New and existing clients will be able to select between using IBKR Lite and IBKR Pro and switch between the two levels of service up to three times and then once per quarter. Like many other brokers, Interactive Brokers will route the orders of IBKR Lite clients to market makers in exchange for receiving payment for order flow. Clients that opt to use IBKR Pro will continue to receive the best prices our sophisticated algorithms can secure for them.