This chart shows the market cap of alt coins divided by the market cap of bitcoin.
When it's above the linear regression line alts are probably overvalued.
Right now we're at a point where btc is basically flat with very little volume while alts are flying high. This seems suspect to me.
I actually have been scalping alts long a bit since there's nothing else...
the graph start in record price in 2017. when stay red them bitcoin up togheter with crypto market down or neutral. If is green btc down and crypto market up or neutral. basically you can see percentual change in terms of bitcoin value.