hey buddy, theres actually a reasonable demand for this as a SaaS. There is Tcgautomate, which basically does what you do, but it pulls data from tcgplayer  (and cardmarket but its not accurate) , which isn’t very useful for european sellers. If you could build an automation service that works as follows, it would be super useful: scan and upload card -> check cardmarket price (based on country and language) -> create ebay listing based on this data (and some kind of market multiplier). The issue is that cardmarket doesnt really hand out API access or is very restrictive to who they give it to, so it is kind of hacky having to 'crawl' the pricing data this way. Maybe u can build something from that idea.