The Federation credit was the monetary unit of the United Federation of Planets. Although it was stated on more than one occasion that the economy of the future was very different, and that money no longer existed on Earth from as early as the late 22nd century or in the Federation as late as the 24th century, this medium of exchange did still exist within that period. (DS9: "In the Cards"; VOY: "Dark Frontier"; Star Trek: First Contact)