Embodiments of methods and systems are provided that allow a user to upload inventories, view inventories in the proximity of the user, and/or facilitate transactions over a user device in a simple manner. In an embodiment, a method for transactions comprises loading, by a server at a remote location, an application on a user device of a user, wherein the application allows the user to upload an inventory comprising one or more items and/or services offered for sale by the user, as well as to view on the user device other inventory offered for sale by one or more other users as the user comes into proximity of the one or more other users, and wherein an inventory list maintained at the user device is constantly updated with the other inventory viewed by the user device. The method also comprises receiving, by the server at the remote location, transaction information associated with conducting a transaction in connection with the inventory list over the user device. The method further comprises facilitating, by the server at the remote location, the transaction between the user via the user device and the one or more other users.