nautechsystems/nautilus_trader

Exposes a unified Python API while core logic runs in high-performance Rust via PyO3 bindings, enabling strategies written in Python to achieve research-to-production parity without code changes. Supports multi-asset backtesting with nanosecond-resolution tick data, advanced order types (IOC, FOK, GTC, GTD, OCO, OTO), and contingency orders across multiple venues simultaneously. Integrates with crypto exchanges (CEX/DEX), traditional markets (FX, equities, futures, options), and betting exchanges through modular REST/WebSocket adapters.

21,112 stars and 88,577 monthly downloads. Actively maintained with 386 commits in the last 30 days. Available on PyPI.