Bitcoin (BTC), Ether (ETH) Prone to Topside Volatility as $15B Options Expiry Looms

“The big impact, however, is [from] the gamma positioning of dealers into the event. Dealers are short some $50 million of gamma, with the majority focused at around the $70,000 strike. As we near the expiry, that gamma position gets larger and the forced hedging will exacerbate volatility around $70,000, providing for some wholly, choppy moves either side of the said level,” Brickell told CoinDesk.