Learn more about RockItCoin in the Press. Our ATMs allow you to purchase bitcoin easily with physical cash in as little as 90 seconds. Sep 12, This will help a lot in making sure your transaction confirms quickly so you get your cash and go! More Americans Choosing Bitcoin ATMs Despite Regulations Despite the higher fees associated with buying or selling Bitcoin via specialized Bitcoin ATMs, quicker and more reliable delivery have seen rising popularity for the machines in the United States, even as ATM networks struggle to expand within strict regulations in the country.