How to connect Marketstack to Claude Cowork

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks. This guide walks you through the easiest and most secure way to connect your Marketstack account to Cowork via Composio Connect, enabling it to get the latest price for AAPL, show historical prices for TSLA last month, list top gainers on NYSE today, and more such actions on your behalf without compromising your account security.

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Marketstack is a financial data API offering real-time, intraday, and historical stock data for 125,000+ tickers across 72+ global exchanges. Instantly access accurate market insights for trading, analytics, and research.

10 Tools

Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Marketstack account to Cowork via Composio Connect, enabling it to get the latest price for AAPL, show historical prices for TSLA last month, list top gainers on NYSE today, and more such actions on your behalf without compromising your account security.

Also integrate Marketstack with

OpenAI Agents SDKClaude Agent SDKClaude CodeCodexOpenClawHermesCLIGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAI

Connecting Marketstack to Claude Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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 Cowork

4. Connect your Marketstack account

Back in Cowork, ask the agent to connect to Marketstack or give it any Marketstack-related task.

For example, ask Cowork to:

  • "Get the latest price for AAPL."
  • "Show historical prices for TSLA last month."
  • "List top gainers on NYSE today."

It will prompt you to authenticate and authorize access.

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

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Marketstack through MCP without you sharing account credentials directly with the agent.

What is the Marketstack MCP server, and what's possible with it?

The Marketstack MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Marketstack account. It provides structured and secure access so your agent can perform Marketstack operations on your behalf.

TOOLS

Supported Tools

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

Get Dividends

Tool to retrieve stock dividend data for one or more ticker symbols from Marketstack API.

Get End-of-Day Data

Tool to retrieve end-of-day (EOD) stock data for one or multiple ticker symbols.

Get Exchange Info

Tool to retrieve detailed information for a specific stock exchange by its MIC (Market Identifier Code).

Get Stock Splits

Tool to retrieve stock split data for one or more stock symbols from Marketstack.

Get Ticker EOD Data

Tool to retrieve end-of-day stock price data for a specific ticker symbol.

Get Ticker EOD Latest

Tool to retrieve end-of-day (EOD) stock data for the latest available date for a specific ticker.

Get Ticker Info

Tool to retrieve detailed information about stock tickers including exchange, sector, and industry data.

List Currencies

Tool to retrieve a list of all supported currencies from the Marketstack API.

List Stock Exchanges

Tool to retrieve information about supported stock exchanges.

List Tickers

Tool to get a list of all supported stock tickers.

FRAMEWORKS

How to build Marketstack MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Marketstack MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Marketstack MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Marketstack MCP with Claude Code

Codex logo

Codex

Use Marketstack MCP with Codex

OpenClaw logo

OpenClaw

Use Marketstack MCP with OpenClaw

Hermes logo

Hermes

Use Marketstack MCP with Hermes

CLI logo

CLI

Use Marketstack MCP with CLI

Google ADK logo

Google ADK

Use Marketstack MCP with Google ADK

LangChain logo

LangChain

Use Marketstack MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Marketstack MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Marketstack MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Marketstack MCP with LlamaIndex

CrewAI logo

CrewAI

Use Marketstack MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Marketstack MCP server, the agents and LLMs can only access a fixed set of Marketstack tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Marketstack 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 Marketstack tools.

Yes, absolutely. You can configure which Marketstack 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 Marketstack data and credentials are handled as safely as possible.

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A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

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