I had to look up the Fictional Currency of many different Sci-Fi worlds for an online poll, so I figured I’d share what I found here:
Galactic credits standard
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.
Source: http://starwars.wikia.com/wiki/Galactic_Credit_Standard
Kalganids
Fictional Currency used in the book “Second Foundation” in the Foundation series by Isaac Asimov
Source: http://fr.wikipedia.org/wiki/Kalganid
Agatean rhinus
Rhinu
The standard unit of currency in the Agatean Empire in Terry Pratchett’s Discworld. In its usual form as a pure gold coin, it can be divided into half-rhinu and quarter-rhinu pieces, for ease of making small purchases.
Source: http://wiki.lspace.org/mediawiki/index.php/Rhinu
Flanian Pobble Beads
Fictional Currency from Douglas’ Adams “Hitch Hikers Guide To The Galaxy”. It is only exchangable for other Flanian Pobble Beads and is therefore useless.
Source: http://hitchhikers.wikia.com/wiki/Flanian_Pobble_Bead
Latinum
Fictional currency of Star Trek, particularly Ferengi’s.
Source: http://en.memory-alpha.org/wiki/Latinum
Dollarpounds
Fictional Currency of the BBC SciFi comedy “Red Dwarf”. The dollarpound is a fictional currency used in both the series and the novels.
Source: http://en.wikipedia.org/wiki/List_of_Red_Dwarf_concepts
Brandar tiles
The fictional currency of the series Farscape.
Source: http://en.wiktionary.org/wiki/Appendix:Farscape/brandar_tile
Spacebucks
The fictional currency used in the cult classic film Spaceballs.