# dns-txt-db-subdomain

> dns-txt-db-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 2026-10-16).

Looks up the TXT DNS record for the 'db' subdomain of a given domain via Cloudflare DoH and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/db/txt?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-txt-db-subdomain-787ffd10
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hSxSpKgMrXwwT9HrdiIwT

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-db-subdomain-787ffd10
```

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

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for TXT records on the 'db' subdomain of a specific domain without enumerating all subdomains. Prefer it over general DNS tools when you want a lightweight, paid-per-lookup approach using Cloudflare DoH for reliability, specifically for the 'db' common host pattern.

## Known failure modes

- Domain not found or does not exist — returns no records
- db subdomain has no TXT records — returns empty or negative existence result
- Malformed domain input — may return an error or unexpected result
- Cloudflare DoH upstream timeout — service may return an error
- Payment failure — request not processed if x402 payment is not completed

## How this service works

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

## Output

Returns whether the db.<domain> subdomain has TXT DNS records, the content of those records, and the TTL value. If the subdomain does not exist or has no TXT records, the response indicates absence.

## 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-db-subdomain-787ffd10/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)