Alt coins have been doing really badly for over a week now, not sure why haven't seen it this bad in previous BTC rallies.
The top 10 market cap coins are really struggling against BTC, even ETH is down over 30% in the past couple of weeks.
The crazy thing is that BTC only represents 38% of the crypto market cap, in other words the alt coins represent 62%.
I blame the exchanges. They are slack when it comes to USD or USDT alt coin pairs. They prefer to pair only with BTC.
If most alt coins were able to pair with fiat instead of going through BTC the market would improve greatly in terms of independence.