Comment by JimXugle

Not specific to the CPG realm, but I've had some very good luck working with the OpenAPI-devtools Chrome Extension[1] (previous discussion here on hackernews[2]) to discover the underlying APIs of various sites that I want to scrape data from.

[1] https://github.com/AndrewWalsh/openapi-devtools

[2] https://news.ycombinator.com/item?id=38012032