# agentshelf.syntexa.ch DNS SRV HTTP Lookup

> agentshelf.syntexa.ch DNS SRV HTTP Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Returns SRV records at _http._tcp.{hostname} for a given registrable domain name

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-http?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-dns-srv-http-lookup-b8eb3d52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3xhEhM7UJKxJ9juEywPiT

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-http-lookup-b8eb3d52 -d '<json body>'
```

Example prompt: Can you look up the DNS SRV records at _http._tcp for the domain example.com?

## When to prefer this

Use this endpoint when an agent needs to perform DNS SRV record lookups specifically for the _http._tcp service type without setting up DNS resolution infrastructure. Prefer the unpaid POST /v1/sandbox/dns-srv-http endpoint for testing. Choose this over generic DNS libraries when the agent environment lacks DNS access or when a lightweight, pay-per-use HTTP-based lookup is preferred.

## Known failure modes

- Domain does not exist or has no _http._tcp SRV records — returns empty or NXDOMAIN-style response
- Invalid hostname format — request rejected due to schema constraints (minLength 1, maxLength 253)
- Payment failure — x402 payment of $0.01 USDC not completed, request blocked
- Transient DNS resolution failure — upstream resolver unavailable
- Caller provides the full underscored name (_http._tcp.example.com) instead of just the registrable domain, which may cause unexpected results

## How this service works

Call when an agent needs SRV records at _http._tcp.{hostname} for HTTP. The caller sends the registrable domain, not the underscored name. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-http first.

## Output

Returns the SRV records found at _http._tcp.{hostname}, including priority, weight, port, and target for each record entry. If no records exist, returns an empty or error result.

## 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-http-lookup-b8eb3d52/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)