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How to connect Marketstack to Claude

Connect Claude Web, Desktop and Cowork to Marketstack MCP. Get the latest price for aapl, show historical prices for tsla last month, and more using natural language, with authentication handled for you.

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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

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 Marketstack account to Claude 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.

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 Marketstack with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Marketstack 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 Marketstack account

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

For example, ask Claude 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 Claude, and your Marketstack account is ready to use.

What is the Marketstack Claude Connector, 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.

Troubleshooting

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

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

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

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

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

  • 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 Marketstack.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Marketstack authorization link not work?

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

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

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

The Marketstack connection can expire or lose permission.

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

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

Claude can manage the Marketstack connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Marketstack 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 Marketstack.
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

Claude Code logo

Claude Code

Use Marketstack MCP with Claude Code

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

Codex logo

Codex

Use Marketstack MCP with Codex

OpenClaw logo

OpenClaw

Use Marketstack MCP with OpenClaw

Hermes logo

Hermes

Use Marketstack MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Marketstack MCP with Atomic Agent

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

Pydantic AI logo

Pydantic AI

Use Marketstack MCP with Pydantic AI

AutoGen logo

AutoGen

Use Marketstack MCP with AutoGen

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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