# DNS CNAME Lookup for mx Subdomain via Cloudflare DoH

> DNS CNAME Lookup for mx Subdomain 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 2026-10-22).

Looks up the CNAME record for the mx.<domain> subdomain using Cloudflare DNS over HTTPS and returns whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mx/cname?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-cname-lookup-for-mx-subdomain-via-cloudflare-doh-df324692
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BEpWXD-12OOUx9clH_2OM

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-lookup-for-mx-subdomain-via-cloudflare-doh-df324692
```

Example prompt: Can you check whether mx.rallylive.ca has a CNAME record configured, and tell me what it points to and what the TTL is?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the mx CNAME record specifically, without enumerating all subdomains. Prefer it over general DNS tools when you need fast Cloudflare DoH-backed resolution with structured output and a clear exists/not-exists signal for the mx host.

## Known failure modes

- Domain not found or does not exist — returns no record found
- CNAME record absent for mx subdomain — returns non-existence result
- Network or Cloudflare DoH resolver timeout — lookup fails
- Malformed domain input — request may fail or return error
- mx subdomain uses A/AAAA record instead of CNAME — CNAME lookup returns empty

## How this service works

CNAME record of mx.<domain>: looks up the mx 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 mx without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the mx.<domain> CNAME record exists, the record value(s) it resolves to, and the TTL — or indicates the record does not exist if absent.

## 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-lookup-for-mx-subdomain-via-cloudflare-doh-df324692/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)