I have a great AI trading strategy that operates on order book. It showed great potential, but it is a high frequency (30 sec. to 5 mins trades) and only takes small profits. So it mostly fails due to high commissions. I'm looking for a broker or an exchange of ANY MARKET that: 1) Has zero commissions or a flat monthly fee. 2) Is very liquid 3) Has order book feed 4) Has API 5) Good execution of my market orders Thanks for any feedback!