# dns-txt-pay-subdomain

> dns-txt-pay-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 2026-10-20).

Looks up the TXT DNS record for the pay.<domain> subdomain via Cloudflare DNS over HTTPS and reports existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/pay/txt?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-txt-pay-subdomain-72ed5393
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D3ZAh8yseCVyXQl-YPNDX

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-pay-subdomain-72ed5393
```

Example prompt: Can you check whether pay.stripe.com has any TXT records in DNS right now, and tell me what the TTL is?

## When to prefer this

Use this endpoint when you need a quick, targeted existence and TXT record check specifically for the pay subdomain of a domain, without enumerating all subdomains. Prefer this over general DNS lookup tools when you only care about the pay host and want Cloudflare DoH resolution with minimal cost.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records
- pay subdomain has no TXT records — exists but empty result
- Cloudflare DoH unreachable — upstream timeout or error
- Invalid domain input — malformed domain rejected
- Payment failure — $0.01 USDC charge fails, request not processed

## How this service works

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

## Output

Returns whether the pay.<domain> subdomain exists, its TXT DNS record values, the TTL, and the DNS response code (e.g. NOERROR, NXDOMAIN).

## 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-pay-subdomain-72ed5393/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)