fastlob is an open-source, minimalist limit-order-book implementation in pure Python, designed for developers building trading and finance applications. It offers fast execution and a simple interface for integrating order book logic into custom systems.
In the Other dev tools space, fastlob takes a focused approach. It focuses on implementing a performant and simple limit-order-book for trading systems without external dependencies. fastlob is an open-source project aimed at developers building trading or finance applications. The project is open source (MIT). The product ships for the web and the command line, and it can be self-hosted.
Behind fastlob is mrochk, and the product first shipped in 2025. The project is developed in the open on GitHub with 11 stars and 1 commits in the last 90 days. Across PulseGate's embedding index, fastlob has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are limit order book, fast execution, and minimalist design.
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