@Dan Jones Unfortunately there is no API that provides the updated list and the same feedback is provided in feedback page.
For now you can automate this by calling this URL from your REST client and traverse to get the actual download URL as this download URL will change if there is new json file uploaded. Researching found this stackoverflow article which can help you. You need to test it and change it according to your needs.
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.