This is very common
all over the world. If you are going to be touring, especially walking tours, always carry some coins in the local currency.
Also carry some tissue paper, or toilet paper in your pocket or purse because a lot of the public restrooms do not have paper.
In Poland it was funny because the public restroom was "free" but you had to pay for the toilet paper.
When you're outside the USA you are no longer in the USA.