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The Alpaca.Markets NuGet package contains the .NET SDK that provides unified access for different API endpoints:

Alpaca Markets API Endpoints

These endpoints available for both paper and brokerage accounts:

• Alpaca Trading API - via the AlpacaTradingClient class.
• Alpaca Market Data API - via the AlpacaDataClient class.
• Alpaca Trading Data Streaming API - via the AlpacaStreamingClient class.
• Alpaca Market Data Streaming API - via the AlpacaDataStreamingClient class.

Polygon.io API Endpoints

These endpoints available only for users with brokerage accounts:

• Polygon Market Data API - via the PolygonDataClient class.
• Polygon Market Data Streaming API - via the PolygonStreamingClient class.

Additional Topics

• How to handle Paper and Live environments easily with the help of extension methods provided by SDK.
• Two main options for configuring new order placement request: low-level and high-level described on this page.
• Two authentication options available for Alpaca API connectors discussed on this page.