I’ve never had one turned down.
They use the same system of quarters, dimes, nickels and pennies as the United States. I’ve never met a business here yet that will turn them down.
Is the exchange rate exactly the same? No. Does it matter? No.
We use them interchangeably as do they accept ours. The differences are simply too insignificant to matter.
I once traveled to the south with a pocketful of international coins. Out of habit, I handed a cashier a Canadian coin and was nearly arrested for fraud. You would have thought I was printing money in my basement by the reaction I received. I understand the reaction. After all, that coin “isn’t from around here.”
But if you stop and look at it a little closer, it isn’t as different as it seems at first.
Joel Stiff's Adventure 