Harpy Express AC

Simple server side prevention for against cheaters

1.5K Downloads

fabricminigameutility

Rent Server with this Mod

About this Mod

How to Install:

Download the mod.
Place it in your mods folder.
Launch the game.
Enjoy!

What the Mod Does:

OP'ed players can bypass everything
Prevents dropping items
Detects jumping (allows: bouncing, swimming, levitation) and tp's the cheater
Knife
- Fixes killing without knife
- Fixes killing while in spectator
- Prevents killing yourself using the knife (can be done by manipulating packets)
Gun
- Decreased serverside range
Customisation!
- Gun and Knife range using setGunRange and setKnifeRange

You can still jump and drop while in creative

Dependencies:

Harpy Express

Available Versions

Harpy Express AC 1.0.3release

MC 1.21.1fabric

December 1, 2025

Harpy Express AC 1.0.3release

MC 1.21.1fabric

November 30, 2025

Harpy Express AC 1.0.2release

MC 1.21.1fabric

November 29, 2025

Harpy Express AC 1.0.1release

MC 1.21.1fabric

November 29, 2025

Harpy Express AC 1.0.0release

MC 1.21.1fabric

November 29, 2025

How to Install Harpy Express AC on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

Install Mod

Open the mod browser in the dashboard and search for "Harpy Express AC". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.1

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Harpy Express AC server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is Harpy Express AC compatible with fabric?

Harpy Express AC officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Harpy Express AC – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Harpy Express AC consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.