A dealer map requires dealers who are obligated to hedge, which requires a real options book. Take the book away and there is no gamma, no flip and no walls — not thin ones, none.
Only a handful of coins have a listed options book at all, and beyond the two majors even those are thin.
The three tiers
Real book. BTC and ETH, where open interest is deep enough that gamma is genuinely computable, plus a US-listed ETF book on each — a separate map, not an addition.
Thin book. The smaller listed coins, where the map computes and deserves much less confidence — the cautions in reading a thin options book, including walls that one block trade can create.
No book. Everything else. Here a gamma level would be invented, and inventing one is the standard mistake in crypto analysis.
What to read instead
Where a perpetual exists, the leverage layer: open interest for how much is on, funding for which side is paying, and liquidation structure for where forced flow would appear.
Where neither exists, liquidity structure — depth, direction of depth, concentration — because for a token whose dominant risk is the exit, that is the more honest read anyway.
Why it matters that a tool says which
A product that renders the same gamma-flavoured dashboard for every coin is telling you something untrue about most of them. The useful behaviour is refusing to draw a level that has no mechanism behind it, which is the discipline in a distant flip is still an answer.