# API Security Testing for Fintech, SaaS, and Startup Backends

API security testing for startups covering access control, authentication, authorization, data exposure, abuse controls, and sensitive workflows.

Canonical page: https://security.kintsubyte.com/api-penetration-testing/

## Direct answer

### What is API security testing?

API security testing reviews endpoints, authentication, authorization, object access, data handling, rate limits, and business logic. It helps teams find issues that may not be visible in the user interface but can affect customer data or critical workflows.

## Highlights

- Access control and data exposure focus
- Useful for fintech, SaaS, and mobile apps
- Manual validation available where needed

## High-risk API areas

Kintsubyte focuses on broken object access, role bypass, excessive data exposure, weak rate limiting, token handling, and sensitive business workflows.

## Inputs that help

API documentation, endpoint collections, test accounts, role descriptions, and sensitive workflow notes make testing safer and more useful.

## Contact

Request an assessment at https://security.kintsubyte.com/ or email bolarinwa@kintsubyte.com.