpoint when you specifically need to validate a Polish REGON business registration number with checksum verification, not just format matching. It is especially suitable for pay-per-call, low-volume or on-demand validation scenarios where you don't want a subscription. Prefer this over manual regex checks when checksum correctness matters (e.g., onboarding suppliers, processing invoices, or cleaning CRM data).

Side effects

Input value is empty or missing — likely returns valid:false with a descriptive reason
REGON fails checksum verification — returns valid:false with reason explaining the error
Value contains non-numeric characters or wrong length (REGON must be 9 or 14 digits) — returns valid:false
Payment not completed via x402 — returns HTTP 402 Payment Required before processing
Malformed request body — may return HTTP 400

Input

Schema · Request body

Field	Type	Description
value	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "type": "pl-regon",
    "valid": true,
    "reason": "ok",
    "normalized": "…"
  }
}

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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

Example use cases

Supplier onboarding REGON verification

“We're onboarding a new Polish supplier and they gave us REGON 591860040 — can you verify it's a valid REGON number before we add them to our system?”

E-commerce checkout business ID check

“A business customer entered REGON 000331501 at checkout — validate it for me so we know it's properly formatted before we issue their B2B invoice.”

CRM data quality cleanup

“I have a list of REGON numbers in our CRM and want to flag any that fail checksum validation — start by checking this one: 890165760.”

Technical details

Endpoint

POSThttps://validate.crewofthecaptain.com/api/validate/pl-regon?utm_source=zero.xyz

When to prefer

Side effects

Input value is empty or missing — likely returns valid:false with a descriptive reason
REGON fails checksum verification — returns valid:false with reason explaining the error
Value contains non-numeric characters or wrong length (REGON must be 9 or 14 digits) — returns valid:false
Payment not completed via x402 — returns HTTP 402 Payment Required before processing
Malformed request body — may return HTTP 400

Input

Schema · Request body

Field	Type	Description
value	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "type": "pl-regon",
    "valid": true,
    "reason": "ok",
    "normalized": "…"
  }
}