“I have used a number of data feeds, including Hyperfeed. The NxCore API is by far the easiest to use and the NxCore data feed is by far the fastest, the most complete and the most robust. But best of all the entire NxCore data feed, including bbo options, is easily delivered over a 3mbps internet connection. NxCore requires nothing more than a cable modem and a modest P.C. to receive the entire US equitity and option market.”