# dns-txt-cdn-subdomain

> dns-txt-cdn-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 TXT DNS record for the cdn.<domain> subdomain via Cloudflare DoH and reports existence, record values, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/cdn/txt?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-txt-cdn-subdomain-e6a8bad8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DAiQrSih7fw4z4k-240T9

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-txt-cdn-subdomain-e6a8bad8
```

Example prompt: Check if there's a TXT record on the cdn subdomain for shopify.com — I want to know if it exists, what the record says, and what the TTL is.

## When to prefer this

Use this endpoint when you need a quick, targeted check on whether a domain has a cdn subdomain configured with TXT records, without running a full subdomain enumeration. Ideal for DNS reconnaissance, infrastructure validation, or CDN setup verification when you specifically need the cdn host and TXT record type. Prefer this over general DNS tools when you want a low-cost ($0.01), single-purpose lookup routed through Cloudflare DoH for reliability.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records
- cdn subdomain has no TXT record — empty result or NOERROR with no answer
- Cloudflare DoH unavailable — upstream timeout or HTTP error
- Invalid domain format provided — request fails or returns error
- Rate limiting or payment failure — 402 response if payment not processed

## How this service works

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

## Output

Returns whether the cdn.<domain> subdomain has a TXT record, the record value(s) if present, the TTL, and the DNS response status — all resolved via Cloudflare DNS over HTTPS.

## 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-txt-cdn-subdomain-e6a8bad8/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)