Coinkeep
Mining, combat, gear, building, farming, and one chapter for every vanilla advancement tab. Nothing to accept - just play, and progress tracks itself.
Every sale saturates that item's demand, so the tenth stack is worth less than the first, and demand recovers over time. Demand is per player, so nobody can crash the market for everyone.
From $1 to $100,000,000, as real items you can stack in a chest, hand to another player, or lose in lava.
Only the owner can open a vault, or break it. A Vault Cracker is the only way in, it is consumed on use, and you cannot see how much is inside before you commit.
Quests, chapters, shop tabs and entries are all JSON a modpack can retune - or skip the files entirely and edit the shop from chat with /coinkeep shop.
Chapters down the left with your progress in each. Two ladders show a quest's own tiers and where it sits among its siblings - hover any pip for the exact requirement and payout.
Buy from a categorised catalog, cheapest first, priced green or red by what you can afford - or switch to Sell and cash in your haul.
Turn your balance into notes on the Cash tab, and bank them again with one click. Your banked balance survives death - the cash in your pockets does not.
A Guide tab explains every system without leaving the game, so players are never sent to a wiki.