Which of the following is NOT a security measure for APIs?

Anonymous access is not considered a security measure for APIs. Security measures are designed to protect data and ensure that only authorized users or applications can access or manipulate the API's resources.

Data encryption secures data in transit and at rest, making it unreadable to unauthorized users. Rate limiting helps to prevent abuse by controlling the number of requests that a user or application can make to the API within a certain time frame, protecting against denial-of-service attacks. OAuth authentication provides a framework for authorizing users securely, ensuring that only those with valid credentials can access the API.

In contrast, anonymous access allows users to access API resources without any authentication, which can expose the API to various security threats, making it a poor choice for protecting sensitive data or functions.