IQFeed.CSharpApiClient is fastest and the most well-designed C# DTN IQFeed socket API connector available
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Market Data GitHub Repositories (2026) · Open Source Tools
Discover the best Market Data open source repositories on GitHub. Explore trending tools, live star counts, source code, and developer projects updated daily.
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26 matching projects · updated Nov 12, 2026
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C#/.NET client library for the Kucoin.com cryptocurrency exchange REST and WebSocket APIs, supporting Spot and Futures trading and market data with strongly typed models.
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C#/.NET client library for the Kraken.com cryptocurrency exchange REST and WebSocket APIs, supporting Spot and Futures trading and market data with strongly typed models.
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One open-source API for prediction markets. Trade Kalshi, Polymarket, Polymarket US and Opinion with one Python SDK: unified market data, smart order routing across venues, and advanced order types. Plus tick-level Kalshi order book history.
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VisualHFT Terminal: open-source observability and decision terminal for electronic trading desks. Live Level 2 order books, microstructure analytics, and quantitative execution monitoring.
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QuestDB is a high performance, open-source, time-series database
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