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Stablecoin dominance measures the share of stablecoins in total crypto market cap. Rising dominance often means traders are de-risking, moving into cash positions, while falling dominance suggests re-entry into risk assets. Tracking this metric alongside Bitcoin dominance can clarify whether capital is flowing into BTC, altcoins, or safe-haven stablecoins. High stablecoin dominance during market dips may indicate strong buying potential once sentiment improves.