# OI Crossover Scanner — StockMojo

> Bullish and bearish OI trend reversal scanner

- Live page: https://stockmojo.in/oi-crossover
- Content last updated: 2026-04-22
- Platform: StockMojo — free options analytics for Indian markets (NSE F&O)

This is a machine-readable markdown mirror of the live tool page. The live page shows real-time NSE data during market hours (09:15-15:30 IST) and supports 200+ F&O symbols via per-symbol URLs like https://stockmojo.in/oi-crossover/banknifty.

## Frequently asked questions

### What is an OI crossover, in plain English?

It's the moment total put open interest crosses above (or below) total call open interest on a given symbol. Most days that line stays on one side. The minutes when it flips are usually when something has actually changed in positioning. Traders treat the crossover itself as the signal, not the absolute levels.

### Why does a put-over-call crossover matter for Nifty?

Puts crossing above calls means writers are committing fresh capital to defend lower strikes. On Nifty that has historically lined up well with the start of multi-day rallies. The April 2024 election rally, the post-COVID March 2020 lows, and several earnings-driven moves in BankNifty all started with a clean OI crossover within the first hour of trade.

### How is this different from a simple PCR reading?

PCR tells you the current ratio. The crossover tells you when the ratio actually flipped sides. A PCR of 1.05 today versus 0.95 yesterday is the kind of move that hides in noise unless you're watching the OI lines themselves. The scanner highlights the exact session and bar where the cross happened so you don't have to eyeball it.

### Are individual stock crossovers more reliable than indices?

Often, yes. Stock OI is concentrated in fewer strikes, so the lines move with cleaner direction. RELIANCE, ICICIBANK, HDFCBANK, and the heavyweight private banks tend to give the cleanest crossovers. Mid-cap F&O stocks can be noisy because their OI is thinner and a single fund's positioning shows up as a false flip.

### Should I trade every crossover the scanner flags?

No. Crossovers in choppy ranges are noise. The actionable ones happen alongside price confirmation: a put-over-call cross while spot is breaking above prior resistance, or a call-over-put cross while spot is breaking down. The scanner shows the price context next to each flagged event for exactly this reason.

### How quickly does the scanner pick up a new crossover?

The scanner runs on the same NSE option chain feed the live tools use. New crossovers appear within seconds of the OI data updating, which is roughly every 1 to 3 seconds during market hours. There's no manual refresh needed.

## How to use the OI Crossover Scanner

1. **Open the scanner** — Land on the OI Crossover page during market hours. The dashboard auto-populates with every fresh crossover from the current session.
2. **Filter by symbol or sector** — Narrow to the names you actually trade. Most retail traders watch Nifty, BankNifty, FinNifty, plus a handful of stocks.
3. **Read the direction tag** — Each row is tagged bullish (put OI crossed above call OI) or bearish (call OI crossed above put OI). The colour coding makes scanning fast.
4. **Cross-check with spot price** — Click a row to see the chart. Strong setups have OI direction and spot direction agreeing in the same window.
5. **Set your conviction threshold** — Treat early-session crossovers (before 10:30 IST) as higher-conviction since they capture institutional positioning. Late-day flips are usually unwinds, not fresh commitment.

## Related tools

- [Call vs Put OI Chart](https://stockmojo.in/call-vs-put-oi) — markdown: https://stockmojo.in/call-vs-put-oi.md
- [Put Call Ratio](https://stockmojo.in/put-call-ratio) — markdown: https://stockmojo.in/put-call-ratio.md
- [Smart OI Detection](https://stockmojo.in/smart-oi) — markdown: https://stockmojo.in/smart-oi.md

## Glossary

Terms used: call-oi, put-oi, pcr, oi-crossover. Definitions: https://stockmojo.in/glossary