# agentshelf.syntexa.ch DNS SRV Submission UDP Lookup

> agentshelf.syntexa.ch DNS SRV Submission UDP Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Looks up DNS SRV records at _submission._udp.{hostname} for a given registrable domain, returning the service locator data for UDP submission services.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-submission-udp?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-dns-srv-submission-udp-lookup-c3e0f295
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EE4DxIKAtKJu6gDZrDCjQ

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-submission-udp-lookup-c3e0f295 -d '<json body>'
```

Example prompt: Can you look up the DNS SRV record at _submission._udp for the domain example.com and tell me what server and port handle UDP submission there?

## When to prefer this

Use this endpoint when an agent specifically needs to resolve the _submission._udp DNS SRV record for a registrable domain. Prefer the unpaid sandbox POST /v1/sandbox/dns-srv-submission-udp first for testing; use this paid endpoint ($0.001 USDC) in production flows where a real DNS lookup is required. Choose this over generic DNS tools when the query is scoped specifically to the SRV record type for UDP submission services.

## Known failure modes

- No SRV record exists for _submission._udp.{hostname} — returns empty or NXDOMAIN-style response
- Invalid or malformed hostname input — validation error
- Hostname exceeds 253-character limit — rejected
- DNS resolution timeout — service error
- Non-registrable domain submitted (e.g. bare TLD) — may return empty result

## How this service works

Call when an agent needs SRV records at _submission._udp.{hostname} for submission over UDP. The caller sends the registrable domain, not the underscored name. Send JSON {"hostname":"example.com"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/dns-srv-submission-udp first.

## Output

Returns the DNS SRV record(s) found at _submission._udp.{hostname}, including fields such as priority, weight, port, and target hostname, enabling the caller to locate the UDP submission service for the given domain.

## 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-submission-udp-lookup-c3e0f295/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)