DomainCat MCP Server

by domaincat Your server? Claim it

answering

DomainCat is answering right now. Last checked moments ago.

Monitor SSL certs (incl. origin behind Cloudflare), domain expiry, DNS, email auth and blacklists.

Uptime history 23 hours of history

23 hours agonow

100.0%

Uptime 24h

86 of 86 checks

—

Tools

hidden behind auth

130 ms

Response time

average over 24h

authentication required

Access

streamable-http

Nothing serious here today

Today is the operative word: we check DomainCat every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add domaincat --transport http https://domaincat.app/api/mcp

Settings → Connectors → Add custom connector, then paste this address

https://domaincat.app/api/mcp

~/.codex/config.toml

[mcp_servers.domaincat]
url = "https://domaincat.app/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "domaincat": {
      "url": "https://domaincat.app/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "domaincat": {
      "type": "http",
      "url": "https://domaincat.app/api/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Endpoints

URL	Transport	State	Latency	Checked
https://domaincat.app/api/mcp	streamable-http	needs auth	88 ms	0 min ago

Alternatives to DomainCat

same job, measured the same way

Upcheck

by upcheck

Monitor website uptime, SSL certificates, DNS, domain expiry and page changes, and manage alerts.

answering

ExpiryOwl

by expiryowl

SSL certificate, domain expiry, DNS and uptime monitoring for web agencies, grouped by client.

answering

Brand Monitor

by erikirby

Monitor domain expiry, SSL certs, and social handle availability across platforms.

36 installs/wk local only

Monitoring

by pingvera

Client-website monitoring for agencies: uptime, incidents, SSL/domain expiry, server metrics.

answering

Infra Health & SSL Monitor MCP

by ansarii

Monitors TLS/SSL certificate expiry, DNS resolution, and TCP port status for AI agents.

answering

InfraNest

by infranest

Your servers, monitors, incidents, DNS, domains and certificates in InfraNest, in your AI assistant.

answering

Sentinel

by rootstuff

Uptime, SSL, DNS and domain monitoring you can talk to from Claude or any MCP client.

answering

Palisade

by palisade

Monitor and manage email authentication (SPF, DKIM, DMARC, MTA-STS, BIMI) for your domains.

321 installs/wk answering

DomainCat — questions

Answers built from our own checks of this server.

Why is there no tool list for DomainCat?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is DomainCat working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 86 of 86 checks got a reply (100.0%), average response time 130 ms. The bar chart above shows every period we have measured.

How do I connect DomainCat?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does DomainCat need an API key?

Yes. Every time we knock, DomainCat answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is DomainCat?

It answers our handshake in 130 ms on average, which is faster than 86% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.