It's free in 60 minutes, over 60 minutes you can pay by the bus IC card:
60~120 mins, 1 yuan;
120~180 mins, 2 yuan'
after 180 mins , every one hour will be charged of 3 yuan.
And if the borrower use the IC card to take the bus during his rental period, there's some discount additionally.
The bikes looks new and clean. Hangzhou is really a friendly city for tourists.