Market Regime Check

The end-of-day structure read for index options: where the OI walls sit, what the options market implies (ATM IV and its percentile rank), whether puts or calls dominate (PCR), and the strike option writers are defending (max pain). Recorded daily at the close — not a live tick.

Session: 2026-08-19 (EOD)

Bank Nifty

nearest expiry 2026-08-25

Close (spot)

57,240

Max pain

58,000

+760 (1.3%)

PCR (OI)

0.71

call-heavy

ATM IV

0.1%

percentile accruing

Support (put wall) 57,000Resistance (call wall) 58,000

Nifty 50

nearest expiry 2026-08-25

Close (spot)

24,078

Max pain

24,500

+422 (1.8%)

PCR (OI)

0.70

call-heavy

ATM IV

0.1%

percentile accruing

Support (put wall) 24,000Resistance (call wall) 24,500

Share today's check

Market regime check · 2026-08-19 (EOD)
Bank Nifty: spot 57,240 · max pain 58,000 · PCR 0.71 · ATM IV 0.1% · S 57,000 / R 58,000
Nifty 50: spot 24,078 · max pain 24,500 · PCR 0.70 · ATM IV 0.1% · S 24,000 / R 24,500
optixa.in/regime

How to read it

OI walls: the strike with the most call open interest acts as resistance; the biggest put-OI strike as support. Breaks of these levels with OI unwinding are regime changes.
Max pain is the strike where option buyers collectively lose the most. Price gravitating toward it into expiry is common; large distance means tension.
PCR above ~1.2 = put-heavy positioning (often support-building); below ~0.8 = call-heavy.
ATM IV percentile tells you whether options are expensive or cheap versus the past year — the difference between selling premium and buying it. The percentile gets sharper as the recorded history grows.

Data is recorded from the option chain at the close of each trading session. For information and education only — not investment advice or a recommendation to trade.