ATM premium decay
Pick any options (defaults to the ATM straddle — or build a custom basket) and chart their summed mark premium over time.
Premium sellers ↓ want this line falling — decay is their P&L.
Premium buyers ↑ want it rising — the move must outrun the decay.
No mark history for this selection yet — try a nearer expiry or a smaller window.
Mark-price history per 1 BTC of notional (5-minute closes, qty-weighted). Falling combined premium is the short seller's profit and the long holder's decay — the strangle/straddle burn-down view.