# dns-txt-sftp-subdomain

> dns-txt-sftp-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 sftp.<domain> subdomain via Cloudflare DNS over HTTPS and returns whether it exists, its record values, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/sftp/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-sftp-subdomain-2b88d3c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qf-zcacZ5Nw2NM2l8d3lf

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-sftp-subdomain-2b88d3c9
```

Example prompt: Can you check whether sftp.example.com has any TXT records configured in DNS — I want to know if the sftp subdomain exists and what its records say?

## When to prefer this

Use this endpoint when you need a fast, targeted existence check for an sftp subdomain's TXT records on a specific domain, without doing broad subdomain enumeration. Prefer it over generic DNS lookup tools when you specifically need TXT record data on the sftp host and want to use Cloudflare's DoH resolver. It is ideal for infrastructure audits, vendor onboarding checks, and security reconnaissance workflows.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records returned
- sftp subdomain has no TXT record — empty record set with NOERROR
- Malformed domain input causes query failure
- Cloudflare DoH service temporarily unavailable — upstream DNS error
- Rate limiting or payment failure results in 402 response

## How this service works

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

## Output

Returns whether the TXT record for sftp.<domain> exists, the record values (strings), the TTL in seconds, and the DNS response code — giving a quick signal of whether an SFTP subdomain is DNS-configured without a full subdomain enumeration.

## 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-sftp-subdomain-2b88d3c9/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)