MotivationMany services online would be more accessible if they could simultaneously provide revenue for their creators, and make the payment process for the user as frictionless as possible. Traditional services, such as newsletters like The New York Times, diminish their readability by requiring an upfront cost (in both money and effort) via the much-hated paywall:It's only $1/week... until you forget to cancel 1 year from now!This problem is going to grow with time, as API-based promp...