The zollar is the only known accepted currency in Osea. They are at least used in the branches of Osean military; zollars can be used by squadron leaders to purchase new aircraft.
Only one denomination of physical zollar values is known to exist: the quarter zollar, which has an eponymous face value of Ƶ0.25.
The zollar is known to have been an active currency from 2004 through 2010, though it is likely much older and has existed for much longer.
In 2004, a new series of quarter zollar coins were put into circulation. The obverse ("heads") side featured a bust of newly-elected President Vincent Harling, an inscription of the year 2004, and the legend "TRUTH". The reverse ("tails") side featured the inscriptions "OSEAN FEDERATION" at the top and "QUARTER ZOLLAR" at the bottom.
- The zollar is likely based off the United States dollar; the quarter zollar coin shares a striking similarity to a quarter dollar coin.
- The zollar has a sign of scribal abbreviation much like the US dollar ($). The sign is Ƶ —the capital letter 'Z' with a stroke. This can be seen in Ace Combat 5: The Unsung War's mission debriefings and hangar screens.