An American express (AMEX) gift card is a prepaid payment card preloaded with a selected US dollar amount. They are accessible in $25, $50, $100, $200, and $500 denominations. American Express gift cards are acknowledged in virtually every store and retail outlet in America. Some online stores and gift card exchanges within and outside America also accept AMEX gift cards. AMEX gift cards can also be traded for cash, they do not expire.