API Security Testing Services

Hire certified ethical hackers to test your REST, GraphQL, and internal APIs against real-world attack techniques — before attackers exploit them. Every engagement is authorized, NDA-protected, and mapped to the OWASP API Security Top 10.

✔ OSCP / OSWE Certified Team ✔ NDA on Every Project ✔ Written Authorization Required ✔ 24–48h Response Time

What Is API Security Testing?

API security testing is an authorized, simulated attack against your REST, GraphQL, or internal APIs, designed to uncover vulnerabilities in authentication, authorization, and data handling before attackers exploit them. As more applications move business logic into APIs — mobile backends, microservices, partner integrations — APIs have become one of the most common attack surfaces, and require testing methodology distinct from traditional web application testing.

What’s Included

• Authentication & Authorization Testing: Broken object-level authorization (BOLA), broken function-level authorization, and token handling flaws.
• Injection Testing: SQL injection, NoSQL injection, and command injection through API parameters.
• Data Exposure Testing: Excessive data returned by endpoints, and improper filtering of sensitive fields.
• Rate Limiting & Resource Testing: Missing rate limits that could enable abuse or denial of service.
• Business Logic Testing: Abuse cases specific to your API’s workflows and third-party integrations.
• GraphQL-Specific Testing: Introspection exposure, query depth abuse, and batching attacks (where applicable).

Our Process

1. Scoping Call: We define which API endpoints, environments, and authentication methods are in scope, and obtain written authorization.
2. Reconnaissance: We map your API’s attack surface — endpoints, parameters, and data flows.
3. Manual & Automated Testing: Our team combines API-specific tooling with hands-on exploitation attempts against OWASP API Security Top 10 categories.
4. Validation: Every finding is manually verified to eliminate false positives.
5. Reporting: You receive a prioritized report with severity ratings, proof-of-concept evidence, and remediation guidance.
6. Retesting: Once fixes are deployed, we confirm the vulnerabilities are resolved at no extra cost.

Who This Service Is For

• Mobile app backends exposing APIs to iOS and Android clients.
• Microservices architectures with internal service-to-service APIs.
• Companies with partner or third-party integrations relying on API access.
• SaaS platforms offering a public API to customers.

What You’ll Receive

An API vulnerability report aligned with the OWASP API Security Top 10, including severity ratings, proof-of-concept evidence, and remediation steps your development team can act on directly. If your API sits behind a broader web application, pair this with our Web Application Penetration Testing service for full-stack coverage.

Frequently Asked Questions

Do you test both REST and GraphQL APIs?

Yes — our methodology covers REST, GraphQL, and internal/private APIs, each with its own testing techniques and known vulnerability classes.

Will testing affect our production API?

Testing windows and techniques are agreed upon in advance, and we can test against staging or sandbox environments when available to avoid any disruption.

Do you need API documentation to test?

Documentation (like an OpenAPI/Swagger spec) speeds up testing and improves coverage, but we can also test undocumented or partially documented APIs through discovery techniques.

How long does an API security test take?

Most engagements take 1–2 weeks depending on the number of endpoints and complexity of business logic, with a full report delivered at the end.