This mod was intended for the After The Flash Official Server, but is dependency-free and server-friendly! There is no way to get coins other than through creative or admin commands in vanilla, in which they can be converted to and from versions.
The currency is called "Yumi" and the iterations are as follows: Yumi, Shile, Gil, Plati, Glowing Yumi, Glowing Shile, Glowing Gil, Glowing Plati, and their pile forms. There is also a music disc with a rap song on it about money.
Coins to Coin Piles (And Vice-Versa)
Coin Piles to higher tier coins (And the other way)
Monetary Disc Recipe (All Glowing Coins & Piles)
Q&A
Can I use this in my modpack: Yes
Can I redistribute on other sites: NO! I SWEAR THAT IS NOT OKAY!
Will you backport to 1.11 or lower? No.
Will you update to newer versions? Give it time.
Can I contact you anywhere? Yes, you can find me on discord, but unfortunately at this time, all my servers are closed-invites.