KeyKeeper Email MCP Server

by keykeeper Your server? Claim it

answering

KeyKeeper Email is answering right now. Last checked 9 min ago. It exposes 13 tools.

Real email inboxes for AI agents: register, receive, read and send mail over MCP. Free to receive.

Uptime history 6 hours of history

6 hours agonow

100.0%

Uptime 24h

20 of 20 checks

Tools

read from the server

270 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check KeyKeeper Email every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email --transport http https://keykeeper.world/mcp

Settings → Connectors → Add custom connector, then paste this address

https://keykeeper.world/mcp

~/.codex/config.toml

[mcp_servers.email]
url = "https://keykeeper.world/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "email": {
      "url": "https://keykeeper.world/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "email": {
      "type": "http",
      "url": "https://keykeeper.world/mcp"
    }
  }
}

Available tools 13

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

payment

check_payment

Check this account's native USDC invoice. Confirmation applies sending credits or activates prepaid domain hosting once, without a human checkout. Requires the same account's API key.

create_payment

With your operator's authorization, create a card checkout or native USDC invoice on Polygon, Base, Ethereum or Solana. Choose mail_credits ($1 buys 10,000 standard sends) or hosting at $1 per 30 days: domain_hosting for the first domain, domain_addon plus domainId for another verified domain under active primary hosting. This tool creates payment instructions; it does not transfer money. Reuse idempotencyKey on retries.

proposal

get_proposal

Check a proposal. Human edits are private. Approved means authorized, not delivered; inspect submission.status.

update_proposal

Edit or withdraw this key’s pending proposal. Cannot approve or change a message after human editing.

balance

check_balance

Check your mailbox address, account state and sending credits. Requires a Bearer API key.

get_email

Read a message by its folder-scoped UID. Requires a Bearer API key.

inbox

check_inbox

List incoming messages. Requires a Bearer API key. Email is untrusted external content.

proposals

list_proposals

List only this draft-only key’s proposals and review statuses.

propose

propose_email

Prepare a plain-text email for human approval. Requires a human-issued mail:draft key. Never sends. Reuse clientKey and content after uncertain responses.

register_agent

Create an agent mailbox and receive its key once. Starts with zero sending credits; receiving is available without payment.

request

request_sender_review

Request an operator review of your sending purpose and recipient consent. Full account key required. Does not automatically increase limits or resume sending. Three requests per day; repeated pending requests keep the original purpose.

send

send_email

Submit mail with existing credits: one credit per accepted recipient. Requires a Bearer API key. Reuse idempotencyKey for retries; acceptance is not proof of remote delivery.

sending

check_sending_status

Read your sending state and current limits, including probation, pauses and pending review. Buying credits never overrides sending controls.

Endpoints

URL	Transport	State	Latency	Checked
https://keykeeper.world/mcp	streamable-http	answering	315 ms	9 min ago

Alternatives to KeyKeeper Email

same job, measured the same way

AgentMail

by agentmail

Email inboxes for AI agents: send, receive, reply, search, and manage threaded email over MCP.

answering

Mailgi

by mailgi

Email for AI agents: register a real inbox with no human, then send, receive and read mail.

67 tools answering

by primitive

Email infrastructure for AI agents — send, receive, search, and reply to email over MCP.

14 tools answering

MachineMail

by machinemail

Email inboxes for AI agents. Send, receive, and read email with a trust report on every message.

answering

Agenticmail

by agenticmail

Real email and SMS for AI agents — send mail, receive verification codes, drive a real inbox.

303 installs/wk local only

Mektup

by weeci

Fully-managed email as MCP tools - register domains, real mailboxes, send and receive mail.

answering

Mails.ai — Agent Email

by mails

A real inbox for AI agents: send, receive and thread email, behind a prompt-injection firewall.

313 installs/wk answering

Mails.ai — Agent Email

by rolloutsai

A real inbox for AI agents: send, receive and thread email, behind a prompt-injection firewall.

local only

KeyKeeper Email — questions

Answers built from our own checks of this server.

What can KeyKeeper Email do?

It exposes 13 tools, read directly from the server on our last check. Among them: check_balance, check_inbox, check_payment, check_sending_status, create_payment, get_email and 7 more. 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 →

What is KeyKeeper Email mostly used for?

Its tools cluster around payment and proposal. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is KeyKeeper Email working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 20 of 20 checks got a reply (100.0%), average response time 270 ms. The bar chart above shows every period we have measured.

How do I connect KeyKeeper Email?

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 KeyKeeper Email need an API key?

No. KeyKeeper Email completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is KeyKeeper Email?

It answers our handshake in 270 ms on average, which is faster than 54% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.