# POP3S SRV Record Lookup via Cloudflare DoH

> POP3S SRV Record Lookup via Cloudflare DoH is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Looks up _pop3s._tcp SRV DNS records for a domain to discover the host, port, priority, and weight of its POP3S mail service.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/pop3s-tcp?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pop3s-srv-record-lookup-via-cloudflare-doh-5cf12594
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jFHw6k8rg5vB8oVDDo7Zd

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 pop3s-srv-record-lookup-via-cloudflare-doh-5cf12594
```

Example prompt: What host and port should I connect to for POP3S mail on example.com? Look up the _pop3s._tcp SRV record and give me the target, port, priority, and weight.

## When to prefer this

Use this endpoint when you need to programmatically discover a domain's POP3S mail server location via DNS SRV records rather than guessing hostnames like 'mail.domain.com'. It is ideal for email client auto-configuration, infrastructure auditing, or any workflow that needs to resolve the authoritative POP3S endpoint for a domain. Prefer this over generic DNS tools when you specifically need _pop3s._tcp SRV semantics with priority and weight fields via Cloudflare DoH.

## Known failure modes

- Domain has no _pop3s._tcp SRV record (NXDOMAIN or empty answer section)
- Invalid or malformed domain name returns an error
- Cloudflare DoH upstream timeout or connectivity issue
- Domain exists but SRV record type not published by their DNS provider

## How this service works

POP3S service discovery (_pop3s._tcp.<domain>): SRV records with priority, weight, port and target host, from Cloudflare DoH. Tells a client where the domain's pop3s service lives without guessing hosts. $0.01 per lookup.

## Output

Returns SRV record data for _pop3s._tcp.<domain> including priority, weight, port number, and target hostname, sourced from Cloudflare DNS over HTTPS. This tells an application exactly where to connect for the domain's secure POP3 mail service.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pop3s-srv-record-lookup-via-cloudflare-doh-5cf12594/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)