Jack's Economy
Automatable Economy Mod For Modpacks or Servers with Create Integration

All Items and Machines
Jack's Economy offers lots of items from machines, to currency and wallets.

Money Stacks
Placeable money stacks for each denomination of currency

Auto-Exporting
Here is a machine selling diamonds using rotational power from the Create Mod.

Configurable Shop
Completely configurable admin shop for modpack creators or server owners.

Using RF
There are machine variants that use RF instead of rotational power.