With mobile devices and wireless hotspots becoming more prevalent, customers can desire greater access to media and services that can be achieved from the marrying of these two technologies. However, often existing devices need to be augmented with hardware and software to achieve this connectivity, and the existing services are heterogeneous and incompatible with one another. By leveraging the captive portal mechanism and proposed context-aware technologies, we propose a lightweight framework that can aggregate these services in smart spaces, and allow mobile users to spontaneously discover them without any specialized installation. In this paper, we present the system requirements for spontaneous interaction, the service framework design and implementation details.