Widgets were a currency used on the island of Mata Nui which took the place of barter and trading systems. It was based on the protodermic currency used on Metru Nui.1
Notes
In an alternate universe, Lesovikk once made a remark about a "five-widget tour" of the Coliseum.2
Roodaka once made a remark about "those ridiculous Matoran widgets."3