Note. This content is published in an educational and statistical framework. It does not constitute investment advice under AMF / MiFID II regulations. Past performance does not guarantee future results.
What is the VIX?
The VIX (Volatility Index), often called the “fear index”, measures 30-day implied volatility of options on the S&P 500. It reflects investor expectations about future market fluctuations.
When the VIX is high, investors expect large moves and pay more for protection. It is a standard market indicator integrated into the LIX via proprietary ONELIX normalization.
ONELIX publishes the reading logic and historical statistics of the signal, but not the full proprietary transformation. This guide stays aligned with the interactive analysis level.
Economic logic
The VIX is computed from put and call option prices on the S&P 500. When investors fear a decline, they buy protection (puts) in large volumes, pushing option prices — and the VIX — higher. In calm periods, protection demand is low and the VIX falls.
The VIX paradox
The VIX is often a contrarian indicator: a very low VIX at a market peak signals dangerous complacency that often precedes corrections. Conversely, a very high VIX usually marks a capitulation point. At the market top, a low ONELIX score does not mean absence of risk — it often reflects protection priced too cheaply.
Raw implied volatility is normalized on an intuitive scale. Intermediate steps remain proprietary.
The VIX reads short-term sentiment and the price of protection. It is neither a standalone timing tool, nor a valuation or credit signal.
How the signal is built
ONELIX relies on the VIX published by the CBOE (Chicago Board Options Exchange), available via FRED (VIXCLS) since January 1990.
The VIX represents expected implied volatility over the next 30 days. ONELIX uses the monthly median VIX — the median of all daily values in the month — for better representativeness of fear across the month and comparability with other monthly LIX indicators.
Unlike other indicators, the VIX uses rolling statistics: mean and standard deviation are recalculated at each point using all historical data available up to that date. This captures how market behavior evolves over time.
On this basis, ONELIX computes a normalized score from 0 to 100% using a proprietary formula, integrated into the LIX.
The exact normalization formula and certain robustness parameters are not published. The goal is to preserve analytical value while keeping the reading accessible.
Historical reading
The chart below presents the VIX series (monthly median) through year-end 2025.
VIX — implied volatility of the S&P 500
Monthly values, January 1990 → December 2025
Sources: CBOE VIX, proprietary ONELIX calculation. Red bands: 15 major corrections tracked in ONELIX.
Notable historical peaks
- 2008 (Lehman): VIX at 89.5, followed by a massive market rebound
- 2020 (COVID): VIX at 82.7, capitulation point before recovery
- 1987 (Black Monday): estimated peak above 150 (before official VIX creation in 1993)
VIX spikes appear during sharp stress phases. Very low VIX periods at market peaks tend to signal complacency rather than a risk-free environment.
The ONELIX reading of the VIX
ONELIX reads the VIX as a volatility and sentiment signal at short horizon. It complements credit (Junk Spreads), valuation, leverage (Margin Debt) and cross-asset volatility (Gold Volatility, Big Cap Volatility).
The normalized score transforms implied volatility into an intuitive scale: 0% corresponds to extreme calm, 100% to historical panic. A low score at the market top is often more informative than a high one — the core of the contrarian reading.
Across 9 major corrections (≥19%) with VIX data since 1990, the signal showed a frank detection (≥75%) in 0% of cases at the peak — expected for a contrarian indicator measured at the top. Affected crashes include 1990, 1998, 2000, 2008, 2011, 2018, 2020, 2022 and 2025, where normalized VIX was low (<60%) at the peak, reflecting prior complacency.
The signal becomes more robust when it converges with tight credit, extreme valuation or high leverage.
A high score means implied volatility sits in a historically stretched zone.
Product preview. Frozen historical capture.
In the LIX composite score, the VIX belongs to the Volatility, Sentiment & market structure family. The ONELIX methodology details the normalization.
Limits and vigilance points
The VIX is an excellent market sentiment indicator, but it has important nuances.
- Imprecise timing: a low VIX can persist for months before a correction
- Sudden spikes: the VIX can explode within hours on a shock
- Rapid mean reversion: the VIX often quickly returns toward its historical average (15–20)
- Complementary: it does not directly measure valuation, credit or the macro cycle
A low VIX does not guarantee a safe market; a high VIX does not provide a correction date.
Explore the VIX in ONELIX
Interactive charts, drawdown statistics, historical zones and dedicated backtest.
Frequently asked questions
What does the VIX measure?
30-day implied volatility of S&P 500 options, synthesized into an ONELIX score of 0–100% via the monthly median.
How does it differ from Gold Volatility?
The VIX reads short-term equity implied volatility; Gold Volatility reads cross-asset stress via a safe-haven asset.
What are the data sources?
CBOE VIX (FRED VIXCLS), monthly median, proprietary ONELIX normalization.
Why is the VIX low at market peaks?
The VIX is contrarian: a low reading at the top often reflects complacency, not the absence of risk.
Does it predict crashes?
No. It informs on sentiment and the price of protection, without providing a market calendar.
Can it be used alone?
No. It must be cross-checked with credit, valuation, leverage and cross-asset volatility.