Namebio (which is not complete but shows many sales if they are over $100) can be searched for any extension - it shows 3 sales of .cash, the largest at $8340 for back(.)cash (all are single word).
Names containing bitcoin are popular, but there are so many people with things registered in that there is a lot of availability for those looking for domains. BitcoinFo(.)cash does make sense as a phrase, and starts with Bitcoin, both good. That being said finding a buyer for most domains, and for new gTLDs in particular, is a challenge.
Have you yet listed it on some markets like Undeveloped or Afternic?
I should have added that GoValue (the GoDaddy evaluation tool which is currently free but in beta) give a valuation of <$100 for it (they don't give values below $100, so it is saying the lowest value). You should get an estimate on Estibot (you can do one per day free - I've already used up my free one today). Bob
fyi...it might not be a good idea to post a name you do not own already. Not that any of the wonderful people here would take advantage, but giggle indexes this site within seconds of a post and to paraphrase the late great Dr Sagan 'billions and billions of people' may see it and snatch it up. Welcome to nps!
Oh yeah...nearly every question has been asked before here so spend some time using the search feature and read, read and read some more! Best wishes.
I agree with advice that @Mister Funsky gave to @Cruncher to in general not post names you are considering buying. That being said, this one, and three like it, were already up on a for sale landing page, so probably no harm done.
Re how accurate GoValue is, I think while better than Estibot overall, GoValue tends to over value domains so when it says <100 I would not pay much for the domain. Now it does miss things, sometimes splitting two words wrong, but I suspect this one it did understand the two words.
It uses prior sales, and not much to go on for .cash or for the two word domain name itself.