Having an idea for the Saas, need suggestion

Hello people! I've been thinking of the service I can start working on and wondering how to validate the idea.

A long time ago I created a service that works as a permanent link to the product and depends on the platform opens the app store, google play, or just a landing page of the app with a description of that app. All you need is just to provide android package and ios bundleid, and the service will fetch screenshots from them and generated a landing page automatically.

Just wonder if this service still exists, would you guys use it? And what could be a paid functionality of it?