There is a flat fare – 2.30 TL with Istanbulkart only (4 TL with token), paid in tokens (which are also valid on the funicular, modern tram, buses and trans-Bosporus ferry boats).[26] Akbil tickets/cards are also valid, which is the most popular method for long distance traveling. The Akbil ticket is valid on all metros, trams, funiculars, ferry boats and buses. Ferryboat and bus fares are not flat, so the price of this transfer ticket also varies depending on the distance to be covered on bus or ferryboat.