Building a marketplace to buy & sell- Domains, Websites, Apps, YT channels and SM account.

Hi hunters, I am working on a marketplace where we can easily buy & sell- Domains, Websites, Apps, YT channels and SM account. Current features: Bidding System Internal Chat/Message System Real-time Google Analytics reports Domain Ownership verification SEO Optimized Bulk Listing Uploads Escrow services Email Notification Need your suggestion if we missed anything here? Regards, Pankaj