Available through https://api.earth616.org/
This is the place to look for updates regarding the MCU timeline API, which currently is a regular document at this site here. Below is links to documents on how to use the new open API for the MCU Timeline view.
We are working on making a specific https://api.earth616.org for this API Tool, so developers can feel more familiar with the request. In each resource, there are clickable links directly to examples that can be used. Since that the old MCU documents page is growing very quickly and is about to be very hard to maintain, this page is the first part of a replacement for the that project. Instead of having just this page, we're building it as an auto updating API.