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We introduce virtual prepaid tokens (VPT), a novel billing scheme that allows users to obtain access at Wi-Fi hotspots without having an account with a hotspot provider or a physical prepaid token (PPT). Upon arrival at a hotspot, a user buys a VPT online, using a third-party payment server with which the user already has an account. Experiments show that users can buy a VPT and gain full Internet connectivity in less than 15 seconds, i.e. much less time than it would take to create another account or to buy and activate a PPT. VPT can be used in hotspots that use a captive portal or IEEE 802.1x for user authentication. The latter alternative enables better security. We also contribute a novel technique that allows a single access point to authenticate users by either method. Hotspots can use this solution for migrating to 802.1x without disrupting legacy captive-portal users. Experiments demonstrate that the proposed …