Mob Trader

Crouch and right-click almost any mob in Minecraft and the normal trading screen opens. Each mob pays out in its own loot, and takes payment in whatever it eats or drops. Sheep want wheat and hand over wool. Endermen want ender pearls and hand over blocks they’d have stolen anyway.

Fabric, Minecraft 26.1″, “26.1.1”, “26.1.2”, “26.2”, “26.3 Works in single player

• Every mob has a pool of possible trades. Three get picked at random.
• Amounts roll inside a range, so prices differ from one animal to the next.
• The roll is seeded from the mob’s UUID: one particular cow always offers the same deal, but the cow beside it offers something else.
• Villagers and wandering traders are left alone with their vanilla trading.

Combat and tool mobs sell one piece of gear, enchanted the way an enchanting table would at the listed level. Higher level, better odds. Always one use only, and always expensive.

Because the roll is tied to the mob, the sword a given zombie is holding out is always that same sword. Walk away and come back, it hasn’t changed.

Roughly forty mobs have their own tables. A sample:

Anything without its own table falls back to a generic emerald list.

1. Fabric Loader 0.19.5 or newer for Minecraft 26.2
2. Fabric API 0.161.0+26.2
3. Drop the mod jar in your mods folder

Written to config/mobtrader.json the first time the mod loads.

"minecraft:zombie": [
  { "buy": "minecraft:rotten_flesh", "buyCount": 20, "buyCountMax": 48,
    "sell": "minecraft:iron_sword", "sellCount": 1, "maxUses": 1,
    "enchantLevels": 10, "enchantLevelsMax": 30 }
]

Top-level settings:

Any entity id works, modded ones included. Restart the game after editing. Delete the file to regenerate the defaults.

Needs JDK 25 and Gradle 9.5.1 or newer. The repo also builds on GitHub Actions; the jar comes out as a downloadable artifact on every push.

gradle build

• Hostile mobs keep attacking while the trade screen is open.
• A mob’s own right-click action is pre-empted when it has a trade table. Turn on requireSneak to get shearing, feeding and horse riding back.
• Stock resets when you close the screen.
• This is a mod not a plugin