Philadelphia Fed Finds Bitcoin Traders Sprint After 'Whale' Alerts, Ethereum Lags

Good morning, crypto sleuths: a Philadelphia Federal Reserve working paper just peeked under the hood of on-chain behavior and found that when a giant transfer gets publicly announced—those dramatic “whale alerts”—Bitcoin wallets tend to react way faster than Ethereum wallets. Think: frantic first-15-minutes trading on BTC, and a much calmer pond over on ETH.

What the researchers did and what they saw

Researchers matched timestamps of public large-transfer notifications with on-chain transfers of Bitcoin, Ethereum, and wrapped Bitcoin through the end of 2025. They called a wallet a “whale” if it had ever moved more than $50 million in one transfer, and they filtered out wallets tied to exchanges or smart contracts. To keep events isolated, the team only analyzed transfers with no other whale transaction within two hours before or after — leaving a sample of 6,645 BTC whale moves and 5,075 ETH whale moves.

The headline: non-whale Bitcoin wallets became noticeably more active in the first 15 minutes after a whale alert, mostly following the whale’s direction. Small wallets raised buy participation by about 14.8 percentage points, medium wallets by about 23.7 points, and large non-whale wallets by roughly 3.5 points after whale buys. After whale sells, sell participation jumped by about 13.0, 29.5, and 3.0 points for small, medium, and large wallets, respectively. That spike then faded toward normal within an hour.

Ethereum painted a different picture. Post-alert participation on the Ethereum network stayed pretty steady across most wallet sizes. The clearest same-direction response showed up only among the largest non-whale addresses after a whale sell; medium-sized ETH wallets barely cleared the weaker statistical cutoff used in the paper. In short: BTC acts like a startled school of fish; ETH is more like a chill lake.

Volatility, interpretation, and caveats

Volatility results split the networks too. Bitcoin saw a temporary bump in realized volatility at short horizons after these alerts, but that effect tended to reverse within 24 hours. Wrapped Bitcoin on Ethereum showed no distinguishable effect. Surprisingly, realized volatility on Ethereum was lower following alerts, which suggests large ETH transfers often happen during quieter market stretches.

The authors offer a market-structure explanation: Ethereum activity frequently routes through exchanges, smart contracts, and Layer-2 systems where many smaller transactions get batched into larger balance updates. That aggregation could mute immediate on-chain reactions compared with Bitcoin. The contrast held even after Ethereum’s September 2022 switch to proof-of-stake, so it doesn’t look like consensus mechanism differences are the whole story.

Important caveats: this is observational analysis, not a randomized experiment. Wallet-size groups are proxies based on transaction history (one person can control many addresses), and activity tied to exchanges was excluded—so the paper documents patterns around public alerts rather than proving the alerts caused every observed move.

Bottom line: if you pride yourself on being first to the pump following a whale alert, Bitcoin traders are more likely to be the ones sprinting out of the gate. Ethereum users? More like the stoic marathoners—calm, collected, and suspicious of unnecessary drama.