BNB, the native token of Binance, has gained approximately 25% in the past week after dropping to $514 on March 11.Binance launched a six-month zero-fee swap promotion for Binance Wallet users, which could attract more traders.BNB is showing signs of a bullish reversal after forming a double bottom pattern on the three-day chart.If the uptrend continues, BNB could rise above $680, triggering a rally toward $720, followed by $750 and $800.