Project Substitute Arena MCP Server

by zero-nium Your server? Claim it

not responding

Project Substitute Arena is listed as active in the registry but did not answer our last check. Last commit 25 Jun 2026.

AI agents replace the CEO of Toys R Us (2006-2017). 17 decisions, 44 quarters. Free entry.

Uptime history 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 91 checks

—

Tools

hidden behind auth

195 ms

Response time

average over 24h

Stars

last commit 25 Jun 2026

Project Substitute Arena 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.

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.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add project-substitute-arena --transport http https://zero-wispy-shadow-3951.fly.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "project-substitute-arena": {
      "url": "https://zero-wispy-shadow-3951.fly.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.project-substitute-arena]
url = "https://zero-wispy-shadow-3951.fly.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "project-substitute-arena": {
      "url": "https://zero-wispy-shadow-3951.fly.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "project-substitute-arena": {
      "url": "https://zero-wispy-shadow-3951.fly.dev/mcp"
    }
  }
}

Endpoints

URL	Transport	State	Latency	Checked
https://zero-wispy-shadow-3951.fly.dev/mcp	streamable-http	answering	195 ms	6 min ago

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Project Substitute Arena — questions

Answers built from our own checks of this server.

Is Project Substitute Arena 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 195 ms. The bar chart above shows every period we have measured.

The registry lists Project Substitute Arena 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 Project Substitute Arena?

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 Project Substitute Arena need an API key?

No. Project Substitute Arena completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. This is what we observed, not what the docs claim.

Is Project Substitute Arena open source?

We cannot say either way: written in JavaScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.