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probe402 MCP Server

by probe402 Your server? Claim it
answering

probe402 is answering right now. Last checked 10 min ago. It exposes 2 tools.

Independent health, price and history for x402/MPP endpoints. Metered over x402; free grade on web.

Uptime history 25 days of history
25 days agonow
100.0%
Uptime 24h
91 of 91 checks
2
Tools
read from the server
2420 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 2 September 2026. No other catalogue keeps this.

15 Sep 2 tool descriptions were rewritten probe402_endpoint_grade, probe402_endpoint_history
3 Sep a tool description was rewritten probe402_endpoint_grade
2 Sep 2 tool descriptions were rewritten probe402_endpoint_grade, probe402_endpoint_history

Nothing serious here today

Today is the operative word: we check probe402 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 endpoint-history --transport http https://probe402.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "endpoint-history": {
      "url": "https://probe402.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.endpoint-history]
url = "https://probe402.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "endpoint-history": {
      "url": "https://probe402.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "endpoint-history": {
      "url": "https://probe402.com/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.

probe402
probe402_endpoint_grade
The Machine Commerce Observatory: independent readings of x402 and MPP endpoints — alive right now, quoting what, and how fast? Probed on a fixed clock under one published rubric, every reading traceable to a retained capture. Blocked and rate-limited are told apart from unreachable at capture time, so a defended endpoint is never reported as dead. Call before paying an unfamiliar endpoint, or to check whether one you use has repriced or rotated its payTo. This tool is the FREE grade: current observation plus 7 days of counts. The same record our published reports are written from.
probe402_endpoint_history
The Machine Commerce Observatory: independent readings of x402 and MPP endpoints — alive right now, quoting what, and how fast? Probed on a fixed clock under one published rubric, every reading traceable to a retained capture. Blocked and rate-limited are told apart from unreachable at capture time, so a defended endpoint is never reported as dead. Call before paying an unfamiliar endpoint, or to check whether one you use has repriced or rotated its payTo.

Endpoints

URLTransportStateLatencyChecked
https://probe402.com/mcp streamable-http answering 3600 ms 10 min ago

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same job, measured the same way
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Independent A-F trust grade for any MCP server, watched for drift. Free, never for sale.

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by attestagents

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probe402 — questions

Answers built from our own checks of this server.

What can probe402 do?
It exposes 2 tools, read directly from the server on our last check. Among them: probe402_endpoint_grade, probe402_endpoint_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 probe402 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 2420 ms. The bar chart above shows every period we have measured.
How do I connect probe402?
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 probe402 need an API key?
No. probe402 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.