# SiteCheck Domain RDAP/DNS Lookup

> SiteCheck Domain RDAP/DNS Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).

Looks up domain registration details (RDAP) and DNS records for a given domain or URL, returning registrar, dates, nameservers, IP addresses, MX records, and availability.

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/domain?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-domain-rdap-dns-lookup-033903e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zU9xXEFQ1Swyc-gjHjS3s

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 sitecheck-domain-rdap-dns-lookup-033903e9
```

Example prompt: Can you look up the registration details for wikipedia.org — I want to know who the registrar is, when it expires, its nameservers, and its MX and IP records?

## When to prefer this

Use this endpoint when you need authoritative domain registration data (RDAP) combined with live DNS resolution in a single call — especially useful for domain vetting, expiry monitoring, email deliverability checks, or cybersecurity investigations. Prefer this over generic WHOIS tools when you need structured JSON output including both registry metadata and DNS records (MX, A, AAAA) without signing up for an API key.

## Known failure modes

- Domain not found or unregistered — returns availability: 'unregistered' with limited data
- TLD not supported by RDAP — rdapAvailable: false, partial data only
- Invalid domain format — may return an error or empty result
- Network timeout reaching registry RDAP server — may return partial or no data
- Rate limiting by upstream RDAP registry — delayed or failed response

## How this service works

Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana or Arc. No signup, no API key.

## Output

A JSON object containing: DNS records (MX, IPv4, IPv6, null MX flag, resolves flag), DNSSEC status, domain name, registrar name and IANA ID, creation/update/expiry dates, days until expiry, nameservers, RDAP status codes, availability status, registrant country and organisation, and whether RDAP data was available.

## 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",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain or URL, e.g. example.com or https://www.example.com/page"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "dns": {
   "mx": [
    "mx-in1001.wikimedia.org"
   ],
   "ipv4": [
    "185.15.59.224"
   ],
   "ipv6": [
    "2a02:ec80:300:ed1a::1"
   ],
   "nullMx": false,
   "resolves": true
  },
  "note": "From the registry's RDAP service.",
  "dnssec": false,
  "domain": "wikipedia.org",
  "source": "IANA RDAP bootstrap + the TLD registry's RDAP server; DNS over HTTPS (Cloudflare, Google)",
  "ageDays": 9399,
  "createdAt": "2001-01-13T00:12:14.000Z",
  "expiresAt": "2027-01-13T00:12:14.000Z",
  "registrar": "MarkMonitor Inc.",
  "updatedAt": "2025-12-13T09:51:53.000Z",
  "registered": true,
  "nameServers": [
   "ns0.wikimedia.org",
   "ns1.wikimedia.org"
  ],
  "statusCodes": [
   "client delete prohibited",
   "client transfer prohibited"
  ],
  "availability": "registered",
  "rdapAvailable": true,
  "daysUntilExpiry": 461,
  "registrarIanaId": "292",
  "registeredDomain": "wikipedia.org",
  "registrantCountry": "US",
  "registrantOrganisation": "Wikimedia Foundation, Inc."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-domain-rdap-dns-lookup-033903e9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)