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EmptyInbox MCP Server

local only

EmptyInbox runs on your own machine — the client starts it, so there is no endpoint to ping. 459 installs a week from npm. Last commit 18 Sep 2026.

Zero-config disposable email inboxes for AI agents: create, read mail, await verify codes.

Installs per day peak 291 · avg 18 · +7243% w/w
a month agotoday
459
Installs / week
npm · emptyinbox-mcp
4
Stars
4 open issues
18 Sep 2026
Last commit
0 releases in 90 days
License
HTML

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

  <script src="https://blockonomics.co/js/web3-payment.js"></script>
Page executes code built at runtime static/pay.html:218
        $('qr').innerHTML = code.createSvgTag({ cellSize: 4, margin: 0, scalable: true });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add emptyinbox -- npx -y emptyinbox-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "emptyinbox": {
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.emptyinbox]
command = "npx"
args = ["-y", "emptyinbox-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "emptyinbox": {
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "emptyinbox": {
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: EMPTYINBOX_API_KEY (Existing EmptyInbox API key. Omit to auto-register a free account on the first tool call that needs one; the key is then written to ~/.emptyinbox.json.). The author declared them in the registry entry; get the values from the project itself.

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EmptyInbox — questions

Answers built from our own checks of this server.

Why is there no uptime for EmptyInbox?
EmptyInbox runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package emptyinbox-mcp was installed 459 times last week.
How do I connect EmptyInbox?
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 runs locally, so the command pulls emptyinbox-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use EmptyInbox?
The npm package emptyinbox-mcp was installed 459 times in the last week. Week over week that is +7243%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is EmptyInbox open source?
We cannot say either way: written in HTML, 4 stars on GitHub and 4 open issues, but we could not determine the licence, and without one the code is not open source by default.