C-bill

The C-bill, or ComStar Bill, is the form of currency used in the science-fiction universe of BattleTech and MechWarrior. C-bills make up about 10% of all currency in the Inner Sphere.

In context with the real world, a single C-bill has about the same value as five US dollars.

H-bill
The H-bill, or House Bill, is the base currency used by the five Houses of the Inner Sphere. The value of the H-bill is based on crucial resources, such as water. Each house H-bills make up about 90% of all currency in the Inner Sphere.