# DNS CNAME Lookup for SSO Subdomain

> DNS CNAME Lookup for SSO 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 sso.<domain> subdomain via Cloudflare DoH and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/sso/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-sso-subdomain-54f54ca1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eOYNAUHhheNQJzqmhQhiP

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-sso-subdomain-54f54ca1
```

Example prompt: Can you check if sso.example.com has a CNAME record set up — I want to know where it points and what the TTL is?

## When to prefer this

Use this endpoint when you need a quick, lightweight check on whether a specific domain has an SSO subdomain configured via CNAME, without doing full subdomain enumeration. Ideal for security audits, vendor assessments, or pre-integration checks where you only care about the sso host specifically. Prefer this over generic DNS tools when you want a pay-per-lookup, agent-friendly API backed by Cloudflare DoH for reliability.

## Known failure modes

- Domain does not exist — returns no record found
- sso subdomain has no CNAME record (may have A or other record types instead)
- Cloudflare DoH query timeout or upstream DNS failure
- Invalid domain format provided as input
- Payment of $0.01 USDC not fulfilled — request rejected

## How this service works

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

## Output

Returns whether the CNAME record for sso.<domain> exists, the CNAME target(s) it points to, and the TTL value. If the record does not exist, the response indicates absence. Delivered via Cloudflare DoH resolution.

## 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-sso-subdomain-54f54ca1/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)