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Machine Inbox MCP server

Which servers in the official MCP registry are Machine Inbox's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-24

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Whose server it is
  • Registry namecom.machineinbox/machine-inboxverified in the MCP registry

The registry name sits under machineinbox.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools11
  • Server calls itselfmachine-inbox
  • Server version0.1.0
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 20 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Keep approval on for delete_webhook, delete_inbox: they delete, send or pay without saying so.
  • create_inbox, set_webhook, delete_webhook, delete_inbox change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 3 of 11 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer562 ms
  • Space in an agent's context≈ 1,441 tokensthe definitions of all its tools (11), which an agent carries on every turn
  • Tool definitionsB · 79 of 100
  • Typed results0 of 11 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 3 of 11
  • Not saying whether it only reads or can destroy: 11 of 11

Worth a look

  • Tools that delete, send or pay without telling the client so: delete_webhook, delete_inbox
  • Tools that change data, on a server that answers without a sign-in: create_inbox, set_webhook, delete_webhook, delete_inbox

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers11 tools · read 2026-10-24
  • get_service_info

    Read the Machine Inbox service instructions: pricing, payment rails, endpoints, and limits.

  • create_inbox

    Request a new paid inbox. Buying requires an out-of-band payment (Stripe MPP or x402 USDC on Base); this tool returns the live HTTP 402 payment challenge plus exact instructions to complete the purchase. Standard inbox: $2.00.

  • get_inbox

    Read an inbox: address, status, expiry, limits, and usage.

  • list_messages

    List messages in an inbox, newest first. Pass after=<newest createdAt seen> to poll for only new mail.

  • get_message

    Fetch one message with parsed text, HTML, and attachment download URLs.

  • get_verification_code

    Extract the newest one-time verification code or confirmation link from inbound mail. Ideal for signup and login flows.

  • reply_to_message

    Send an included plain-text reply to the authenticated sender of an inbound message.

  • set_webhook

    Register or replace the inbox webhook: an HMAC-signed POST fires on every inbound message with metadata, extracted verification codes, and injection risk (never the body). Returns the signing secret.

  • get_webhook

    Read the inbox webhook state: URL, delivery counters, and whether it is disabled. The secret is only returned by set_webhook.

  • delete_webhook

    Remove the inbox webhook.

  • delete_inbox

    Delete an inbox: revokes the token and erases stored mail.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "machine-inbox": {
      "type": "http",
      "url": "https://machineinbox.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http machineinbox https://machineinbox.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://machineinbox.com/mcp as a custom connector in the settings.

OpenAPI spec

13 paths, read 2026-10-24. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.