In SwapTree, there are no credits. All trades are person-to-person. You list on the site what you want to trade out and what you want to get, and whenever there's a match, the system will enable you to do a direct one-to-one trade with a person who has something you want and wants something you have. SwapTree will also enable three- and four-way trades, coordinating the shipment of multiple items between its members so everybody unloads what they don't want and gets what they do, even if there's no pair of users with precisely correlating wishes.
SwapTree, a new way to get value from old books and CDs | News.blog | CNET News.com