# Czech IBAN Mod-97 Validator

> Czech IBAN Mod-97 Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a mod-97-valid Czech (CZ) IBAN of exactly 24 characters

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-cz?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/czech-iban-mod-97-validator-48ebb90c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_accsDVAO2ixjf1awUw0fm

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 czech-iban-mod-97-validator-48ebb90c -d '<json body>'
```

Example prompt: Can you check if 'CZ6508000000192000145399' is a valid Czech IBAN — specifically that it's 24 characters long and passes the mod-97 checksum?

## When to prefer this

Use this endpoint when you specifically need to validate a Czech Republic (CZ) IBAN for mod-97 compliance and correct length (24 characters). It is preferable over generic IBAN validators when the use case is narrowly scoped to CZ IBANs and you want a lightweight, paid microservice call. Try the free sandbox at POST /v1/sandbox/check-iban-cz first before using this paid endpoint.

## Known failure modes

- Input string is empty or missing — validation error
- IBAN is not 24 characters — returns invalid
- IBAN does not start with CZ country code — returns invalid
- Mod-97 checksum fails — returns invalid
- Malformed input (non-string, special characters) — may return error or invalid
- Network or service unavailability — HTTP 5xx error

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid CZ number of length 24. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-iban-cz first.

## Output

Returns whether the provided string is a valid Czech IBAN: confirms it starts with 'CZ', is exactly 24 characters in length, and passes the ISO 7064 mod-97-10 checksum algorithm. Likely returns a boolean or structured pass/fail result.

## 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": [
    "CZ70AAAA0000000000000000"
   ],
   "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/czech-iban-mod-97-validator-48ebb90c/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)