What is Spread
The gap between an exchanger's buy and sell rates, its main source of income.
If an exchanger sells USDT at 458 ₸ and buys at 448 ₸, the spread is 10 ₸, or about 2.2%. Buy and immediately sell, and you lose exactly the spread.
A narrower spread means a cheaper exchange. But a service fee and size-based markup can come on top, so compare the final amount in the calculator.