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Whoisfreaks for AI agents

WhoisFreaks looks up domain WHOIS, DNS, and SSL data, used by security and domain research teams investigating who owns or operates a domain. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect WhoisfreaksSee the 17 actions ↓
Developer toolsAPI keyMCP + RESTwhoisfreaks.com
AUDIT LOG · WHOISFREAKSPOLICY: acme-support
09:41:07 · claude · u_8f2read
whoisfreaks.get_domainer_files_status
Get Domain Files Status✓ allowed · 212ms
09:41:09 · claude · u_8f2write
whoisfreaks.bulk_dns_lookup
Bulk DNS Lookup✓ approved · approved by user
EVERY WHOISFREAKS CALL, ON THE RECORD
01 · USE CASES

What agents do in Whoisfreaks.

01

Look up WHOIS for a domain

Pull registration details for a domain, a read-only lookup.

02

Check domain availability

Check whether a domain name is currently registered or available.

03

Look up a domain's SSL certificate

Check the SSL certificate details currently in use on a domain.

02 · ACTIONS

17 Whoisfreaks actions, graded by risk.

Every Whoisfreaks action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

1

Look things up. Allowed by default.

  • whoisfreaks.get_domainer_files_status
    Get Domain Files Status

write

16

Create and change things. Allow, or ask the user first.

  • whoisfreaks.bulk_dns_lookup
    Bulk DNS Lookup
  • whoisfreaks.dns_live_lookup
    DNS Live Lookup
  • whoisfreaks.ip_whois_lookup
    IP WHOIS Lookup
  • whoisfreaks.asn_whois_lookup
    ASN WHOIS Lookup
  • whoisfreaks.bulk_whois_lookup
    Bulk WHOIS Lookup
  • whoisfreaks.subdomains_lookup
    Subdomain Lookup
  • whoisfreaks.whois_live_lookup_v2
    WHOIS Live Lookup V2
  • whoisfreaks.ip_geolocation_lookup
    IP Geolocation Lookup
  • whoisfreaks.security_threat_lookup
    Security Threat Lookup
  • whoisfreaks.ssl_certificate_lookup
    SSL Certificate Lookup
  • whoisfreaks.whois_historical_lookup
    WHOIS Historical Lookup
  • whoisfreaks.domain_availability_check
    Check Domain Availability
  • whoisfreaks.whois_reverse_lookup_by_email
    WHOIS Reverse Lookup by Email
  • whoisfreaks.whois_reverse_lookup_by_owner
    WHOIS Reverse Lookup By Owner
  • whoisfreaks.bulk_domain_availability_check
    Bulk Domain Availability Check
  • whoisfreaks.whois_reverse_lookup_by_company
    WHOIS Reverse Lookup By Company

destructive

0

Delete, cancel or archive. Ask first, or deny outright.

  • No destructive actions.
03 · HOW IT WORKS

Whoisfreaks in three steps.

  1. 01Your users connect WhoisfreaksThey add their Whoisfreaks api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, and writes like “bulk DNS Lookup” can wait for the user to approve.
  3. 03Any agent can actYour agent calls Whoisfreaks through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('whoisfreaks', {
  read: 'allow',
  write: 'ask',        // bulk_dns_lookup
  destructive: 'deny',  
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Whoisfreaks connects.

Users add their Whoisfreaks api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Whoisfreaks connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Whoisfreaks from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More developer tools apps.

GitHub896 actionsSupabase129 actions0CodeKit8 actionsAbly25 actionsAbstract3 actionsAddressfinder17 actionsAddresszen2 actionsAlchemy36 actions
ALL DEVELOPER TOOLS APPS →
07 · FAQ

Whoisfreaks and Arc0, answered.

Q01

Can I use Whoisfreaks with Claude, ChatGPT or Cursor?

Yes. Connect Whoisfreaks to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Whoisfreaks actions you allow.

Q02

How do users connect Whoisfreaks?

Users add their Whoisfreaks api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Whoisfreaks actions can my agent take?

17 in total: 1 read, 16 write and 0 destructive, such as “bulk DNS Lookup”. Your policies decide which of them each agent may call.

Q04

Can I make my agent read-only in Whoisfreaks?

Yes. Allow read actions and deny writes in the Whoisfreaks policy. Your agent can still look things up, and any write it attempts is blocked and logged.

Q05

Can my own backend call Whoisfreaks too?

Yes. The same Whoisfreaks connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Whoisfreaks into your agent.

Your users connect Whoisfreaks once, under your brand. Your agent gets 17 actions behind your policies, with every call on the record.

Connect WhoisfreaksBrowse all apps →

Free to build · MCP + REST · Audit log on every plan