The structure
A risk reversal pairs an out-of-the-money call with an out-of-the-money put — long one, short the other, classically at similar deltas. Because it sells one wing to finance the other, its price IS the skew: what the market charges to swap downside tail for upside tail. Where the skew chart describes, the RR quotes.
Why crypto’s RR is its own animal
Equity skew reliably pays for puts; crypto’s flips. In euphoric regimes calls carry the premium — upside is the feared tail, the FOMO side — and the RR trades positive in a way equity desks rarely see. Watching the crypto RR change sign is watching the market’s definition of risk itself rotate, one of the sharpest regime tells the surface offers.
As a trade, the fine print
Held as a position, an RR is direction plus short-a-tail: cheap exposure financed by open-ended risk on the sold wing, margined accordingly on the short leg. On thin wings the fills give back much of the elegance — the structure reads better than it executes for most sizes.
Reading it
Use quoted RRs as the skew’s honest price, watch sign changes as regime events, and remember that an extreme RR is a crowded tail-opinion — the wing everyone is paying for is rarely the one that pays out.