Reading the Nations Indexes
The options market is constantly pricing a forecast — how far a stock or ETF is likely to move, in which direction the fear is concentrated, and how much investors will pay to protect against a crash. The trouble is that this forecast is buried inside thousands of individual option prices. The Nations family exists to pull it back out. Each index isolates one precisely-defined slice of what options are pricing, so instead of squinting at an option chain you can read a handful of clean, comparable numbers.
This page is the map. It walks through all six indexes in the order a trader actually reads them — the overall level first, then the shape of demand, then the tails and the curve — with what each one measures, how to read a high or low value, and the mistake beginners most often make. You can read every index here for free; watching them update live is what a subscription adds.
The six readings, in order
VolDex® — the cleanest read on implied volatility
VolDex® is the implied volatility of the at-the-money option at a constant 30-day horizon. At-the-money options carry no directional bias and no intrinsic value, so their price is the purest available reflection of how much movement the market expects. That makes VolDex® the flagship: one number for “how nervous is the options market right now,” directly comparable across time and across underlyings.
Reading it: a rising VolDex® means options are getting more expensive — the market is bracing for bigger moves. A low, falling VolDex® means the market expects calm. Because it is pinned to a constant 30-day, at-the-money point, today’s VolDex® is comparable to last month’s in a way a raw option quote never is.
CallDex® — what the market pays for upside
CallDex® measures the normalized cost of a 1-standard-deviation out-of-the-money call at 30 days. It answers a narrower question than VolDex®: how much are investors paying specifically to own upside? When a name is being chased — a squeeze, a melt-up, heavy call buying — CallDex® lifts.
Reading it: a high CallDex® says upside is in demand and expensive; a low one says the market is indifferent to further gains. On its own it is a sentiment gauge; its real power comes from comparing it to its downside twin.
PutDex® — the price of protection
PutDex® is the mirror image: the normalized cost of a 1-standard-deviation out-of-the-money put at 30 days. Puts are insurance, so PutDex® is a direct read on how much the market is paying to hedge downside. In equity indexes it is almost always richer than CallDex®, because investors fear crashes more than they fear rallies.
Reading it: a spiking PutDex® means demand for protection is surging — often before or during a sell-off. A sagging PutDex® means hedges are cheap and complacency may be creeping in.
RiskDex® — directional skew as a single ratio
RiskDex® is simply the ratio of PutDex® to CallDex®. It collapses the whole put-versus-call demand picture into one number: how much more expensive is downside than upside right now? This is the classic “skew,” expressed so you can track it over time and compare it across names.
Reading it: a high RiskDex® means puts are richly bid relative to calls — fear is dominant. A low RiskDex® (toward or below 1) means the usual downside premium has compressed, which can itself be a contrarian signal. Because it is a ratio, it strips out the overall level of volatility and leaves you with pure directional lean.
TailDex® — the price of crash protection
TailDex® measures the normalized price of a 3-standard-deviation out-of-the-money put, and it is published at the 30-day horizon only. Where PutDex® tracks ordinary hedging demand, TailDex® reaches far into the left tail — the strikes that only pay off in a genuine crash. It is the market’s live quote on black-swan risk.
Reading it: an elevated TailDex® means the market is paying up for disaster insurance, even if the broader VolDex® looks calm — a divergence worth respecting. A depressed TailDex® means crash protection is being given away cheaply, which is often when it is most worth owning.
TermDex® — the shape of the term structure
Every index above is a 30-day snapshot, but implied volatility exists at every expiration. TermDex® compresses the shape of the VolDex® term structure into a single number — the slope from near-dated to far-dated volatility — read against each asset’s own history rather than a fixed threshold.
Reading it: a normal upward slope (contango) reflects a calm market that expects today’s conditions to persist near-term. A flat or inverted slope — near-dated volatility jumping above far-dated — is a warning that the market expects turbulence soon. TermDex® lets you track that regime shift as one moving line instead of eyeballing a curve.
Putting them together: the daily picture
No single index tells the whole story; the edge is in reading them as a set. A calm tape with a quietly rising RiskDex® and TailDex® is very different from a calm tape where every reading is asleep — the first is a market buying protection under the surface. The table below is the quick-reference for what a high value in each index is telling you.
| Index | Measures | A high reading means |
|---|---|---|
| VolDex® | ATM implied vol (30-day) | Market expects bigger moves |
| CallDex® | 1-SD OTM call cost | Upside is in demand |
| PutDex® | 1-SD OTM put cost | Hedging demand is surging |
| RiskDex® | PutDex® ÷ CallDex® | Downside fear dominates |
| TailDex® | 3-SD OTM put cost (30-day) | Crash protection is bid up |
| TermDex® | VolDex® curve slope | Curve calm (contango); low/inverted warns of near-term stress |
A worked example
Suppose an ETF is grinding higher and VolDex® is drifting down — the classic “quiet market.” But over the same week PutDex® ticks up while CallDex® stays flat, so RiskDex® climbs, and TailDex® rises off its lows. The overall level says nothing is wrong; the composition says otherwise. Someone is quietly paying up for downside and tail protection while the index sleeps. That divergence — calm level, firming skew and tails — is exactly the setup that precedes many volatility spikes. Reading the indexes as a family is what surfaces it; reading VolDex® alone would miss it entirely.
Common pitfalls
Reading one index in isolation. VolDex® falling is not “all clear” if RiskDex® and TailDex® are rising underneath it. The composition matters as much as the level.
Comparing raw levels across names. A VolDex® of 22 is high for a broad ETF and low for a single biotech. Every index is most useful read against its own history — its percentile — not against a universal number.
Treating RiskDex® like a level. It is a ratio. It deliberately strips out the overall volatility level so you see directional lean; do not read a high RiskDex® as “volatility is high,” only as “downside is expensive relative to upside.”
What to do with this
Use the six as a dashboard, not a set of standalone alarms. Anchor on VolDex® for the level, read CallDex®/PutDex®/RiskDex® together for where the demand is leaning, watch TailDex® for tail stress the level can hide, and check TermDex® for whether the whole regime is calm or bracing. When several readings move the same direction at once, the signal is strongest; when they diverge from the price action, that is where the interesting trades live.
Next lesson · continue the courseUsing the Tools →
VolDex® is free to watch. CallDex®, PutDex®, RiskDex®, TailDex®, and TermDex® — plus the daily cross-index picture and each index’s live percentile against its own history — update every session inside ETF Analytics, so you see each reading the moment the market prints it instead of reconstructing it by hand.