Jas Emari (in the canon novel Star Wars: Aftermath) refers to the Republic's currency as dataries.
And with it, her breath catches in her chest. She feels like someone
who has dug a hole in their backyard only to find a trunk full of Old
Republic dataries—a box of unexpected treasure.
There's no real indication that it's anything other than a synonym for 'Credits'.
Within the Legends (EU) novels, there's a few mentions;
“Precisely. We’ll have to have the aurodium converted to Republic
dataries, even though that will require some time.” Palpatine fell
silent for a moment, then said, “May I suggest that one of my aides
help you set up a special account with a bank on an outlying world
that won’t ask questions about the origin of the ingots. Once the
aurodium is safely deposited there, you’ll be able to transfer funds
through the InterGalactic Bank, and draw against the account in the
form of Republic credits.” Havac clearly liked the idea. “I know
you’ll put the funds to the best possible use.”
Star Wars: Cloak of Deception
He passed encampments of beggars, and bright-colored tents where gamblers sat and beckoned him to come inside. He saw a troop of fire-talkers, and a trio of Gamorrean guards who took turns bashing each other with a club. Weather-beaten water prospectors pushed their way to the arena, eager to gamble away what little wealth they had. Vendors sold water in small containers.
“Only ten dataries!” one called to Boba. “Cheapest price at the arena!”
“No thanks,” muttered Boba. His tongue felt like a rock in his mouth, swollen and dry.
He’d better earn some credits soon. Really soon.
Star Wars: Boba Fett - Hunted