Over the last few years, Service Discovery Protocols (SDP) like SLP, Jini, UPnP and Bluetooth demand special interest on scientific community and industry since they promise a new engagement opportunity between services and clients. Despite the fact that these protocols were first concerned with connecting devices, they also play an important role on information services trading which is very relevant considering Internet’s large scale. This paper presents the design of JTrader, an Internet Trading Service based on Jini Technology whose main purpose is to address root problems around service trading on the Internet.