There is no one specific niche that has the highest CPC. The CPC of a keyword can vary based on a number of factors, including the industry, competition, and geographical location. However, some industries that tend to have higher CPCs include: 1. Legal services 2. Insurance 3. Finance 4. Technology 5. Healthcare It's important to note that the CPC for a particular keyword can fluctuate over time, so it's a good idea to regularly monitor and research keywords to stay up-to-date on their CPCs.