Engine Edge
SPXXL's composite accuracy score measuring classification quality, structure recommendations, and calibration across confidence levels.
Engine Edge is SPXXL's headline performance metric — a single score (0-100) that quantifies how well the classification engine performs across all dimensions.
Engine Edge combines three components:
- ●Classification Edge: Accuracy of session type predictions weighted by confidence
- ●Structure Edge: How often the recommended option structure would have been profitable
- ●Calibration: Whether high-confidence calls are actually more accurate than low-confidence ones
Ratings:
- ●ELITE (85+): Exceptional — engine is outperforming in all dimensions
- ●STRONG (70-84): Reliable — strong classification accuracy with good calibration
- ●SOLID (55-69): Functional — useful for directional bias but less precise
- ●DEVELOPING (40-54): Building — not yet sufficient for high-conviction trades
- ●WEAK (<40): Recalibrating — engine accuracy below useful threshold
Engine Edge is updated daily at 4:05 PM ET after each session is graded. The metric uses a rolling window that weights recent sessions more heavily. Traders can view the full Engine Edge breakdown on the Track Record page.
For 0DTE traders, Engine Edge answers the critical question: "Should I trust today's classification?" When the Engine Edge is ELITE or STRONG, the classification has demonstrated reliable predictive power.
Related Terms
SPXXL's proprietary projected closing price range for SPX, computed using session classification, gamma exposure, and intraday momentum.
SPXXL's public database of every classified trading session — a searchable, transparent record of engine accuracy across 297+ trading days.
SPXXL's public accuracy dashboard showing win rate, streak data, and Engine Edge score — graded daily at 4:05 PM ET.