One of the problems an intermediary faces is deciding what kind of exchange service it should offer to its customers and suppliers. Developing the right exchange design is a complex undertaking because of the many design options on the one hand and the interests of multiple actors to be considered on the other. This is far more difficult than simple prescriptions like ‘creating a win-win situation’ suggest. Authors address this problem by developing design patterns for the exchanges between customers, intermediary, and suppliers related to role, linkage, transparency, and novelty choices. For developing these design patterns, they studied four distinct electronic intermediaries and identified exchange design choices that require trade-offs relating to the interests of customers, intermediary, and suppliers. The exchange design patterns contribute to the development of design theory for electronic intermediaries by filling a gap between basic business models and detailed business process designs.