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    API Penetration Testing

    APIs power mobile apps, partner integrations, and microservices—and they are a prime target for abuse. Budget Security delivers manual API pentesting focused on authentication, authorization, input handling, and business-logic risks that scanners often miss.

    We test how tokens are issued and validated, how object-level authorization holds up under real requests, and how edge cases in parameters and workflows can be chained into impactful issues. Coverage is tailored to your API surface and documentation available (OpenAPI/Swagger, Postman collections, etc.).

    Book and scope online, see pricing upfront, and track validated findings as they are discovered—then export compliance-ready reporting and retest fixes from your dashboard.

    How we test APIs

    Testing blends structured manual techniques with automation helpers to explore endpoints, authentication flows, and data access patterns. We prioritize issues with realistic exploitability and business impact, not noisy theoretical findings.

    What is included

    • Manual testing by OSCP certified penetration testers
    • Deep focus on authn/authz, injection, and abuse scenarios
    • Clear reports with reproduction steps and remediation guidance
    • Compliance-oriented documentation for SOC 2, ISO 27001, and NIS 2 programs
    • Self-serve booking and one-click retesting after remediation
    Request early accessPenetration test cost calculator

    API Penetration Testing — FAQ

    What types of APIs can you test?
    We commonly test REST/JSON APIs and similar modern API styles. Share your API documentation and authentication model so testing matches how your product actually works.
    Can you test GraphQL or gRPC?
    Coverage depends on your stack and scope. During onboarding, we align on interfaces, auth mechanisms, and the best way to exercise your endpoints safely and thoroughly.
    Do you need API documentation?
    Documentation speeds up testing and improves coverage, but it is not always required. Grey box and white box approaches can significantly improve depth when specs and samples are available.
    How do you handle authentication in testing?
    We test token issuance, refresh flows, scopes/roles, and enforcement on protected endpoints. You provide test accounts and credentials according to your rules of engagement.
    What about rate limiting and abuse cases?
    Where in scope, we evaluate weaknesses that enable abuse—such as excessive data exposure, broken object-level authorization, and flawed business rules—aligned to realistic attacker goals.
    How do I get a price estimate?
    Use our penetration test cost calculator. Pricing typically scales with endpoint count, authentication complexity, and testing approach.