OI Clustering Heatmap

PRO

Open Interest & Flow · HTTP Data · Pro Tier

Overview

The OI Clustering Heatmap visualizes where open interest concentrates across the strike chain. Rather than showing OI as bars, it uses scatter, bubble, and heatmap modes to reveal the density of positioning — making it easy to spot "magnet" strikes where OI clusters most heavily.

Strikes with high OI act as gravitational centers for price. Market makers must hedge against these positions, creating predictable flow patterns around the densest clusters. This window helps you identify those clusters at a glance.

OI Clustering Heatmap showing open interest density across strikes and expirations — intensity indicates concentration levels

Key Features

3 visualization modes: Scatter (point plot), Bubble (point size proportional to OI), and Heatmap (large colored points with radius 18 for density visualization).
Magnet strike identification: Automatically identifies the strike with the highest combined call + put open interest — the strongest price attractor.
Spot price overlay: Vertical line at current underlying price. Compare spot's position relative to OI clusters to gauge directional pull.
ATM range filter: Narrow the view to strikes within a percentage band around spot, removing far OTM noise.
View options: Show Net and Net Only toggles to switch between combined and net OI views.
Premium themes: Full theme library for chart customization via the THEME_PRESETS system.
Guide Panel: Educational overlay covering OI clustering concepts, chart reading, and trading applications.

How to Read the Chart

Element	Meaning
Large bubbles / bright heatmap areas	Strikes with heavy OI concentration — "magnet" strikes that attract price due to dealer hedging flows.
Small bubbles / faint areas	Low OI strikes — less structural significance for price action.
Spot price line	Current price. If spot is near a large cluster, expect price to gravitate toward and potentially pin at that strike.
Cluster gaps	Strike ranges with sparse OI. Price can move quickly through these zones due to lack of hedging friction.

Heatmap mode tip: In heatmap mode, each strike renders as a large colored circle (radius 18). Bright, warm colors = dense positioning. This mode is best for quickly scanning the full chain to find the 2–3 highest-concentration zones.

Use Cases

Pin risk assessment: Before expiration, identify the highest-OI strike. Price frequently pins at max OI on OPEX day as dealers' hedging activity converges.
Support/resistance mapping: OI clusters act as synthetic support and resistance. Large put OI below spot = support; large call OI above spot = resistance.
Breakout target identification: If price breaks through a low-OI gap between two clusters, it tends to run toward the next high-OI zone.

How to Launch

Open the Window Launcher — click the green + or press L.

Search for OI Clustering or browse Open Interest & Flow.

Click to launch. Enter a ticker symbol.

Data loads via HTTP. Use the chart type selector to switch between Scatter, Bubble, and Heatmap modes.

Data Source & Tier

Data flows through Ohey's HTTP Data Abstraction Layer with per-option OI parsed from the full grid. OI Clustering Heatmap is on the Pro tier ($79/month). View pricing →

Related Windows

PinMap — Identify pin risk levels where OI clusters create price magnets
Delta-Weighted OI — Aggregate OI-based positioning to complement cluster analysis
FlowRate — Directional flow momentum driven by OI changes