I don't know if I understand you correctly, but you can log-in to your CPA affiliate network website, and line up usable campaigns via EPC (Earnings Per Click) - and you will see most converting offers at the moment.
I am doing (cost per action) through a niche (free internet marketing course) using free trailbux points. at cpaprofits.org. It is a forwarded domain of course. so I guess you can say my CPA network is the fortune 500 companies and intermediaries providing these ads (trial offers for points). I get other people to take trial offers... and sign up... and I receive cash, 50-150 dollars per sign-up. does this make sense now?