Cash App is a mobile payment service developed by Square, Inc., allowing users to transfer money to one another using a mobile phone app. Users can choose to withdraw the money with its debit Visa card (dubbed as Cash Card) in ATMs or transfer it to any local bank account. Square first launched BTC trading on the Cash App in November 2017. As of August, 2018, the service recorded a total of more than 33.5 million downloads.