Fibonacci Retracement
A set of horizontal levels drawn between a swing high and swing low to map where a pullback is likely to pause or reverse — used to time entries within the day's established range.
Fibonacci Retracement is a charting technique that measures a completed price swing and projects horizontal levels at fixed ratios of that move — the standard set being 23.6%, 38.2%, 50%, 61.8%, and 78.6%. After a strong impulse (an open drive, an IB break, or a liquidity-sweep reversal), price rarely travels in a straight line; it retraces a portion of the move before continuing or failing. The retracement levels give traders a pre-defined map of where that pullback is statistically likely to stall.
The ratios come from the Fibonacci sequence, where each number approximates 1.618× the prior one (the "golden ratio"). Markets are not mystically governed by these numbers — the levels work primarily because a large share of participants watch the same 38.2%, 50%, and 61.8% zones and place orders around them, making them self-reinforcing points of interest.
Key levels and how 0DTE traders read them:
- ●23.6% — a shallow retrace; signals strong momentum and little willingness to give back the move (common on Trend Days).
- ●38.2% — the first meaningful pullback zone; a bounce here keeps the impulse intact.
- ●50% — not a true Fibonacci ratio but widely watched; the psychological "give half back" line.
- ●61.8% — the "golden" retracement; a hold here is often the last line before the original move is considered failed.
- ●78.6% — a deep retrace; a break beyond it usually invalidates the continuation thesis entirely.
How SPXXL frames it: Fibonacci Retracement is a manual, discretionary drawing tool on the SPXXL chart, not a classifier output. Draw it from a swing high to a swing low (or vice versa) and the platform plots each level with its price and percentage. Its edge multiplies when the levels line up with SPXXL's engine-derived context — a 61.8% retrace that coincides with VWAP, a Price Magnet, the prior-session Close Zone™, or an IB boundary is a far more compelling area of interest than a Fib level sitting in open space. On rotational regimes (Balanced Day, Volatility Compression) retracements tend to respect the levels cleanly; on Trend Days and Expansion Days, expect shallow 23.6–38.2% pullbacks and treat deep retracements as a warning that the trend may be breaking.
How to use it on the chart: select the Fibonacci tool from the drawing toolbar (keyboard shortcut F), then click the swing origin and the swing end. Combine it with the alert-line tool to get notified when price reaches a level, and with the rectangle tool to mark the zone between two Fibs as a decision area.
Important: Fibonacci Retracement is decision support and education, never a signal or financial advice. The levels describe where attention may cluster — they do not predict that price will reverse. Markets remain uncertain, a level that held yesterday can slice through today, and 0DTE options carry a substantial and rapid risk of total loss. Always confirm the live regime and price action, and define your invalidation before entering.
Related Terms
The tendency of SPX to rotate back toward its VWAP / fair value after stretching away from it. SPXXL scores this 0–100 as an independent measure — high readings favor fade structures like iron condors, low readings favor letting a trend run.
Intraday price levels that repeatedly attract SPX — the market keeps returning to and oscillating around them. SPXXL scores each level by how often price touches it and round-trips through it.
The price range established during the first 30 minutes of trading (9:30-10:00 AM ET) — a key reference for the entire session.
The options-implied price range SPX is expected to stay within by the close — derived from ATM implied volatility using the 1-standard-deviation (68%) probability envelope.
A directional breakout strategy that enters when price breaks above or below the Initial Balance — SPXXL uses the 60-minute IB timeframe for institutional-grade confirmation.
SPXXL's proprietary projected closing price range for SPX, computed using session classification, gamma exposure, and intraday momentum.