Massive

Meet Massive

Massive, formerly Polygon.io, supplies financial market data for developers, analysts, and businesses building investment tools. Its datasets cover stocks, options, indices, currencies, and other markets, with access to trades, quotes, price aggregates, and reference information. Teams can request data through REST APIs, subscribe to streaming updates over WebSockets, or download historical datasets as flat files.

The platform provides client libraries, documentation, and examples for working with data in common programming languages. A developer can use it to populate a chart, build a market dashboard, research historical prices, or support a trading application. Available datasets, historical coverage, update frequency, and permitted uses depend on the selected plan and applicable data entitlements.