# DNS CNAME Lookup for mx1 Subdomain

> DNS CNAME Lookup for mx1 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 of the mx1 subdomain under a given domain via Cloudflare DNS-over-HTTPS and returns existence status, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mx1/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-lookup-for-mx1-subdomain-ac5bb868
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZtczV8LVUbYShUe3d1kMP

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-mx1-subdomain-ac5bb868
```

Example prompt: Can you check if mx1.acme.com has a CNAME record set up — I want to know whether the mx1 mail host exists under that domain and what it points to?

## When to prefer this

Use this endpoint when you need a fast, targeted existence check for the mx1 mail host CNAME record under a specific domain without enumerating all subdomains. Prefer it over general DNS tools when you specifically need CNAME data for the mx1 host and want a simple paid, low-latency API call backed by Cloudflare DoH.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records
- mx1 subdomain has no CNAME record (may have A/AAAA instead) — empty CNAME result
- Malformed domain input — request may fail or return an error
- Cloudflare DoH service timeout or unavailability — upstream error
- Rate limiting or payment failure for the $0.01 per-call fee

## How this service works

CNAME record of mx1.<domain>: looks up the mx1 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 mx1 without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the mx1.<domain> CNAME record exists, the CNAME record value(s) it resolves to, and the TTL of the record, as answered by 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-lookup-for-mx1-subdomain-ac5bb868/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)