Each country in South America has its own currency except Ecuador, which uses the US dollar. The easiest currency to exchange is US dollars, but euros can often be changed too. The currencies in use right now are the Argentine peso, the Bolivian boliviano, the Brazilian real, the Chilean peso, the Colombian peso, the Guyanese dollar, the Paraguayan gurani, the Peruvian nuevo sol, the Surinamese dollar, the Uruguay peso and the Venezuelan bolívar.