On March 18th, as multiple key U.S. economic events converge, the cryptocurrency market is on high alert, preparing for significant volatility. The release of Producer Price Index (PPI) data, the Federal Reserve's interest rate decision, and subsequent remarks by Federal Reserve Chair Jerome Powell are expected to have a major impact on Bitcoin and altcoin prices. Bitcoin is currently hovering around 74,000 dollars, with technical analysis suggesting that a break below 73,900 dollars could trigger a sharp selloff targeting around 71,000 dollars; meanwhile, a breakout above 74,450 dollars could signal a push toward the resistance zone of 75,700 to 76,000 dollars. Ethereum is showing relatively strong performance, while altcoins such as BNB, XRP, and Solana are testing critical breakout levels.