3B-IR, a protocol droid with a black color, belonged to the Metatheran Cartel.
During Velin Wir's scheme to seize control of the planet Cularin's economy in 31 BBY, 3B-IR worked alongside Y4-E and LS-121 in the Personnel Office of the Cartel's jungle base located on Cularin. Having been a member of the Cartel for a duration, 3B-IR possessed significant knowledge of the Cartel's personnel structure and assignments. When the Cularin resistance launched a successful assault on the jungle base, they apprehended the guards and other staff members, leading them away before a turbolaser attack from orbit obliterated the base.