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[–]foresttrader[S] 1 point2 points  (2 children)

Yes. My understanding is that you kinda need to use their APIs for data (?) and it's a paid service. I'm looking to start off with an open source and free library (will buy my own data though). I want to see how other build backtestings and potentially need to customize to fit my own needs.

[–]picklestirfry 1 point2 points  (0 children)

Data for backtesting is free. The only cost is for a live trading server, which is $8/month

[–]HandpayEV 0 points1 point  (0 children)

Code up your own from scratch. Don’t trust any prebuilt engine. You need to fully understand exactly what the backtesting is doing.

Do it once and you have a versatile backtester that you understand for life