What kind of unobtainium is worth trading between systems?

(Right now, somewhere on the internet, someone is building an Unobtainium altcoin, with a block time of a gigasecond and using on of monero's cast-off hashing algorithms)

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IIRC, the moon has helium-3, which would be useful in fusion reactors. Saturn may also. I’d have to reread “The Case for Space” to list others. https://www.amazon.com/Case-Space-Revolution-Spaceflight-Possibility/dp/B08CVTJ1BM