Personal Investment Brokerages with API support

Trying to shift some of my portfolio to more active trading. Not trying to day trade but more medium frequency kind of stuff.

I want to automate lots of the trade executions so I'm looking for a brokerage with a hopefully free API (3rd party is okay) that's easy to use. 

2 that I know are - Interactive Brokers & Robinhood

Interactive Brokers seems to have a very good API but I'm not sure how much I'll be paying? I'm only managing below 100k so not sure if it'd be worth it.

Robinhood has a 3rd party API but trying to stay far away from that mess. But I don't need microsecond level latency so maybe it's worth a shot?

More suggestions are welcome. Thanks

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