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LootCrates is a fully-featured crate/lootbox plugin for Paper 1.21.1 servers that lets you create custom reward crates players can open with keys.
/lootcrate - Player commands for viewing crates and history/lcadmin give <player> <crate> - Give crate items/lcadmin givekey <player> <crate> - Give keys/lcadmin edit - Open crate editorlootcrates.use - Open crateslootcrates.admin - Admin commands and crate placementNo dependencies required - works standalone on any Paper 1.21.1+ server.

A Minecraft lootbox plugin with placeable crate chests, 25 opening animations, customizable keys, and full NBT item support. Edit crates by breaking them in creative mode, manage rewards with shift-click, and customize everything through the GUI.