AuthX Velocity

AuthX Velocity is an original authentication plugin for Velocity that provides a plug-and-play hybrid login experience for Minecraft Java servers.

It combines the core ideas of MultiLogin-style account routing and LimboAuth-style secure verification into one workflow, so you can support offline users and premium/Yggdrasil users at the same time with minimal setup.

Basic information

• Dependency: LimboAPI (Modrinth)
• Velocity Support: Velocity 3.4.0 - 3.5.0

Why AuthX

AuthX is designed for mixed communities where players may join from:

• Offline mode launchers
• Mojang/Microsoft premium accounts
• Yggdrasil-compatible skin/auth providers (such as LittleSkin)

Instead of splitting your authentication stack into multiple plugins, AuthX gives you one consistent flow.

Key Features

• Hybrid authentication Intelligently distinguishes and supports both password-based login (offline users) and fast Yggdrasil login (premium/skin-station users).

• Secure limbo verification world Built on LimboAPI to isolate unauthenticated players without occupying extra backend server resources.

• User-friendly flow Clear in-game prompts guide players through login/registration. No command learning required.

• Flexible backend modes Supports local password backends and UniAuth integration, with migration and UUID tooling for real-world deployments.

• Modern account behavior Includes method binding control, password change management, and UUID auto-assignment options for new users.

Installation

1. Put the AuthX .jar file into Velocity's plugins/ directory.
2. Put the latest LimboAPI .jar into the same plugins/ directory.
3. Restart the Velocity proxy.
4. Edit configuration as needed.
5. Run /authx reload to apply config and language changes without a full restart.