Systems/methods for sending offers to a user viewing a web page. A third-party offer engine proxy server is interposed between the user computing device and a destination web server to which the user is browsing. The offer engine proxy receives a first message comprising browsing information from the user computing device and sends the first message to the destination web server. The offer engine proxy receives a resulting web page from the destination web server. The offer engine proxy determines at least one topic of the browsing information. The offer engine proxy determines an offer to be sent to the user based on the at least one browsing information topic. The offer engine proxy modifies the resulting web page to include an offer to be sent to the user. The offer engine proxy sends a second message including the modified webpage and the offer to the user computing device.