Bitcoin declined during a broader market retreat, with reports measuring the move at 2.7% to an intraday low of $82,780 on September 28 and 1.7% to about $83,000 in a later update. Gold and silver also sold off, the CoinDesk 100 fell 2.6% as Friday's biggest gainers reversed course, and oil climbed back above $100. Derivatives data showed reduced futures participation, with open interest near 652,000 BTC versus an 800,000 BTC peak at the start of the year, while perpetual-futures funding averaged around -0.3% across major exchanges despite Bitcoin's 40% third-quarter gain. Options markets also turned more defensive as Bitcoin and Ethereum faced selling pressure: Bitcoin's seven-day skew fell to -0.45 volatility points, favoring puts over calls, but traders did not show the aggressive downside-hedging demand associated with panic. Ethereum calls remained more expensive than puts, although their premium narrowed.