Yes, WAFs can analyze the HTTP requests targeting the API and apply security rules to detect and block malicious traffic. This includes identifying and blocking common attack techniques such as SQL injection, cross-site scripting (XSS), and API-specific vulnerabilities. Additionally, WAFs can enforce rate limiting policies on API requests, ensuring that excessive traffic or abuse is controlled. This helps protect the API from brute-force attacks, denial-of-service (DoS) attacks, and other forms of excessive traffic that can impact its availability and performance.