Lenz Fact-Check is answering right now. Last checked 2 min ago. Last commit 21 Sep 2026.
Check the factual claims in a draft or an answer: a quick verdict, or a deep check with sources.
We read the source, 9 h ago · rules 3dff92dd89df
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
…ked"?_=p:l&&typeof p!="function"||f[u]===p||de(e,u,p,f[u],s);if(h)l||m&&(h.__html==m.__html||h.__html==e.innerHTML)||(e.innerHTML=h.__html),t.__k=[];else if(m&&(e.innerHTML=""),qt(t.type=="template"?e.content:e,ve(c)?c:[c],t,r,n,y=="foreignObject"?"http://www.w3.org/1999/xhtml":s…
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.
claude mcp add fact-check --transport http https://lenz.io/mcp
{
"mcpServers": {
"fact-check": {
"url": "https://lenz.io/mcp"
}
}
}
[mcp_servers.fact-check]
url = "https://lenz.io/mcp"
{
"mcpServers": {
"fact-check": {
"url": "https://lenz.io/mcp"
}
}
}
{
"mcpServers": {
"fact-check": {
"url": "https://lenz.io/mcp"
}
}
}
This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://lenz.io/mcp | streamable-http | sign-in | 262 ms | 2 min ago |
Independent fact-checking for AI answers: a verdict and sources for every claim.
Real-time fact-checking MCP. Verifies claims against live sources with structured verdicts.
Fact-check claims against live web sources: verdict, consensus, cited sources, PII redaction.
Fact-check any claim with live web sources. Ed25519-signed receipts. Catches hallucinations.
Check claims against a fact-store: consistent, contradicts, or unverifiable — with a receipt.
Verifiable fact-checking: verdict, confidence, sources, and a tamper-evident certificate.
Sub-cent factual claim verification against live data sources.
Sub-cent factual claim verification against live data sources.
Answers built from our own checks of this server.