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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.

Additional Topics

• Two authentication options available for Alpaca API connectors discussed on this page.
• 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 requests: low-level and high-level described on this page.
• Time intervals handling for REST API requests discussed on this page.
• Fractional shares trading support discussed on this page.

Extensions Package

The Alpaca.Markets.Extensions NuGet package contains the set of helper extension methods and interfaces for implementing some application- or scenario-specific tasks:

• The IAsyncEnumerable<T> and IAsyncDisposable interfaces support for the IAlpacaDataSubscription<T> class this page.
• The IAsyncEnumerable<T> interface support for the Alpaca Data API v2 pagination discussed on this page.* The new IHttpClient interface and strongly-typed clients usage in modern apps discussed on this page.
• The streaming client auto-reconnection support discussed on this page.
• The Alpaca Proxy Agent support discussed on this page.