Public API for fair?

Is it possible?
I could develop a website for the fair’s. This would significantly improve the players life by allowing users to easily search for items they need. The site would include features like sorting filters and notifications for when specific items become available.

This system would not disrupt the existing trading economy; instead, it would enhance it by making trading more efficient and user-friendly. To preserve the current system’s integrity, the website would not display seller information and would exclude any direct communication between players.

Either it’s used for price checking (which people do complain about a lot) or it’d be used for buying & that would require being able to buy the item via the website/API/whatever & I’m not sure EHG would be happy with an external site doing stuff on their servers.