# dns-txt-internal-subdomain

> dns-txt-internal-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 2026-10-22).

Looks up the TXT DNS record for the 'internal' subdomain of a given domain via Cloudflare DNS-over-HTTPS and reports existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/internal/txt?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-txt-internal-subdomain-16b472b3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dnr6VQNDTcYtZoKUpP_uM

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-internal-subdomain-16b472b3
```

Example prompt: Can you check whether the 'internal' subdomain of acme.com has any TXT DNS records — I want to know if it exists and what the TTL is?

## When to prefer this

Use this endpoint when you need a fast, single-shot existence and TXT record check for the 'internal' subdomain specifically, without enumerating all subdomains. Ideal for quick infrastructure audits, security checks, or verifying DNS propagation for the internal host of a domain. Prefer this over full DNS enumeration tools when you only care about the 'internal' common hostname and need a lightweight, pay-per-use check via Cloudflare DoH.

## Known failure modes

- Domain does not exist (NXDOMAIN) — returns no records and existence=false
- internal.<domain> exists as a hostname but has no TXT records — returns empty record set
- Cloudflare DoH unreachable — service may timeout or return an error
- Malformed domain input — may return an error or unexpected result
- Payment not processed — x402 payment required error before lookup is attempted

## How this service works

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

## Output

Returns whether the TXT record for 'internal.<domain>' exists, the actual TXT record string values, the TTL in seconds, and the DNS response code — all sourced from a Cloudflare DNS-over-HTTPS lookup.

## 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-internal-subdomain-16b472b3/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)