Yes, Callchatsyn is free to use.

How do I install Callchatsyn?

Callchatsyn is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is Callchatsyn safe to use?

Yes. Callchatsyn passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Callchatsyn?

Callchatsyn uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Callchatsyn MCP Server

by Oneappsworld

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

Answer small-business customer questions from FAQs, list open appointment times, and book them.

About

Answer small-business customer questions from FAQs, list open appointment times, and book them.

Remote endpoints: streamable-http: https://callchatsyn.com/api/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (3 strong, 5 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

3 tools verified · Open access · No issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Applies to the server that hosts this plugin, not to your machine.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "com-callchatsyn-callchatsyn": {
      "url": "https://callchatsyn.com/api/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

CallChatSyn MCP server

Let an AI assistant (Claude, Cursor, any MCP client) answer customer questions and book appointments for a small business, using that business's own FAQs and opening hours on CallChatSyn.

Free for the first 1,000 businesses (founder offer: 100 API calls a day, 2,000 a month).

Tools

Tool	Changes data?	What it does
`answer_customer_question`	No (read-only)	Answers from the business's FAQs and order data (English/Chinese); flags booking and "talk to a person" requests
`list_open_times`	No (read-only)	Next open times (up to 5, next 7 days) in the business's time zone, plus services and locations; from CallChatSyn hours or the business's connected Cal.com
`book_appointment`	Yes, creates a booking	Books one of those times and returns its `id`; the business is notified and, with Cal.com connected, the booking is created there. Not idempotent. Demo key = dry run
`cancel_appointment`	Yes, cancels a booking	Cancels a booking by `id` (also in Cal.com if connected). To reschedule: cancel, then book a new time. Demo key = dry run

Remote server (nothing to install)

Add this URL as a custom connector (Claude: Settings → Connectors → Add custom connector; Cursor and others: a Streamable HTTP server):

https://callchatsyn.com/api/mcp

Without a key it uses the demo business. To act for your own business, send the header Authorization: Bearer ccs_live_.... Also listed in the official MCP Registry as com.callchatsyn/callchatsyn.

Local setup (npx)

Create a CallChatSyn account, add FAQs and opening hours, then Dashboard → Developers → claim founder access → create an API key.
Add to your MCP client config:

{
  "mcpServers": {
    "callchatsyn": {
      "command": "npx",
      "args": ["-y", "github:oneappsworld/callchatsyn-mcp"],
      "env": { "CALLCHATSYN_API_KEY": "ccs_live_..." }
    }
  }
}

Keep the key private; it acts for one business.

No key yet? Leave CALLCHATSYN_API_KEY out and the server uses the public demo key (ccs_demo_public): answers come from a demo business and bookings are dry runs, so you can try every tool before signing up.

Notes

Answers are rule-based FAQ matching (fast, predictable), not free-form generation.
API docs and OpenAPI spec: https://callchatsyn.com/developers · https://callchatsyn.com/openapi.json

MIT licensed.

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