The hard part about the web is that API's aren't just available even if the website owner wants them exposed (big if).

I embedded a Google Calendar widget on my Book a demo page, I don't know the API and Google doesn't expose/maintain one either.

What we are doing at Retriever AI is to instead reverse engineer the website APIs on the fly and call them directly from within the webpage so that auth/session tokens propoagate for free: https://www.rtrvr.ai/blog/ai-subroutines-zero-token-determin...