Efficient RSS Feed Monitoring for Articles and Blogs with Clay

# RSS Feeds and news/blog monitoring - Clay as the processor On a daily basis I'd like to surface new articles, blogposts around certain topics on pages that our buyer personas potentially know about. This in order to enhance our social presence by reacting or using these articles in social posts. Now, I have I have a large number of keywords (500+) and a moderate number of news/blog domains I'd like to monitor. (RSS feed into Clay - Clay would be where I would transform the outcome, prioritise, generate excerpts etc) A simple Google Alert to RSS doesn't seem to work as it's not letting me input multiple keywords or even control what websites to look at. Have you come across any tool that would be useful for this purpose? Ideally NOT large suites that do a bunch of other things also that I will not use.