BTC options expiring 10SEP26, 3 days out, with the forward at $79,519. Open interest is $39M in calls and $11M in puts, put/call 0.27, and max pain is $79,500. At-the-money implied volatility is 32.6%. 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.