Boundless API
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.21.1 on Fabric. On other versions it may install and then do nothing.

An extensive API with an emphasis on abilities, effects and combat. This API aims to streamline the process of creating new characters and abilities by providing a simplified yet powerful interface for the user to interact with in a modding environment context.
The API achieves these goals through the use of the following:
* The Action system. An Action is a series of tasks which the user specifies in order to acomplish a goal. For example, a 'melee attack Action' could be comprised of an initial wind-up animation, followed by a sound effect, and finally a damage impact frame. The Action system works by having the user feed in a linked list comprised of an integer key and a biconsumer value. The key dictates the 'tick' upon which a given task is executed, and the biconsumer is the task itself. For example, for a delay of 5 ticks, the user can set the key for an entry to 5.
* HeroActionEntity: An entity which helps leverage the capabilities of the action system, managing and working with Actions in order to produce the desired results. Allows for hitbox collision and rendering.
* Ability system: Easily bind abilities to heroes in order to use them in-game!
* Utils + Helper methods: Utils + helpers for commonly used methods in the mod. Allows ease of interactivity and more readable code.
* Automatic Hero registration: Integrates methods for easily adding new heroes to the game! This includes itemgroup registration + automatic datagen for models and translations.
* Custom attributes + effects: 'Damage resistance' attribute + 'Invulnerability' effects which are very useful in everyday modding.
* Many other things
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as boundless-1.0.7.jar — drop this file into the mods folder
- Download size: 1.2 MB
- Download link checked 2 Oct 2026 — working
These come from our own check of the pack file, not from the source page.