Where is the leaderbord stored?

[Just-Nils]

I want to make a Discord bot, wich reads the leaderbord and returns it on command. To make this possible I need to know, how I (or the bot) can read the leaderbord.

[triagonal]

Are you talking about the Top Balances leaderboard (/baltop)? If so, you can use the new BalanceTop API service. You can access it using the Bukkit ServicesManager as detailed here:

import net.essentialsx.api.v2.services.BalanceTop;
//...
BalanceTop api = Bukkit.getServer().getServicesManager().load(BalanceTop.class);

Take a look at the API interface to see what kind of data you can access. Keep in mind that this service is only available on development builds, so ensure you're using the latest dev build of EssentialsX.

[mdcfe]

If by "leaderboard" you mean /balancetop, you can use the BalanceTop service to access the entries. Baltop data is calculated while the server is running and stored in memory, so if you want to access it from a Discord bot running in a separate process, you'll need to write a custom plugin as a bridge between your server and your bot.