BTC options expiring 12SEP26, 4 days out, with the forward at $78,434. Open interest is $423M in calls and $6M in puts, put/call 0.01, and max pain is $78,000. At-the-money implied volatility is 38.5%. Where a strike is listed on both venues the cheaper ask and richer bid are visible side by side; the arb scanner flags any gap that exceeds fees. Strikes shown are within 60% of the forward. All BTC expiries.