COIN calendar call spread: selling time twice

Same strike, two expiries. The short Oct 30 call decays on a steep curve; the long Nov 20 call decays on a shallow one. The difference between those two decay rates is the entire profit engine — which is why the position wants the stock to sit still.

Max profit occurs with COIN pinned at $195 on October 30, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $856 against the $464 debit, which is also the maximum loss.

Calendars are LONG vega, unlike most short-premium trades. The back month has more vega than the front, so rising implied vol helps you. At 68% ATM on the front expiry, COIN is the 2nd richest of the 20 underlyings on this site — calendars are best opened when front-month vol is rich relative to the back.

Because the legs expire on different dates, there is no single expiry payoff: the numbers on this page are marked to model at the near expiry (October 30, 2026) using each leg's own implied vol — the same convention the builder uses.

Max loss is the $464 debit, but reaching it requires a big move. The more common outcome is a partial loss on a moderate drift, which is why calendars get managed rather than held.

Vol term structure can move against you: if back-month IV falls while front-month holds, the position loses on vega even with the stock exactly where you wanted it.

The decay is relentless and it is front-loaded against you in exactly the window most retail traders hold. A long-vol position with no exit plan is a slow, fully-predictable loss.

One of the few names where a long straddle can be justified on level rather than timing: realized vol has repeatedly exceeded implied over multi-week windows when crypto trends. The cost is that theta on a 70-vol ATM straddle is punishing, so the position needs the move within weeks, not months.

COIN's Oct 30 strikes are $2.5 apart near the money (1.28% of spot). That is a coarse ladder: one rung is a large fraction of the implied move, so precision on the short strike is an illusion. 8.2k contracts of open interest on Oct 30 is thin, and a structure that needs four separate fills will pay for it. 40 strikes on that expiry — 74% of the board — carry prints that agree with their own implied volatility and hold up across the ladder, and those are the strikes priced here. Workable around the money, genuinely thin in the wings. Price your condor width against the open interest, not the ladder.

Skew is inverted: the 25-delta CALL implies 12.7% more vol than the put. That is the market pricing upside risk above downside risk — a squeeze, a takeover rumour, or a crowded short. Owning upside on an inverted skew means paying the expensive side of the surface, which is worth knowing before you buy the call. The term structure is in contango: the back month implies 2.5% more vol than the front. Calm now, uncertainty later — which rewards selling the front month and makes the back month an expensive thing to own outright.

At 68% ATM implied vol, the Oct 30 options are pricing a one-standard-deviation move of $39.88 over 33 days — roughly −20.4% to +20.4%, or $155.23 to $234.99. Owning vol here means believing COIN covers more than 20.4% in 33 days, and covering it in time.

The COIN-specific failure mode: Weekend gap risk. Every other name on this list stops moving at the close on Friday; the asset behind this one does not.