The Vatican has a unique, noncommercial economy that is supported financially by contributions known as Peter's Pence from Roman Catholics throughout the world. It also sells postage stamps, tourist mementos, and publications. Fees for admission to museums also go into church coffers.
Rome/Vatican has the euro EUR, € as its currency. Therewith, Rome/Vatican belongs to the 23 European countries that use the common European money. These 23 countries are: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia and Spain official euro members which are all European Union member states as well as Andorra, Kosovo, Monaco, Montenegro, San Marino and Vatican which use it without having a say in eurozone affairs and without being European Union members. These countries together have a population of 327 million.
One euro is divided into 100 cents. While each official euro member as well as Monaco, San Marino and Vatican issues its own coins with a unique obverse, the reverse as well as all bills look the same throughout the eurozone. Nonetheless, every coin is legal tender in any of the eurozone countries.
The Vatican euro is the rarest in circulation among the European countries, so don't spend it! It is worth a lot more than its face value.
The Vatican is the only country in the world where ATM instructions are available in Latin.