Pay one subscription, visit sites. If those sites have a specific meta tag, add-on detects it, providing you with access to paywalled articles. The longer the site keeps my attention, the more of my subscription they get. They don't have to know a single thing about me other than "I'm using this service and I have a running subscription". Service aggregates those micropayments from their subscribers within a time frame and avoids transferring small transactions and fees associated to the website.