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CalKit MCP Server

answering

CalKit is answering right now. Last checked 3 min ago. Last commit 15 Oct 2026.

Public holidays for 150+ countries, business-day maths and timezone lookup

Uptime history 46 hours of history
46 hours agonow
100.0%
Uptime 24h
92 of 92 checks
—
Tools
hidden behind auth
638 ms
Response time
average over 24h
0
Stars
last commit 15 Oct 2026

Nothing serious here today

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

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

run in your terminal
claude mcp add calkit --transport http https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "calkit": {
      "url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.calkit]
url = "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "calkit": {
      "url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "calkit": {
      "url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp"
    }
  }
}

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

Endpoints

URLTransportStateLatencyChecked
https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp streamable-http needs auth 361 ms 3 min ago

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CalKit — questions

Answers built from our own checks of this server.

Why is there no tool list for CalKit?
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 CalKit working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 638 ms. The bar chart above shows every period we have measured.
How do I connect CalKit?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path 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 CalKit need an API key?
Yes. Every time we knock, CalKit 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 CalKit?
It answers our handshake in 638 ms on average, which is faster than 16% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is CalKit open source?
We cannot say either way: written in Python and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.