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
  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
deployment:
  mode: remote
  endpoint: https://mcp.massive.com
  verified: probed
  probe: gated
  checked: '2026-08-12'
  source: catalog MCP census