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ReactionMetric MCP Server

answering

ReactionMetric MCP is answering right now. Last checked 6 min ago. It exposes 2 tools.

Five-trial reaction-time summary and links to browser-based reaction tests.

Uptime history 9 days of history
9 days agonow
100.0%
Uptime 24h
91 of 91 checks
2
Tools
read from the server
151 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check ReactionMetric MCP 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 6 min ago.

run in your terminal
claude mcp add reactionmetric-mcp --transport http https://reactionmetric.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://reactionmetric.com/mcp
~/.codex/config.toml
[mcp_servers.reactionmetric-mcp]
url = "https://reactionmetric.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "reactionmetric-mcp": {
      "url": "https://reactionmetric.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "reactionmetric-mcp": {
      "type": "http",
      "url": "https://reactionmetric.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.

reaction
find_reaction_test
Find the matching ReactionMetric browser test page.
summarize
summarize_reaction_trials
Calculate a transparent median of five user-supplied valid browser-observed reaction times in milliseconds; no calibration or population percentile claims.

Endpoints

URLTransportStateLatencyChecked
https://reactionmetric.com/mcp streamable-http answering 255 ms 6 min ago

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ReactionMetric MCP — questions

Answers built from our own checks of this server.

What can ReactionMetric MCP do?
It exposes 2 tools, read directly from the server on our last check. Among them: find_reaction_test, summarize_reaction_trials. 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 ReactionMetric MCP 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 151 ms. The bar chart above shows every period we have measured.
How do I connect ReactionMetric MCP?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does ReactionMetric MCP need an API key?
No. ReactionMetric MCP 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 ReactionMetric MCP?
It answers our handshake in 151 ms on average, which is faster than 88% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.