OIStats
Visual bar chart of Call and Put Open Interest at each strike, with time slider replay and OI change overlay. Identify key support and resistance levels at a glance.
What OI Stats shows
The whole strike ladder as a bar chart: call open interest against put open interest at every strike, with today's increase or decrease shaded on top of the standing position. A table of numbers makes you hunt for the heavy strikes; a chart makes the walls obvious. A time slider replays the session so you can watch those walls build or crumble through the day rather than reading only the closing shape.
How to read the chart
- The tall bars are the walls — the strikes carrying the most open interest are where writers have the most at stake, and they tend to defend them.
- Call OI above spot — heavy call open interest overhead usually behaves as resistance, because the writers of those calls lose if price pushes through.
- Put OI below spot — heavy put open interest underneath usually behaves as support, for the mirror-image reason.
- The change overlay — shading shows today's addition or removal. A wall that is still growing is being defended; one that is shrinking is being abandoned, and it stops being a level.
- The time slider — replays the session. Watching a wall relocate mid-session is often more informative than its final position.
Frequently asked questions
Option writers at a heavily-written strike lose money if price moves through it, so they hedge in the direction that resists the move. That hedging is not a guarantee, but it concentrates real flow at specific prices, which is why those strikes often act as levels.
Both, in that order. The total shows where positions have accumulated, and the change shows whether that wall is being reinforced or dismantled today. A large wall that is unwinding is a level about to stop working.
Yes, though single-stock chains have fewer strikes and wider spacing, so the picture is coarser and a single strike unwinding can reshape it more dramatically than on an index.