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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Vol Screener FAQ & Glossary

Reference · Foundations

Free to read

Vol Screener FAQ & Glossary

Quick answers on VRP, cross-sectional ranking, Term Slope, the three trailing-year columns, and the full vocabulary — each with a picture.

Frequently asked

What does the screener actually do?

It ranks the full Nations universe of 24 symbols by implied-vol richness and cheapness at a single moment in time — cross-sectionally. Every other Nations tool asks "is this name's vol high versus its own history?" The screener asks "which name is richest and which is cheapest across the whole universe right now?" One snapshot, all names ranked.

Cross-sectional rankNVDA — RICHTSLA — richSPY — fairGLD — cheapIEF — CHEAPone moment,all names
What is the VRP column and why is it the most important?

VRP is the Variance Risk Premium: VolDex® 30d minus trailing 30-day realized vol. Positive VRP means implied is above what the name has recently delivered — options are rich, sellers are paid. Negative VRP means implied is below realized — options are cheap relative to what the name is actually doing. VRP normalizes across names: a +10% VRP on NVDA and a +3% VRP on SPY are directly comparable, even though NVDA's absolute vol is far higher. That makes it the primary cross-sectional ranking column.

VRP = implied − realizedrealized volVRP (+)implied > realized→ RICH
What does Term Slope mean and what does backwardation tell me?

Term Slope is VolDex® 7d minus VolDex® 30d. A negative value — 7d below 30d — is contango, the normal resting state: calm near-term, more uncertainty priced further out. A positive value — 7d above 30d — is backwardation, meaning the near-term is more expensive than the longer tenor. Backwardation almost always signals a specific event sitting inside the 7-day window: earnings, an FOMC meeting, a major macro print. Seeing backwardation on a name tells you to check the calendar immediately.

Contango vs backwardationcontango (normal)backwardation(event in window)7d30d90d
What is VolDex® and how is it different from a regular implied-vol reading?

VolDex® is Nations' clean at-the-money implied volatility index. It reads implied vol at the at-the-money point — where put and call premiums are most symmetric — and holds tenor constant at either 7 or 30 calendar days using interpolation between listed expirations. Unlike model-based implied-vol measures that blend the full skew surface, VolDex® is a clean, single point. That makes it directly comparable across names and directly subtractable from realized vol to compute VRP.

VolDex® — the ATM pointOTM put premiumVolDex® (ATM)at-the-money
What is RiskDex® and what does it add to the screener?

RiskDex® is Nations' directional skew ratio — how much the market is paying for downside protection relative to upside at the 30-day tenor. A high RiskDex® means put skew is elevated: the market is bidding for protection against a drop. Cross-sectionally, the name with the highest RiskDex® is where directional fear is most concentrated. When RiskDex® is high alongside a high VRP, the richness includes a skew premium — the put side of any short-premium structure is carrying extra directional risk beyond the absolute-vol mismatch.

RiskDex® — directional skewput skew bidOTM calls (flat)ATM (RiskDex® pivot)
Why do the three 1-year columns show "—" instead of a number?

IV Rank (1y), IV %ile (1y), and VolDex z (1y) require a full trailing year of daily VolDex® readings for each of the 24 symbols. That history pipeline is still being wired into the live page. Rather than display a fabricated or placeholder number, these columns show "—" to be honest about what is and isn't yet computed. The live columns — VRP, VolDex® 30d and 7d, Term Slope, Realized 30d, and RiskDex® — are fully operational. The trailing-year columns will populate when the history connection is complete.

What's live vs pendingVRP — live ✓VolDex® 30d/7d — live ✓RiskDex® — live ✓IV Rank — pendingz-score — pending
What is IV Rank and how is it computed?

IV Rank is (today's VolDex® − 1-year low) ÷ (1-year high − 1-year low) × 100. A reading of 0 means today's implied vol is at the lowest level seen in the past year; 100 means it's at the highest. It's a fast positional read: is today's implied near the top or bottom of its own recent range? The limitation: one brief spike can skew the full-year high and make a moderately elevated reading look low. That's why IV %ile is included alongside it.

IV Rank — position in 1y range1y low (0)1y high (100)today ≈ rank 63
What is the VolDex z-score and why is it useful across names with different vol levels?

The z-score is (today's VolDex® − 1-year mean) ÷ 1-year standard deviation. A z-score of +2 means today's implied is two standard deviations above the 1-year average. The reason it's useful cross-sectionally: it normalizes for vol level. NVDA has a vol level roughly four times IEF's — you can't compare their raw implied numbers. But a z-score of +2 means the same thing for both: each is equally elevated relative to its own normal. Z-score is the apples-to-apples cross-sectional comparison for the time-series dimension.

Z-score normalizes levelmean+2σNVDA z=+2IEF z=+2same z — same signal, different levels
How is cross-sectional RV different from what the Cones tool shows?

