SAVE THIS: 4 free engines to test a crypto strategy before it touches real money.
1. NautilusTrader
Rust-native engine. The same code runs your backtest and your live bot. Supports Binance, Bybit, OKX, Hyperliquid, dYdX and Polymarket.
2. Hummingbot
Market-making and algo bots across CEXs and DEXs. Paper trades on live Binance data with no API keys.
3. Jesse
Python crypto framework for backtesting, paper and live. Ships a local MCP server so Claude can work inside your strategies.
4. vectorbt
Tests thousands of strategy variations in seconds. Free to use, but its Commons Clause license bars selling it.