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IBAN Validation Check
x402
IBAN Validation Check is a paid API for AI agents from supplier-payment-verifier-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).
Validates an IBAN string using ISO 13616 mod-97 checksum, length, and country checks, returning PASSED or FAILED with a reason code.
Price / call$0.005
Success—
StatusUnknown
How this service works
Cheapest call. Validates an IBAN (ISO 13616 mod-97 checksum, length and country) before you pay it. Returns PASSED or FAILED with a reason code. Irish (IE) IBANs pass by default.
Output
A JSON object containing the original IBAN, the check type ('IBAN'), a boolean valid flag, the detected country code, an outcome string ('PASSED' or 'FAILED'), an ISO 8601 timestamp of when the check was performed, and a reason_code (e.g. 'IBAN_VALID', or a specific failure reason such as invalid checksum or unsupported country).
Example use cases
Pre-payment supplier IBAN check
“I'm about to pay a new Irish supplier — their IBAN is IE29AIBK93115212345678. Can you verify it's valid before we send the money?”
Invoice processing automation
“We just received an invoice from a German supplier with IBAN DE89370400440532013000. Check that the IBAN is valid and passes all format checks before we queue it for payment.”
Onboarding new vendor bank details
“We're onboarding a new vendor and they've given us IBAN GB29NWBK60161331926819 — can you run a validation check to confirm the format and checksum are correct?”
Technical details
Endpoint
POSThttps://supplier-payment-verifier-production.up.railway.app/v1/checks/iban?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, inexpensive ($0.005) IBAN format and checksum validation before executing a supplier payment, especially for Irish (IE) and other European IBANs. Prefer this over a full supplier verification workflow when you only need to confirm the bank account number itself is structurally valid, not the supplier's identity or VAT registration.
Side effects
- IBAN fails mod-97 checksum — returns FAILED with reason code indicating checksum error
- IBAN length does not match the expected length for the declared country — returns FAILED with length mismatch reason
- Unsupported or unrecognised country code prefix — returns FAILED with country reason code
- IBAN too short or too long (violates minLength 5 or maxLength 40 constraint) — HTTP 422 validation error
- Malformed request body or missing iban field — HTTP 422 unprocessable entity
- Payment not completed (x402 protocol) — HTTP 402 payment required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| iban | string | IBAN to validate (spaces allowed). |
Output
Schema · Response
{
"type": "json",
"example": {
"iban": "IE29AIBK93115212345678",
"check": "IBAN",
"valid": true,
"country": "IE",
"outcome": "PASSED",
"checked_at": "2026-10-15T12:00:00Z",
"reason_code": "IBAN_VALID"
}
}Tags
x402
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