Only a handful of coins have a real options book, and beyond the two majors even those are thin. The map computes identically — open interest times gamma, solve for the flip, find the walls — and produces numbers that look exactly as authoritative as the ones from a deep book.
They are not.
What thinness does to each figure
Walls become unstable. On a deep book a wall reflects accumulated positioning from many participants. On a thin one a single large trade can create or move it overnight, so a wall may be one trader’s position rather than a structural level.
The flip becomes sensitive. Solving for it re-evaluates the whole book, and when the book is small, few strikes dominate the answer — so it can jump by a large amount on modest changes in open interest.
Net gamma becomes small enough that it is unlikely to matter against spot turnover, which is the ratio problem from crypto gamma is smaller than it looks, at its most extreme.
Stale strikes
A specific hazard of thin books: strikes far from spot that have not traded in a long time still carry open interest, and still enter the calculation at full weight. On a liquid book those positions get closed or rolled. On a thin one they sit there, and the map treats a forgotten position as current structure.
The discipline
Publish the sample alongside the conclusion, or publish nothing. A wall quoted without the open interest behind it invites a reader to treat a thin book’s output as if it came from a deep one — the same failure as quoting a percentile off five observations in funding extremes.
And for the coins with no book at all, the answer is not a thinner map. It is a different reading entirely: leverage and positioning where a perpetual exists, and liquidity structure where it does not.