The currency of Guatemala is the quetzal (GTQ), which is named after Guatemala's national bird. You’ll find ATMs in larger towns and cities, and credit cards are accepted in some hotels and larger shops, although you may have to pay a surcharge to use them. Visa is more widely accepted than Mastercard.
US dollars are accepted and changed in all banks, but it’s a good idea to ask for small denomination quetzal notes because vendors and retailers in smaller towns and local markets rarely have change.