According to @StockMKTNewz, April 9, 2025 marked the single largest daily point gain and the ninth-largest one-day percentage rise in S&P 500 history, signaling an extreme risk-on session in U.S. equities, source: @StockMKTNewz post dated Sep 28, 2025. Such outsized equity rallies have historically coincided with stronger cross-asset correlations between crypto and stocks, particularly BTC and ETH, reflecting a post-2020 regime shift in co-movements, source: International Monetary Fund, Crypto Prices Move More in Sync With Stocks, Jan 2022. For trading, monitoring BTC and ETH beta to U.S. equities and intraday liquidity on sessions resembling April 9, 2025 can help gauge directional risk and volatility spillovers from equities into crypto, source: International Monetary Fund, Jan 2022.