Our Indexes

The world's leading
independent volatility indexes.

Five precision-engineered indexes that strip away the distortions of legacy vol measures — giving you a clean, real-time read on what options are actually pricing.

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VolDex®

A better way to measure option volatility

VolDex® focuses on the options that matter most—at-the-money (ATM) options with near-term expirations—giving a cleaner, more accurate view of implied volatility.

By isolating these highly liquid and actively traded contracts, VolDex avoids the distortion caused by less relevant, far out-of-the-money options. The result is a more precise snapshot of market expectations for price movement and investor sentiment—without the noise.

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CallDex®

A clearer signal of bullish sentiment & expected volatility

CallDex® tracks the cost of out-of-the-money call options to gauge market sentiment for the next 30 days. It uses call options that are one standard deviation out-of-the-money to measure what investors are expecting in terms of both volatility and potential price direction.

Higher CallDex values generally suggest traders are anticipating bigger moves or a possible market rally. Lower values indicate a calmer outlook or reduced interest in upside exposure.

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PutDex®

Focused on downside risk pricing

PutDex® delivers a clear, strike-specific measure of implied volatility by concentrating on one key data point: the normalized cost of a 30-day, one standard deviation out-of-the-money (OTM) SPY put option.

This approach isolates the segment of the options market most directly associated with downside protection, removing the noise from less relevant strike prices. The result precisely indicates market sentiment around tail risk, hedging activity, and bearish positioning.

By zeroing in on these put options—widely used by institutional investors to protect against market declines—PutDex offers valuable insight into how much investors are willing to pay to insure against losses over the next month.

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RiskDex®

A Clear Signal of Expected Market Direction

RiskDex® measures investor sentiment by comparing the normalized cost of 30-day, one standard deviation out-of-the-money (OTM) SPY put and call options. This simple ratio reveals whether the market is more focused on downside protection or upside opportunity — offering a direct view of expected equity direction over the next month.

Unlike traditional volatility indexes, which reflect overall price movement, RiskDex highlights directional bias. A rising RiskDex indicates OTM put prices are increasing at a faster rate than OTM call prices and suggests growing concerns about potential declines; a lower reading signals confidence or complacency.

This makes RiskDex a valuable tool for traders and risk managers seeking clarity on where the market thinks it's headed—not just how volatile it might be.

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TailDex®

A smarter signal for downside risk & tail hedging demand

TailDex® measures the price of deep out-of-the-money put options to assess bearish sentiment and demand for tail risk protection over the next 30 days. By focusing on puts that are three standard deviations OTM, it reflects how concerned traders are about a major downside move, often called a 'tail event'.

Higher TailDex values suggest rising demand for crash protection or increased fear of large selloffs. Lower values imply a calmer market tone and less urgency to hedge against tail risk.

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When Options and Price Agree — and When They Don’t

Trading Signals · Intermediate

Free to read

When Options and Price Agree — and When They Don’t

The most useful moments are not when everything agrees, but when the options read and the price read pull apart.

Confluence is conviction

When a bullish price trend is backed by falling downside demand (a falling RiskDex) and benign tail pricing, the two lenses agree and conviction is high. Confluence is the easy case — act with normal size.

Divergence is the signal

When price grinds higher but PutDex or TailDex is quietly climbing, the options market is hedging into the rally. That divergence is a caution flag — and sometimes an opportunity to fade or to hedge cheaply before the crowd reacts.

Let the disagreement set the trade

Rather than ignore a split read, use it: tighten risk, prefer defined-risk structures, or wait for the two lenses to re-align. A divergence resolved is often a cleaner entry than a signal that was obvious all along.

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Educational content from Nations Indexes. Trading signals are informational and are not investment advice or a recommendation to buy or sell any security.

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