Most modes of public transport in İzmir (Metro, İZBAN suburban trains, ferryboats, city buses) accept these two methods of payment:
—3-5 Bilet, ( üç-beş bilet, ewtch-BEHSH bee-leht), a three-fare disposable RFID chip card ( called anvalid for 35 days from the first use. If your stay in Izmir will be brief, this is your best bet.
—Kent Kart, a durable credit-card-sized stored-value RFID chip card bought for a few liras, then loaded with as much credit as you think you might use. If you plan to stay in Izmir for more than a day or two, this card may make sense for you.