# French IBAN Validator (FR, mod-97, length 27)

> French IBAN Validator (FR, mod-97, length 27) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a mod-97-valid French IBAN (FR prefix, exactly 27 characters)

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-fr?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/french-iban-validator-fr-mod-97-length-27-9678b1bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__SOVRfkcnHlP72JUS8l3h

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability french-iban-validator-fr-mod-97-length-27-9678b1bf -d '<json body>'
```

Example prompt: Can you check whether this IBAN is a valid French bank account number: FR7630006000011234567890189?

## When to prefer this

Use this endpoint when you specifically need to validate a French (FR) IBAN of exactly 27 characters with mod-97 checksum verification. If you need to validate IBANs for other countries (LT, LU, LV, MK, MR, PK, PS), use the corresponding sibling endpoints. Prefer the free sandbox endpoint POST /v1/sandbox/check-iban-fr for testing before using this paid endpoint.

## Known failure modes

- Input string is empty or missing — validation fails with input error
- IBAN is correct length but fails mod-97 checksum — returns invalid
- IBAN has correct FR prefix but wrong length (not 27 chars) — returns invalid
- Non-FR IBAN submitted — returns invalid (use sibling endpoints for other country codes)
- Malformed input (non-alphanumeric characters, spaces not stripped) — may return invalid or error

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid FR number of length 27. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-iban-fr first.

## Output

Returns a boolean validity result indicating whether the submitted string is a correctly formatted French IBAN: FR country code prefix, exactly 27 characters in length, and passing the mod-97 checksum algorithm.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "FR97AAAA0000000000000000000"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/french-iban-validator-fr-mod-97-length-27-9678b1bf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)