Crypto options data is not licensed the way US equity options data is. The chain is public, which means the raw material for a dealer map is available to anyone willing to compute it.
So yes — a basic BTC or ETH gamma read is free somewhere, and several dashboards publish one. Anyone charging for that alone is charging for arithmetic over public data.
What free tiers generally cover
Current funding, open interest and liquidation totals are widely published. A BTC and ETH gamma summary computed off the public chain appears on several free dashboards. Spot prices are everywhere.
The NoVo Crypto Market Map gives the same things away for the same reason: charging for something the market hands out is a poor trade for both sides, and it makes a paid product look thinner than it is.
What is not free, and why
History. Public endpoints serve a snapshot. Ask what a pool’s depth or a book’s gamma was last Tuesday and there is no answer available anywhere — it had to be recorded at the time, and it cannot be backfilled.
Breadth. Computing two coins is a weekend project. Computing every coin with venue coverage, plus the on-chain half, continuously, is an operation.
Gamma by strike, the walls and the flip. Summary figures are common; the profile is not, and the profile is where the levels are.
The equity contrast
US options data is licensed, which is why equity dealer maps sit behind paywalls as a matter of contract rather than of effort. Crypto has no such constraint, so the paid line falls in a different place: not access, but history, breadth and depth.
How to judge a paid crypto tool
Ask what it has that the public API does not. If the answer is a nicer rendering of the same snapshot, the free version is the product. If the answer is a recorded history and coverage nobody else assembled, that is a real thing to buy.