# Domain Intel — WHOIS, DNS, TLS & Subdomain Lookup (x402)

> Domain Intel — WHOIS, DNS, TLS & Subdomain Lookup (x402) is a paid API for AI agents from dns.halowerk.com, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-13).

Performs comprehensive domain intelligence gathering — WHOIS, DNS records, mail policy, TLS certificate, and subdomains — for a given domain, with pay-per-call USDC billing via x402.

## Facts

- Endpoint: POST https://dns.halowerk.com/domain/articles/ns-vercara-ultradns?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/domain-intel-whois-dns-tls-subdomain-lookup-x402-a89c1d09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wbLjv-5y4U_WCzgJLJISx

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 domain-intel-whois-dns-tls-subdomain-lookup-x402-a89c1d09 -d '<json body>'
```

Example prompt: Pull up everything you can on stripe.com — WHOIS registration details, all DNS records, TLS certificate info, mail policy like SPF and DMARC, and any subdomains you can find.

## When to prefer this

Choose this endpoint when you need a one-shot, no-signup domain intelligence report combining WHOIS, DNS, TLS, mail policy, and subdomains in a single call — especially useful for agents operating without pre-registered API keys. It is ideal for security research, due diligence, and DNS change monitoring. Prefer alternatives if you need real-time continuous monitoring, bulk batch processing of many domains at once, or deep passive DNS history.

## Known failure modes

- Domain not found or unresolvable — returns empty or error result
- Invalid domain format exceeding 253 characters — schema validation failure
- WHOIS data unavailable for certain TLDs or privacy-protected registrations
- TLS certificate absent if domain has no HTTPS endpoint
- Rate limiting or payment failure via x402 protocol
- Subdomain enumeration may be incomplete for domains with large or private zone data

## How this service works

Domain in, WHOIS, DNS, mail policy, TLS certificate and subdomains out. Pay per call in USDC over x402. No signup, no API key.

## Output

A comprehensive domain intelligence report containing: WHOIS registration data, resolved DNS records (A, AAAA, MX, NS, TXT, CAA, SOA), mail security policy (SPF, DKIM, DMARC), TLS/SSL certificate details, and discovered subdomains. When a baseline is provided, the response can highlight changes relative to that baseline.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 253
  },
  "baseline": {
   "type": "object",
   "required": [
    "domain",
    "observed_at",
    "records"
   ],
   "properties": {
    "domain": {
     "type": "string",
     "maxLength": 253
    },
    "records": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 254
     },
     "maxItems": 50
    },
    "observed_at": {
     "type": "string",
     "maxLength": 40
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domain-intel-whois-dns-tls-subdomain-lookup-x402-a89c1d09/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.halowerk.com](https://www.zero.xyz/host/dns.halowerk.com/llms.txt)