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Index ATM straddle premium

Spot — · ATM strike —
Expiry — · Updated —
How to read: We add the call LTP + put LTP at the strike closest to spot (ATM). That combined number is the market's price for expected movement until expiry. ↓ Falling = volatility expectations easing or time decay. ↑ Rising = market paying up for bigger moves.
Combined now
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Window change
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High in window
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Low in window
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Volatility mood
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range vs recent
Combined call + put premium over time

Why can premium fall when the index is flat?

Time decay (theta) shrinks premium every minute. IV can also fall if traders stop paying up for protection.