# Agentshelf IBAN FI Validator

> Agentshelf IBAN FI Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Validates whether a given IBAN is a mod-97-compliant Finnish (FI) bank account number of exactly 18 characters

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-fi?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-iban-fi-validator-b13767cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SpRN54MekqIapvmgCl5sP

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 agentshelf-iban-fi-validator-b13767cb -d '<json body>'
```

Example prompt: Can you check whether FI2112345600000785 is a valid Finnish IBAN — I need to confirm it passes the mod-97 checksum and is the right 18-character FI format before I send a payment.

## When to prefer this

Use this endpoint when you specifically need to validate a Finnish (FI) IBAN for correctness — both structural length (18 chars) and mod-97 checksum — before initiating a payment, storing banking data, or processing a financial form. Prefer the free sandbox endpoint POST /v1/sandbox/check-iban-fi first during development. For other country IBANs (LT, LU, LV, MK, etc.), use the corresponding country-specific sibling endpoints on the same host.

## Known failure modes

- IBAN string missing or empty — returns validation error
- IBAN is not an FI-prefix number — may return invalid or country mismatch
- IBAN length is not exactly 18 characters — fails validation
- Mod-97 checksum does not pass — returns invalid
- Malformed input (non-alphanumeric characters) — may return parse error
- Payment of $0.005 USDC not provided — returns 402 Payment Required

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid FI number of length 18. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-iban-fi first.

## Output

Returns a boolean or structured result indicating whether the supplied IBAN is a valid Finnish (FI) bank account number: confirms it is exactly 18 characters long, uses the FI country code, and passes 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": [
    "FI38AAAA0000000000"
   ],
   "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/agentshelf-iban-fi-validator-b13767cb/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)