# RDAP Whois Lookup

> RDAP Whois Lookup is a paid API for AI agents from mcpfax-utility.bowling-anthony.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Returns structured RDAP (Registration Data Access Protocol) registration data for a domain name or IP address — the modern replacement for legacy WHOIS.

## Facts

- Endpoint: GET https://mcpfax-utility.bowling-anthony.workers.dev/v1/rdap
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rdap-whois-lookup-b35eb9d4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A-C4sbxDp7JGKel2psqos

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 rdap-whois-lookup-b35eb9d4
```

Example prompt: Can you do an RDAP whois lookup on openai.com and tell me who the registrar is, when it was registered, when it expires, and what nameservers it's using?

## When to prefer this

Choose this endpoint when you need structured, machine-readable domain or IP registration data that goes beyond legacy WHOIS text parsing. It's ideal when you need reliable field-level data (expiry date, registrar, nameservers) without scraping unstructured text. Prefer it over raw WHOIS tools when working in an agentic pipeline that needs consistent JSON output, or when querying newer TLDs that only support RDAP. Not suitable for checking domain availability for purchase registration — use a registrar availability API instead.

## Known failure modes

- Domain not found or unregistered — returns empty or not-found RDAP response
- TLD registry does not support RDAP — may return an error or unsupported message
- IP address not in a delegated block — no record returned
- Malformed query input (invalid domain or IP format) — returns validation error
- RDAP registry temporarily unavailable — upstream timeout or 5xx error
- Rate limiting by upstream RDAP registry — intermittent failures under high query volume

## How this service works

RDAP whois — Structured domain/IP registration data (modern whois).

## Output

A structured RDAP JSON record containing registrar name, registration and expiration dates, nameservers, status codes, registrant/admin/tech contact handles (redacted per GDPR where applicable), events history, and for IP queries: network block, organization, and abuse contact details.

## 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"
    }
   },
   "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/rdap-whois-lookup-b35eb9d4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcpfax-utility.bowling-anthony.workers.dev](https://www.zero.xyz/host/mcpfax-utility.bowling-anthony.workers.dev/llms.txt)