The 0DTE Decision
Engine for SPX.
70% of 0DTE losses come from deploying the wrong structure for the day type. You sold iron condors on a Trend Day. You bought directional on a Balanced Day.
SPXXL classifies the current SPX session in real time, scores it across 7 dimensions, and tells you exactly which options structure fits — before you place the trade.
6 Session Archetypes
Balanced, Trend, Expansion, Short Covering, Liquidity Sweep, Compression — each scored 0-100 with confidence %
Dual-Panel Chart Engine
Lower panel classifies the regime. Upper panel maps price levels, IB, ADR expansions, and sweep signals — all in your browser.
Web-Native Platform
No software to install. Log in and see every overlay — VWAP, IB extensions, ADR levels, MFE targets, sweep arrows — all on one interactive chart.
Wrong Structure. Wrong Day. Every Time.
Most 0DTE traders deploy the same strategy regardless of what the market is doing. The session type changes — but their structure doesn't.
Without SPXXL
You sold iron condors — market trends all day — max loss
You bought directional — market stays balanced — theta eats you alive
You catch a liquidity sweep — panic exit — price reverses without you
You size up on an expansion — it was compression — range stays tight
You trade every day the same way — some days profit, most don't
With SPXXL
Dashboard reads "Trend Day, 87% confidence" — you deploy debit spreads
"Balanced Day" classification — you sell premium with condors
Liquidity Sweep detected — you wait for the reversal, deploy mean reversion
"Compression" flagged — you sell theta or set breakout alerts
Every day, the structure matches the regime — consistency compounds
SPX Isn't Just Another Ticker.
It's a Structural Advantage.
Most traders default to SPY because it's familiar. But for 0DTE options, SPX offers tax benefits, cash settlement, and liquidity that SPY simply can't match.
Cash Settled
No assignment risk. No shares to manage. SPX options settle to cash at expiration — clean, simple, and efficient.
60/40 Tax Treatment
Under Section 1256, SPX gains are taxed 60% long-term / 40% short-term regardless of holding period. That's a structural advantage over SPY.
Massive Liquidity
SPX 0DTE options see millions of contracts daily. Tight bid-ask spreads mean better fills and lower slippage on entries and exits.
No PDT Restriction
As of June 4, 2026, the Pattern Day Trading rule is eliminated. Trade 0DTE SPX freely — no $25K minimum, no trade count limits.
0DTE Is Exploding
0DTE options now represent over 50% of all SPX volume. This is the fastest-growing segment in options. The edge belongs to those who classify the session first.
European-Style
SPX options can only be exercised at expiration — no early exercise risk. You control the position until the final bell.
Built on the Implied Order Book
SPXXL's classification engine is built on the same institutional framework that powers dealer hedging desks — gamma exposure, vanna sensitivity, and the implied order book. We translate these mechanics into real-time session types so you always know the liquidity regime before placing your 0DTE trade.
Gamma Exposure (GEX)
Measures how much liquidity dealers supply or withdraw at each price level. Positive GEX = tight ranges, negative GEX = explosive moves.
Vanna Sensitivity (VEX)
Tracks how changes in implied volatility force dealers to buy or sell shares. VEX drives the sweeps and squeezes that trap directional traders.
Liquidity Regime
Real-time classification of the current environment — HIGH, NORMAL, or LOW liquidity — so you know the rules before placing a trade.
7-Dimension Scoring
Six session archetypes plus a dedicated Liquidity Score that proxies institutional gamma/vanna exposure using VIX, range compression, and VWAP adherence.
Session Type → Structure. Every Time.
SPXXL doesn't just classify the session — it maps each archetype to a specific 0DTE options structure so you know exactly what to deploy before the trade.
Balanced Day
Iron Condor / Iron Butterfly
Range-bound regime. Sell premium on both sides. Price oscillates around VWAP — theta works in your favor.
Trend Day
Vertical Debit Spread
Strong directional conviction. Buy the trend with defined risk. IB breaks confirm direction early.
