Akbil is an integrated electronic ticket system used for fare payment in public transport of Istanbul, Turkey. It is currently being phased out and replaced by the Istanbulkart; while the remaining ones can still be used, new ones are no longer sold. It is valid for boarding buses, funiculars, LRT, metro, commuter trains, ferryboats and trams operated by the Metropolitan Municipality. Unlike payment by cash, the Akbil allows passenger transfer service within the transportation network under some defined conditions. Akbil is an acronym formed from "akıllı", which stands for "smart", and "bilet" meaning "ticket".
The Akbil device is touched to the reader at the faregate to gain access for boarding or on the vehicle to ride. The system uses iButtons or smart radio-frequency identification cards as tickets. Akbil's are 1-Wire (iButton) electronic tags. The keyfob version of the device has the emblem of the Istanbul Metropolitan Municipality moulded on it.
The units could have been acquired from offices near major transport interchanges for a refundable deposit of 6 TL, and were loaded with credits in these offices in amounts up to 150 TL. Alternatively, they might have been loaded at special purpose machines, newsstands or small shops which offer this service.