Square Cash: send money by email. This is from the people who make the iPhone dongle you often see at food trucks to process card swipes, so they have some legitimacy.
Download the app, select an amount to send or request, type the recipient's email address. If this is the first time using the app, it will prompt you for a debit card number. Done.
Simple idea, great execution. Highly recommended if you need to reimburse friends or employees for small expenses.
https://square.com/cash
