API documentation

Polygon Docs

Polygon.io provides instant, scalable access to data on U.S. stocks, options, futures, indices, forex, and crypto for both personal and business applications. Our developer-focused APIs efficiently support financial applications of all complexities.

Explore access methods
Query, stream, or sync

Access methods

Begin by selecting the access method that best suits your goals.

REST API Docs
Start your journey here. The REST API allows you to request specific market data and analytics on demand. It's perfect for fetching historical records, running ad-hoc queries, or integrating market data into your applications as needed.
WebSocket API Docs
Upgrade to real-time data streaming. When your application requires live updates—such as for trading platforms, real-time analytics, or monitoring tools—the Websocket API provides a continuous stream of market data.

Need bulk historical data?

Easily sync large datasets for backtesting, research, and analytics with our full historical archives of daily flat files.

Explore flat files →
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