# Massive (Polygon.io) (MCP Server)

> Stock, options, forex and crypto market data from Massive, formerly Polygon.io

- Type: MCP server
- Publisher: Massive (official)
- Categories: Finance, Data & Analytics
- Website: https://github.com/massive-com/mcp_massive
- Source: https://github.com/massive-com/mcp_massive
- Transport: stdio
- Launch command: mcp_massive
- Sign-in: api-key
- Environment variables: MASSIVE_API_KEY
- GitHub stars: 397
- Listed: 2025-03-19

## About

Massive's official MCP server (the company formerly known as Polygon.io) gives agents access to its financial market data APIs, including stocks, options, forex and crypto, by searching endpoints, calling the API and querying results. It runs locally after a one-time uv tool install and authenticates with MASSIVE_API_KEY.

## Install

1. **Add the server to Codex**

   Codex CLI:

   ```bash
   codex mcp add massive --env MASSIVE_API_KEY=YOUR_MASSIVE_API_KEY -- mcp_massive
   ```

   config.toml:

   ```toml
   [mcp_servers.massive]
   command = "mcp_massive"
   
   [mcp_servers.massive.env]
   MASSIVE_API_KEY = "YOUR_MASSIVE_API_KEY"
   ```

   Agents SDK:

   ```python
   from agents import Agent, Runner
   from agents.mcp import MCPServerStdio
   
   async with MCPServerStdio(
       name="Massive (Polygon.io)",
       params={"command": "mcp_massive", "args": []},
   ) as server:
       agent = Agent(name="Assistant", mcp_servers=[server])
       result = await Runner.run(agent, "What was AAPL's closing price for each day last week?")
       print(result.final_output)
   ```

## Tools

- `search_endpoints`
- `call_api`
- `query_data`

## Example prompts

- "What was AAPL's closing price for each day last week?"
- "Show the options chain for TSLA expiring next Friday"
- "Get the latest EUR/USD quote"
- "Compare NVDA and AMD daily volume over the past month"

## Also available as

- app: [Massive](https://chatgptplugins.directory/apps/massive.md)

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Source: https://chatgptplugins.directory/mcp/massive · Index: https://chatgptplugins.directory/llms.txt · Independent and community-run. Not affiliated with or endorsed by OpenAI. ChatGPT is a trademark of OpenAI.