 Major financial entities now offering contactless payment systems include Mastercard, China UnionPay, Citibank, JPMorgan Chase, American Express, KeyBank, Barclays, Barclaycard, HSBC, Lloyds Banking Group, FreedomPay, The Co-operative Bank, Nationwide Building Society and the Royal Bank of Scotland Group.Visa payWave, American Express Expresspay, and Mastercard Contactless are examples of contactless credit cards which have become widespread in the U.S. and U.K. 

Security researchers have found that the cardholder's name, credit card number, and expiration date may be transmitted by contactless payment cards without encryption.They were able to use information leaked from a contactless credit card to make a purchase online, without opening the envelope in which the card was sent.