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How to connect Coinmarketcal to Claude

Connect Claude Web, Desktop and Cowork to Coinmarketcal MCP. Show upcoming bitcoin-related events this week, list major crypto conferences in june, and more using natural language, with authentication handled for you.

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CoinMarketCal is a community-powered crypto calendar for upcoming events, announcements, and releases. It helps traders track market-moving developments and stay ahead in the crypto space.

3 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Coinmarketcal account to Claude via Composio Connect, enabling it to show upcoming Bitcoin-related events this week, list major crypto conferences in June, find new coin launches happening today, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Coinmarketcal with

OpenAI Agents SDKClaude Agent SDKClaude CodeCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Coinmarketcal to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Coinmarketcal account

Back in Claude, ask it to connect to Coinmarketcal or give it any Coinmarketcal-related task.

For example, ask Claude to:

  • "Show upcoming Bitcoin-related events this week"
  • "List major crypto conferences in June"
  • "Find new coin launches happening today"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Coinmarketcal account is ready to use.

What is the Coinmarketcal Claude Connector, and what's possible with it?

The Coinmarketcal MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Coinmarketcal account. It provides structured and secure access to the Coinmarketcal crypto events calendar, so your agent can perform actions like fetching upcoming cryptocurrency events, discovering new project launches, and tracking market-impacting announcements on your behalf.

  • Fetch upcoming crypto events: Ask your agent to retrieve a list of scheduled events, announcements, or coin releases that could impact the crypto markets.
  • Discover project launches and updates: Stay on top of new token launches, hard forks, or upgrade announcements directly from Coinmarketcal’s trusted community-driven calendar.
  • Track market-impacting news: Let your agent monitor important developments and milestone events for specific coins or across the entire crypto ecosystem.
  • Stay informed on trending events: Quickly surface the most anticipated or discussed crypto events, enabling smarter trading and investment decisions.

Troubleshooting

1. Why does Claude not use the Composio connector for Coinmarketcal?

The connector can show as connected, but Claude must use it in each Coinmarketcal conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Coinmarketcal again.

2. Why does Claude show an MCP server error before Coinmarketcal connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Coinmarketcal.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Coinmarketcal.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Coinmarketcal authorization link not work?

The Composio connector is one server. Your Coinmarketcal account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Coinmarketcal connection.
  • Composio creates a fresh Coinmarketcal authorization link.
  • Open that link in your browser and finish the Coinmarketcal sign-in.

4. Why do Coinmarketcal actions fail after they worked before?

The Coinmarketcal connection can expire or lose permission.

  • Ask Claude to inspect the Coinmarketcal connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Coinmarketcal account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Coinmarketcal.
  • If the action still fails with a permission error, check that the connected account has that permission in Coinmarketcal itself.

5. How do I switch to a different Coinmarketcal account?

Claude can manage the Coinmarketcal connection for you.

  • Ask Claude to disconnect or delete the current Coinmarketcal account.
  • Ask Claude to connect Coinmarketcal again.
  • Open the new Composio authorization link for Coinmarketcal.
  • Sign in with the other Coinmarketcal account in the browser.
  • After the account connects, ask Claude to retry the Coinmarketcal task.

6. Why is my Coinmarketcal connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Coinmarketcal connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Coinmarketcal tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Coinmarketcal.
TOOLS

Supported Tools

Every Coinmarketcal action and event your agent gets out of the box.

List Coins

Tool to retrieve list of all available coins/cryptocurrencies in CoinMarketCal database.

List Event Categories

Tool to list all event categories.

List Cryptocurrency Events

Tool to retrieve list of cryptocurrency events.

FRAMEWORKS

How to build Coinmarketcal MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Coinmarketcal MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Coinmarketcal MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Coinmarketcal MCP with Claude Code

Codex logo

Codex

Use Coinmarketcal MCP with Codex

OpenClaw logo

OpenClaw

Use Coinmarketcal MCP with OpenClaw

Hermes logo

Hermes

Use Coinmarketcal MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Coinmarketcal MCP with Atomic Agent

Google ADK logo

Google ADK

Use Coinmarketcal MCP with Google ADK

LangChain logo

LangChain

Use Coinmarketcal MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Coinmarketcal MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Coinmarketcal MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Coinmarketcal MCP with LlamaIndex

CrewAI logo

CrewAI

Use Coinmarketcal MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Coinmarketcal MCP with Pydantic AI

AutoGen logo

AutoGen

Use Coinmarketcal MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Coinmarketcal MCP server, the agents and LLMs can only access a fixed set of Coinmarketcal tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Coinmarketcal and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Coinmarketcal tools.

Yes, absolutely. You can configure which Coinmarketcal scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Coinmarketcal data and credentials are handled as safely as possible.

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