When you surf our traffic exchanges, you earn credits. Credits are like points that are used to get hits, or page views, to your websites. Typically, for every 1 credit you earn, you will get 1 view of your website. At TrafficRoundup.com you have to manually assign credits to your URLs. At FunnyFarmTraffic.com they are automatically added. At MuscleMailSafelist.com they are only used when you place an ad and someone views the ad.
They can also be traded for banner impressions at TrafficRoundup.com and FunnyFarmTraffic.com