# Domain Intel — WHOIS, DNS, TLS & Subdomain Lookup (x402 Pay-Per-Call)

> Domain Intel — WHOIS, DNS, TLS & Subdomain Lookup (x402 Pay-Per-Call) 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).

Given a domain name, returns comprehensive intelligence including WHOIS registration data, DNS records, mail policy (SPF/DKIM/DMARC), TLS certificate details, and subdomains — billed per call in USDC via x402 with no signup required.

## Facts

- Endpoint: POST https://dns.halowerk.com/domain/articles/ns-host-europe?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-pay-per-call-e031bca2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UFNZ-lIS9-GJYwThynajl

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-pay-per-call-e031bca2 -d '<json body>'
```

Example prompt: Pull a full domain intelligence report for stripe.com — I need the WHOIS registration info, DNS records, subdomains, TLS certificate, and mail policy (SPF, DKIM, DMARC).

## When to prefer this

Choose this endpoint when you need a single pay-per-call, no-signup domain intelligence lookup combining WHOIS, DNS, mail policy, TLS, and subdomains in one call. Ideal for ad-hoc investigations, security research, or automated pipelines where you want to avoid subscription overhead. The optional baseline parameter makes it especially suited for change-detection workflows. Prefer alternatives if you need bulk domain lookups or continuous monitoring at scale.

## Known failure modes

- Invalid or malformed domain name returns validation error
- Domain does not exist (NXDOMAIN) results in partial or empty response
- Payment failure over x402 protocol blocks the request
- Rate limiting if the same domain is queried in rapid succession
- WHOIS privacy protection may redact registrant details
- Timeout for domains with slow or unresponsive nameservers

## 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 structured report containing: WHOIS registration data (registrar, registrant, dates), DNS records (A, AAAA, MX, NS, TXT, CNAME etc.), mail policy details (SPF, DKIM, DMARC), TLS certificate metadata (issuer, expiry, SANs), and a list of discovered subdomains. Optionally includes a diff against a provided baseline of DNS records.

## 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-pay-per-call-e031bca2/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)