What if I could immediately turn any site into an SDK to start building on top of?

Backstory: I'm searching for an apartment right now, so I'm building a ton of automation to up my chances of getting in front of the right apartment owners as fast as possible.

Ideally, I'd use 5 - 10 sites worth of data to collect all apartments together and then process/apply/rate them automatically, but what if I had 50, 100, or even 10,000 sites? Thats where this idea came in.

Now, it's super easy to create an SDK for almost any modern JS-led site. This means I can build my Chrome extensions, CRUD apps, and automation way faster, which means more code in less time.