Quantopian, a platform where freelance quantitative analysts develop, test, and use trading algorithms to buy and sell securities has played a key role, and its community has nearly doubled year-over-year for the last four years. Quantopian’s community of more than 225,000 has run more than 9 million backtests on algorithmic trading strategies. Quantopian also builds and maintains Zipline, and Alpaca has built an integration to allow the Quantopian community to easily run algorithms with Alpaca’s commission free trading API.

https://www.businesswire.com/news/home/20181023005433/en/Fintech-Startup-Alpaca-Unveils-World%E2%80%99s-Commission-Free