Welcome to our article!
The ender chest, in any of its variations, is a player's most private storage: it can't be stolen, blown up or taken away, and every player has their own. Our plugin turns the ordinary ender chest into a truly huge storage for your players' resources!
Let's not drag this out and go straight to the main features of this great plugin! It extends the classic ender chest: when a player types /ec or right-clicks an ender chest, this menu opens:

You can freely change the number of open and locked slots, as well as the overall look of the GUI menu, in the plugin config: set a limit of 27 slots, cut it to 9 or, if you like, fill all 54 slots with red panels!
The plugin supports Vault / PlayerPoints, which means chest upgrades can be bought with either regular or donor currency!
The price of each following slot is calculated by a formula. Parentheses are for addition and subtraction (they set the order of operations).
+, -, *, / (add, subtract, multiply, divide)
^ for exponentiation
% for a percentage of a number (for example, 50 % 200 means take 50% of 200)
And if you're a real mathematician, the formula also supports sines, cosines, tangents and logarithms:
sin(0)
cos(0)
tan(45)
log(100)
Just make sure you never divide by 0!
The main advantage of this plugin, the one that sets it apart from the few other ender chest upgrade plugins, is that there is no slot limit! The plugin has a page system: once the first ender chest page (all 54 slots) is fully unlocked, you can open a second upgrade page and keep unlocking slots there (and so on for all following pages). This means players can expand the ender chest as much as they like, though you can set a maximum in the plugin config.
A nice bonus is complete protection against resource duping via UiUtils through "Close without packet", something no similar ender chest plugin can boast.
We have to admit: there are less polished but more expensive alternatives, and you've surely heard of them. But hardly anyone will want to pay 1000 rubles for a plugin with fewer features! Still, we'll go over the main strengths of our plugin to show its edge over the rest:
To make the plugin as clear as possible for players, every interaction with upgrades shows an informative message, and you can customize them in the config file:

Thanks to database support, the plugin lets you sync ender chest inventories between any servers!
There are 2 item storage options: MYSQL and SQLITE.
The format is set with the database-type parameter. If MYSQL is selected, a mysql.yml file is generated where you can configure the database connection and connection pool parameters to fit your server (by default, the standard pool settings from the documentation are used: https://github.com/brettwooldridge/HikariCP).
No extra words needed here, you can see it all for yourself:
That's the end of our plugin's features. As you can see, it has the maximum level of customization, so it fits any anarchy server. The plugin is also actively maintained by the studio, so it will get new features soon.