Heatmap of model-interpolated implied volatility across option delta at a fixed 1-week tenor for the IBIT ETF. The vertical axis represents option delta, with positive values corresponding to call options and negative values corresponding to put options. Each cell shows the implied volatility at the given delta for 1-week expiries, obtained via interpolation across strikes and maturities. IBIT options follow US equity market hours (9:30 AM–4:00 PM ET, Mon–Fri); data will appear flat outside trading sessions and on weekends/holidays.