# agentshelf.syntexa.ch DNS SRV Presence Lookup

> agentshelf.syntexa.ch DNS SRV Presence Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-24).

Looks up SRV records at _presence._tcp.{hostname} for XMPP presence service discovery given a registrable domain name

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-presence?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-dns-srv-presence-lookup-06a28880
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nqgtjM6yH77zgm93dtd8T

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-dns-srv-presence-lookup-06a28880 -d '<json body>'
```

Example prompt: Can you look up the XMPP presence SRV records for example.com — I need to know what server and port handle _presence._tcp for that domain?

## When to prefer this

Use this endpoint when you specifically need to resolve _presence._tcp SRV records for XMPP presence service discovery and are willing to pay $0.005 USDC per lookup. If a free sandbox alternative at POST /v1/sandbox/dns-srv-presence is available, prefer that first. Choose this over generic DNS lookup tools when you need XMPP-specific presence record resolution without constructing the underscored service name yourself.

## Known failure modes

- Domain not found or no DNS records exist — returns empty or error response
- Invalid hostname format (too long, empty, or malformed) — input validation error
- DNS resolution timeout — transient network failure
- Domain exists but has no _presence._tcp SRV records — empty result set

## How this service works

Call when an agent needs SRV records at _presence._tcp.{hostname} for XMPP presence. The caller sends the registrable domain, not the underscored name. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-presence first.

## Output

Returns the SRV record entries found at _presence._tcp.{hostname}, including fields such as priority, weight, port, and target hostname for each record. If no records exist, returns an empty result or appropriate indicator.

## 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-syntexa-ch-dns-srv-presence-lookup-06a28880/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)