American Express has introduced an electronic wallet to the US? When did that happen then?. ExpressPay is a keychain RFID tag which debits accounts at a swipe. Max spend $150.00 a day.

‘You just hold your ExpressPay at a reader that’s located by the checkout to pay for your purchases. Radio signals from the radar capture information on your key fob and authenticate the transactions just like on your credit card – except no signature is required.’