API Security Testing.
We go after the endpoints that quietly move your real data, including the ones missing from your documentation.
The attack surface & hardware challenge
Offensive reverse-engineering down to the physical silicon, flash extraction, and protocol buses to uncover deep architectural flaws.
The API Security Challenge
APIs have become the backbone of modern digital ecosystems, enabling seamless integration between applications, services, and platforms. As organizations increasingly rely on APIs to drive business operations and deliver services, these critical interfaces have become prime targets for cyber attackers. At Dellon, we understand that API security extends far beyond individual endpoints to safeguard your entire digital infrastructure, data flows, and business operations.
What the assessment covers
Exhaustive penetration testing vectors executed across hardware, firmware, interface buses, and logic layers.
REST API Testing
Comprehensive testing of RESTful APIs including endpoint security, HTTP method validation, parameter manipulation, and response analysis for vulnerabilities.
GraphQL Security
Advanced testing of GraphQL APIs including query depth analysis, schema introspection, authorization bypasses, and mutation vulnerabilities.
Authentication Testing
Testing API authentication mechanisms including JWT tokens, OAuth 2.0 flows, API keys, and custom authentication implementations for bypass opportunities.
Business Logic Testing
Analysis of API business logic, workflow validation, transaction processing, and state management for logic flaws and abuse opportunities.
How we run the engagement
Structured four-phase offensive methodology engineered to minimize engineering friction and deliver clear, actionable findings.
API Discovery & Mapping
Comprehensive discovery and mapping of all API endpoints, documentation analysis, and attack surface identification to understand the complete API ecosystem.
Vulnerability Assessment
Systematic testing using automated scanners, manual testing techniques, and custom exploit development to identify security weaknesses across all API endpoints.
Exploitation & Validation
Controlled exploitation of identified vulnerabilities to demonstrate real-world impact, assess data exposure risks, and validate security control effectiveness.
Reporting & Remediation
Detailed findings report with step-by-step exploitation details, risk assessment, and prioritized remediation recommendations for immediate API security improvements.
Why engineering teams choose this assessment
Evidence-based vulnerability research designed to unblock compliance, protect launch timelines, and prevent post-shipment recalls.
API Technology Expertise
Deep understanding of REST, GraphQL, SOAP, gRPC, and emerging API technologies across various programming languages, frameworks, and cloud platforms.
Comprehensive Testing
Holistic approach covering authentication, authorization, data validation, business logic, rate limiting, and infrastructure security for complete API protection.
Practical Solutions
Actionable recommendations for real-world API security improvements that can be implemented immediately with clear code examples and configuration guidance.
Proven Track Record
Successfully tested 500+ APIs and identified 300+ critical vulnerabilities across fintech, healthcare, e-commerce, and enterprise API ecosystems.
Cutting-Edge Tools
Advanced API security testing frameworks, custom exploitation tools, and proprietary methodologies for identifying complex vulnerabilities in modern APIs.
24/7 Support
Round-the-clock security consultation and emergency response for critical API security incidents. We're always available when your API security matters most.
Also in Software, Cloud & Apps
Teams booking API Security Testing frequently combine it with these adjacent assessments for end-to-end assurance.
Web Application Testing
We test your web application the way an attacker uses it, uncovering the subtle business logic flaws scanners consistently miss.
Explore assessment
Mobile Application Testing
We test your iOS and Android apps and the backends they talk to, including what the app leaves behind on a lost phone.
Explore assessment
Cloud Security Testing
We stress-test your half of the cloud shared-responsibility model, auditing identity, permissions, configuration and gaps between services.
Explore assessmentReady to scope your API Security Testing?
Tell us about your hardware architecture, target deployment dates, or compliance deadlines. We will outline the exact test plan, timeline, and deliverables.