Currency: The currency in America is the dollar (USD, symbol $) = 100 cents. Notes are in denominations of $100, 50, 20, 10 and 5. Coins are in denominations of 1 cent, 5 cents (nickel), 10 cents (dime) and 25 cents (a quarter).
There are only a couple of ATMs within Grand Canyon National Park itself: two at the South Rim (at Chase Bank, in Market Plaza next to the Canyon Village Marketplace, and at Maswik Lodge), and two at the North Rim (at the General Store and in the Roughrider Saloon at Grand Canyon Lodge). It is therefore advised to make sure you have sufficient cash on you before arriving at the park.