According to @rovercrc, $4.21 billion in Bitcoin (BTC) and Ethereum (ETH) options are set to expire today, creating a near-term volatility risk for both assets, source: @rovercrc. The post explicitly warns to expect big volatility and was published on Sep 12, 2025, source: @rovercrc. No exchange, strike distribution, or maturity breakdown was provided in the alert, so the figure and timing should be treated as coming solely from this X post, source: @rovercrc.