Crypto traders aiming to profit from a volatility surge should watch the Binance-listed ether-bitcoin (ETH/BTC) ratio, which could soon experience wild swings, according to a key indicator called Bollinger Bands.Bollinger Bands are volatility bands placed two standard deviations above and below the 20-day simple moving average of an asset's price.The so-called Bollinger band squeeze occurs when the bands contract tightly around the price, suggesting low volatility and a period of consolidation. The market typically builds energy during the squeeze, which is eventually released in either direction, leading to a volatility explosion
source: https://www.coindesk.com/markets/2025/05/05/ether-bitcoin-squeeze-hints-at-imminent-volatility-as-ethereum-spectra-upgrade-nears