No cash on dolmus as such, but can pay on some and get a card to use. I have seen some that are just one journey cards and others that you can top up. Top up better obviously. The shop just down from the dolphinless roundabout, general store, next door or one after Huner on the corner, sells cards and tops up cards also.
Lots of dolmus running, every few minutes along the Sahilden route that I use. No standing, masks have to be worn.