Mobile agent technology is a promising paradigm for a myriad of real world applications. Owing to their tremendous capabilities, multiagent systems have been scoped in a large number of applications. However issues related to fault tolerance can hamper the suitability of mobile agents in these real world systems. In this paper we have proposed an infrastructure which provides agent fault tolerance. An algorithm similar to the sliding window model ensures a fault tolerant behavior. Different types of agents, work in collaboration to provide the desired system behavior by tolerating faults. The proposed infrastructure will be applicable in a variety of systems including, ecommerce, online banking etc. With the increasing market of electronic commerce it becomes an interesting aspect to use autonomous mobile agents for electronic business transactions.