BTC 15-minute short-term rally of 0.49%: large capital inflows combined with short covering resonance

From 09:45 to 10:00 (UTC) on April 29, 2026, BTC saw a short-term surge of +0.49% within 15 minutes, with a price range of 77,246.5 to 77,800.0 USDT and a volatility of 0.72%. This price move was accompanied by a clear rise in market attention, with the magnitude of volatility expanding compared with recent normal levels.

The main drivers of this move are twofold. First, on-chain data shows that on April 28, there was a net inflow of more than $10 million in large amounts of BTC, totaling 4,478.10 BTC, indicating that institutional or large-lot funds were concentratedly entering the market and providing liquidity support. Second, in the derivatives market, bearish sentiment is strong: the perpetual contract funding rate remains persistently negative (around -4.5%). Combined with the expiration of options worth about $14.16 billion on April 27, passive short covering or hedging activity by shorts directly drove the price higher.

In addition, spot ETFs continued to record net inflows (a single-day inflow of $331.9 million on April 23), strengthening institutional demand. A $15 billion U.S. Department of the Treasury bond repurchase operation released liquidity; major global stock indices rose, boosting risk appetite. Multiple factors resonated together. Inflows to offshore exchanges exceeded those to U.S. domestic exchanges, indicating increased activity from international funds.

On the risk side, after the concentration of options expirations, volatility may increase further; the sustainability of continued short covering remains to be seen. If macro liquidity turns or ETF inflows weaken, price support could be reduced. Short-term investors should monitor on-chain fund flows and volatility in the options market. The key support level to watch is around 77,000 USDT.