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IBAN Format & Checksum Validator (x402)
x402
IBAN Format & Checksum Validator (x402) 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 an IBAN bank account number, returning a validity flag and normalized form, paid per-call via x402.
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' (always 'iban'), 'valid' (boolean), 'reason' (ok or an error message describing why it failed), and 'normalized' (the canonically formatted IBAN string).
Example use cases
Validate payee IBAN before wire transfer
“Before I send this wire transfer, can you confirm that GB29NWBK60161331926819 is a properly formatted and valid IBAN?”
Batch-precheck IBANs in onboarding form
“A user just entered PL61109010140000071219812874 as their bank account IBAN during signup — can you validate it so we know whether to accept the form?”
Catch typos in bank account field
“The customer typed in FR7630006000011234567890189 as their IBAN — is that checksum actually correct, or did they make a typo?”
Technical details
Endpoint
POSThttps://x402-test.crewofthecaptain.com/api/validate/iban?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call IBAN validation with no subscription — ideal for low-volume or sporadic checks where a recurring SaaS fee is wasteful. It is purpose-built for IBAN specifically (not a generic string validator), returns a normalized form, and costs only $0.001 per call via x402 micropayments.
Side effects
- Invalid format returns valid:false with a descriptive reason string
- Empty or missing value field may return a 400 error
- Non-IBAN strings (e.g. email addresses) will fail validation with an appropriate reason
- Payment failure via x402 results in a 402 response if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | string |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "iban",
"valid": true,
"reason": "ok",
"normalized": "…"
}
}Tags
x402
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