Between 13:30 and 13:45 (UTC) on 2026-04-15, the BTC price fluctuated within the 73,846.3 to 74,415.9 USDT range. In the 15-minute window, the return recorded -0.70%, with a range (amplitude) of 0.77%. During this period, market volatility intensified: trading volume and on-chain transfers heated up significantly, and market participants’ risk sensitivity increased.
The main driving force behind this anomaly was a sharp increase in ETF fund outflows. Data shows that on 2026-04-13, U.S. spot Bitcoin ETFs recorded net outflows of -$231.7 million, far exceeding the weekly average. As a result, related ETFs were forced to sell large amounts of BTC spot holdings, directly creating short-term sell pressure. This outflow closely coincided with the time when the anomaly occurred, prompting the spot market price to adjust downward rapidly.
In addition, positioning adjustments in the derivatives market reinforced and amplified this round of volatility. Total open interest in BTC futures and options was at a high level. Within the short term, 21,001 related options contracts concentrated into expiration, with the put/call ratio at 0.48, indicating that longs were dominant. With ETF sell pressure, some leveraged long positions were forced to unwind. Derivatives annualized volatility (DVOL) reached 76%, the highest level in 16 months. Meanwhile, major trading platforms continued to see net outflows on the BTC on-chain flow. The SMA30 indicator turned negative, and multiple large transfers of more than 1,000 BTC became frequent; some flows went to cold wallets. Liquidity was temporarily tight, further increasing the downward move—multiple factors in sync amplified the market anomaly.
The market still faces downside pressure from continued ETF outflows, so it is necessary to closely monitor the movements of institutional investors and changes in ETF fund flows. A high-volatility derivatives market and shifts in the flow of large on-chain funds may both trigger a new round of stop-loss selling, fund transfers, and price diffusion. For short-term users, it is important to strictly watch BTC’s key support levels and mainstream platform fund inflow/outflow data to guard against the risk of extreme volatility. For further market information, pay attention to on-chain fund flow trends and derivatives market developments.
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