[!IMPORTANT] :test_tube: This project is experimental and could be subject to breaking changes.

Massive.com MCP Server

A Model Context Protocol (MCP) server that provides access to the full Massive.com financial data API through an LLM-friendly interface.

Rather than exposing one tool per endpoint, this server gives the LLM three composable tools — search, call, and query — that cover the entire Massive.com API surface. Data can be stored in an in-memory SQLite database, and enriched with built-in financial functions.

[!TIP] Don't want to install anything? Massive hosts this server at https://mcp.massive.com. See the AI Tools quickstart for setup in each client.

Tools

Tool	Description
search_endpoints	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_api	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.
query_data	Run SQL against stored SQLite DB. Supports SHOW TABLES, DESCRIBE , DROP TABLE , CTEs, window functions, and more. Results can also be post-processed with apply.

Built-in Functions

Functions can be applied to API results or query output via the apply parameter on call_api and query_data. Use search_endpoints with scope="functions" to discover them.

Category	Functions
Greeks	bs_price, bs_delta, bs_gamma, bs_theta, bs_vega, bs_rho — Black-Scholes option pricing and greeks
Returns	simple_return, log_return, cumulative_return, sharpe_ratio, sortino_ratio
Technical	sma (simple moving average), ema (exponential moving average)

Data Coverage

The server dynamically indexes all Massive.com API endpoints at startup from llms.txt, so it automatically stays in sync with the API. Coverage includes:

• Stock, options, forex, crypto, and futures aggregates
• Real-time and historical trades and quotes
• Market snapshots, gainers/losers
• Ticker details and reference data
• Dividends, splits, IPOs
• Financial fundamentals
• Analyst ratings and news (Benzinga)
• Treasury yields, inflation data
• Market status and holidays

Installation

Prerequisites

• Python 3.12+
• A Massive.com API key [![Button]][Link]
• Astral UV (v0.4.0+)

Claude Code

First, install Claude Code

npm install -g @anthropic-ai/claude-code

Install the MCP server, then register it with Claude Code:

# Install the server (one-time — downloads dependencies ahead of time)
uv tool install "mcp_massive @ git+https://github.com/massive-com/mcp_massive@v0.10.0"

# Register with Claude Code
claude mcp add massive -e MASSIVE_API_KEY=your_api_key_here -- mcp_massive

To upgrade to a new version later: