# AgentShelf SK IBAN Validator

> AgentShelf SK IBAN Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a mod-97-compliant Slovak (SK) IBAN of exactly 24 characters

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-sk?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-sk-iban-validator-fcdd6cb3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PQsufPOW1Gh-Y8hpMHdqq

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-sk-iban-validator-fcdd6cb3 -d '<json body>'
```

Example prompt: Can you check if SK3112000000198742637541 is a valid Slovak IBAN — confirm it's 24 characters and passes the mod-97 checksum?

## When to prefer this

Choose this endpoint when you need a pure algorithmic, offline mod-97 checksum and length validation of a Slovak (SK) IBAN with no external lookups. It is the right choice when you already know the country is Slovakia and need fast, deterministic validation without network dependencies. Use the free sandbox endpoint POST /v1/sandbox/check-iban-sk first to avoid charges during development.

## Known failure modes

- Invalid or missing 'value' field returns an error
- String not starting with 'SK' fails country-code check
- String not exactly 24 characters fails length validation
- String failing mod-97 arithmetic returns invalid result
- Malformed JSON body causes 400-class error
- Payment of $0.004 USDC required; missing payment header returns 402

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid SK number of length 24. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-iban-sk first.

## Output

Returns a boolean or structured result indicating whether the supplied string is a valid SK-country-code IBAN of exactly 24 characters that passes the ISO 13616 mod-97 checksum algorithm; no network lookup or external ledger check is performed.

## 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": [
    "SK68AAAA0000000000000000"
   ],
   "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-sk-iban-validator-fcdd6cb3/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)