Is there an upload API for Google Photos (photos.google.com)?

Question

Does the Google Photos app, released on May 28, 2015, have an API which allows uploading of photos? The app seems to build on Picassa and Google+. Can one of their APIs can

Answer 1

By the looks of it Google Photos is based off the same system Google+ handled photos which was through the Picasa Web Albums Data API.

EDIT: So I came across this question while trying to develop something using Google Photos. Currently I am working on an application that will transfer stuff from Dropbox over to Google Photos.

I can confirm that Google Photos does indeed use Picasa Web Albums API. The API is simply a data storage for anything related to Photos. Drive and Google+ make use of the Data API to persist photos. Looking at picasaweb.google.com you can see it redirects you to Google+ and shows a collection of all of your photo.

You can actually experiment by looking over the Protocol Guide You can further experiment by using the OAuth 2.0 Playground through the Picasa API.