Download from Bukkit.org: http://dev.bukkit.org/bukkit-plugins/ccurrency/files/1-ccurrency-build-1/

What is cCurrency?

cCurrency is the *lightweight* alternative to Economy plugins. It provides you with useful ways to transfer money to other players, including administering other player's accounts.

Why does it benefit compared to others?

Doing some performance tests, cCurrency averaged around 12% faster than most Economy plugins at processing funds.

For Developers, does it have an easy-to-use API?

Absolutely. This is one of the first plugins I've created that has an API that you can use freely. Simply put the cCurrency.jar in your build path, and call the API class using

CurrencyAPI cAPI = new CurrencyAPI();
cAPI.setPlayerAmount(Bukkit.getServer().getPlayer("Dinnerbone"), 100);

Does it have commands?

It does indeedy. Typing */ccurrency help* into your chat will provide you with a list of commands usable.

The commands have permissions, right?

Yes they do. Check the page here for more information on that.