# Syntexa AgentShelf DNS SRV POP3 Lookup

> Syntexa AgentShelf DNS SRV POP3 Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-18).

Resolves _pop3._tcp SRV DNS records for a given registrable domain name

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-pop3?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/syntexa-agentshelf-dns-srv-pop3-lookup-a67e391f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xOSYyyj0Qrgka0JdJLoUS

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 syntexa-agentshelf-dns-srv-pop3-lookup-a67e391f -d '<json body>'
```

Example prompt: What are the POP3 SRV DNS records for example.com? I need the host, port, priority, and weight so I can configure a mail client.

## When to prefer this

Use this endpoint when an agent needs to programmatically discover the POP3 mail server address and port for a domain via DNS SRV records, particularly during email client auto-configuration, mail infrastructure auditing, or automated mailbox provisioning workflows. Prefer the free sandbox endpoint (/v1/sandbox/dns-srv-pop3) for testing before using this paid endpoint.

## Known failure modes

- Domain has no _pop3._tcp SRV record — returns empty or not-found response
- Invalid or malformed hostname input — returns validation error
- DNS resolution timeout or upstream DNS failure — returns error
- Non-existent domain — DNS NXDOMAIN response

## How this service works

Call when an agent needs SRV records at _pop3._tcp.{hostname} for POP3. The caller sends the registrable domain, not the underscored name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-pop3 first.

## Output

Returns the SRV record data for _pop3._tcp.{hostname}, including fields such as priority, weight, port, and target hostname of the POP3 mail server, as resolved from DNS.

## 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/syntexa-agentshelf-dns-srv-pop3-lookup-a67e391f/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)