# AgentShelf DNS SRV Sieve Lookup

> AgentShelf DNS SRV Sieve Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-19).

Resolves SRV records at _sieve._tcp.{hostname} for the ManageSieve protocol, given a registrable domain name

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-sieve?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dns-srv-sieve-lookup-c234f001
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QYMNkdnyAKdpzig5caPPW

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-dns-srv-sieve-lookup-c234f001 -d '<json body>'
```

Example prompt: Look up the ManageSieve SRV record for example.com so I can find the sieve server hostname and port.

## When to prefer this

Use this endpoint when an agent needs to discover the ManageSieve server for a given email domain via DNS SRV lookup. It abstracts the underscored SRV naming convention (_sieve._tcp) so the caller only needs to supply the plain registrable domain. Prefer the free sandbox endpoint (/v1/sandbox/dns-srv-sieve) for testing before incurring the $0.008 USDC charge on this paid endpoint.

## Known failure modes

- Domain does not have a _sieve._tcp SRV record — returns empty or not-found response
- Invalid hostname input (malformed or exceeding 253 characters) — returns validation error
- DNS resolution failure or timeout — returns error indicating lookup could not complete
- Payment failure — request rejected before DNS lookup is attempted

## How this service works

Call when an agent needs SRV records at _sieve._tcp.{hostname} for ManageSieve. The caller sends the registrable domain, not the underscored name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-sieve first.

## Output

Returns the SRV record data found at _sieve._tcp.{hostname}, including the priority, weight, port number, and target hostname of the ManageSieve server. If no record exists, an appropriate error or empty response is returned.

## 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-dns-srv-sieve-lookup-c234f001/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)