# CardDAV-S SRV Record Lookup

> CardDAV-S SRV Record Lookup 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).

Resolves _carddavs._tcp SRV DNS records for a domain to discover where its CardDAV-over-TLS contact sync service is hosted.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/carddavs-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/carddav-s-srv-record-lookup-d29c42c5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IVlXdvRUmzZCqNFTM9nnD

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 carddav-s-srv-record-lookup-d29c42c5
```

Example prompt: Look up the _carddavs._tcp SRV record for example.com so I can find out which host and port to connect to for its secure CardDAV contact sync service.

## When to prefer this

Use this endpoint when you need to programmatically discover where a domain's CardDAV-over-TLS (HTTPS) contact sync service is hosted, instead of guessing common hostnames. Ideal for auto-configuration flows, infrastructure audits, and building directory tools. Prefer over generic DNS resolvers when you specifically need the _carddavs._tcp SRV record via a low-cost, pay-per-call API.

## Known failure modes

- Domain has no _carddavs._tcp SRV record (NXDOMAIN or empty answer)
- Domain does not exist
- Cloudflare DoH upstream timeout or error
- Malformed domain name input
- Payment not processed (x402 payment required)

## How this service works

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

## Output

Returns SRV record fields for the _carddavs._tcp subdomain of the queried domain: priority (lower = preferred), weight (load-balancing hint), port number, and target hostname. These tell a CardDAV client exactly where to connect for secure contact synchronization.

## 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/carddav-s-srv-record-lookup-d29c42c5/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)