API Penetration Testing
Your API can work exactly as designed and still be exploitable. Canary Trap tests how your APIs enforce authorization, protect data, and behave under adversarial use across endpoints, roles, and integrations.
What we test, review, and validate.
Hands-on, senior-led testing supported by tools and threat intelligence, never replaced by them.
Outcome of this engagement
APIs rarely fail in obvious ways. The real risk often sits in authorization logic, data access, workflow abuse, and assumptions between systems. API Penetration Testing helps your team validate whether every user, token, tenant, and integration can access only what it should, and nothing more.
- Broken object-level authorization (BOLA/IDOR) and tenant isolation
- Function-level authorization and role boundaries
- Token scope, lifetime, and revocation
- Mass assignment, parameter pollution, batch abuse
- Rate limiting, replay, and brute-force resistance
- Workflow chaining across endpoints
- REST, GraphQL, and gRPC behaviour
- Data exposure, mass enumeration, and PII leakage
- SSRF, injection vectors, and unsafe handling of third-party API responses
API findings your engineering team can reproduce.
A penetration test is only valuable if the findings lead somewhere.
Canary Trap reports are written to support remediation, leadership visibility, compliance conversations, and customer or auditor requests.
API security should be proven at the behaviour layer.
A clean schema does not mean clean authorization. A documented endpoint does not mean safe data access.
This engagement gives your team a defensible view of how your APIs behave under adversarial use, including what was tested, what was validated, what creates real risk, and what should happen next.
A transparent process from scope to retesting.
Every API penetration test is scoped to your API architecture, authentication model, roles, integrations, documentation, and testing objectives.
We confirm API scope, authentication approach, user roles, test clients, documentation, rules of engagement, timing, contacts, and communication process.
Our testers identify, investigate, and validate exploitable weaknesses across endpoints, roles, authorization boundaries, data flows, and abuse cases.
We document findings with evidence, severity, business context, reproducible requests, and practical remediation guidance.
Your team addresses the findings with clear direction from the report and findings review.
We retest remediated findings within the defined window to validate that the risk has been addressed.
API testing led by people who understand abuse paths.
API Penetration Testing is often treated like documentation review plus a scanner pass. That is usually where the important findings get missed.
Canary Trap brings senior offensive security expertise, structured methodology, and practical reporting to help your team understand how your APIs behave when someone deliberately tries to break the rules.
Senior-led testing
Testing is led by experienced offensive security professionals, not handed off to junior scanner operators.
Authorization-focused validation
We test role boundaries, object-level access, function-level authorization, tenant isolation, token handling, and scope enforcement.
Abuse-case thinking
We look for valid API behaviour that can be misused, including mass assignment, replay, rate-limit bypass, workflow chaining, enumeration, and data exposure.
Protocol-aware testing
Testing adapts to the API style in scope, including REST, GraphQL, gRPC, and the supporting authentication and integration patterns.
Practical reporting
Findings include the technical detail needed for remediation and the business context needed for leadership, compliance, and customer conversations.
Project management
Every engagement includes clear communication, defined expectations, and project management throughout the testing lifecycle.
Retesting and validation
Retesting helps confirm that remediated findings have actually been addressed, not just marked complete.
Trust signals
Canary Trap is SOC 2 Type II certified, maintains an NPS above 95, and specializes in offensive security testing.
API risk rarely exists in isolation.
Most APIs sit inside a broader application, cloud, identity, and integration ecosystem. These are common pairings with API Penetration Testing.
API penetration testing questions, answered plainly.
API penetration testing evaluates whether an application programming interface can be abused by an attacker or unauthorized user. It tests authorization, authentication, data exposure, business logic, rate limiting, protocol behaviour, and endpoint abuse across REST, GraphQL, gRPC, and other API styles.
Canary Trap combines manual API testing, tooling, abuse-case analysis, reporting, and retesting to help teams identify and reduce API security risk.
Yes. Canary Trap tests REST, GraphQL, and gRPC APIs, and adapts the methodology to the protocol and architecture in scope.
For GraphQL, testing may include introspection, query depth, authorization, data exposure, batching, and resolver behaviour.
API documentation is helpful, but not always required.
OpenAPI, Swagger, Postman collections, GraphQL schemas, or endpoint documentation allow for more comprehensive testing. Without documentation, Canary Trap can perform discovery during testing, though coverage may depend on authentication, application behaviour, and accessible traffic.
Scope varies by environment, but API penetration testing may include authorization, authentication, object-level access, function-level access, tenant isolation, token handling, rate limiting, replay resistance, input validation, data exposure, mass assignment, parameter pollution, enumeration, GraphQL behaviour, gRPC behaviour, SSRF, and injection vectors.
Canary Trap works with your team to set up role-based test users, clients, tokens, scopes, or credentials. This allows testers to validate cross-role, cross-tenant, and privilege-boundary issues safely.
Yes. APIs used by mobile applications can be tested as part of API Penetration Testing or as part of a broader Application Penetration Testing engagement.
Yes. Findings can be mapped to OWASP API Security Top 10 categories where applicable.
The mapping is useful for compliance, reporting, and prioritization, but it should not be the full testing strategy. API risk often depends on business logic, authorization intent, and integration context.
Most API penetration testing engagements run one to three weeks of active testing, depending on endpoint count, authentication models, number of roles, API complexity, documentation quality, and testing objectives.
API penetration testing cost depends on scope, including the number of APIs, endpoints, roles, authentication flows, integrations, environments, and protocol types involved.
Canary Trap prices from scope, not from a generic rate card.
Yes. API Penetration Testing can support common compliance and customer assurance requirements. Canary Trap reports provide technical remediation detail while also supporting audit, leadership, and customer conversations.
Yes. Retesting of remediated findings is included within the defined engagement window after report delivery.
An API security scan identifies known patterns, misconfigurations, or potential issues. API penetration testing validates how the API behaves under adversarial use, including role boundaries, authorization logic, workflow abuse, data exposure, and chained endpoint behaviour.
Manual testing validates authorization, workflow, and business-rule assumptions that automation does not understand.
Scoping typically requires API documentation where available, authentication details, user roles, test credentials, environments, endpoint counts, rate-limit considerations, testing objectives, technical contacts, and rules of engagement.
A scoping call is used to confirm the right testing approach before work begins.
Canary Trap reviews the findings with your team, explains the most important risks, provides remediation guidance, and retests remediated findings within the defined window.
Ready to scope your API Penetration Testing?
A short scoping call is enough to align on your APIs, authentication model, documentation, roles, timing, testing objectives, and the right next step.
Working against a launch, audit, renewal, or integration deadline? Tell us the date and we’ll work backwards from it.
