A volatility smile is implied vol by strike. Same expiry, different strikes, different IV. Plot it and you get a curve. On indexes that curve is usually a skew or smirk: OTM puts print richer IV than OTM calls. Insurance on the left. Not a GEX bar.
GEX is how hard listed open interest shoves a dealer’s hedge. Smile is what the market *charges* for options at those strikes. Two questions. Two charts on our Gamma tab. People mash them into one screenshot and call it a setup. Don’t.
If you want the live picture, open Gamma, type a ticker, hit Volatility smile. Each line is an expiry. Dotted line is spot. OTM puts below spot, OTM calls above — that’s the hint on the tab. This page is the legend.
What implied vol is doing here
The market doesn’t quote “true vol.” It quotes prices. Back out the vol that makes a model match that price, and you get implied volatility. One number per contract. Across strikes, those numbers are not equal. Black-Scholes assumed they would be. 1987 and every crash since said no.
If every strike had the same IV, the plot would be a flat line. It isn’t. The U-shape is a smile (FX and some names). The lopsided U — high on the put wing, lower on the call wing — is the equity skew. People say smile when they mean skew. Fine. Just know indexes are usually a smirk, not a happy face.
Why puts are rich on SPY: crashophobia, funds buying protection, the fact that indexes fall faster than they grind up. That bid lifts OTM put prices, which lifts put IV. It is not a dealer-gamma bar. A steep put wing can sit next to a quiet GEX put wall, or next to a violent one. Look at both charts. Don’t infer one from the other.
Why a name can smile both ways: takeovers, squeeze chatter, call-buying manias. Upside IV can fatten. Then the smirk flattens or inverts. That’s a story about *demand for options*, not about call walls.
One line per expiry
Near-dated smiles are jumpy. 0DTE IV is a weather vane. A monthly smile is slower. A leap is a climate. On our tab each selected expiry is a colored line. The hint is literal: each line is an expiry.
If you left five dates on, you get five lines. That’s useful. It’s also a lot. Isolate 0DTE if you want today’s insurance price. Isolate the monthly if you want the structural skew. Same instinct as the expiry filter on GEX — different Greek.
Term structure (IV by *expiry*, ATM) is a cousin. Backwardation — near IV above far — often means an event is priced. Contango is the boring default. We plot strike smiles, not a full futures-style term chart. Don’t demand a VIX term structure from this widget.
Smile vs GEX vs the walls
Smile Y-axis: IV %. GEX Y-axis: gamma exposure. Same X-axis family (strikes). That’s the only rhyme.
A fat GEX put wall is *contracts × gamma*. A fat put wing on the smile is *expensive insurance*. You can have expensive puts with little GEX if the OI isn’t there, or cheap-looking ATM vol with a huge gamma pile because everyone is in the same 0DTE strike. GEX vs open interest is the contract-versus-shove split. Smile is a third meter: price of vol.
Skew is not a put wall. Don’t draw support on 25-delta put IV. Don’t fade a call wall because call IV is “cheap.” Different toys.
IV crush after earnings will yank the whole smile down. GEX will also move because gamma depends on vol and moneyness. Related. Not the same screenshot. We don’t recap earnings. The method is: look at the smile *and* the profile after the print, don’t assume yesterday’s wing.
How to look at it without a vol-arb playbook
I look at three boring things.
Shape. Smirk, smile, or flat. Indexes: smirk is normal. Flat on SPY is the interesting day (complacent puts, or a call bid). A name with a call wing fatter than the put wing is a different animal than SPY.
Where spot is. The dotted line. IV dumped on a far OTM put you will never trade is a trivia fact. IV around the money is the weather for the options that actually have gamma.
Which line. Don’t average 0DTE and a quarterly in your head. The quarterly can stay smirked while 0DTE is a spike. That’s an event, not a personality.
Then I stop. I don’t sell the wing because a textbook said “sell skew.” I don’t buy puts because the smirk is steep — it’s often steep. The smile tells you what is *priced*. Realized is a different tape. GEX tells you how the *book* might hedge. Three sentences. No combo trade.
25-delta risk reversal is the textbook one-number skew: IV of a 25-delta put minus IV of a 25-delta call. We don’t print that statistic as a row. You can *see* it on the lines — put wing versus call wing, same expiry. If you need a single number for a spreadsheet, you’re on a different tool. This tab is the picture.
Risk reversals and GEX walls get compared in research notes. Sometimes a steep put skew and a fat put wall live together (everyone wants protection *and* the puts are open). Sometimes skew is steep and GEX is quiet (insurance is expensive, the pile isn’t there). That’s the point of two charts.
What the smile is not
Not GEX. Not max pain. Not a forecast of the next hour.
Not “smart money.” The wing is a clearing price. Dealers, funds, retail lotto — mixed.
Not a reason to ignore the profile. People discover smile, forget walls. The tab has both. Use both.
Not always available. If the snapshot has no IV points, the tab says so. Don’t invent a smirk.
How this looks on our Gamma tab
Button next to the gamma profile: Volatility smile. Hint under it matches this article. Colors are just expiries. Orange dotted = spot. Y-axis in percent.
Guests: delayed. IV of 0DTE moves. Delay matters. A free account: journal, one full report. Pro: unlimited tickers, not a Bloomberg vol surface. Single names: smiles can look drunk. SPY is the clean smirk. NVDA is a mood.
If you’re here from GEX: read what gamma is if the Greek is still mush, then come back. Smile is vega’s cousin (the vol the price implies). GEX is gamma’s stack.
A short way to use smile without a playbook
- Which expiry line am I actually looking at.
- Is this a smirk, a smile, or a pancake — and is that normal for this ticker.
- Where is spot on that curve, because far-wing trivia isn’t the tape.
- Then look at GEX separately. Then stop.
If those four are boring, good. Boring is the point. You wanted IV by strike. You got IV by strike.
Also in this series: what implied volatility is, what the VIX is, what GEX is, how to read SPY GEX, what is gamma in options.