Bitcoin and Ethereum options worth about $16.5 billion are due to expire on Deribit at 08:00 UTC on September 25, based on updated exchange figures. The Bitcoin contracts represent about $14.4 billion in notional value, with a put-to-call ratio of 0.84 and a maximum-pain price of $78,000. Ethereum options account for a further $2.1 billion, with a 0.66 put-to-call ratio and a $2,350 maximum-pain price. The revised Bitcoin value is below earlier estimates of about $15.6 billion, while the updated ratios show more put positioning than previously reported. Large expiries can affect market conditions as traders close, roll or hedge options positions around major strike prices.