Player API Mod 1.12.2/1.11.2/1.10.2 acts like an API and Library tool for making Minecraft mods. It is mainly made for mod developers.

Most mods that are designed for version 1.7.10 utilize core and library mods as a base. This base will make the mod updating much better. The game version 1.7.10 was just a beta version. Hence, it contained bugs and some glitches.
If you are in need of a base mod, then Player API is a good option. It has acted as a base for various mods. Besides, it aimed to help mod developers update their mods in a simple way.
With this API, you can use elements like “EntityPlayerSP” (the client class) as well as “EntityPlayerMP” (the server class). At the same time, you can decrease conflicts between mods as well.
Player API Mod helps some mods run in the game such as Aether, Flan’s Mod, Smart Moving, Galacticraft, Skyrim Craft, Thirst Mod, and more. You also need to install Minecraft Forge so the library can be functional in the game.