# Agentshelf NAPTR DNS Lookup

> Agentshelf NAPTR DNS Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Resolves NAPTR (Naming Authority Pointer) DNS records for a given hostname

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-naptr?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-naptr-dns-lookup-b81e4792
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Bz13DdzaxZi0mbPyyWp6Q

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-naptr-dns-lookup-b81e4792 -d '<json body>'
```

Example prompt: Can you look up the NAPTR DNS records for sip.example.com and tell me what services and routing rules are configured?

## When to prefer this

Use this endpoint when you need programmatic access to NAPTR DNS records for a specific hostname, particularly for SIP/telephony service discovery, ENUM lookups, or URI resolution schemes. Prefer this over manual DNS tooling when operating in an agentic workflow that requires structured, machine-readable NAPTR data with predictable pricing.

## Known failure modes

- Hostname does not exist (NXDOMAIN) — empty or error response
- No NAPTR records found for a valid hostname
- Invalid hostname format (exceeds 253 chars or malformed) — validation error
- DNS timeout or upstream resolver failure
- Private or reserved hostnames may be rejected

## How this service works

Call when an agent needs NAPTR records at the exact hostname. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/dns-naptr first.

## Output

Returns the NAPTR DNS records associated with the queried hostname, including fields such as order, preference, flags, service type, regular expression, and replacement hostname for each record found.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hostname": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-naptr-dns-lookup-b81e4792/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)