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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How to Read the VRP Tool

Variance Risk Premium · Foundations

Free to read

How to Read the VRP Tool

Compare the two vol lines, read the premium, then check its percentile. Three moves.

The tool shows implied versus realized vol, the premium between them, and how rich that premium is versus history. Here's how to work it.

What every control does

Pick the ticker (ETFs on ETF Analytics; single names on ETF + Equities). The VolDex® vs. Realized Vol (30d) chart plots the two volatility series — what was implied and what actually showed up. The VRP summary reduces it to the numbers that matter: current VolDex®, realized vol over the matched 30 days, the resulting VRP, its percentile versus the name's history, and the average VRP for context.

VolDex® minus realized is the VRP; the percentile (here 78th) says it's rich versus this name's own history — generous to sellers.

What to look at first

Three passes. First, the sign of VRP: positive (sellers paid) or negative (realized outran)? Second, the percentile: is the premium rich, average, or thin for this name? That's the number you actually act on. Third, the two lines: is the premium positive because implied is high, or because realized has collapsed? The path matters — a premium that's rich because realized just crashed is a different setup than one that's rich because implied is elevated.

Two common misreads

Misread — "VRP is +4, that's a lot." Versus what? +4 can be thin for one name and rich for another. Read the percentile, not the raw number.

Misread — "Positive VRP means sell vol now." The most recent reading uses a realized window that hasn't fully elapsed — it's provisional. A rich percentile is an edge, not a guarantee; size for the tail.

Do it live

Reading the chart is free. To pull your own: ETFs with ETF Analytics, single stocks with ETF + Equities, full VRP history via Everything.

Your next step

Open the tool → Read: positive, negative & percentile → Read: FAQ & glossary →

Educational content from Nations Indexes. Variance Risk Premium™ and VolDex® are marks of Nations Indexes. The summary figures above are illustrative. Nothing here is investment advice.

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