# Arch Tools WHOIS Lookup

> Arch Tools WHOIS Lookup is a paid API for AI agents from archtools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Performs a WHOIS lookup for a given domain name, returning registration and ownership information

## Facts

- Endpoint: POST https://archtools.dev/v1/tools/whois-lookup
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arch-tools-whois-lookup-6af9aab1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JQfXg-AZrS4haxtjtBNzF

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 arch-tools-whois-lookup-6af9aab1 -d '<json body>'
```

Example prompt: Can you do a WHOIS lookup on openai.com and tell me who registered it, when it expires, and which registrar is handling it?

## When to prefer this

Choose this endpoint when you need quick, pay-per-call WHOIS data without managing your own WHOIS client or API keys. It is especially useful for agents doing domain intelligence, cybersecurity research, competitive analysis, or pre-purchase domain research. At $0.01 per call it is cost-effective for occasional lookups integrated into automated workflows via the x402 payment protocol.

## Known failure modes

- Domain not found or not registered — returns empty or error response
- WHOIS data redacted by privacy protection services — limited registrant info returned
- Invalid domain format supplied — validation error
- Rate limiting or temporary unavailability of upstream WHOIS servers
- TLD not supported by WHOIS lookup service

## How this service works

Domain registration, expiry, nameservers via RDAP. Pay per call with USDC (x402) or credits - archtools.dev

## Output

A JSON object containing WHOIS data for the queried domain, typically including registrar name, registration and expiration dates, registrant contact details (where publicly available), name servers, and domain status flags.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain name to look up (e.g. example.com)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arch-tools-whois-lookup-6af9aab1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from archtools.dev](https://www.zero.xyz/host/archtools.dev/llms.txt)