There is currently a 4.95€ fee for registering with emmy. You also get 4,95€ riding credit with your registration. It's valid for 3 months and can only be used on the standard rate. Please note that the registration fee cannot be used for packages, passes, or saver rates.
The rides will be billed according to an unlock fee and minutes spend on an emmy . So you only pay for emmy if you use emmy. You can reserve for free (up to 15 minutes) and extend your reservation anytime by another 10 minutes. Each extension costs €0.50 per 10 minutes. One minute of riding starts at 0.36 € and one minute in parking mode costs 0.05 €. You can find more information here: Prices.