Is there a API for Google Keep? I want to make a windows 8 app for Google Keep, so that it synchronizes with your phone.
I looked into the Drive SDK because Google Keep is a extension of Google Drive, but I couldn't find it.
No there isn't. If you watch the http traffic and dump the page source you can see that there is an API below the covers, but it's not published nor available for 3rd party apps.
Check this link: https://developers.google.com/gsuite/products for updates.
However, there is an unofficial Python API under active development: https://github.com/kiwiz/gkeepapi