Leading cryptocurrencies traded flat Sunday ahead of Federal Reserve Chair Jerome Powell’s speech on the direction of interest rate cuts in the coming months. What Happened: Bitcoin spiked above $66,000 during the afternoon hours but started to descend as the evening progressed, falling as low as $65,121 overnight. Ethereum also encountered choppy behavior in the $2,600 region Bitcoin gained more than 10% in September, its best performance in a month with a historical average loss of 3.47%. The rally has been broadly fueled by the central bank’s aggressive 0.5% rate cut earlier this month. Tot…