Post-War currency

The currency in the Fallout world has varied from game to game.

Fallout
Bottle Caps, also called Hub Bucks, are the standard currency in the first Fallout game.

Bottle caps are backed by The Hub merchants. The technology to manufacture bottle caps and paint the surface has been lost since the Great War, which greatly limits any counterfeiting efforts. Without new ones being produced, the finite supply of bottle caps serves to preserve their value.

Fallout 2
In Fallout 2, dollars backed by gold are being used by the 3 big powers: New California Republic, Vault City, and New Reno. Bottle caps have become worthless.

The town of Redding uses two different kinds of mine scrip as currency.

Fallout 3
Bottle caps are the standard currency of the Capital Wasteland in Fallout 3. Of note is that, unlike previous Fallout games, when you drink a Nuka-Cola, its bottle cap is added to your total money.

In addition to bottle caps, a form of pre-war currency is not uncommon. Pre-war money appears as a stack of indistinguishable bills. The item is valued at 10 caps per stack. Though most commonly found lying around or in containers, residents of Point Lookout sometimes carry pre-war money on their persons.

Fallout Tactics
In Tactics, both Brotherhood scrip and ring pulls are used.

Brotherhood scrip is a currency used only by the Midwestern Brotherhood of Steel for trade within the Brotherhood. Brotherhood traders accept only this currency with the exception of some outsider traders that are present in most bases and accept ring pulls.

Ring pulls are used by the Midwestern Brotherhood of Steel as currency when trading with outsiders. They are pull-tabs from soda cans. Ring pulls can be found all over the settlements in early missions and traders will accept them. There are usually some outsider traders in Brotherhood bases who will accept ring pulls as well.

Fallout: Brotherhood of Steel
In Brotherhood of Steel, bottle caps are used as currency, though Bawls bottle caps used instead of Nuka-Cola caps.

Waluta