Almost every SEO Keyword Research tool has the CPC Metric in-built, I particularly love Ubersuggest. With Ubersuggest, you can enter your competitor's domain name, then you'll get a long list of almost every keyword that generates traffic for the domain. You should now use the Filter feature to sort the Keywords by Low Difficulty ( < 40), Search Volume (> 1000), and CPC (> $5). This way Ubersuggest will pull up the list of High CPC keywords which your competitor ranks for.