# Hungarian IBAN Validator (HU, length 28)

> Hungarian IBAN Validator (HU, length 28) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-29).

Validates whether a given string is a mod-97-valid Hungarian IBAN of exactly 28 characters.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-iban-hu?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hungarian-iban-validator-hu-length-28-5e91f327
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Aex1bwF8vSO1hBtEybbKZ

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 hungarian-iban-validator-hu-length-28-5e91f327 -d '<json body>'
```

Example prompt: Can you check whether this Hungarian bank account number is a valid IBAN: HU42117730161111101800000000?

## When to prefer this

Use this endpoint when you specifically need to validate a Hungarian (HU) IBAN and require the mod-97 checksum to be verified programmatically. Prefer this over generic IBAN validators when you know the account is Hungarian and want a dedicated, low-cost check. Try the sandbox endpoint (POST /v1/sandbox/check-iban-hu) before paying for production calls.

## Known failure modes

- String too short or too long (not 28 characters) — returns invalid
- Wrong country prefix (not HU) — returns invalid
- Mod-97 checksum fails — returns invalid
- Empty or missing input value — returns error
- Non-alphanumeric characters in IBAN — returns invalid

## How this service works

Call when an agent needs whether an IBAN is a mod-97-valid HU number of length 28. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-iban-hu first.

## Output

Returns a boolean or structured result indicating whether the submitted string is a valid Hungarian IBAN — specifically confirming it is 28 characters long, starts with the 'HU' 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": [
    "HU65AAAA00000000000000000000"
   ],
   "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/hungarian-iban-validator-hu-length-28-5e91f327/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)