To my knowledge, there's no kindle API

https://forums.developer.amazon.com/questions/68355/regardin...

Upon research, there's a few tools like https://readwise.io/ and clipping.io which are chrome extensions.

They webscrape your homepage highlights here:

https://read.amazon.com/notebook

https://read.amazon.com/kp/notebook?ft

Readwise is like evernote for kindle highlights. It sends 10 or so highlights as a daily message email.

that's a webscraper not an official api though, reading through it uses beautifulsoup.

The best way I know to get highlights from kindle (I only use iPhone) is to click the "My Notebook" icon (looks like a letter paper page), click the export button, and then send to email. There is a notecard option there as well but I haven't tried it. Not exactly a solution but I'm mentioning it because it took me a while to notice.