Massive
U.S. stock and options data, plus indices, FX and futures
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About
Massive, called Polygon.io until October 2025, covers trading on all U.S. stock exchanges, dark pools and OTC markets since 2003, and options chains with Greeks and implied volatility since 2014. Indices, currency and crypto pairs, futures from CME, CBOT, NYMEX and COMEX, and company financials are sold as well, with Benzinga news and analyst ratings as a paid add-on.
Reach for it when a question turns on how a U.S. stock or its options actually traded. Each asset class is its own subscription, and a request outside yours is refused.
The free Stocks Basic plan gives end-of-day data, two years of history and five calls a minute. Starter, at $29 a month, lifts the call limit on 15-minute delayed data; real-time data and 20+ years of history need Stocks Advanced at $199, which is sold to non-professionals only. Click Add and sign in when Massive's window opens. There is no API key to find.
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Frequently asked questions
- What is a Connector?
- A Connector is a remote MCP server that a third party runs and Marvin Labs knows how to reach. Marvin Labs supplies the endpoint and the setup; you bring your own Massive account. Once added, AI Analyst Chat and Deep Research Agents call its tools when a question needs them, and the answer shows which tool was called and what it returned.
- Does the Massive Connector require authentication?
- Yes. Adding Massive opens its sign-in window, where you approve access with your own Massive account. Marvin Labs never sees your password; Massive issues a token you can revoke on its side at any time.
- Does Massive change how financial data is sourced?
- No. When a question can be answered from the filings, earnings calls, and press releases Marvin Labs ingests through Automated Data Import, it answers from those. Massive is used only when a question needs data those documents do not carry, and the answer attributes that output to it.
- Where is Massive available?
- In both AI Analyst Chat and Deep Research Agents. Its tools stay out of the model's context until a request needs one, so an unused Connector takes up no context window.