API penetration testing

APIs carry the data and logic behind modern applications, and they are a favourite target precisely because they get less scrutiny than the web front end. API testing concentrates on the authorisation and logic flaws that dominate real-world API breaches.

What we test

We probe how callers are authenticated and authorised, object-level access control, rate limiting, input handling and the business flows the API exposes, across REST, GraphQL and internal service-to-service interfaces.

How we report it

Each issue is evidenced, put in business terms and matched with a fix, and we retest it after you remediate.

What we look for

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