Call wall and put wall: do they actually hold?
The call wall and put wall are the two most-quoted levels in options analysis: the strikes carrying the heaviest positive and negative gamma, drawn as a ceiling and a floor. The pitch is that price respects them. We ran the test, including the control almost nobody runs, and the honest answer is more useful than the popular one.
What the walls actually are
The call wall is the strike with the largest positive dealer gamma above price; the put wall is the largest negative gamma below it. Both come from open interest — positions that already exist — so they describe where hedging pressure is concentrated, not where money is trading today.
That distinction matters. Open interest is a photograph of accumulated positioning. It can be weeks old.
The test everybody skips
Most published wall statistics compare a hit rate to fifty percent. That is the wrong baseline. The right question is not 'how often did the wall hold' but 'how often did it hold compared to a line drawn at random the same distance from price'.
So we ran exactly that. Across 742,863 dealer walls we asked how often each was not broken the following session, then asked the same of an arbitrary price at a matched distance on the same side, same symbol, same day.
The result
Walls went unbroken 87.6% of the time. Random lines at the same distance went unbroken 87.5%. The difference is a rounding error.
And the distance breakdown explains why the headline number is so high in the first place. A wall sitting within half a percent of price is unbroken only about 31% of the time. One sitting more than four percent away is unbroken about 97.5% of the time — because price rarely travels that far, not because the wall did anything.
Fifty-eight percent of all walls sit more than four percent from price. That single fact produces almost the entire 87.6%.
So are walls useless?
No — but they are structure, not a forecast. They tell you where dealer positioning is concentrated, which is genuinely worth seeing. What they do not do is tell you that price will turn there more often than it would at any other price the same distance away.
This is why FlowMonkey stopped attaching hold-rate percentages to levels. We still draw the walls, because they are real. We just price each one by the question that has a measurable answer: how likely is your ticker to reach it today.
A wall's reputation comes mostly from how far away it usually sits. Judge a level by whether price can reach it, not by a hold rate quoted without a control.
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See it on a live board
FlowMonkey prices every level by whether your ticker can actually reach it today — measured on that symbol's own range, re-sorted as the session burns down.
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