This API created for me and custom for me. But this can be useful for more people.
Worlds
setBlock(Location, Material)
Players
isOnline(String UUID/Username)
getWorldName(Player)
getXYZ(Player)
Command(Player, String command)
sendDelayedMessage(Player, String message, int Time /*1000 = 1 sec*/)
Server
ConfPlugin(String pluginName)
saveConfPlugin(String pluginName)
reloadConfPlugin(String pluginName)
Java
isNumber(int)
randInt(int)
firstUpperCase(String)
Items
Create(Material m)
Create(Material m, String name)
Create(Material m, String name, String lore)
Economy
setMoney(String playerUUID, int Money)
addMoney(String playerUUID, int Money)
removeMoney(String playerUUID, int Money)
getMoney(String playerUUID)
setJob(String playerUUID, String Job)
getJob(String playerUUID)

MyAPI 1.0
MyAPI is an API of money, players, world, server, other plugins and more!