The Cones tool ranks one name against its own history — is AAPL vol at the 80th percentile of where AAPL has been? The Screener ranks all names against each other at one moment — is AAPL the richest, cheapest, or middle-of-the-road name in the universe right now? The two questions are complementary, not redundant. A name can be rich cross-sectionally (highest VRP in the universe) but at the median of its own history — or vice versa. The strongest signal is both: cross-sectionally richest and historically elevated at the same time.

Two lenses on richnessConesvs own historyScreenervs universe nowdouble signalrich both ways
What is a vol pair trade and how does the screener help build one?

A vol pair is selling premium on the richest name while buying premium on the cheapest, simultaneously. The position profits from the relative VRP spread converging — the rich name's premium compressing toward normal, the cheap name's premium expanding. It's partially hedged against broad vol moves: if vol spikes everywhere, the short leg loses but the long leg gains. The screener's VRP column identifies both legs in seconds: sort by VRP, take the top and the bottom of the universe.

Vol pair — sell rich, buy cheapNVDASELL premiumIEFBUY premiumconverge → profit
Rich is often rich for a reason — what is the calendar check?

The richest name in the screener's VRP column on any given morning is frequently rich because earnings fall inside the 30-day option window. That is the market doing its job: pricing event premium for a known catalyst. Selling that richness is a valid trade — it is an earnings vol-crush trade — but it is different from selling structural realized-vol mismatch. The Term Slope column is the tell: if the 7-day is much higher than the 30-day (backwardation), the event is in the near-term window. Confirm the earnings date before trading the richest name.

Backwardation = event in windowearnings!7d30d90d
Which symbols are in the universe?

Twenty-four symbols across four categories. Single names (14): AAPL, MSFT, NVDA, AMZN, GOOGL, META, AVGO, TSLA, LLY, JPM, WMT, BRKB, AMD, PLTR. Equity-index ETFs (4): SPY, QQQ, IWM, EEM. Fixed-income ETFs (3): IEF, HYG, TLT. Precious-metal and crypto ETFs (3): GLD, SLV, IBIT.

24-symbol universe14 single names4 equity-index ETFs3 fixed-income ETFs3 metal/crypto ETFs= 24 symbols total
Can the screener tell me which name to trade next?

It tells you the richest and cheapest names at this moment. It does not tell you whether that mispricing will correct this week or persist for months. The screener is a ranking of current conditions, not a forecast of what happens next. Use it to identify the extremes; use the calendar, the other Nations tools, and your own risk framework to decide whether the mispricing is actionable and when. The screener opens the door; the judgment call is yours.

Screener: ranking, not forecastScreener says:"NVDA is richest now"You decide:is it actionable?

Glossary

VolDex®

Nations' clean at-the-money implied volatility index at either the 7-day or 30-day fixed tenor. The implied-vol reading used in all screener columns.

RiskDex®

Nations' directional skew ratio at the 30-day tenor — how much downside protection (put premium) is priced relative to upside (call premium).

Variance Risk Premium (VRP)

VolDex® 30d minus trailing 30-day realized vol. Positive = options are rich (implied above realized). Negative = options are cheap (implied below realized).

Realized vol

Annualized standard deviation of the underlying's daily returns over the trailing 30 days. Scaled by √252. What the name actually delivered.

Term Slope

VolDex® 7d minus VolDex® 30d. Negative = contango (normal). Positive = backwardation (event in near-term window).

Contango

Near-term implied vol lower than longer-dated — the normal resting shape of a vol curve with no imminent catalyst.

Backwardation

Near-term implied vol higher than longer-dated — almost always signals a known event (earnings, FOMC, macro print) sitting inside the 7-day window.

IV Rank (1y)

(Today's VolDex® − 1y low) ÷ (1y high − 1y low) × 100. Position within the past year's range. Currently "—" while history pipeline is wired in.

IV %ile (1y)

Empirical percentile of today's VolDex® reading within the full distribution of daily values over the trailing year. More robust to spikes than IV Rank. Currently "—".

VolDex z (1y)

(Today's VolDex® − 1y mean) ÷ 1y standard deviation. A normalized z-score that is comparable across names with very different vol levels. Currently "—".

Cross-sectional relative value

Comparing implied vol, VRP, and skew across all names in the universe at a single point in time — not a name versus its own history, but versus the full universe right now.

Vol pair

Simultaneously selling premium on the richest name and buying premium on the cheapest — a position that profits from the VRP spread converging rather than from a directional move.

Vol crush

The rapid collapse of implied vol that typically occurs immediately after an earnings announcement, as the event premium priced into options evaporates once the uncertainty resolves.

Do it live

This reference is free. The live screener and its data come with a plan — ETFs with ETF Analytics, single names and commodity ETFs with ETF + Equities, full trailing history with Everything.

See plans →

Educational content from Nations Indexes. VolDex® and RiskDex® are registered marks of Nations Indexes. Diagrams are schematic. Click any diagram to enlarge it. Nothing here is investment advice.

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