API for GCN circulars

[dj-256]

Is there an open api documentation for fetching and/or streaming GCN circulars? I followed the streaming guide but the events sent through kafka do not match the circulars posted online. I am looking for a way of fetching them programatically without scraping the GCN website.

I saw that the website is making calls to https://gcn.nasa.gov/circulars?page=x&_data=routes%2Fcirculars._archive._index but this does not seem like it is optimized for public use?

Thanks in advance!