What fraction of the top 100 altcoins are outperforming Bitcoin? Updated every 15 minutes from CoinGecko.
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What is crypto market breadth?Market breadth measures how broadly a move is shared across the market — not just whether the index (Bitcoin) is up or down, but how many coins are participating. Strong bull markets typically show wide breadth (most altcoins outperforming BTC), while late-cycle or bear markets show narrow breadth (BTC holds up while alts underperform). The advance-decline ratio below 50% often precedes broader market weakness; a recovery above 60% breadth can signal strengthening risk appetite. This information is market data only and is not financial advice.