Reliable API Testing For Modern Systems

API Penetration Testing

Application programming interfaces (APIs) are the backbone of modern software, powering web applications, mobile apps, and integrations between systems.

Our API testing service ensures your APIs work securely, reliably, and efficiently, giving you confidence that your business operations and customer experiences run smoothly.

By testing at the API level, we help you detect issues earlier, strengthen your security, and save time compared to only testing at the user interface stage.

Good Things To Know

Ensures secure communication between systems
Detects problems early, before they impact users
Validates security, authentication, and data handling
Faster and more efficient than testing only at the user interface level
Scales easily with automated test coverage

API Penetration Testing FAQs

What is API Penetration Testing?

API Penetration Testing focuses on identifying vulnerabilities within your application programming interfaces.

It simulates real-world attack scenarios to uncover weaknesses in authentication, authorisation, data handling, and business logic.

Why is API Penetration Testing important?

APIs often serve as the main gateway to a company’s data and services, making them a prime target for attackers.

Weak authentication, poor input validation, or misconfigured permissions can expose sensitive information or allow unauthorised access.

API penetration testing identifies these weaknesses before they can be exploited, helping you protect customer data, maintain business continuity, and meet compliance standards.

Who benefits from API Penetration Testing?

Any company that develops, integrates, or relies on APIs can benefit from API penetration testing.

This includes software companies, financial institutions, healthcare providers, e-commerce platforms, and enterprises using cloud or microservice architectures.

When should API Penetration Testing be performed?

API penetration testing should be performed during key stages of the development and deployment lifecycle, ideally before an API goes live and after any major code updates, integrations, or infrastructure changes.

Regular testing, such as quarterly or after significant releases, helps maintain ongoing security as systems evolve.

How is API Penetration Testing conducted?

We use a combination of automated and manual techniques.

Automated testing checks endpoints quickly and repeatedly, while manual testing helps identify complex issues such as security weaknesses or unusual behaviours.

What types of APIs can be penetration tested?

We can test REST, SOAP, GraphQL, microservices, and other common API technologies.

What support do I get during the API Penetration Test?

You will have direct and dedicated access to our consultants throughout the engagement.

We provide daily progress calls, immediate alerts for any findings above an agreed CVSS severity level, and ongoing communication to minimise disruption to your business operations.

Our team conducts all work with professionalism and discretion, and we are available to answer any questions you may have during (and after) the test.

What do I receive after the API Penetration Test?

You will receive a comprehensive, prioritised report detailing all identified vulnerabilities, misconfigurations, and security risks. Each finding is accompanied by practical remediation guidance to help your technical teams implement fixes effectively.

The report is concise and bloat-free, focusing on the essentials to provide clear, actionable insight for both technical staff and management. To aid understanding, where practical, we supplement the report with video demonstrations of exploits, showing your team exactly how vulnerabilities were identified and exploited.

If required, a debrief session is included to review the results and discuss next steps.

Is API Penetration Testing cost-effective?

Yes.

It is more efficient to find and fix problems at the API level rather than waiting for them to appear later in the user interface. This reduces the cost of development and avoids expensive issues in live environments.

Regular penetration testing also helps avoid costly incidents, supports compliance, and demonstrates due diligence to clients and regulators.

Get In Touch

Our team is available to help you with your next Penetration Test, Cloud Security Audit, or Cyber Essentials Assessment.

Whether you are launching a new platform, expanding an existing service, reviewing your defences, or strengthening your security posture, we can provide a tailored engagement that meets your specific needs and scope.

Contact us today to discuss your requirements and see how we can help you protect your business with confidence.

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Call us on 0333 339 7246

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