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Official template · advanced · Key levels

Explore a configurable open-interest ladder.

See where open interest actually sits by strike before you treat a GEX wall as the book.

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Pure OI Ladder · 21-second walkthroughMarket session Sep 25, 2026

The report UI is recreated from the test app's Sep 25, 2026 session, not a live screen. A historical example with music; no narration.

Pure OI Ladder · real test-app reportMarket session Sep 22, 2026Swipe to inspect →
Real Pure OI Ladder report in the TradingFlow test app, showing Top OI concentrations for the September 22, 2026 market session.

Captured Sep 23, 2026 on testapp.tradingflow.com. This is a historical example; results on this page do not refresh. Swipe across the image to inspect its columns.

Pure OI Ladder · how the report is assembledConceptual map
  1. 01Symbol + strike window
  2. 02Sum call / put OI
  3. 03Concentration ladder

No gamma weighting or max-pain payout.

Read the output

  1. 01Call OI and put OI by strike in a reader-tunable DTE window and spot band.
  2. 02Heaviest call-OI strike and heaviest put-OI strike in that band.
  3. 03SPX/NDX weekly-root fold (SPXW/NDXP) so near-dated OI is not dropped.

Keep in mind

OI concentration is not a GEX wall. Walls weight gamma.

How to read it

From report to evidence

  1. 01

    Run the ladder

    Open Pure OI Ladder in Cookbooks and set the symbol (SPY default). Widen DTE for single names.

  2. 02

    Compare OI walls to GEX walls

    If the heaviest call OI strike disagrees with Gamma Structure Map’s call wall, you are looking at two different constructions.

  3. 03

    Do not fade OI as a magnet

    Use Max Pain if you want the OI-payout strike. Use the tape if you trade the level.

Method and limitations

A paid Cookbook of the standing book by strike: call OI vs put OI on the chain snapshot. SPX/NDX fold weekly roots. It is not GEX-weighted walls and not max pain. Official app template: Pure OI Ladder.

What the report computes

  • Call OI and put OI by strike in a reader-tunable DTE window and spot band.
  • Heaviest call-OI strike and heaviest put-OI strike in that band.
  • SPX/NDX weekly-root fold (SPXW/NDXP) so near-dated OI is not dropped.

What it does not claim

  • OI concentration is not a GEX wall. Walls weight gamma.
  • A high-OI strike is not max pain (max pain minimizes holder payout).
  • It is not support, a pin, or a live dealer book.

The ladder is OptionContract.openInterest by strike with no gamma and no payout curve; SPX/NDX include weekly roots so 0DTE OI is not silently dropped.

Frequently asked questions

Is the call OI wall the same as the GEX call wall?
Usually not. This ladder is raw OI. Gamma Structure Map weights gamma × OI. That is why both recipes exist.
Is the heaviest OI strike max pain?
No. Max pain minimizes aggregate holder payout across the chain. A pile of OI at one strike is a different number.

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Related glossary

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The public page explains the report. Run the official template in TradingFlow for a selected completed market session.

Open OI ladder · Advanced
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