Canon

[Sky Shadow]

I can find no mention of currency on Cybertron. Does anyone care to enlighten me with any info they have on the subject.

In the UK comics, Shanix was a universal currency; in the G1 cartoon there were Galactic Credits and in Animated, Swindle and Lockdown trade in weapons and upgrades. But most of the time Transformers deal in energon and fuel.

[SkyWarp91]

In the UK comics, Shanix was a universal currency; in the G1 cartoon there were Galactic Credits and in Animated, Swindle and Lockdown trade in weapons and upgrades. But most of the time Transformers deal in energon and fuel.

^
Yep, basically it - http://tfwiki.net/wiki/Transformer_economics