A Federal Reserve Bank of Philadelphia working paper finds that smaller Bitcoin wallets sharply increase trading activity within 15 minutes of a publicly flagged whale transfer, while Ethereum wallets barely respond. The effect fades within an hour, and the authors stop short of claiming the alerts cause the trades.
Smaller Bitcoin wallets move fast once a large transfer hits the public record. A new Federal Reserve Bank of Philadelphia paper, catalogued as WP 26-42, finds that non-whale wallets lift their trading activity within 15 minutes of a whale transaction being flagged by Whale Alert, a service that broadcasts large crypto transfers.
Buy and sell signals move fast
Researchers paired on-chain transaction data with Whale Alert notifications, covering more than 6,600 Bitcoin transactions and 5,000 Ethereum transactions from December 2017 through December 31, 2025. They defined a whale strictly: only transfers above $50 million qualified, with exchanges and smart contracts excluded to isolate individual large holders.
The reaction was immediate. Small and medium Bitcoin wallets lifted their buy participation by 14.81 to 23.72 percentage points in the 15 minutes after whale buy signals. Sell participation rose by 12.95 to 29.52 percentage points after whale sell alerts, and both results were statistically significant at the 1% level. In raw terms, small wallet activity jumped from 18.6% to 33.2%. Medium wallet activity climbed from 33.8% to 57.9%.
Bitcoin also saw a brief volatility spike in the 24 hours after whale activity, with the sharpest move coming after Wrapped Bitcoin alerts specifically.
Ethereum barely reacts
Ethereum told a different story. ETH and Wrapped Bitcoin showed little to no measurable reaction to whale alerts, and the strongest Ethereum response came from the largest non-whale sellers, who shifted participation by just 0.76 percentage points. Ethereum volatility stayed lower and more stable after large transfers than Bitcoin's did.
The researchers frame the gap as evidence of structural and informational asymmetries between the two networks. Bitcoin's simpler transaction structure may make a large transfer easier to read as a signal, while Ethereum activity is tangled up with exchanges and smart contracts that can obscure the picture.
Correlation, not a trading manual
The authors are careful about what the data does and doesn't show. They do not claim traders acted because of the alerts, and they do not assess whether following whales was profitable. The effect also doesn't last: directional participation drifted back toward baseline within an hour.
Open questions remain about whether the alerts actually drive these trades, and whether the smaller wallets piling in come out ahead.
Source: Crypto Briefing
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