I don't trade futures intraday, but it appears that exchange minimums only apply to positions held overnight. If a position is closed the same day it is opened, the margin requirement, if any, is set by the broker. This is for retail trading. Proprietary trading has its own rules.
dollars made = 5 x 13 x 50 margin required = 5 x 5000 you don't use 500/contract day trading margin to make 13 pts, cause the risk (stop) needed for a non-scalp trade would exceed any meaningful ratio for anything less than the overnight min of 5k.