Atra Anti-Cheat | Advanced Anti-Cheat System

Atra Anti-Cheat | Advanced Anti-Cheat System | 1.8-1.21.4 -----

Powerful anti-cheat with prediction-based detection and minimal false positives

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Atra AntiCheat
Advanced Anti-Cheat System for Minecraft 1.8 - 1.21.4

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Overview

Atra is a powerful, prediction-based anti-cheat plugin designed to protect your Minecraft server from cheaters. Built with modern detection algorithms and extensive configuration options, Atra provides comprehensive protection while minimizing false positives.

Key Features:

18 Advanced Checks - Combat, Movement, Packet, and Misc detection
Prediction-Based Detection - Server-side movement replication
⚡ Lag Compensation - Automatic ping and TPS compensation
VL System - Violation Level tracking with auto-decay
Real-Time Alerts - Staff notification system with spam protection
️ Full API - Custom events for developers
Multi-Version Support - Works on 1.8 through 1.21.4
Auto-Update Checker - Automatic update notifications

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✨ Features

Combat Checks (6)

Reach - Detects extended reach with ping compensation and ray-tracing
KillAura - Rotation analysis, multi-target detection, impossible rotations
AutoClicker - CPS tracking, click pattern analysis, standard deviation
Velocity - Multi-tick knockback tracking, expected vs actual velocity
Criticals - Fall distance validation, liquid detection, ground checking
AimAssist - GCD pattern detection, rotation consistency analysis

Movement Checks (6)

Fly - Gravity simulation, air time tracking, Y-velocity analysis
Speed - Server-side movement replication, friction simulation
NoClip - Collision detection, ray-casting, automatic setback
Step - Height validation, jump distinction, block checking
Jesus - Water walking detection with flight exclusion
Elytra - Hover detection, velocity pattern analysis

Packet Checks (4)

Timer - Packet rate measurement, burst detection
BadPackets - Invalid pitch, NaN/Infinite value detection
PingSpoofer - Reported vs actual ping comparison
InvalidMotion - Motion value validation, impossible speeds

Misc Checks (4)

Scaffold - Fast block placement, rotation analysis
FastBreak - Block break timing validation
Inventory - Inventory manipulation detection
AutoTool - Tool switching pattern analysis

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⚙️ Configuration

Atra is highly configurable with multiple configuration files:

config.yml - Main configuration

Code (Text):

debug: false

update-checker:
enabled: true
notify-admins: true

violations:
decay-rate: 1
decay-interval: 2

punishments:
setback-threshold: 20
kick-threshold: 50
ban-threshold: 100
ban-duration-days: 7

ping-compensation:
enabled: true
max-compensation: 300

checks.yml - Individual check configuration

Code (Text):

combat:
reach:
enabled: true
max-violations: 50
max-reach-survival: 3.0
tolerance: 0.25
ping-compensation: true

messages.yml - Customizable messages
punishments.yml - Punishment thresholds per check

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Commands

Code (Text):

/atra - Display command help
/atra reload - Reload configuration files
/atra alerts - Toggle alert notifications
/atra version - View version information
/atra debug - Performance analysis and statistics
/atra info <player> - View player information and violations
/atra reset <player> [check] - Reset player violations

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Permissions

Code (Text):

atra.bypass - Bypass all checks
atra.alerts - Receive alert notifications
atra.info - View player information
atra.reset - Reset player violations
atra.reload - Reload configuration
atra.version - View version information
atra.debug - Access debug information
atra.admin - Full administrative access

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Installation

Requirements:

Minecraft Server 1.8 - 1.21.4 (Paper/Spigot)
Java 21 or higher
ProtocolLib 5.1.0+ (Required for packet checks)

Installation Steps:

Download ProtocolLib from here
Download Atra AntiCheat
Place both JAR files in your plugins folder
Restart your server
Configure config.yml to your preferences
Reload with /atra reload

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‍ Developer API

Atra provides a comprehensive API for developers:

Maven Dependency:

Code (XML):

<dependency>
<groupId>dev.draxel </groupId>
<artifactId>atra </artifactId>
<version>1.0.0 </version>
<scope>provided </scope>
</dependency>

Example Usage:

Code (Java):

// Get player data
PlayerData data = AtraAPI. getPlayerData (player ) ;

// Listen to events
@EventHandler
public void onFlag (FlagEvent event ) {
Player player = event. getPlayer ( ) ;
Check check = event. getCheck ( ) ;
String info = event. getInformation ( ) ;

// Custom logic
event. setCancelled ( true ) ;
}

// Reset violations
AtraAPI. resetViolations (player, "reach" ) ;
AtraAPI. resetAllViolations (player ) ;

Custom Events:

FlagEvent - Called when a player is flagged
ViolationEvent - Called when violation level increases
PunishEvent - Called when a punishment is executed

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VL System

Atra uses a sophisticated Violation Level (VL) system:

Small suspicious activity: +1-5 VL
Medium suspicious activity: +5-10 VL
High suspicious activity: +10-50 VL
VL Decay: -1 VL every 2 seconds during legitimate gameplay

Punishment Thresholds:

20 VL: Setback (teleport to last safe location)
50 VL: Kick from server
100 VL: Temporary ban (7 days default)

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️ False Positive Prevention

Atra includes multiple systems to minimize false positives:

Ping Compensation - Automatic tolerance adjustment based on player ping
TPS Monitoring - Relaxed checks when server TPS drops below 19.6
Grace Period - New players get more lenient checks for first 5-10 minutes
Bypass Permission - Admins can bypass all checks
Multi-Tick Analysis - Checks analyze multiple ticks before flagging
Statistical Methods - Uses standard deviation and variance analysis

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Performance

Atra is designed to be lightweight and efficient:

✅ Asynchronous packet processing
✅ Optimized data structures
✅ Minimal memory footprint
✅ Thread-safe operations
✅ No impact on server TPS

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Auto-Update System

Atra includes an automatic update checker:

Checks for updates on startup
Automatic check every 6 hours
Notifies admins when they join if update is available
Direct link to download page
Can be disabled in config

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Compatibility

Supported Versions:

✅ Minecraft 1.8.x - 1.21.4
✅ Spigot, Paper, Purpur
✅ ViaVersion, ViaBackwards, ViaRewind
✅ Geyser (Bedrock support)

Required Dependencies:

ProtocolLib 5.1.0+

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Support

Need help? We're here for you!

Discord: Join our Discord
Email: [email protected]
Bug Reports: Use the discussion tab
Feature Requests: Use the discussion tab

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⭐ Reviews

If you enjoy Atra, please leave a review! Your feedback helps us improve and helps others find this resource.

Thank you for choosing Atra AntiCheat!

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View on SpigotMC

Resource Information

Author:

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Total Downloads: 41

First Release: Nov 22, 2025

Last Update: Nov 23, 2025

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