Implied volatility sounds like a property of a coin. It is a property of that coin’s options. It is the volatility figure that makes a pricing model match what an option actually trades for. No option price, no implied volatility. Most coins fall on the wrong side of that line.
Where the number comes from
An option’s price depends on the strike, the time left, the current price and the expected movement. The first three are known. So the price can be turned around to reveal the movement the market is charging for. That is why options are quoted this way, as explained in why crypto options are quoted in volatility. The whole process starts from a traded price.
Which coins have a market
Bitcoin and ether have deep options markets with many strikes and expiries. Beyond them the list is short and the books are thin. The same boundary applies to dealer positioning, as the question of reading dealer positioning on altcoins explains. For the great majority of coins there are no listed options at all.
A thin book is nearly as bad
Some coins have options that exist and barely trade. The bid and the ask sit far apart. An implied volatility taken from the middle of a wide quote inherits the width. It looks like a measurement and behaves like a guess. The general problem is the one in a wide quote is not a price.
The temptation to borrow
When a number is missing, there is a pull to manufacture one. Take bitcoin’s implied volatility, scale it up, and call it the small coin’s. The result has the right units and no market behind it. Nobody is quoting options on that coin at that level. It describes an assumption about how the coin relates to bitcoin, which is a different thing from what a market is charging.
What every coin does have
Every traded coin has realized volatility, because every traded coin has a price history. How to measure it without fooling yourself is in measuring realised volatility. It looks backward, and that is its limit. It is also real. Coins with perps have funding, open interest and liquidation flow as well. Those say a good deal about how a coin is positioned without any options at all.
Where to see it
The NoVo Crypto Market Map shows dealer gamma by strike only on coins that have a real options book. Every other coin gets the read its data supports: funding per venue, open interest and 24-hour liquidation flow. Dr. NoVo, a markets SI, reads each coin on those terms and does not fill the gap with a borrowed figure.