PayPal customers have US$13 billion on deposit with the payment company, which makes the deposit side of its business comparable with a mid-sized US bank, the Wall Street Journal reports. The funds are not actually deposits, as PayPal is not a bank, but cash that has been loaded by consumers ahead of their purchases. As PayPal and other payment companies offer increasingly bank-like services, regulators are taking an interest. The US Federal Deposit Insurance Corp and the Office of the Comptroller of the Currency have been developing frameworks for tighter regulation of fintechs.