Utilization of APIs in applications, both web-based and mobile, allows developers to integrate and exchange data/services between applications, either on one platform or platforms across. Using API can increase time efficiency, development flexibility and save costs. However, the use of a very broad and flexible API in the process of exchanging data also creates a risk of exploitation by hackers. API Security is a solution that can be used to protect API from cyber attacks and abuse by legitimate parties in the form of Man in the Middle (MITM) attacks. The process is done by encrypting every data that is transferred between API servers. The API Encryption ensures that all API request processes come from legitimate and valid sources or parties and that all responses from the API can be protected from interception by unauthorized parties. API Encryption is used to facilitate data exchange so that the confidentiality and authenticity of the data is maintained.