Trafficstars is a great place for contextual traffic. The creative moderation process isn't too long and the stats are detailed and concise, no need to allocate funds for a tracker. I'm consitently in the black with these guys and that's nice. The only thing missing is a referral program but I think the guys will add it soon
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TrafficStars is a self-serve ad network & RTB platform connecting advertisers and publishers worldwide. We offer 7 profitable ad formats, media-buying tools, Optimizer, and work by CPA/CPC/CPM pricing models. We serve 5+ billion ad impressions daily, offering premium traffic sources.