ETH has been buoyed by favorable regulatory developments that appear to point growing probabilities of spot ether ETFs being permitted by the SEC after the regulator requested exchanges to replace 19b-4 filings, which suggest rule adjustments. Because of this, the ether implied volatility curve, which exhibits market expectations of future volatility throughout totally different strike costs and expirations, flattened as 25-delta threat reversals hit year-to-date highs above 18%, and merchants closely purchased $4,000 calls for twenty-four Might and 31 Might, Presto Analysis analysts wrote. A Polymarket contract asking if an ether ETF can be permitted by Might 31 jumped from 10 cents to 55 cents, representing a 55% probability that approval will happen by then.