To highlight how Square Cash can be used to pay for anything, anywhere, without cash, the Square Cash Mystery Cube vending machine dispenses random prizes when users email it. The Mystery Cube prompts passers by to send it an email from their mobile phone. On the cube will be written "Email me your name for
fast prizes."

Each cube will look mysterious and out of place, so passers by are intrigued by this new addition to their world. As there will be numerous Mystery Cubes, each cube has a unique email address, such asmysterycube@highstreet.com. Once the email has been sent, the Mystery Cube will instantly dispense a random prize, ranging from chewing gum to jewellery and music players.
People who email the Square Cash Mystery Cube will also receive a reply email from Square Cash, which states "Congratulations for emailing the Square Cash Mystery Cube - now every transaction can be as easy as sending an email," and provide information on how to start a Square Cash account.