mcpbeat

Lenz Fact-Check MCP Server

io.lenz/fact-check
answering

Lenz Fact-Check is answering right now. Last checked 9 min ago. Last commit 6 Jul 2026.

Fact-check claims against independent sources — fast verdict or deep multi-step investigation.

Uptime history 45 hours of history
45 hours agonow
100.0%
Uptime 24h
91 of 91 checks
—
Tools
hidden behind auth
245 ms
Response time
average over 24h
0
Stars
last commit 6 Jul 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

run in your terminal
claude mcp add fact-check --transport http https://lenz.io/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "fact-check": {
      "url": "https://lenz.io/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.fact-check]
url = "https://lenz.io/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "fact-check": {
      "url": "https://lenz.io/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "fact-check": {
      "url": "https://lenz.io/mcp"
    }
  }
}

This endpoint answered with an authorization challenge — the server is running, but you need an API key or OAuth to use it.

Endpoints

URLTransportStateLatencyChecked
https://lenz.io/mcp streamable-http needs key 248 ms 9 min ago

Lenz Fact-Check — questions

Answers built from our own checks of this server.

Why is there no tool list for Lenz Fact-Check?
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 Lenz Fact-Check working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 245 ms. The bar chart above shows every period we have measured.
How do I connect Lenz Fact-Check?
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 key or an OAuth login: it refuses anonymous clients.
Does Lenz Fact-Check need an API key?
Yes. Every time we knock, Lenz Fact-Check 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 Lenz Fact-Check?
It answers our handshake in 245 ms on average, which is faster than 54% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Lenz Fact-Check open source?
Yes — it is published under the Apache-2.0 licence, written in Shell and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.