# agentshelf.syntexa.ch German IBAN Validator

> agentshelf.syntexa.ch German IBAN Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a mod-97-valid German (DE) IBAN of exactly 22 characters

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-de?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-german-iban-validator-8c2871a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sfQc4UuVEpQfYQn42v8Mk

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-syntexa-ch-german-iban-validator-8c2871a0 -d '<json body>'
```

Example prompt: Can you check whether DE44500105175407324931 is a valid German IBAN — specifically that it's 22 characters and passes the mod-97 checksum?

## When to prefer this

Use this endpoint when you specifically need to validate a German (DE) IBAN for format correctness and mod-97 checksum compliance. Prefer the free sandbox endpoint POST /v1/sandbox/check-iban-de first to avoid charges. Use this paid endpoint for production validation or when sandbox access is unavailable. For other country IBANs (e.g. MU), use the appropriate country-specific sibling endpoint on the same platform.

## Known failure modes

- Input is not a string or is empty — request rejected
- IBAN has wrong country prefix (not DE) — validation fails
- IBAN is not exactly 22 characters — validation fails
- Mod-97 checksum does not compute correctly — marked invalid
- Malformed or non-numeric characters cause parsing errors
- Service unavailable or payment not processed — HTTP 402 or 5xx returned

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid DE number of length 22. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-iban-de first.

## Output

Returns a boolean or structured response indicating whether the provided string is a valid German (DE) IBAN: correct country prefix, exactly 22 characters, 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": [
    "DE33AAAA00000000000000"
   ],
   "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-syntexa-ch-german-iban-validator-8c2871a0/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)