OI Buildup as Money Flow in Nifty

OI buildup = new positions, not just price. When OI rises at a call strike with price up, money is committing bullish; same for puts down. The signal is clearest at ATM +-2 strikes where liquidity concentrates. Feature oi_buildup = change in OI at those strikes, signed by direction. Combine with PCR: bullish OI + PCR < 1 = genuine confidence; bullish OI + PCR > 1.3 = hedging, not conviction. AI weights oi_buildup against iv_skew and vix_india. Rule: OI tells you where money sits; it does not tell you when it leaves. Pair with a catalyst/regime check before acting.