Expansion Day
Wide Put/Call Spread or Backratio
Explosive move expected. Use ADR extensions as targets. Size down — the range is 2×+ normal.
Short Covering Rally
Call Debit Spread / Put Credit Spread
Forced buying into weakness. Look for VWAP reclaim + IB break up. The squeeze gives you the edge.
Liquidity Sweep
Mean Reversion Spread (after sweep)
Price hunts stops, then reverses. Wait for the sweep signal, then deploy a reversion structure at the extreme.
Compression
Tight Butterfly / Calendar Spread
Volatility is contracting. Sell premium tight, or use calendars to profit from the eventual expansion.
Everything You Need. Nothing You Don't.
One SPXXL subscription gives you the web dashboard, the interactive chart engine, and the complete technical reference — a unified system purpose-built for SPX 0DTE structure selection.
SPXXL Web Dashboard
Real-time SPX session classification, confidence scoring, histogram engine, IB/ADR analysis, VWAP bias, and excursion metrics — accessible from any browser.
Live 30-second auto-refreshSPXXL Interactive Web Chart
A dual-panel charting engine — upper price chart with IB, ADR, VWAP, sweep arrows, and MFE/MAE targets. Lower histogram shows session classification in real time. All toggleable.
No software install neededTechnical Reference Guide
A comprehensive 10-chapter reference covering all 6 session archetypes, the 7-dimension scoring engine, the dual-panel overlay system, the 5-step decision flow, and a scenario playbook.
PDF — included with all paid plans7-Dimension Scoring Engine
Price, Time, Volume, Value, Momentum, Volatility, and Liquidity — each session type is scored across all dimensions with transparent, auditable percentage-based scores (0-100).
Not a black boxExcursion & IB Analytics
Initial Balance tracking with 1.5× and 2× extensions. Dynamic ADR expansion levels (25/50/75/100/125%). MFE/MAE excursion targets. Expansion ratio and relative volume.
Institutional-grade levelsSession History & Transitions
Full session timeline showing every classification throughout the day. Session transition markers fire only on state changes. Histogram visualizes regime shifts in real time.
State-change detection6 Session Archetypes
Each session type maps to specific options structures and risk profiles
Balanced Day
Market auctions within ADR. High VWAP proximity, low expansion ratio (<0.8), normal relative volume (0.7–1.3). Excursion symmetry confirms rotational price action.
VWAP proximity 30% + ADR check 25% + vol check 20% + net move 15% + symmetry 10%
Trend Day
Sustained directional move confirmed by VWAP bias, bull/bear trend persistence (3-bar), and excursion asymmetry. Expansion ratio 0.8–1.5 with volume >1.0.
Directional strength 25% + expansion 20% + asymmetry 20% + volume 15% + net move 20%
Expansion Day
Range exceeds 1.5× ADR. Relative volume >1.5 confirms institutional participation. Strong directional strength with net move >0.5%.
Expansion ratio 35% + relative volume 25% + net move 20% + directional 20%
Short Covering
Bullish VWAP bias + positive net move + volume >1.3. Open-to-high exceeds 2× open-to-low. Lower wick ratio <15% confirms trapped shorts exiting.
Bias 20% + volume confirm 20% + excursion skew 25% + net move 15% + wick check 20%
Liquidity Sweep
Upper/lower wick ratios >35% of daily range. Body ratio <30%. Large wicks probing liquidity pools above/below, then reversing. State-change detection marks first sweep only.
Upper wick 25% + lower wick 25% + body ratio 20% + volume 15% + VWAP proximity 15%
Volatility Compression
Expansion ratio <0.5 (or <0.7). ATR/ADR ratio <0.7 confirms multi-bar compression. Low relative volume (<0.8) and minimal net move (<0.15%). Breakout imminent.
Expansion ratio 35% + ATR vs ADR 25% + volume 20% + net move 20%
7-Dimension Scoring Engine
Each session type is scored 0-100 across seven independent dimensions. No black box. Every SPXXL score is transparent, auditable, and mirrors the TOS study logic exactly.
