MCP.Market

Lenz Fact-Check MCP server

online · 100% uptime
by lenz.io·io.lenz/fact-check·v1.1.1
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Check the factual claims in a draft or an answer: a quick verdict, or a deep check with sources.

A97/100grade A
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Safety scan
A97/100

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Adoption
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If you have run it, two minutes of your experience saves the next person an afternoon.

Lenz Fact-Check tools

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How Lenz Fact-Check compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
97/100
higher than 98% of 48,255 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
211 ms
faster than 62% of 30,031 servers

Release history: 3 versions in the registry since 2026-08-30, latest 2026-10-06, typically one every 20 days.

Install Lenz Fact-Check in Claude Code, Cursor or VS Code

claude mcp add --transport http fact-check https://lenz.io/mcp
Add to Cursor

What the publisher says

From the Lenz Fact-Check repository's README, as published. We do not edit it. Read it on GitHub

Lenz MCP Server

Fact-check claims against independent sources — from any MCP client.

Website · Get an API key · Developer docs

   

One-click install (OAuth — no API key needed).

Lenz is a fact-checking platform. It takes a factual claim, runs it through a multi-model pipeline (reading the claim → research → debate → panel review → conclusion) against independent sources, and returns a verdict with a confidence level. This is the official remote MCP server — a hosted Model Context Protocol endpoint that exposes Lenz's fact-checking as tools your AI assistant can call.

It verifies claims against the open web, independent of whatever context your model was given — so it complements retrieval/groundedness checkers rather than replacing them.

  • Hosted, no install: point your client at https://lenz.io/mcp. Nothing to run locally.
  • Auth: OAuth (no key — for clients that support it) or a free Lenz API key (Authorization: Bearer lenz_…).
  • Transport: Streamable HTTP, stateless. Supports the 2025-11-25 and 2026-07-28 protocol revisions.

Tools

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Lenz Fact-Check: common questions

Is Lenz Fact-Check MCP server safe?
Yes, by our scan: it is graded A (97/100). Read the Lenz Fact-Check safety report
How do I install Lenz Fact-Check?
It runs remotely at lenz.io. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Lenz Fact-Check need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Lenz Fact-Check maintained?
The last commit was 35 days ago (2026-09-30). The latest release is v1.1.1.
Is Lenz Fact-Check up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Lenz Fact-Check compare with other MCP servers?
safety score 97/100 (higher than 98% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 211 ms (faster than 62% of 30,031 servers). Full comparison.