EmptyInbox

Name: EmptyInbox
Author: blockonomics

by blockonomicsversion 1.5.0i★ –iRuns on your computer

Registry nameio.github.cnohall/emptyinbox

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi0 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Chat & email
You need to fill in: EMPTYINBOX_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 0 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: EMPTYINBOX_API_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "emptyinbox": {
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "env": {
        "EMPTYINBOX_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add emptyinbox --env EMPTYINBOX_API_KEY=your-value -- npx -y emptyinbox-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "emptyinbox": {
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "env": {
        "EMPTYINBOX_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "emptyinbox": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ],
      "env": {
        "EMPTYINBOX_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

EMPTYINBOX_API_KEY secret env
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.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

! Caution
Maker matches the repo
The publisher (cnohall) is not the repo owner (blockonomics); someone else may have listed it
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Chat & emaili

More stars than 0% of the other 1771 servers in this category
Published to the registry more recently than 47% of the other 1771 servers in this category
Basic checks equal to or better than 35% of the other 1771 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is EmptyInbox safe?

It passed 0 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: EMPTYINBOX_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.5.0) reached the registry 29 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by Vexa-ai

Meeting bot and transcripts for Google Meet, Teams and Zoom. Live or after, speakers labelled.

Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

Install

emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 31 days ago

Install

MCP WhatsApp Cloud

by codespar

MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

emptyinbox-mcp

MCP server for EmptyInbox — create disposable email inboxes and read messages from AI agents.

Listed in the official MCP Registry as io.github.cnohall/emptyinbox.

Setup

Claude Code:

claude mcp add emptyinbox -- npx -y emptyinbox-mcp@latest

Any other MCP client — add to its config:

"mcpServers": { "emptyinbox": { "command": "npx", "args": ["-y", "emptyinbox-mcp@latest"] } } }

No setup: the first tool call that needs an account registers one automatically and saves the key to ~/.emptyinbox.json for future sessions. Starting the server on its own (as MCP hosts do to list tools) creates nothing.

Bring your own account (optional — to reuse an existing key):

"mcpServers": { "emptyinbox": { "command": "npx", "args": ["-y", "emptyinbox-mcp@latest"], "env": { "EMPTYINBOX_API_KEY": "your_api_key_here" } } } }

Get an API key at https://emptyinbox.me/settings.html

Tools

Tool	Description
`create_inbox`	Create a new email address; it expires after 30 days unless kept
`list_inboxes`	List all inboxes on your account
`list_messages`	List received messages, each with its extracted code, action link and text preview
`get_message`	Get one message parsed (code, links, plain text), or `format="text"` for a flat rendering
`wait_for_message`	Block until an email arrives — perfect for signup/OTP flows; returns the extracted code with it
`get_quota`	Credits remaining on the account
`list_bundles`	List quota bundles and prices
`buy_quota`	Quote a Bitcoin payment; returns a `pay_url` for the user plus address, amount and BIP21 URI
`check_payment`	Check whether a payment landed and quota was credited
`keep_inbox`	Make an inbox permanent (30 credits) so it keeps receiving mail, e.g. password resets
`report_issue`	Send a bug, payment problem, docs gap or feature request to the team; never creates an account

Example agent workflow

1. create_inbox → "clever.sunny.butterfly@emptyinbox.me"

[agent signs up to some service using that address]
wait_for_message(inbox="clever.sunny.butterfly@emptyinbox.me", timeout_seconds=60)
→ returns the verification email with code/link

Payment

Every account starts with free inboxes. When they run out, create_inbox returns the prices and the agent can close the purchase without leaving the session:

the agent shows its user the bundles and the user picks one
buy_quota returns a pay_url — a page with a QR code, the exact amount and live status — plus the raw address, amount and BIP21 URI
the user pays from any Bitcoin wallet (or an agent with its own wallet pays the BIP21 URI)
check_payment with wait_seconds confirms the credit, usually within seconds of broadcast

buy_quota takes either a bundle id from list_bundles or a custom whole-dollar usd amount from $1 to $100, for an agent spending down whatever a wallet holds. A custom amount is priced at the best bundle rate it qualifies for. The network fee the payer adds on top is the same whatever the size of the payment, so it eats a far larger share of a dollar-sized top-up.

Quota is granted as soon as the payment is seen on the network, so there is no waiting for confirmations. Humans can also buy at https://emptyinbox.me/inboxes.html

EmptyInbox

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

emptyinbox-mcp

Setup

Tools

Example agent workflow

Payment