TrueData Velocity provides six distinct pricing programs plus the pricing depends upon several symbols, exchanges, and so forth. It's because IB feed wasn't intended as tick-by-tick and never intended to produce time&product sales sequence, but fairly exclusively to update TWS Screen grid. Also, marginally delayed data is accessible for https://amibrokerdata21874.wizzardsblog.com/29001528/5-simple-statements-about-data-feed-for-amibroker-explained