A micro SaaS alerting you on changes in a section of a web page (via XPath)

To automate one of my product's processes, I need to track changes on multiple web pages from different websites. I have a list of URLs, with XPath's to the elements I care about.

Ideally, I'd want a tool where I enter those URLs and Xpath's and start getting updates on every change.

There are loads of URL scraping tools on the market, and it's possible to achieve what I want with some of those. But I didn't find a tool that does just this, with zero setup.

So I am considering to build one. Is that something you might use? Let me know by getting on my waitlist:

https://weightless.so/rlgvdovc

Maybe I missed something and there's a tool exactly for this? Please be so kind to share in comments.