Y4-E, a droid of the protocol droid type, had a silver exterior and was the property of the Metatheran Cartel.
During Velin Wir's scheme to seize control of the economy of the planet Cularin in 31 BBY, Y4-E worked in the Personnel Office of the Cartel's jungle base located on Cularin, together with 3B-IR and LS-121. By this time, Y4-E possessed extensive knowledge of the Cartel's structure and the assignments of its members, having been with the organization for a significant duration. Following the successful assault on the jungle base by the Cularin resistance, the guards and other personnel stationed at the base were taken prisoner and led away before the base's destruction by a turbolaser assault originating from space.