One-Way Market Index
A proprietary composite indicator that measures the probability of a sustained one-directional market trend — built from 7 technical signals across price, momentum, volatility, and sentiment.
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Fear & Greed Index
Extreme FearData reflects latest available trading day. Not financial advice.
What is the One-Way Market Index?
Most market indicators answer the question "which direction?" — but the One-Way Market Index answers a different question: "how strongly is the market committed to that direction?"
Financial markets spend roughly 70% of their time in ranging, choppy conditions where trend-following strategies consistently lose money. The remaining 30% — the trending periods — is where the majority of market returns are captured.
The One-Way Index was designed to identify those trending windows with high confidence, by requiring multiple independent technical signals to simultaneously confirm directional conviction.
Unlike the Fear & Greed Index, which measures investor sentiment, the One-Way Index measures structural trend quality — whether the price action itself is exhibiting the characteristics of a true one-directional move.
A market can be in "Extreme Greed" sentiment while still being choppy and range-bound. Conversely, a strong downtrend can persist even as sentiment recovers. The One-Way Index captures the technical reality of what the market is actually doing, independent of emotional state.
The index is calculated daily using S&P 500 historical price and volume data, combined with the CBOE Volatility Index (VIX) and CNN Fear & Greed data.
How to Read the Score
No Trend
The market is in consolidation or chop. No clear directional bias. Wait for a breakout signal before taking trend-following positions.
Weak Directional Bias
A mild lean exists but the trend is not yet confirmed. Early-stage moves often score here before momentum builds.
Moderate Trend
A confirmed trend is underway. Most trend-following strategies perform well in this zone.
Strong One-Way Trend
Strong sustained directional movement. Multiple technical indicators align. High-conviction trend-following conditions.
Extreme One-Way
Rare, powerful trending conditions — like a post-earnings breakout or macro shock. These periods are highly profitable for trend traders but can reverse sharply.
The 7 Components
Each component is scored 0–100 and weighted by its contribution to trend identification. The composite score is a weighted sum.
ADX (Trend Strength)
25% weightAverage Directional Index — measures how strong a trend is, regardless of direction. ADX above 25 signals a trending market; below 20 indicates consolidation.
MA Alignment
20% weightMeasures how well the 8, 21, 50, and 200-period EMAs are stacked in bullish or bearish order. Perfect alignment (all EMAs in sequence) scores 100.
RSI Trend Zone
15% weightRSI in the 55–65 range during a bull trend signals momentum without exhaustion. Extremes above 80 or below 20 actually reduce the score — they signal potential reversal, not continuation.
Bollinger Band Width
15% weightMeasures volatility expansion from a recent squeeze. Markets that break out of a low-volatility period into expanding Bollinger Bands score highest.
VIX (Volatility Index)
10% weightIn a bull context, low VIX (12–16) means calm confidence — ideal for one-way uptrends. In a bear context, high VIX (>30) confirms panic-driven one-directional selling.
Volume Conviction
10% weightCompares 20-day average volume to 50-day average. Rising volume confirms that market participants are increasingly committed to the trend direction.
Fear & Greed Calibration
5% weightA small weighting that aligns sentiment with price action. Extreme Greed during a bull trend or Extreme Fear during a bear trend adds directional confirmation.
Methodology
Data Sources
- • S&P 500 (^GSPC) — price, high, low, volume (365-day history)
- • CBOE VIX (^VIX) — current volatility reading
- • CNN Fear & Greed Index — live sentiment score
Update Schedule
Calculated once daily at 8:00 AM KST (23:00 UTC) using the previous trading day's closing data. Distributed as part of the FinBrief morning briefing.
Direction Determination
Market direction (bull/bear) is determined by combining ADX +DI/-DI differential with EMA stack alignment. When ADX exceeds 25, the +DI/-DI comparison takes precedence. In weaker trend conditions, EMA alignment determines direction.
Disclaimer
The One-Way Market Index is a technical analysis tool for informational purposes only. It does not constitute financial advice. Past index readings do not guarantee future market performance.
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Frequently Asked Questions
What does the One-Way Market Index measure?
The One-Way Market Index measures the probability that the market is in a sustained, one-directional trend — as opposed to choppy, sideways movement. A score of 0 means no trend; a score of 100 means maximum directional conviction across all measured indicators.
How is the One-Way Index different from the Fear & Greed Index?
The Fear & Greed Index measures market sentiment — how emotionally driven investors are. The One-Way Index measures trend structure — whether the market is technically trending in a single direction. They complement each other: Fear & Greed tells you the mood; the One-Way Index tells you the direction and conviction.
What does a score above 80 mean?
A score above 80 indicates "Extreme One-Way" conditions — rare periods where nearly all technical indicators simultaneously point in the same direction. These can be exceptional opportunities for trend traders, but also carry elevated reversal risk once the extreme conditions unwind.
Which market does the One-Way Index track?
The One-Way Index is calculated using S&P 500 (^GSPC) price and volume data, combined with VIX (^VIX) readings. While it reflects US equity market conditions, the composite nature of the index captures macro trend dynamics relevant to global markets.
How often is the index updated?
The One-Way Index is updated once daily as part of the FinBrief morning briefing pipeline. The score reflects the most recent full trading day's closing data.
Can the One-Way Index be used as a trading signal?
The One-Way Index is an analytical tool, not a trading signal. It describes current market conditions rather than predicting future price movements. FinBrief's analysis is for informational purposes only and does not constitute financial advice.