BTC 15-minute short-term rally of 0.40%: ETF funds continue to flow in, and long-term holders buy the dip in unison

From May 28, 2026, 06:45 to 07:00 (UTC), BTC achieved a +0.40% return within 15 minutes, with the price rising slightly from 72,912.7 USDT to 73,205.7 USDT, a volatility of 0.40%. The return during this period was significantly higher than the overall 24-hour change rate at the same time (-0.0379%), indicating the presence of relatively clear upward pressure in the short term, and market trading sentiment has warmed.

The main driver of this anomaly is the sustained buying support from institutional funds. In May 2026, Bitcoin ETFs maintained strong inflows, achieving positive inflows for several consecutive weeks, with weekly net inflows reaching up to $1.05 billion, and total institutional inflows exceeding $56.5 billion. The continuous purchase of ETF funds provides direct liquidity support for the spot price and is the core factor driving the slight upward movement.

Additionally, bullish signals from technical analysis and on-chain holder behavior resonate. The MACD showed a bullish crossover at key time points, potentially triggering algorithmic trading strategies to buy; meanwhile, on-chain data shows long-term holders are accumulating, exchange balances are continuously decreasing, indicating reduced selling pressure and increased buying capacity. Furthermore, BTC remains highly correlated with risk assets like the Nasdaq (correlation coefficient around 0.85), and the macro market risk appetite's rebound also positively influences the price.

Short-term volatility risks should be monitored. The RSI approaching the overbought threshold of 70 may lead to technical corrections in the short term; if ETF inflows slow down or reverse, spot support could weaken. Key indicators to watch include: changes in ETF fund flows, whether the $68,500 resistance level can be effectively broken, fluctuations in exchange balances, and macro policy developments.