From the class of unnecessary things which imply a lot of work and resources, Ladies and Gentlemen, here you are the QUID! The foreign exchange company Travelex asked for, and the scientists from the National Space Center and the University of Leicester designed it: it is called the Quasi Universal Intergalactic Denomination (Quid) and it is designed to withstand the stresses of space travel and has no sharp edges or chemicals that could hurt space tourists.
So, in case if you have to travel intergalatically, take some Quids with you.