When you choose a market order, you buy crypto at the lowest price and sell at the highest price currently available on the market. It is the quickest way to buy/sell currency, but it can also be quite tricky. You cannot specify the exact price at which your order should be filled. With the cryptomarket often being quite volatile, you risk making a bad investment.
Thus, you may end up buying coins at a higher price or selling them at a lower price than anticipated. To avoid this issue, you will need to be very careful when checking the coins’ volume available on your chosen market.