Break it first · API Pentesting
Your API is your product's real attack surface
Modern apps are thin clients over APIs, and that's where attackers go. We test REST, GraphQL and gRPC endpoints for broken object and function-level authorisation, mass assignment, excessive data exposure and abuse of business flows.
Outcomes
What you walk away with
Authorisation flaws found across every role and tenant
Sensitive data exposure mapped and closed
Rate-limiting and abuse controls validated
Concrete fixes for each endpoint
Coverage
What's in scope
What we test
- BOLA / IDOR and function-level authorisation
- Mass assignment and excessive data exposure
- JWT, OAuth 2.0 and API key handling
- GraphQL introspection, batching and depth attacks
Inputs we use
- OpenAPI / Swagger or GraphQL schemas
- Postman collections or HAR files
- Test accounts for each role
- Documentation of business flows
Deliverables
- Endpoint-level findings with request/response evidence
- Authorisation matrix showing what each role can reach
- Remediation guidance and retest
Standards & frameworks
- OWASP API Security Top 10
- OWASP WSTG
- CVSS v4
Ideal for
- API-first and B2B SaaS companies
- Fintech, healthtech and other data-heavy platforms
- Teams exposing public or partner APIs
FAQ
API Pentesting questions
Can you test an API without documentation?
Yes. We can reverse-engineer it from the client app, though a spec lets us cover more ground in less time.
Related
Often combined with
Web Application Pentesting
AI-native, expert-verified testing of your web apps, from auth bypass to business-logic abuse.
Mobile App Pentesting
Android and iOS testing of the app, its storage, and the APIs behind it.
Cloud Security & Pentesting
AWS, Azure and GCP configuration review and attack-path analysis.
Ready to talk about api pentesting?
Tell us what you're building. In a free 30-minute scoping call we'll map your risks and recommend the right engagement, whether you need a pentest, a threat model or an AI security review.