E commerce operator with no commission

hello friends
a person want to create an application which general public can download from playstore on their device for searching gold and silver rates.
people will register and put their rates of gold/silver for sale. however they cant sale gold on this App. buyers need to contact seller in offline mode.
so now the person who is owner of this application wants to obtain gst registration.
whether he will be considered as e commerce operator or not?
as no buy sale on the app.. ànd no charges from seller or buyer and no commission exist.
plz provide some solution..
very confused.