Clinkle was supposed to be an app that used sound waves to make purchases from your phone. Now, it's some sort of vague (and vaguely sad) debit card—and based on this leaked email, the startup has to bribe people to use it.

Lucas Duplan, age 22, just banked $25 million for an app no one really knows much about. Well, a few do: his investors, and a tipster who leaked us some very interesting details about the clandestine wallet app. Does the world need a new way for Yale kids to buy things?