Fresh from their much-lauded sale of alternative student-financing company Paytronage, Connor Swofford W16 and Zach Pelka W17 have again set their sights on transforming the way we pay. With B2B cryptomining startup Mineful, they’re helping “freemium” desktop app publishers monetize free-tier users. In lieu of credit cards, app users can unlock paid services and content by sharing their idle computing power, which Mineful plugs into its distributed cryptomining operation. Participating app publishers integrate Mineful with a simple API and receive a cut of the cryptomining profits in USD—profits that were generated with app users’ power. The company, which counts fintech entrepreneur Michael Taormina WG15 among its mentors, has set an ambitious goal: to become as ubiquitous as PayPal.