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Interactive Brokers is a professional brokerage that has a free tier now and just added fractional shares as well.

Vanguard, Fidelity, Schwab, TD Ameritrade are all legitimate operations as well, but IB is what professionals use.

Yes, IB is what I use too. Their paid individual account tier is only $10 a month and provides SDK's with robust support for Python, Java, and C++.

Does their paid tier include free options trading? That’s what’s attractive about Robinhood, but they cost me $7k on Monday so I’m dumping them.

Only US Exchange-Listed Stocks / ETFs are commission free.[1] Honestly though, the commissions are extremely low. Definitely lower than that $7k. Just keep in mind, you get what you pay for.

[1] https://www.interactivebrokers.com/en/index.php?f=45500

Their fees are something like 10 cents if you’re trading an option. Completely irrelevant.

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