Abstract: A system is provided for selectively implementing an electronic transaction based on proximity detection of a user device. The electronic transaction includes primary parameters in the form of the user device being within a distance of a location by a predefined time, and secondary parameters in the form of a bid amount and a bid recipient. The system includes a central server and the user device having a UI configured to receive secondary parameters and being in communication with the central server. The user device further includes a location module for selective location tracking of the user device by the central server. Primary and secondary parameters are transmitted to the central server and the central server conditionally pre-authorizes the electronic transaction such that if the primary parameters are not met, the electronic transaction is implemented based on the secondary parameters.