Connectors Guide

Connector from the MCP registry

KaiCalls

A phone number for your business or your AI agent. Kai answers it and calls businesses for you.

The address

https://www.kaicalls.com/api/mcp
https://www.kaicalls.com/api/mcp/acquisition
Transport
Streamable HTTP
Sign-in
Optionally, a key in the X-KaiCalls-API-Key header. The publisher says: "Optional KaiCalls API key (kc_live_...) from Settings > API Keys. Omit it to sign in with OAuth 2.1 instead."
Published by
kaicalls.com (domain checked by the registry)
Registry name
com.kaicalls/kaicalls, version 1.1.0
In the registry since
21 June 2026

How to add KaiCalls to Claude

  1. In Claude on the web or desktop, open Customize, then Connectors (Settings > Connectors in some versions).
  2. Press + Add, then Add custom connector.
  3. Name it KaiCalls, paste the address and press Continue.
  4. Under Request headers, add the header X-KaiCalls-API-Key with the value YOUR_KEY. Press Add. The registry entry does not say the format; a header like this usually takes the key alone, but check the publisher's docs. The registry entry says the key is optional: you can also leave the header out and sign in when you connect.
  5. Press Connect next to it and sign in if it asks.
  6. In a chat, press +, then Connectors, to switch it on.

On your phone: connectors belong to your Claude account. Add it once on claude.ai or in the desktop app, and it is in the Claude app for iPhone and Android too: in a chat, press +, then Connectors, and switch it on.

Claude's free plan allows one custom connector; paid plans allow more. On Team and Enterprise plans an owner adds it once under Organization settings > Connectors, and each member then presses Connect. Claude's help page

How to add it to ChatGPT

  1. On chatgpt.com, on a Plus, Pro, Business, Enterprise or Edu plan, turn on Developer mode (Settings > Security and login, or Settings > Apps > Advanced settings in some versions).
  2. Open Settings > Apps and create an app (the + or Create button).
  3. Name it KaiCalls, paste the address, choose OAuth (or No authentication if the server is open) and press Create.
  4. Sign in when it asks.
  5. In a new chat, press + and pick KaiCalls.

ChatGPT's custom apps cannot send a key header; choose OAuth, which the registry entry says this server also offers.

ChatGPT's menus move now and then; the idea stays the same: a new app, this address, OAuth. On business plans an admin may have to allow custom apps first.

Claude Code

claude mcp add --transport http kaicalls https://www.kaicalls.com/api/mcp --header "X-KaiCalls-API-Key: YOUR_KEY"

The registry entry does not say the format; a header like this usually takes the key alone, but check the publisher's docs. The key is optional here: leave out --header and run /mcp to sign in instead.

Source

This page is made from the official MCP registry on 30 October 2026 and has not been checked by hand. A connector acts as you: check who publishes it before you connect anything that can change your data.