API Penetration Testing Services

Identify and remediate vulnerabilities within your APIs with our expert API penetration testing services.

Our team of UK-based certified ethical hackers will simulate real-world attacks to identify and exploit vulnerabilities to provide a qualitative assessment of your API security posture.

What Our API Testing Includes

Our API penetration testing service involves a thorough assessment of your APIs, including RESTful and SOAP APIs. We will perform both authenticated and unauthenticated testing to identify vulnerabilities such as parameter manipulation, broken object level authorisation, excessive data exposure, rate-limiting issues, function-level authorisation flaws, and security misconfigurations.

Authenticated & Unauthenticated Testing

Alongside unauthenticated testing we provide Authenticated testing, delving deeper into your APIs to identify authorisation and access control issues, as well as other vulnerabilities that may not be visible during unauthenticated testing.

This includes testing user roles, access control, permissions, and unauthorised access.

OWASP Top 10+ Coverage

Focused testing of your APIs to uncover logic flaws, data leakage vulnerabilities, and many other potential application vulnerabilities above and beyond the OWASP Top 10.

Detailed Reporting

We provide detailed executive and technical reports that include a summary of findings, technical details, and actionable recommendations for remediation.

Our reports are tailored to both technical and non-technical stakeholders, ensuring clarity and understanding.

Pricing

From

£2850

excl VAT

We offer straightforward packages for common requirements and flexible day-rate pricing for bespoke or complex work.

Our packages can provide price certainty and fast scheduling; bespoke engagements (from £950/day) are available to allow us to tailor resource and depth to match your risk profile. Final quotes are provided following a short scoping call and discussion of your requirements.

Starter API Test

For simple or single-endpoint APIs.

Ideal for:

Up to 20 endpoints
OWASP Top 10 API Coverage
Authentication, authorisation, token testing

Standard API Test

For typical SaaS APIs.

Ideal for:

Up to 100 endpoints
Complex authentication flows (OAuth2, JWT, refresh tokens)
Rate limiting & abuse testing
Business logic flaws
Full report & remediation testing

Advanced API Test

For critical or multi-service architectures.

Ideal for:

More than 100 endpoints
Multi-tenant logic testing
Fuzzing + extensive business logic modelling
Full report & remediation testing

Request a free quote

Our team are on hand to discuss your security requirements and provide an engagement scope that meets your needs.
Speak with our security team directly
Experts in providing thorough coverage
Professional services you can trust

Collaborative Vulnerability Remediation

Gain complementary access to the Attack Surface Center platform with your penetration test to manage your vulnerabilities, assets, and track remediation progress.

  • Asset Discovery & Vulnerability Management
  • Automated Vulnerability Scanning
  • Custom and AI-Powered Reporting
  • Risk Management
  • AWS, Slack, GitHub and many more Integrations