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athenara:~$ registry inspect architectures/lean

● lean — external

LEAN

QuantConnect's open-source event-driven algorithmic trading engine, supporting strategies written in Python or C# across nine asset classes.

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#algorithmic-trading #backtesting #event-driven #multi-asset #engine

added 2026-08-15 · Apache-2.0 · external

$ git clone https://github.com/QuantConnect/Lean

LEAN is an event-driven engine that runs the same algorithm code in backtesting, paper trading, and live deployment. It supports equities, forex, options, futures, future options, indexes, index options, cryptocurrency, and CFDs from a single portfolio, and integrates with roughly 40 price, fundamental, and alternative data sources plus user-supplied custom datasets.

The engine is the core of the QuantConnect platform but is usable standalone. Written primarily in C# with a Python API; in continuous development since 2014.

trading [●●●●·] advanced   ai [●····] none   programming [●●●●·] advanced   setup [●●●··] moderate

authors QuantConnect
origin external
license Apache-2.0
markets multi-asset

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