# DNS TXT Record Lookup for portal.<domain> Subdomain

> DNS TXT Record Lookup for portal.<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 TXT DNS record of the portal subdomain for a given domain using Cloudflare DNS-over-HTTPS, returning existence status, record values, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/portal/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-record-lookup-for-portal-domain-subdomain-fb22b67f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9iHlwKTtbYd0kXYYW7jMa

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-record-lookup-for-portal-domain-subdomain-fb22b67f
```

Example prompt: Can you check if portal.acmecorp.com has any TXT records in DNS — I want to know if that subdomain exists and what records are associated with it.

## When to prefer this

Use this endpoint when you need a quick, targeted TXT record existence check specifically for the 'portal' subdomain of a domain, without needing to enumerate all subdomains. Prefer this over general DNS lookup tools when you want a focused, cheap ($0.01) single-subdomain check routed through Cloudflare's DoH for privacy and reliability.

## Known failure modes

- Domain not found or has no portal subdomain — returns no records or NXDOMAIN
- Invalid domain name format causes lookup failure
- Cloudflare DoH upstream timeout or error
- Missing required domain input parameter

## How this service works

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

## Output

Returns whether the portal.<domain> subdomain exists in DNS, along with any TXT record values and their TTL as resolved by Cloudflare DNS-over-HTTPS. If the subdomain does not exist, reports non-existence.

## 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-record-lookup-for-portal-domain-subdomain-fb22b67f/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)