API penetration testing

APIs carry the data and logic behind modern applications, and they are a prime target precisely because they are often less scrutinised than the web front end. API penetration testing focuses on the authorisation and logic flaws that dominate real-world API breaches.

What we test

We test authentication and authorisation between callers, object-level access control, rate limiting, input handling and the business flows an API exposes, across REST, GraphQL and internal service-to-service interfaces.

How we report it

Every finding is evidenced, explained in business terms and paired with a fix, then retested after remediation.

What we look for

• Broken object-level and function-level authorisation
• Excessive data exposure in API responses
• Missing rate limiting and resource controls
• Authentication weaknesses between services
• Business-logic flaws in the flows the API exposes