A stop-loss is wisely placed on the other side of a level at which price has reversed previously, the more times the better. For example, Coinbase has an exchange fee of 3. Bitfinex offers very low fees even for low volume buyers, at 0. Still, the hack is scaring some people away. CoinMarketCap is the most popular way to check cryptocurrency exchange rates. Among pure crypto exchanges, Binance has the lowest fees.