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The Galactic Credit Standard, simply called a credit or abbreviated to cred, colloquially referred to as Republic Dataries, and later known as the Imperial Credit, was the main currency in use in the galaxy since the time of the Galactic Republic.
http://starwars.wikia.com/wiki/Galactic_Credit_Standard
The galactic credit standard was established on Sojourn. From its inception, the credit was backed by the immense wealth of the planet Muunilinst and the InterGalactic Banking Clan (IGBC). During the Clone Wars, the IGBC backed the currencies of both sides, as it would do so again decades later for the New Republic and Imperial Remnant.

Republic credit ingots were a form of Galactic Republic currency, similar to the standard credit chip.

The credit ingot appeared as small, flat, rectangular bars of gold and silver-colored metal. Each ingot was between two and three inches in length; the silver ones being a bit longer than the gold ones. The ingots had symbols stamped onto its surface, including the symbol of the Galactic Credit Standard (AurebeshSans-Serif credit).