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Sentinel 402 MCP Server

by verifiedky Your server? Claim it
not responding

Sentinel 402 is listed as active in the registry but did not answer our last check. It exposes 4 tools.

Independent uptime oracle for the x402 agent economy. Free probes, paid history via USDC on Base.

Uptime history 27 days of history · worst day 0%
27 days agonow
0.0%
Uptime 24h
0 of 91 checks
4
Tools
read from the server
134 ms
Response time
average over 24h
open, no key
Access
streamable-http

Sentinel 402 does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

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 4 min ago.

run in your terminal
claude mcp add sentinel-402 --transport http https://mcp.verifiedky.xyz/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "sentinel-402": {
      "url": "https://mcp.verifiedky.xyz/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.sentinel-402]
url = "https://mcp.verifiedky.xyz/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "sentinel-402": {
      "url": "https://mcp.verifiedky.xyz/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "sentinel-402": {
      "url": "https://mcp.verifiedky.xyz/mcp"
    }
  }
}

Available tools 4

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

monitor
add_monitor
Self-serve: add an https:// x402 endpoint to the SENTINEL-402 watch fleet (free forever, probed every 15 min).
monitor_status
Rolling probe window (last 200 probes) for one monitored service by monitor_id. Free.
fleet
fleet_status
Live trust snapshot of every monitored x402 service: uptime %, avg latency ms, last-seen, x402 discovery flag. Free.
watch
watch_history
PAID ($0.01+ USDC on Base): full raw probe history for one service. Send USDC to payTo wallet in /.well-known/x402.json, then pass your tx hash.

Endpoints

URLTransportStateLatencyChecked
https://mcp.verifiedky.xyz/mcp streamable-http answering 134 ms 4 min ago

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same job, measured the same way
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Fatstack
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Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.

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Sentinel 402 — questions

Answers built from our own checks of this server.

What can Sentinel 402 do?
It exposes 4 tools, read directly from the server on our last check. Among them: add_monitor, fleet_status, monitor_status, watch_history. 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 402 working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 134 ms. The bar chart above shows every period we have measured.
The registry lists Sentinel 402 as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Sentinel 402?
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 402 need an API key?
No. Sentinel 402 completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.