Protect the interfaces that connect your business.
Deep testing for REST, GraphQL, SOAP, and internal APIs, focused on authorization, data exposure, abuse paths, and real-world attacker behavior.
What is API Security Testing?
Deep testing for REST, GraphQL, SOAP, and internal APIs, focused on authorization, data exposure, abuse paths, and real-world attacker behavior.
Hackstack Security delivers it as a scoped, agentic engagement: AI agents on local and client-approved API models expand coverage, our specialists test the logic and attack chains agents miss, and every finding is validated by a human, explained in business terms, and retested after you fix it.
- AI agents plus manual testers
- Human-validated findings only
- Retest and closure status included
What outcomes should you expect?
Every engagement is designed around the risk your team needs to understand and the action it needs to take.
Reduced API attack surface
Validated authorization controls
Actionable engineering guidance
What does API security testing cover?
Proven methodology plus the judgment needed to uncover context-specific risk.
REST and GraphQL testing
BOLA and BFLA validation
Authentication and token review
Rate-limit and abuse testing
Sensitive data exposure review
API inventory guidance
When should you run API security testing?
Test before a finding turns into a release delay, a customer escalation, or an incident.
Before a major launch, migration, or architecture change
When enterprise customers or partners request security evidence
After meaningful changes to identity, data, integrations, or infrastructure
When your team needs an independent view of real-world risk
Which questions do we test?
Frameworks support consistent coverage. The assessment remains driven by your architecture, trust boundaries, threat model, and business workflows.
- Can object identifiers be changed to access another user’s data?
- Can hidden properties or privileged functions be read or modified?
- Can sensitive business flows be automated or abused at scale?
- Can third-party API responses trigger unsafe behavior in the consuming service?
- Reproducible request, response, configuration, or workflow evidence
- Attack-path narrative connecting technical behavior to business impact
- Control-focused remediation guidance and verification criteria
How does Hackstack Security test?
Testing is scoped, evidence-led, and designed to reduce risk without creating unnecessary disruption.
Context first
We learn the system, users, trust boundaries, and business objectives before testing begins.
Expert-led testing
Automation supports coverage. Human analysis finds the issues that depend on judgment and context.
Clear prioritization
Findings are ranked by exploitability, impact, and what matters to your organization.
Remediation partnership
We stay engaged through fixes, answer engineering questions, and validate closure.
What will you receive?
Reports are written for the people who need to make decisions, fix issues, and demonstrate improvement.
Executive summary and risk narrative
Detailed technical findings
Risk rating and prioritization
Exploit evidence and reproduction steps
Developer-friendly remediation guidance
Retest status and closure validation
API Security questions, answered.
Still unsure? Ask us directly and we will reply with a proposed scope.
What does API Security Testing include?
It covers REST and GraphQL testing, BOLA and BFLA validation, authentication and token review, rate-limit and abuse testing, sensitive data exposure review, and API inventory guidance. Each engagement is scoped to your environment and ends with validated findings, remediation guidance, and a readout.
What will we receive at the end?
You receive an executive summary, detailed technical findings with exploit evidence and reproduction steps, risk ratings, developer-ready remediation guidance, and retest status. The goal is reduced API attack surface, validated authorization controls, actionable engineering guidance.
Which frameworks guide the testing?
Coverage is aligned with OWASP API Security Top 10 2023, OWASP REST Security Cheat Sheet, OWASP GraphQL Cheat Sheet, then shaped by your architecture, trust boundaries, and business workflows.
Do you use AI agents or only manual testing?
Both. AI agents running on self-hosted local models, and on API-based models when you approve them, handle reconnaissance, surface mapping, fuzzing, and hypothesis generation, while our specialists test business logic and chained attacks manually. Every result is validated by a practitioner before it is reported.
Can you support remediation and retesting?
Yes. We walk your engineers through findings, answer implementation questions, and retest agreed fixes to document final status for stakeholders and auditors.
What if the test finds no High or Critical vulnerabilities?
This assessment is eligible for our guarantee: if the final report contains no validated High or Critical finding, you are not charged the audit fee, subject to the guarantee terms agreed in your statement of work.
Ready to strengthen your API security?
Share your targets, deadline, and any compliance driver. We reply with a proposed scope, test approach, and timeline. There is no obligation.