Looking to start a free online service where users use credits. I see several ways of providing users with credits. 1. User clicks on ads or views ads to get credit In which case does anyone know of any existing services which I could integrate to allow users to see ads or click ads/banners in exchange for giving the users credits ? 2. Trial pay like services which when you buy something means they get credits. Also apart from standard method of users depositing real cash for credits are there any other methods that I can use to provide users with free cash in exchange for doing or viewing something ?. Thanks
1) I've seen it tried before, but I don't know if any are still around. You may have to check on google or someone else can chime in. 2) I know some game apps on facebook give you credits if you buy something from a sponsor.