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Polygon.io MCP Server

@polygon-io

Repository

About Polygon.io MCP Server

An MCP server for Massive.com Financial Market Data

#options#mcp#cryptocurrency#fintech#market-data#stocks#llm#mcp-server

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mcp_polygon": {
      "command": "uv",
      "args": [
        "tool",
        "install",
        "mcp_massive @ git+https://github.com/massive-com/[email protected]"
      ]
    }
  }
}

Tools

3

Search for API endpoints and built-in functions by natural language query. Returns titles, path patterns, and descriptions. Set `detail` to `"more"` for query parameter docs, or `"verbose"` for full documentation. Use `max_results` to limit results.

Call any Massive.com REST API endpoint. Supports storing results as an in-memory database table (`store_as`) and applying post-processing functions (`apply`). Paginated responses include a next-page hint.

Run SQL against stored SQLite DB. Supports `SHOW TABLES`, `DESCRIBE <table>`, `DROP TABLE <table>`, CTEs, window functions, and more. Results can also be post-processed with `apply`.

Overview

What is Massive.com MCP Server?

The Massive.com MCP Server gives LLMs access to the full Massive.com financial data API through three composable tools: search, call, and query. Data can be stored in an in-memory SQLite database and enriched with built-in financial functions. It is for developers who want to integrate market data into AI assistants.

How to use Massive.com MCP Server?

Install with uv tool install "mcp_massive @ git+https://github.com/massive-com/[email protected]" and set the MASSIVE_API_KEY environment variable. Then register the server with Claude Code (claude mcp add massive...) or add it to your Claude Desktop configuration. The LLM uses three tools: search_endpoints to discover endpoints and functions, call_api to fetch data, and query_data to run SQL against stored results.

Key features of Massive.com MCP Server

  • Three tools cover the entire Massive.com API surface.
  • Built-in financial functions for Greeks, returns, and technicals.
  • Dynamic endpoint indexing via llms.txt stays current automatically.
  • In-memory SQLite database for storing and querying results.
  • Multiple transport options: stdio, SSE, and streamable-http.

Use cases of Massive.com MCP Server

  • Fetch real-time stock, option, forex, crypto, and futures aggregates.
  • Compute Black-Scholes option Greeks and moving averages.
  • Analyze historical trades, quotes, and market snapshots.
  • Retrieve financial fundamentals, dividends, splits, and analyst ratings.

FAQ from Massive.com MCP Server

What data does the server cover?

Stock, options, forex, crypto, and futures aggregates; real-time and historical trades and quotes; market snapshots, gainers/losers; ticker details; dividends, splits, IPOs; financial fundamentals; analyst ratings and news; treasury yields, inflation data; market status and holidays.

What are the prerequisites?

Python 3.12+, a Massive.com API key, and Astral UV v0.4.0+.

What environment variables are required?

MASSIVE_API_KEY is required. Optional: MCP_TRANSPORT (default stdio), MASSIVE_API_BASE_URL, MASSIVE_LLMS_TXT_URL, MASSIVE_MAX_TABLES (default 50), MASSIVE_MAX_ROWS (default 50000).

How does the server handle my API key?

The API key is used only for authenticating requests to Massive.com. No personal data is stored or cached; all requests are proxied directly.

What transport protocols are supported?

STDIO by default. SSE and streamable-http are also supported via the --transport CLI argument or MCP_TRANSPORT environment variable.

Frequently asked questions

What data does the server cover?

Stock, options, forex, crypto, and futures aggregates; real-time and historical trades and quotes; market snapshots, gainers/losers; ticker details; dividends, splits, IPOs; financial fundamentals; analyst ratings and news; treasury yields, inflation data; market status and holidays.

What are the prerequisites?

Python 3.12+, a Massive.com API key, and Astral UV v0.4.0+.

What environment variables are required?

`MASSIVE_API_KEY` is required. Optional: `MCP_TRANSPORT` (default `stdio`), `MASSIVE_API_BASE_URL`, `MASSIVE_LLMS_TXT_URL`, `MASSIVE_MAX_TABLES` (default 50), `MASSIVE_MAX_ROWS` (default 50000).

How does the server handle my API key?

The API key is used only for authenticating requests to Massive.com. No personal data is stored or cached; all requests are proxied directly.

What transport protocols are supported?

STDIO by default. SSE and streamable-http are also supported via the `--transport` CLI argument or `MCP_TRANSPORT` environment variable.

Comments

Basic information

Category

Finance & Commerce

License

MIT

Transports

stdio

Author

polygon-io

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