From its inception, the credit was backed by the immense wealth of the planet Muunilinst and the InterGalactic Banking Clan (IGBC)¹

Its shallow oceans contained hundreds of "smokers," which were conical volcanoes built up by powerful vents in the crust. Many, though not all, of these smokers spewed out superheated gases containing rich, pure precious metals from the planet's core. The very cones surrounding these vents were made up of layers of precious metals ...²

The IBC had their own data-server that allowed clients to access to the banking clan's datacom-net.³

At an unknown point during the Separatist Crisis, Chancellor Palpatine secretly opened several accounts in which he secretly subverted whole-planetary funds to be used at a later point, tax-free and account-free, so that several corporations affiliated with the IGBC (including Yarrow Industries) could profit.³