According to Odaily, the EthVol index, launched by financial index company T3 Index in partnership with options trading platform LedgerX, has seen a decrease to 55.59, a daily drop of 2.18%. This is close to the lowest level since the end of February. The EthVol index measures the expected implied volatility derived from the tradable Bitcoin options prices. Implied volatility refers to the volatility implied by the actual options price. It is the volatility inferred by using the B-S options pricing formula, substituting the actual option price and other parameters into the formula, excluding volatility σ.