All money is barter. Almost nobody realizes this, however.
Money is not separate from barter exchange, but rather, it is simply that thing which is most bartered for. The thing people barter most often with is de facto money. Seashells, cigarettes, gold coins, USD paper, bitcoins, etc... these are all things we barter for, and at any given time whichever among them is often used for exchange and trade is simply called money.
This is why it's ironic and somewhat hilarious when certain types of people say, "man, we need to get rid of money and just go back to barter!"
Your putting USD in the same category as gold & bitcoins... really?