# dns-cname-support-subdomain

> dns-cname-support-subdomain 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 the CNAME record for the support subdomain of a given domain via Cloudflare DNS-over-HTTPS and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/support/cname?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/dns-cname-support-subdomain-5d659e28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oGYXBz7GPjtohEkyYccRb

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 dns-cname-support-subdomain-5d659e28
```

Example prompt: Can you check if support.acme.com has a CNAME record configured — I want to know if the support subdomain exists and what it points to.

## When to prefer this

Use this endpoint when you need a fast, single-subdomain existence check specifically for the 'support' host under a domain, without needing to enumerate all subdomains. Prefer over generic DNS tools when you want a targeted CNAME check with minimal overhead and pay-per-lookup pricing.

## Known failure modes

- Domain does not have a support CNAME record — returns not-found or empty record set
- Invalid or malformed domain name causes lookup failure
- Cloudflare DoH upstream timeout or resolution error
- Domain does not exist at all — NXDOMAIN response

## How this service works

CNAME record of support.<domain>: looks up the support host under the domain you give (CNAME via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like support without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the support.<domain> CNAME record exists, the CNAME target(s), and the TTL value. If the record does not exist, reports absence. Data is fetched in real time via Cloudflare DoH.

## 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/dns-cname-support-subdomain-5d659e28/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)