The minimal order amount may perhaps vary because it is determined by the decided on fiat gateway. Generally, the least order begins at $20 (or maybe the equivalent sum in your local fiat currency). Some cryptocurrencies call for you to enter an additional ID/memo tag to finish the transaction. https://financefeeds.com/best-cryptos-to-buy-now-march-31st-key-investments-you-cant-afford-to-miss/