AntiFly

Lightweight Paper + Fabric flight-control plugin by CevAPI.

AntiFly is not a full anti-cheat.
It exists for one purpose only: to block flight and extreme movement exploits.

Only the following are checked:

• Unauthorized flight
• Excessive movement speed (ground, air, water)
• Elytra speed, stall, and slowdown behavior (optional)
• Vehicle flight while preserving normal mount jumping behavior

Nothing else is monitored or restricted.
No combat checks. No scaffolding checks. No packet analysis. No behavior profiling.

Designed specifically for anarchy and semi-anarchy servers that want to stop flight hacks without policing gameplay.

Platforms

• Paper: 1.21.x
• Fabric: 1.21.11 (mojmap, requires Fabric Loader 0.18.1 and Fabric API 0.141.1+1.21.11)

Install

Paper:

• Drop the Paper jar into plugins/

Fabric:

• Drop the Fabric jar into mods/

Ops Commands

These commands are available in-game. Requires op or antifly.admin on Paper.

/antifly enable
/antifly disable
/antifly status
/antifly help
/antifly exempt <player>
/antifly unexempt <player>
/antifly set airSpeed <value>
/antifly set airVertical <value>
/antifly set airNonFallTicks <value>
/antifly set antiKickWindowTicks <value>
/antifly set antiKickMinDescent <value>
/antifly set waterSpeed <value>
/antifly set waterVertical <value>
/antifly set groundSpeedWalking <value>
/antifly set groundSpeedMounted <value>
/antifly set elytraEnabled <value>
/antifly set elytraMaxHorizontal <value>
/antifly set elytraMaxUp <value>
/antifly set elytraMaxDown <value>
/antifly set elytraStallHorizontalMax <value>
/antifly set elytraStallVerticalMax <value>
/antifly set elytraStallTicks <value>
/antifly set elytraSlowdownMinSpeed <value>
/antifly set elytraSlowdownMinScale <value>
/antifly set elytraSlowdownGraceTicks <value>
/antifly reset <player>

Notes:

• /antifly set shows all current settings.
• /antifly set <key> shows the current value for that key.
• Default ground limits:
  • groundSpeedWalking=0.475
  • groundSpeedMounted=0.750
• Legacy groundSpeed remains accepted as an alias of groundSpeedWalking.
• Fence/wall top collisions are treated as valid ground support.
• Horse and other mount jumps have extra vehicle-air grace before flight is blocked.

Config

• Paper: plugins/AntiFly/config.yml
• Fabric: config/antifly.json