@HieuDang don't use them. I goft 5-6 payments from them. Their rates are quite poor and so I reduced their ads and was making .65-1$ per day[8k impressions/day]. Just before my payments day they blocked my a/c and pocketed all earning. Reason given by them was not much traffic.
They got great popunders and that sucks. I am using right now and I see potential but if they do that to me then no recommend to anyone about using them. If they don't close my account then I will keep using them.