ssi.developer SSIDeveloper.FastConnect.Sdk by: ssi.developer .NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 490 total downloads last updated 8/27/2026 Latest version: 3.2.1 ssi fastconnect trading stock market-data websocket SSI FastConnect SDK for .NET — REST API and WebSocket streaming for stock trading, market data, and portfolio management.