What is the currency in Cuba?
The currency in Cuba is the Cuban peso. 1 Cuban peso equals 100 centavo. Export and import of foreign currency by you is unlimited here, but national currency is prohibited. Also, credit cards issued by a US bank are not accepted for payment.
In Cuba, the free circulation of any currency. Here in foreign exchange stores accept converted pesos, called CUC (Convertible Peso). These banknotes outside the island have no value. Exchange rate 1CUC = 1,20USD (including bank fees). And for other foreign currencies, for example, the euro or the English pound, the exchange commission is 8%.
You can use plastic ruble cards, but you will be able to withdraw "dollars" from them at the rate of Mastercards or Visa, so it is better to buy dollars at home and exchange them in Cuba. Now you know what currency in Cuba!