generated: '2026-07-22'
method: searched
status: published
source: https://github.com/polygon-io/mcp_polygon (redirects to https://github.com/massive-com/mcp_massive)
notes: >-
  Massive (formerly Polygon.io) ships an official open-source MCP server (massive-com/mcp_massive,
  v0.10.0, Python/FastMCP) plus a hosted remote MCP server launched 2026-07-02 (see changelog).
  Rather than one tool per endpoint, the server exposes three composable tools that cover the
  entire REST surface: the tool index is built dynamically at startup from
  https://massive.com/docs/rest/llms.txt, so it stays in sync with the API. The remote server at
  https://mcp.massive.com is OAuth-gated (Bearer; authorization server https://auth.massive.com),
  so live tools/list introspection requires an authenticated session; the tool list below comes
  from the published README.
servers:
  - name: massive (remote)
    transport: streamable-http
    url: https://mcp.massive.com
    auth: oauth2 (Bearer; resource metadata at /.well-known/oauth-protected-resource, authorization server https://auth.massive.com)
    gated: true
  - name: massive (local)
    transport: stdio        # also sse and streamable-http via MCP_TRANSPORT
    repository: https://github.com/massive-com/mcp_massive
    version: v0.10.0
    install: uv tool install "mcp_massive @ git+https://github.com/massive-com/mcp_massive@v0.10.0"
    register: claude mcp add massive -e MASSIVE_API_KEY=your_api_key_here -- mcp_massive
    environment:
      - name: MASSIVE_API_KEY
        required: true
        description: Massive.com API key (POLYGON_API_KEY is a deprecated alias)
      - name: MCP_TRANSPORT
        required: false
        default: stdio
        description: stdio | sse | streamable-http
      - name: MASSIVE_API_BASE_URL
        required: false
        default: https://api.massive.com
      - name: MASSIVE_LLMS_TXT_URL
        required: false
        default: https://massive.com/docs/rest/llms.txt
        description: URL for the endpoint index the server builds its tool surface from
      - name: MASSIVE_MAX_TABLES
        required: false
        default: '50'
      - name: MASSIVE_MAX_ROWS
        required: false
        default: '50000'
tools:
  - name: search_endpoints
    description: >-
      Search for API endpoints and built-in functions by natural language query. Returns titles,
      path patterns, and descriptions. detail can be "more" (query parameter docs) or "verbose"
      (full documentation); max_results limits results; scope="functions" discovers built-in
      analytics functions.
  - name: call_api
    description: >-
      Call any Massive.com REST API endpoint. Supports storing results as an in-memory SQLite
      table (store_as) and applying post-processing functions (apply). Paginated responses
      include a next-page hint.
  - name: query_data
    description: >-
      Run SQL against the in-memory SQLite database of stored results. Supports SHOW TABLES,
      DESCRIBE, DROP TABLE, CTEs, window functions; results can be post-processed with apply.
functions:
  greeks: [bs_price, bs_delta, bs_gamma, bs_theta, bs_vega, bs_rho]
  returns: [simple_return, log_return, cumulative_return, sharpe_ratio, sortino_ratio]
  technical: [sma, ema]