# Syntexa AgentShelf IDN Hostname Validator

> Syntexa AgentShelf IDN Hostname Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).

Checks whether a given string is a valid hostname that may include Unicode (Internationalized Domain Name) labels

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-hostname-idn?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/syntexa-agentshelf-idn-hostname-validator-551813a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a4KDOK1xZg0Z4ZXIQwEiK

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 syntexa-agentshelf-idn-hostname-validator-551813a3 -d '<json body>'
```

Example prompt: Can you check whether 'münchen.de' is a valid internationalized (IDN/Unicode) hostname?

## When to prefer this

Prefer this endpoint when you need to validate hostnames that may include non-ASCII Unicode characters (IDN labels) rather than purely ASCII hostnames. Use the sibling ASCII hostname checker for purely ASCII domain names. Use this paid endpoint only after the free /v1/sandbox/check-hostname-idn endpoint is unavailable or unsuitable.

## Known failure modes

- Empty or missing value field returns validation error
- String exceeding 20000 characters rejected
- Malformed request body returns 400-class error
- Payment of $0.006 USDC not provided or insufficient triggers 402 Payment Required
- Network timeout or service unavailability returns 5xx error

## How this service works

Call when an agent needs whether a string is a hostname that may use Unicode labels. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-hostname-idn first.

## Output

A boolean or structured result indicating whether the input string is a valid hostname that may use Internationalized Domain Name (Unicode) labels, without performing any live DNS or mailbox lookup.

## 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": [
    "münchen.de"
   ],
   "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/syntexa-agentshelf-idn-hostname-validator-551813a3/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)