ExpressNumber

npx add-mcp 'https://www.expressnumber.com/api/mcp'

Let your AI assistant read your texts.

Claude, ChatGPT, Cursor and other assistants can list your numbers, read your newest texts and add a number when you say so. Nothing to install: add one address and sign in. No key to copy.

The fastest way.

In ChatGPT or Claude, it takes three steps.

1. Add a custom connector.
2. Use this address: https://www.expressnumber.com/api/mcp
3. Sign in to ExpressNumber and press Approve.

That is all. You can remove the connector any time in Settings. Using Cursor, Claude Code or Claude Desktop, or prefer a key? Use the steps below.

Three things it can do.

list_numbers

See your numbers

Lists the numbers on your account with their area code, mode and whether they are live. Ask: "Which numbers do I have?"

get_latest_messages

Read your texts

Reads your newest texts with the sender and the time. Ask: "What did my last text say?"

get_new_number

Get a new number

Adds a number to your account. The assistant has to ask you first, every time, and the same plan rules apply as on the website.

How to connect it.

With a key instead of signing in: make one once, then add the server to the app you use.

Step 1

Make a key

• Sign in and open Settings.
• Under “Connect an AI assistant”, name the key after the app, then press Make key.
• Copy it. It is shown once.

Open Settings

Step 2

Use these two things

• Server address: https://www.expressnumber.com/api/mcp
• Header: Authorization: Bearer <your key>

Then follow the steps for your app below.

Claude Desktop

Open Settings, then Developer, then Edit Config, and add this. It needs Node.js installed. Restart Claude Desktop afterwards.

{
  "mcpServers": {
    "expressnumber": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://www.expressnumber.com/api/mcp",
        "--header",
        "Authorization: Bearer <your key>"
      ]
    }
  }
}

Claude Code

Run this once in your terminal.

claude mcp add --transport http expressnumber https://www.expressnumber.com/api/mcp --header "Authorization: Bearer <your key>"

Cursor

Open Cursor Settings, then MCP, add a server, and paste this into the file it opens.

{
  "mcpServers": {
    "expressnumber": {
      "url": "https://www.expressnumber.com/api/mcp",
      "headers": {
        "Authorization": "Bearer <your key>"
      }
    }
  }
}

ChatGPT (developer mode)

• Open Settings, then Connectors, then Advanced, and turn on Developer mode.
• Create a connector and paste the server address above.
• Choose sign-in (OAuth) when it asks, press Connect, and approve on our page. No key needed.
• To use a key instead, choose the option that takes an API key or access token and paste your key.

Menus change from one plan to the next. The address and the sign-in are always the same.

Good to know.

• Adding a number always asks you first. The assistant is told never to do it on its own.
• Receive only. The assistant cannot send texts, place calls, release a number or change a plan.
• Each assistant gets its own key. Signing in makes it for you, named after the assistant. Revoke a key in Settings and that assistant stops working at once.
• We keep only a one-way fingerprint of your key, so we cannot show it to you again. Lost it? Revoke it and make a new one.
• Texts are written by whoever sent them. Your assistant is told to read them as information, never as instructions.

Questions? Write to support@expressnumber.com. Everything else about the numbers is in the FAQ.