# CalDAVS SRV Record Lookup (caldavs-tcp)

> CalDAVS SRV Record Lookup (caldavs-tcp) is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Looks up _caldavs._tcp SRV DNS records for a domain via Cloudflare DoH, returning priority, weight, port, and target host for the domain's secure CalDAV service.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/caldavs-tcp?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/caldavs-srv-record-lookup-caldavs-tcp-83b70260
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RBVhUdshwHOXmQmqZ3vgc

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 caldavs-srv-record-lookup-caldavs-tcp-83b70260
```

Example prompt: Look up the _caldavs._tcp SRV record for example.com and tell me what host and port the secure CalDAV calendar service is running on.

## When to prefer this

Use this endpoint when you need to programmatically discover where a domain's secure CalDAV (CalDAVS) server lives without hardcoding hostnames, especially for calendar client auto-configuration, infrastructure verification, or diagnosing calendar sync issues. Prefer this over generic DNS resolvers when you specifically need the SRV record for the caldavs-tcp service type and want a paid, reliable Cloudflare DoH-backed result.

## Known failure modes

- Domain has no _caldavs._tcp SRV record published — returns empty result
- Invalid or malformed domain name input — returns error
- DNS resolution failure at Cloudflare DoH — returns upstream error
- Payment not processed (x402) — request rejected before DNS lookup

## How this service works

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

## Output

Returns the SRV record set for _caldavs._tcp.<domain> including priority, weight, port number, and target hostname for each record, sourced from Cloudflare's DNS over HTTPS resolver. If no SRV record exists, returns an empty or error result.

## 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/caldavs-srv-record-lookup-caldavs-tcp-83b70260/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)