Positive or negative, and where it flips.
Net gamma across the 0DTE chain, the recorded flip, zero gamma and the call and put walls, updated through the session.
Gamma by strike sits beside the chart, so you see the walls form.
New HAB Regime Monitor 1.0 for Windows
Know the SPX 0DTE gamma regime as it shifts.
Gamma regime, call and put walls, zero gamma and the prior day's levels with calibrated odds. Live on your own PC, from your own market data.
One-time licence. No subscription. Check the requirements before you buy.
1,198SPX sessions in the odds back-test
0.175Out-of-sample Brier score
100% localYour key and data stay on your PC
$200Once. No monthly fee
Model calibration (the odds model the Monitor runs): Brier 0.175 out of sample (0.171 in sample; 0.250 is the no-skill baseline).
Inside the Monitor
The structure behind the tape, on one screen.
Built for SPX 0DTE traders who want to see positioning and levels without stitching sources together.
Gamma regime
Key levels
Every prior-day level, with its odds.
Prior high, low and close each get a chance of being reached, set at the 9:30 open and never changed. When a level is hit, the time replaces the odds.
18 Sep: the prior-day low had 22% at the open. Reached at 12:25.
Calibration
Odds you can check.
The odds model is back-tested on 1,198 SPX sessions, December 2021 to September 2026. When it said 20–30%, the level was reached 30.2% of the time.
The table shows the blended-volatility model (Brier 0.169; 0.173 out of sample). The Monitor runs a range-volatility variant of the same model (0.171; 0.175 out of sample); the two are within noise of each other over 1,198 sessions. 0.250 is the score of a constant 50% forecast; always forecasting the historical hit rate would score 0.250. This measures forecast calibration, not trading returns. Past calibration does not guarantee future accuracy.
Back-tested on market data, December 2021 to September 2026, 1,198 sessions.
How it works
Three steps to a running Monitor.
01
Install one file
A single Windows installer.
Windows 10 or 11 (64-bit). The installer brings everything else it needs, including its own Python.
02
Connect your data
Paste your API key and secret on the setup screen.
Install the Webull OpenAPI Python package with one click on the setup screen (Step 2); the key guide in the download also gives the exact command.
03
Watch the session
The computer on during the trading day (09:20 ET to 20 minutes after the close).
Replay of any session it has collected. Every step is in the setup guide.
Pricing
Pay once. Keep it.
No subscription, no account with us. You bring your own market data under your own agreement with your data provider.
Requirements- Windows 10 or 11 (64-bit).
- Requires a Webull account with API access. Apply for and get API approval from Webull before you buy.
- Using a different data provider? Email [email protected]. Support for other providers may be added in a future version.
- A real-time options data subscription on that account.
- Your own API key stays on your computer; we never see it.
Not offered or sold to New Jersey residents.
HAB Regime Monitor
Windows$200 per licence, plus applicable sales tax
- One licence, one Windows 10 or 11 machine
- Live view, key levels with odds, session replay
- Updates for 12 months, if released
- Setup guide and email support
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Buy HAB Regime Monitor
Tick both boxes to enable Buy.
All sales are final once the download link is delivered, except where the law requires otherwise. If we issue a refund, it is the price less the payment processor's fee; any sales tax is refunded in full. Check the requirements above before you buy.
Free · every trading day
The HAB Report daily brief
An SPX 0DTE brief before the open, then a public grade after the close. Right or wrong, every one is scored in the open.
Questions
- Does it tell me what to trade?
- No. It shows market data and statistical estimates, never a recommendation. It cannot place, cancel or read an order, and it cannot see your account.
- What do I need?
- A Windows PC, a market-data account with API access, and a real-time options data subscription on that account. The exact requirements are listed beside the price.
- Does my data leave my computer?
- No. Your key and everything it collects stay on your PC. No licence check, no update check, no telemetry.
- What about refunds?
- All sales are final, except where the law requires otherwise. The refund terms are beside the Buy button and in Section 10.3 of the License Agreement. If a download fails, a working copy is re-sent.