The daily limit without ID verification has been increased up to 250€. No need to introduce the Id card or passport below that threshold.
Just curious, what would stop me from selling 250 euro worth of coins several time a day?
You need to register with your phone number. You put your phone number in and you receive back by SMS a code. If you have sell or buy in the same day you will be allowed only the difference between 250 and the sum of sell or buy of the day.