# WHOIS Lookup (RDAP)

> WHOIS Lookup (RDAP) is a paid API for AI agents from ZeroClick x402 Service Registry at whois.withzero.ai, paid per call via MPP, $0.001/call, not verified (last probed 2026-10-10); live alternatives: Stable Domains Availability Checker ($0.05) and NetIntel Bulk Domain Availability Check ($0.1).

Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

Live alternatives for the same use case:
- [Stable Domains Availability Checker](https://www.zero.xyz/c/stable-domains-availability-checker-d9c6e557) ($0.05)
- [NetIntel Bulk Domain Availability Check](https://www.zero.xyz/c/netintel-bulk-domain-availability-check-0a16e4f3) ($0.1)

Look up domain registration details including registrar, creation/expiration dates, name servers, and status using the RDAP protocol.

## Facts

- Endpoint: POST https://whois.withzero.ai/run?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- Last successful call: 2026-07-17
- Success rate: 100% of calls made through Zero
- Rating: 4.7 / 5 from 1 review
- Activations on Zero: 7
- Provider: ZeroClick x402 Service Registry
- Website: https://withzero.ai
- Tags: data, whois, rdap, domain, dns, registrar, lookup
- Canonical page: https://www.zero.xyz/c/zeroclick-x402-service-registry-whois-lookup-0d3f4508
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PYHZbk2tn2qaZty-h5qNC

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 zeroclick-x402-service-registry-whois-lookup-0d3f4508 -d '<json body>'
```

Example prompt: Can you look up the WHOIS registration details for github.com — I want to know the registrar, when it was created, when it expires, and what name servers it's using?

## When to prefer this

Choose this endpoint when you need structured domain registration metadata (registrar, dates, name servers, status) for any domain, especially when you want a free, key-free solution using the modern RDAP protocol rather than legacy WHOIS. Ideal for agents checking domain ownership, expiration risk, or DNS configuration.

## Known failure modes

- Domain not found or not registered — registrar and dates may return null
- RDAP registry for the TLD is unavailable or unresponsive — may return partial data
- Invalid domain format — validation error on input
- TLD not supported by RDAP protocol — limited or no data returned

## How this service works

Look up domain registration details using the RDAP protocol (the modern successor to WHOIS). Free, no API key needed. Input: a domain name. Output: registrar, creation date, expiration date, last updated date, name servers, and domain status.

## Output

Returns a structured object with the queried domain name, registrar name, ISO 8601 creation/expiration/last-updated dates (or null if unavailable), a list of authoritative name servers, and an array of domain status codes such as 'active' or 'clientTransferProhibited'.

## Example request

```json
{
 "domain": "example.com"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 253,
   "minLength": 1,
   "description": "Domain name to look up (e.g. \"example.com\", \"google.co.uk\")"
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain",
  "registrar",
  "createdDate",
  "expiresDate",
  "updatedDate",
  "nameServers",
  "status"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "description": "The queried domain name"
  },
  "status": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Domain status codes (e.g. \"active\", \"clientTransferProhibited\")"
  },
  "registrar": {
   "type": "string",
   "description": "Domain registrar name"
  },
  "createdDate": {
   "type": "string",
   "nullable": true,
   "description": "Domain creation date (ISO 8601) or null if unavailable"
  },
  "expiresDate": {
   "type": "string",
   "nullable": true,
   "description": "Domain expiration date (ISO 8601) or null if unavailable"
  },
  "nameServers": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "List of authoritative name servers"
  },
  "updatedDate": {
   "type": "string",
   "nullable": true,
   "description": "Last updated date (ISO 8601) or null if unavailable"
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zeroclick-x402-service-registry-whois-lookup-0d3f4508/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whois.withzero.ai](https://www.zero.xyz/host/whois.withzero.ai/llms.txt)