Cybersecurity assessment services

API security testing

End-to-end testing of REST, GraphQL, and gRPC APIs for authentication, authorisation, and data exposure weaknesses.

About the service

Service Description

API security testing is a focused review of your REST, GraphQL, and gRPC APIs for authentication, authorisation, input validation, and rate-limiting flaws — the issues that lead to data theft, account takeover, and BOLA-style attacks.

Why this service matters

The business case

APIs are the connective tissue of modern applications and the most common initial access path in current incidents. Generic web application testing is not enough — APIs need API-specific testing and tooling.

What is delivered

Assessment deliverables

Each assessment produces a working set of artefacts that the customer's engineering, security, and leadership teams can act on. The exact list is calibrated to the scope and framework alignment.

  • OWASP API Security Top 10 coverage
  • Authentication, authorisation, and rate limiting review
  • Schema and data exposure validation
  • Developer remediation guidance and retesting

Delivery method

Axpert Service Delivery Model

Endpoint discovery and inventory, threat modelling against the OWASP API Security Top 10, manual plus tool-assisted testing of authentication, authorisation, and data-handling flows, and a developer-friendly report with reproductions.

Methodology alignment

Standards and frameworks

  • OWASP API Security Top 10
  • OWASP ASVS
  • NIST SP 800-53 SC-8
  • OAuth 2.0 Security Best Current Practice
  • PCI DSS v4.0 (6.4.x)

Next step

Ready to scope API security testing?

Use the contact or requirement form to tell AxpertCyber the systems, locations, and stakeholders involved, and the right engagement model can be proposed.