# DNS CNAME Lookup for api.<domain> Subdomain

> DNS CNAME Lookup for api.<domain> 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 2026-10-21).

Looks up the CNAME record for the 'api' subdomain of a given domain via Cloudflare DNS over HTTPS, returning existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/api/cname?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-cname-lookup-for-api-domain-subdomain-711fff79
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NAzyti7Mo9j-v-IP9GycH

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-api-domain-subdomain-711fff79
```

Example prompt: Can you check whether api.stripe.com has a CNAME record configured, and if so, what it points to and what the TTL is?

## When to prefer this

Use this endpoint when you need a fast, single-host existence check for the 'api' subdomain of a specific domain without performing a full subdomain enumeration. Ideal for integration verification, infrastructure auditing, or monitoring whether an API endpoint is DNS-configured. Prefer this over broader DNS enumeration tools when you only care about the canonical api.<domain> CNAME specifically.

## Known failure modes

- Domain not found or NXDOMAIN — api subdomain does not exist for the given domain
- Invalid or malformed domain name input
- DNS timeout or upstream Cloudflare DoH failure
- Domain exists but has no CNAME record (may have A/AAAA instead)

## How this service works

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

## Output

Returns whether the CNAME record for api.<domain> exists, the actual CNAME record value(s), the TTL, and the DNS response code (e.g. NOERROR or NXDOMAIN). If the subdomain does not exist, the response will indicate that clearly.

## 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-api-domain-subdomain-711fff79/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)