In the actual context of developing digital services, the promotion of a system that manages multiple e-commerce sites can be extremely valuable in increasing the economic effects for the companies. This paper presents the current stage of the experimental system design and implementation, an open system website-based (called Single Way for E-Commerce - SWEC) having the goal to collaborate with many database servers of the companies that offer e-commerce sevices and also to interract with electronic payment and e-administration systems. This new approach allows the clients, after them authentication, to navigate on e-commerce websites and search different products, grouping on domains, companies and geographic areas. SWEC System will offer to the customer the opportunity to visualize and compare similar products, to order and receive a single invoice for all the products he wants to buy.