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ASCII DNS Hostname Validator
x402
ASCII DNS Hostname Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-19).
Checks whether a given string is a valid ASCII DNS hostname (no Unicode labels).
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is an ASCII DNS hostname. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-hostname first.
Output
A boolean or pass/fail result indicating whether the provided string conforms to ASCII DNS hostname rules (no Unicode/IDN labels, valid label structure and characters).
Example use cases
Validate user-submitted server address
“A user just typed 'my-server.internal.corp.net' as their mail server address — is it a valid ASCII DNS hostname?”
Pre-flight hostname check before DNS lookup
“Before I try to resolve 'api.prod--cluster.example.com', can you confirm it's a valid ASCII DNS hostname so I don't waste the lookup?”
Filter invalid hostnames from a config file
“I've got a hostname from a config entry: 'node_1.example.com' — is that actually a valid ASCII DNS hostname or will it cause problems?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-hostname?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need strict ASCII-only hostname validation (rejecting Unicode/IDN labels) and have already exhausted the free sandbox quota at POST /v1/sandbox/check-hostname. Prefer this over the Unicode hostname endpoint when your use case requires pure ASCII compliance (e.g. legacy DNS systems, email routing, configuration validation).
Side effects
- Empty string input rejected (minLength:1 constraint)
- String exceeding 20000 characters rejected (maxLength constraint)
- Payment failure results in 402 response — consider using the free sandbox endpoint first
- Malformed request body returns an error
- Non-string value for 'value' field causes schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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