I paid 1000 dollar commission each day to ib. If there is commission free api broker, saving 1000 $ daily is not bad. Alpache is too young maybe not mature. Any other choices?
Check out Tradier. Free stock trading, $30/mo flat rate option trading. SEC/TAF/etc apply. Cleared through Apex, so some payment for order flow vs IBKR Pro.
Robinhood may have an unofficial API: https://github.com/sanko/Robinhood Of course, they might shut it down at any moment (or might have already).
If you are doing 1k worth of commissions on IB and move it to Robinhood they may take notice and will ask you to stop or get banned.
For stocks, TDameritrade should be free with API. However, I have not used it so I cannot comment on price improvement or API functionalities. But if you decide to try, please let us know your experience. I am very curious about how much price improvement is there comparing to IB.