ACE AntiCheat

is a moderation and anti-cheat mod built specifically with modded Minecraft servers in mind.

It supports multiple mod loaders and Minecraft versions, combining client-side mod checks, server-side movement detection, Discord moderation tools, and optional screenshot requests to help server staff investigate suspicious players.

ACE must be installed on both the server and connecting clients.

Features

Detects known cheat clients and configurable suspicious mods

Detects sustained or abnormal flight

Designed to avoid flagging normal movement such as: Creative and spectator flight, Elytras, Falling, Vehicles, Ladders, Water, Levitation, Slow Falling, Other legitimate movement states

Clear flag information in the server console

Configurable review timers and delayed enforcement

UUID exemptions for trusted players or known false positives

Suspicious keybind detection for names related to things like X-ray, wallhacks, aimbot, and similar cheats

Informational control flags that do not automatically punish players

/aceanticheat flagtest <player> for testing the full moderation workflow

Discord Moderation

ACE can send detailed moderation reports directly to a configured Discord channel.

Moderators can quickly choose to:

Ban the player

Send a server message

Do nothing

Reports can include player information, flag details, and an enforcement countdown so staff have time to review what happened before action is taken.

Screenshot Requests

Server administrators can request a screenshot from a player's Minecraft client using:

/aceanticheat screenshot <player>

Depending on your configuration, screenshots can be shown to the administrator in-game, saved locally, and uploaded to your moderation Discord channel.

What does ACE capture?

ACE only captures the Minecraft game framebuffer.

It does not capture:

- Your desktop

- Other applications

- Personal files

- Your microphone

- Your camera

- Anything outside the Minecraft game window

Whenever an administrator requests a screenshot, the affected player receives a visible in-game notification telling them that a screenshot was taken.

Only authorized server administrators can request screenshots. Regular players cannot trigger them through a keybind or command.

By installing ACE and joining a server that requires it, players agree to this disclosed moderation feature.

THE PLAYER HAS TO ACCEPT A CONSENT FORM ON SERVER JOIN FOR THIS TO WORK

Built for Modded Servers

Movement checks can be difficult on heavily modded servers, so ACE intentionally uses conservative flight detection rather than assuming unusual movement is cheating.

Servers using custom flight, transformations, vehicles, movement abilities, or similar mechanics should test their setup and add UUID exemptions where necessary.

You can use:

/aceanticheat flagtest <player>

to test the flag and moderation workflow without relying on a real detection.

Configuration

ACE's server configuration can be found at:

config/aceanticheat-server.toml

Configuration options include:

- Exempt player UUIDs

- Discord bot settings

- Discord channel ID

- Delayed enforcement

- Review timeout

Never publicly share your Discord bot token. Using an environment variable is recommended when supported by your server host.

Dependencies

Packet Fixer is required on Minecraft versions where a compatible version is available.

For versions without a compatible Packet Fixer release, ACE uses its own bounded packet validation instead.

Please Keep in Mind

ACE is intended to give moderators useful evidence, not magically prove that somebody is cheating.

Client-side mod detection depends on information reported by the ACE client, and a deliberately modified client may attempt to hide or falsify that information.

Because of this, flags should generally be reviewed alongside player behavior and other available evidence rather than treated as automatically conclusive.

No anti-cheat can guarantee detection of every private or custom cheat client.