Polkadot (down 9%), Dogecoin (down 8%), Binance Coin (down 6%), and Cardano (down 6%) have all seen their prices fall in the last 24 hours. According to CoinGecko, the total crypto market cap has shrunk by around $90 billion (4 percent) since yesterday. In financial terms, it's barely short of a market correction after most of the biggest cryptocurrencies saw double-digit percentage gains in the previous month.