📚 Science popularization post: The current DVOL volatility index of ETH is 74.88 (high volatility). Sell a put option of 1400 at the end of May. If the ETH price is higher than 1400 at expiration, the coin base premium income will be 4.25%, with an annualized yield of about 25.84% 🤑， If it falls below 1400, a bottom spot position can be established at a cost of approximately 1340.