How to Enable Ghost's Public API
Ghost's API is currently in beta, but is fully functioning as a way to grab read only data of your blog.
Some of the benefits of using the public API are that it allows you to create a list of your most recent posts or adding a tag menu to your blog.
Here is how you can enable the API:
Log into the admin section of your blog
In the left hand column, click on Labs
Now the API is enabled and you can use its functionality however you want.