# DNS SRV Record Lookup for IAX (_iax._udp)

> DNS SRV Record Lookup for IAX (_iax._udp) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-18).

Resolves SRV records at _iax._udp.{hostname} for Inter-Asterisk eXchange (IAX) protocol discovery, given a plain registrable domain name.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-iax?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-srv-record-lookup-for-iax-iax-udp-b8ca2959
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8MYwmV0HIfbLP_DNpjRIq

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 dns-srv-record-lookup-for-iax-iax-udp-b8ca2959 -d '<json body>'
```

Example prompt: Look up the IAX SRV records for the domain example.com — I need to find the IAX server address, port, priority, and weight configured in its DNS.

## When to prefer this

Use this endpoint when an agent specifically needs to discover IAX (Inter-Asterisk eXchange) VoIP service endpoints via DNS SRV records for a given domain. Prefer the unpaid sandbox POST /v1/sandbox/dns-srv-iax endpoint during testing. Choose this over generic DNS lookup tools when the specific _iax._udp SRV record type is required for VoIP/telephony integration.

## Known failure modes

- Domain does not exist or has no DNS records — NXDOMAIN or empty response
- No _iax._udp SRV record published for the given domain
- Malformed hostname input exceeding 253 characters or violating DNS naming rules
- DNS resolution timeout or upstream resolver failure
- Payment failure — USDC payment of $0.009 not completed successfully

## How this service works

Call when an agent needs SRV records at _iax._udp.{hostname} for IAX. The caller sends the registrable domain, not the underscored name. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-iax first.

## Output

Returns the SRV record data found at _iax._udp.{hostname}, including priority, weight, port, and target hostname for the IAX service endpoint. If no SRV record exists, returns an appropriate empty or error response.

## 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/dns-srv-record-lookup-for-iax-iax-udp-b8ca2959/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)