What is the risk reversal Δ25 (RR25)?

RR25 is the standard skew gauge: take the implied volatility of a put with delta |Δ|=0.25 and subtract the implied volatility of a call with delta Δ=0.25. Both contracts sit at a comparable distance from spot, so the difference is clean. By this convention a positive number means puts are richer (downside fear), a negative one means calls are richer (upside greed).

Does a put skew mean the market will fall?

No. Skew is mood priced into options, not a forecast. Puts can be expensive because large players are hedging long positions, not because anyone «knows» a drop is coming. Moreover, extreme skew more often works as a contrarian signal: when protection is being paid up for at maximum prices, the panic is frequently close to exhausted.

How is skew different from the volatility smile?

The smile is the whole curve: implied volatility at every strike, from far OTM puts to far OTM calls. Skew is one number off that curve: how much higher one wing of the smile sits than the other. The smile is the full map; skew is the compass needle on it — which way fear is leaning.

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What Is Volatility Skew?

Q: What is volatility skew?

Volatility skew is the difference in price (in implied volatility terms) between puts and calls sitting at the same distance from spot. It shows what the market is paying more for: downside protection (puts) or upside bets (calls). In crypto the skew is usually tilted toward puts — downside fear costs more than upside hope.

Volatility skew is the answer to one simple question: how much more does downside protection (puts) cost than a bet on upside (calls), if you take contracts at the same distance from spot?

By fair logic they should cost the same: both strikes are equally far away. But they don't. The difference between them is the skew. It is the price of fear versus the price of greed, written straight into the options board.

How it's measured: risk reversal Δ25

The standard yardstick for skew is called the risk reversal Δ25, RR25 for short. The recipe:

Take a put with delta |Δ|=0.25 — a «just in case» contract well below the market — and read its implied volatility (IV).
Take a call with delta Δ=0.25 — the mirror bet on upside, just as far above the market — and read its IV.
Subtract: put IV minus call IV. One number — and the market's whole mood is in your hand.

Why delta 0.25 and not simply «minus 10% and plus 10%»? Because delta automatically accounts for how far the strike is in probability terms. A |Δ|=0.25 put and a Δ=0.25 call are two contracts with comparable odds of paying off. If one of them trades richer, that isn't geometry — it is demand. Someone is willing to pay up for that specific side.

Which way crypto usually leans

In crypto the skew is mostly tilted toward puts: crash insurance is persistently richer than a ticket on the rally. The logic is simple — large players hold the coin and hedge it with puts, and crypto sell-offs are fast and deep, so protection against them carries a premium. That is the gauge's «normal» state: a moderate put skew is not news by itself.

Things get interesting when the needle moves away from normal. The skew deepens sharply into puts — the market is buying protection en masse, fear is growing faster than price. And when the skew flips into calls — upside tickets cost more than the insurance — that is a rare and telling state: euphoria. The crowd is afraid not of falling but of missing out. FOMO, digitized in volatility.

Skew at a glance

PUTS ↑skew to puts → paying for protection (fear)

CALLS ↑skew to calls → paying for upside (greed)

RR25 is a mood thermometer: whichever side of the board is richer, that side fears or craves harder. A deep put skew = panic priced in. A call skew = euphoria priced in. Neither says what happens next.

What skew does NOT tell you

A put skew ≠ «the market will fall». It is mood priced in, not a forecast. Expensive puts often mean nothing more than large players hedging long positions — they don't «know» about a crash, they are buying insurance.
Extremes more often work the other way. When protection is being paid up for at record levels, the panic is frequently close to spent — historically, extreme skew is more often a contrarian signal than a confirming one. In our backtests, skew signals are among the few stable leaders in long-vol strategies — but even there they are context, not a button: skew alone does not open a position.
It's a snapshot, not a film. Skew changes by the hour. One reading with no history is like a single frame from a match: to understand the game you need to see where the needle came from and how fast it is moving.

Skew vs smile — don't confuse them

Plot the IV of every strike — from far OTM puts on the left to far OTM calls on the right — and you get a curve shaped like a smile. The volatility smile is the whole map. Skew is one number off it: how much higher the left wing sits than the right (or vice versa). The smile shows the full terrain; skew is the compass needle on it: which way fear is leaning.

How we use skew at INDICIA

For us skew is a daily mood gauge, second only to DVOL:

On our volatility board — a skew chart by tenor: a week, a month, a quarter. You see not just «which way it leans now» but where exactly on the time curve the fear sits — in the near dates or the far ones.
In the morning brief — a «crowd mood» line: whether the board leans to puts or calls today and whether the lean is deepening. One line — and you know what the market is overpaying for this morning.

We do not trade skew blind. We read it as one gauge among several: DVOL says how much movement costs in general, skew says which side of that movement is being paid up for.

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INDICIA DESK · Crypto options market intelligence (BTC / ETH).
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