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Glossary · crypto options in plain English
If the Black-Scholes model — the formula the whole world uses to price options — were literally true, implied volatility would be identical on every strike. Plot IV across strikes and you would get a flat horizontal line. One asset, one expiry, one number.
The real market draws something else: a curve that bends up at the edges. Options far from spot — both puts deep below and calls high above — consistently trade richer (in IV terms) than options near the money. That shape is the volatility smile.
The model assumes daily price moves follow a normal distribution — a tidy bell curve where big jumps are all but impossible. The market knows that is false and prices accordingly. Two forces keep the wings of the smile lifted:
So the smile is not an anomaly or a market error. It is the market pricing tail risk more honestly than the model does.
The wings of the smile are almost never symmetric, and the asymmetry is its most informative part. The left wing is the puts struck below spot — bets on a fall and protection against one. In crypto (as in equities) it is bid almost all the time: crash protection systematically costs more than upside bets of the same distance. That is downside fear priced into the board — not into headlines, not into Twitter mood, but into live money someone is paying for puts right now.
The question is never «is the left wing bid» (it is), but how much. When it steepens beyond the usual — the bid for protection is growing, the market is getting nervous. When it flattens — fear is letting go.
The right wing is the calls struck above spot — bets on a rally. In a calm market it sits noticeably lower than the left. But in moments of euphoria — a vertical run, an assault on the all-time high, «this time it's different» — the right wing lifts: the market starts paying for upside participation as willingly as it normally pays for protection. It is the rarer and therefore more valuable picture: when you see a bid right wing, you know greed is being priced expensively right now.
On our volatility board the smile for BTC and ETH is laid out on three tenors — roughly 7, 30 and 90 days to expiry. The short tenor reacts to «now», the long one to structural expectations; comparing them shows whether the fear is short-lived or priced in for the long haul. Hover the cursor over any point on the curve and you get the exact IV of that specific strike, no rounding.
The smile at a glance
The wings of the smile are not analyst opinions — they are live money: what the market is paying right now for crash protection and for a seat on the rally. The asymmetry of the wings reads faster than any sentiment report.
The curve on the Fear & Greed board is part of the morning review: every morning we check how the wings moved overnight on both assets. And to avoid eyeballing «how bid» a wing is, we keep skew as a number next to it — the IV difference between puts and calls of the same distance (see volatility skew). One figure answers «how tilted is the smile today versus yesterday» — and it is the jumps in that figure, not its absolute level, that most often precede the interesting episodes.
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