Possible to know about circulation?

[RapTarX]

Is there a way to know how much BTCs are in exchange or going through tx? More specifically, out of 18,575,537 BTC (currrent circulation), how many BTCs are not moved from last month or last few months excluding the BTCs stored in the known addresses of different exchanges or custodial services? Is it possible to know, any tool out there?

[AdolfinWolf]

You mean.. just how long a UTXO has been unspent?

Not sure, shouldn't be too hard to figure out.

This seems interesting, https://unchained-capital.com/blog/hodl-waves-1/, although I'm not so sure if it's still accurate.

[figmentofmyass]

glassnode tracks the balances of major exchanges:
https://studio.glassnode.com/metrics?a=BTC&m=distribution.BalanceExchangesAll

however, you need a paid account to see up-to-date data. with a free account, they cut data off at 1 year ago---not very useful.

this site tracks the holdings of companies who have bitcoin reserves, including grayscale, coinshares, and other institutional grade custodians: https://bitcointreasuries.org/

[RapTarX]

You mean.. just how long a UTXO has been unspent?

Not exactly I'm looking for that but at minimum that would work though. In fact, I'm looking for how much BTCs are into the hand of custodial services exactly and other merchant accepting BTCs etc (in a word, in real circulation); above post has shared some of them which shows balance of major exchanges but not other services.
What I'm looking for is a bit tricky to get, we can only speculate and that's why I would classify unspent BTC since last two months as out of such services.