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Sentinel MCP Server

answering

Sentinel is answering right now. Last checked 10 min ago. It exposes 2 tools.

Pay-per-call safety checks for AI agents: screen a crypto address or URL before you transact.

Uptime history 47 days of history
47 days agonow
100.0%
Uptime 24h
91 of 91 checks
2
Tools
read from the server
253 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Sentinel 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 10 min ago.

run in your terminal
claude mcp add sentinel --transport http https://448c.org/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "sentinel": {
      "url": "https://448c.org/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.sentinel]
url = "https://448c.org/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "sentinel": {
      "url": "https://448c.org/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "sentinel": {
      "url": "https://448c.org/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

address
check_address
Check whether a crypto address is safe to transact with. Screens OFAC sanctions + community scam lists and flags contract-vs-wallet. Returns verdict (safe/caution/avoid), 0-100 risk score, reasons, and sources.
url
check_url
Check whether a URL or domain is a scam/phishing site. Screens the MetaMask crypto-phishing blocklist, domain age (RDAP), and lexical red flags. Returns verdict (safe/caution/avoid), 0-100 risk score, reasons, and sources.

Endpoints

URLTransportStateLatencyChecked
https://448c.org/mcp streamable-http answering 201 ms 10 min ago

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same job, measured the same way
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Sentinel — questions

Answers built from our own checks of this server.

What can Sentinel do?
It exposes 2 tools, read directly from the server on our last check. Among them: check_address, check_url. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Sentinel 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 253 ms. The bar chart above shows every period we have measured.
How do I connect Sentinel?
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.
Does Sentinel need an API key?
No. Sentinel completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Sentinel?
It answers our handshake in 253 ms on average, which is faster than 56% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.