Confidence = (Max Score / Total Score) × 100 — tells you how dominant the winning classification is
Two Studies. One Complete Picture.
The lower panel classifies the market regime. The upper panel maps price levels, targets, and signals. Together, they form the SPXXL decision framework for SPX 0DTE structure selection.
Session Classification Engine
Lower Panel · Session Histogram
6 Session Archetypes
Balanced, Trend, Expansion, Short Covering, Liquidity Sweep, Compression — each scored 0-100
Confidence Scoring
Percentage dominance of winning session type tells you how clean the read is
Structure Mapping
Every regime maps to optimal 0DTE structures — condors, spreads, reversals, premium selling
Risk Level Assessment
Extreme Volatility, High Volume Alert, Breakout Pending, or Moderate — in real time
State-Change Detection
Signals fire only on the FIRST bar of a new event — no spam, no noise, only transitions
Tiered Label Hierarchy
Tier 1 always visible, Tier 2 toggleable metrics, Tier 3 debug scores — you control density
Price Study Overlay
Upper Panel · Price Overlay
Dynamic ADR Expansion Levels
25%, 50%, 75%, 100%, 125% of ADR — levels that adapt to volatility automatically
Initial Balance System
IB High/Low/Mid with 1.5× and 2× extension targets — institutional breakout levels
VWAP Bias Coloring
VWAP line turns green above / red below — instant directional bias at a glance
Liquidity Sweep Arrows
State-transition detection marks the FIRST sweep on price — no repeated signals
MFE/MAE Excursion Targets
Historical average excursion levels show where price TYPICALLY reaches from the open
IB Break Detection
Cyan arrows mark the first candle breaking the Initial Balance — trade the expansion
5-Step Decision Flow
Classify
Lower panel identifies the dominant session type
Confirm
Check confidence score — is the read clean or mixed?
Locate
Upper panel shows IB, VWAP, and ADR expansion levels
Structure
Map session type → optimal 0DTE options structure
Execute
Use MFE/MAE targets for entries, stops, and profit levels
6
Session Archetypes
7
Scoring Dimensions
30s
Live Refresh
2
Chart Panels
Traders Who Stopped Guessing
Hear from real traders who use SPXXL to classify the session before placing a trade.
I was guessing at structure selection every morning — condors when I should have been doing spreads. SPXXL tells me the session type within the first 30 minutes. My win rate on 0DTE went from 42% to 68% in two months.
Michael T.
0DTE SPX Trader · 3 years
The dual-panel chart is phenomenal. Lower histogram tells me the regime, upper chart gives me the levels. I finally stopped fighting trend days with iron condors. The scoring engine is the edge I didn't know I needed.
Sarah K.
Full-time Options Trader
After the PDT rule change, I needed a system to keep me disciplined. SPXXL's session classification replaced my gut feeling with data. The confidence score alone saves me from low-probability setups.
David R.
Swing & 0DTE Trader
Built by active SPX traders. Designed around the real session dynamics of 0DTE.
Get the Daily SPX
Session Summary
Every trading day after market close, receive a free email with today’s session classification, confidence scores, and what the optimal structure would have been. No account required.
No spam. Unsubscribe anytime. Emails sent Mon–Fri after 4:05 PM ET.
Transparent Pricing
Start with a free trial. Upgrade when ready.
FREE Trial
- Full session classification engine
- SPX live data — 5-day trial
- All 6 session archetypes with scoring
- Confidence scoring & structure recommendations
- 0DTE Theta Decay analysis
- 0DTE Strategy Builder with all presets
SPXXL PRO
- Real-time SPX session classification
- 7-dimension scoring engine (0-100)
- Structure recommendations per regime
- IB system with 1.5× / 2× extensions
- Dynamic ADR expansion levels
- VWAP bias & excursion metrics
- Session history & transition markers
- SPXXL Web Chart — session histogram
- Technical Reference Guide (PDF)