I've been a customer for 10 years, awesome service. They had two factor auth back in the day, a card with a simple cipher. Specifically for options trading, th

I've been a customer for 10 years, awesome service. They had two factor auth back in the day, a card with a simple cipher. Specifically for options trading, they have incredibly low commissions, and instant execution. I was always impressed by their SDK and tools they exposed. I used the Java toolkit, I never made anything substantial in it though. They are extremely security focused as well.