API Penetration Testing (VAPT) Service
in Singapore

We highly recommend a grey box approach for API testing to get the maximum value for your budget:

• Black Box Testing: Engineers simulate an outsider with zero prior knowledge. They must guess hidden endpoint URLs and parameter names from scratch, which often results in a surface-level assessment.

• Grey Box Testing: You provide our engineers with API documentation (like Swagger/OpenAPI specs or Postman collections) and test accounts with different privilege levels. This eliminates time-consuming guesswork, allowing our team to immediately jump into deep, context-aware testing.

Not necessarily. Attempting to deeply pentest hundreds of endpoints simultaneously is rarely practical. Instead, we recommend a risk-based, tiered scoping approach to maximize your budget:

• Tier 1: High Risk (Deep Manual Pentest): Public-facing APIs, authentication gateways, and endpoints handling sensitive data (PII) or financial transactions.

• Tier 2: Medium Risk (Targeted Assessment): Partner-facing APIs and critical internal microservices. We run focused, time-boxed testing on their primary logic paths.

• Tier 3: Low Risk (Automated Scanning): Internal, read-only, or non-sensitive APIs covered via automated vulnerability scanning to catch low-hanging fruit.

A penetration test is not a QA exercise, and its coverage is determined by the agreed scope, objectives and testing depth. While APIs can be tested as part of a Web or Mobile VAPT, not every API endpoint or security scenario may receive the same level of attention.

If you want greater assurance that your APIs are adequately tested, particularly those handling sensitive data or critical business functions, a dedicated API penetration test targeting the relevant endpoints is recommended.

Yes, our testing methodology is  guided by the OWASP API Security Top 10 framework. We focus our assessments on the most critical, high-prevalence vulnerabilities and logic flaws within this standard that pose the greatest risk to your business

No. We prioritise operational stability throughout the engagement. During the initial scoping phase, we define clear rules of engagement and agree on the testing approach. Wherever possible, testing should be conducted in a staging or UAT environment that closely mirrors production.

If testing must be performed in production, we use controlled, non-destructive payloads and coordinate closely with your  team to minimise operational risk and avoid service disruption. We also recommend performing a backup before testing begins as a precautionary measure.

To prevent unintended impact, all testing is performed only against the provided test accounts. We do not access or modify other user accounts.

Note: DDoS testing, social engineering and any other disruptive attack techniques are out of scope.

Our report consists of:

1. Executive Summary
   • Overview of assessment
   • Findings categorized by OWASP API Top 10
   • Attestation on areas you have done well
2. Risk Register
   • Findings tracker
3. Engagement scope
   • Scope of work, methodology and risk model used
4. Detailed Findings
   • Issue details and background
   • Issue remediation
   • Attestation