Legal tender
The Swiss franc is also the currency used for administrative and accounting purposes by most of the numerous international organisations that are headquartered in Switzerland.
Microstates and the European Union
Andorra, Monaco, San Marino, and the Vatican City use the euro through monetary agreements with the EU, and have been granted the right to issue a limited number of euro coins. They were allowed to do so as they had used or been tied to the old eurozone currencies. Liechtenstein, on the other hand, uses the Swiss franc.