Ahead of the proposed interest rate hike by the US Federal Reserve, major cryptocurrencies took a sharp U-turn, amid heavy trading volume. The global crypto market cap crashed by 6.94 per cent to $2.07 trillion, while its trading volume is up by 12.57 per cent at a massive $116.64 billion which might indicate a panic selling event, showed Coinmarketcap data as of 8.14 am.