One glance at the whole market's health: how many coins are actually rising, how broad the move is, and where the money is leaning.
Market breadth counts how many coins are moving up versus down, instead of watching prices alone. A rally where 80 of the top 100 coins advance is broad and healthy; one where Bitcoin rises while most coins fall is narrow and fragile. Breadth is computed from Coinlib's own market snapshots of the top 1,000 coins, sampled around the clock. Daily history compares each coin's closing price against the previous day.