QA Testing Services for SaaS Startups: How Vervali Works
How Vervali tests a SaaS startup's product: what to test first, when to outsource, manual or automation, the monthly cost at published rates, and how the free pilot…
API Security Testing:
Auth, Injection and Rate Limits
Authentication, authorisation, injection, rate limiting and data exposure tested against the OWASP API Top 10, with retesting. We find the API flaws that let one user reach another user’s data, before an attacker or your largest customer does.
150+ clients
450+ projects
275+ engineers
15+ years
ISO/IEC 17025:2017Accredited testing laboratory
CMMI Maturity Level 3The process is written down and repeats
ISO 9001:2015Quality management
ISO/IEC 27001Information security
What We Test in Your APIs
Every OWASP API Top 10 risk on the endpoints you name, tested with real user roles, not a scanner alone.
Authentication
Weak login flows, tokens that never expire, broken refresh logic, and JWTs, OAuth tokens or API keys that can be forged or reused.
Authorisation Between Accounts
Broken object and function level access, where a second user can reach the first user’s records or admin paths. The flaw scanners miss most.
Injection
SQL, NoSQL and command injection, plus unsafe deserialisation, tested through parameters, headers and request bodies.
Data Exposure
Responses that return more than the caller should see, and mass assignment fields a client can set but never should.
Rate Limits and Abuse
Unthrottled brute force, account enumeration and business logic that a script can drain at scale.
Third-Party APIs
Payment gateways, social logins and cloud service integrations checked for data leakage, weak authentication and insecure endpoints.
A passing functional API test is not a security pass.
Free API AuditAPI Failures We Catch Early
Four problems that quietly turn into incidents, and how we stop each one.
Silent Failures
Breakages that slip past regression, caught with automated suites, contract tests and alerting.
Contract Violations
Schema drift controlled with strict validation, versioning and backward compatibility checks.
Token Failures
Auth breaking across services, fixed with automated auth flows and token lifecycle testing.
Staging Drift
Staging that behaves unlike production, closed with parity checks, config validation and shadow testing.
How We Test and Retest
People lead the testing, tools add breadth, and a retest proves every fix.
Scope and Permission
Endpoints, roles and environments agreed in writing. Staging or sandbox by default, production only with timing and throttling controls.
Manual and Automated
Burp Suite, OWASP ZAP, Postman, Fiddler and custom scripts, with fuzzing and replay of modified requests.
Risk-Ranked Report
Severity, proof of concept, affected endpoints and fix guidance for each finding, with a developer walkthrough.
Retest After Fixes
Every finding revalidated and marked closed or open. 100% coverage of agreed in-scope assets.
Five Recent Engagements
Security work anonymized by sector, including an API test on a fintech platform.
Bank · VAPT and audit evidence
Before: vulnerability noise was burying the work that mattered, fixes took over 40 days and audit preparation took five days. After: 68% less vulnerability noise, time to fix under 16 days, audit preparation down from 5 days to 5 hours, and high-risk findings closed 3.5 times faster.
68% less vulnerability noiseTime to fix 40+ days to under 16Audit prep 5 days to 5 hours3.5x high-risk closurePayments Platform
Infrastructure VAPT across the exposed surface of a digital recharge and payments platform, using Burp Suite, Metasploit, Tenable, OpenVAS and Wireshark.
Marine Technology
Web and infrastructure VAPT for a global marine technology organisation, tested against the OWASP Top 10 with risk-ranked findings.
Fintech Platform
API VAPT on a fintech platform, focused on authorisation between accounts, the flaw class automated tools most often miss.
SaaS Gaming
End-to-end VAPT across web, mobile, API, source code and infrastructure, with MobSF and Frida on mobile and one retest.
Why Teams Choose Vervali for API Security
Security testers and API engineers in one team, working inside your release cycle.
Security and QA Together
The same lab runs API test automation and API testing, so security checks slot into suites you already have.
Certified Process
ISO/IEC 27001 for our own information security, an ISO/IEC 17025 accredited lab and CMMI Level 3 process behind every report.
Fits Your Releases
Checks that run in your pipeline and a retest each release, with hours overlapping 9am to 1pm Eastern and delivery from India.
Frequently Asked Questions
Most engagements are priced at $25 to $49 an hour and quoted in tester-days once the scope is written down. For APIs, the price follows the number of endpoints, the user roles to test between, whether third-party integrations are included and whether you need an audit-ready report. A free API audit of one service is the usual starting point.
The main types are vulnerability assessment, penetration testing, static and dynamic application security testing, API security testing, mobile and network testing, cloud configuration review and compliance testing. API security testing focuses on authentication, authorisation between accounts, injection, rate limits and data exposure, mapped to the OWASP API Top 10, because APIs are now the largest attack surface in most products.
Pentesting is legal only with written permission from the owner of every system in scope. For APIs that includes any third-party service your endpoints call, such as a payment gateway, where the provider’s own testing policy applies. We agree endpoints, roles, environments and test windows in writing first, and test in staging or a sandbox unless you approve production.
For API security, the five most used are Burp Suite for intercepting and modifying requests, OWASP ZAP for automated scanning, Postman for building authenticated request collections, Fiddler for traffic analysis and custom fuzzing scripts for edge cases. Tools find the obvious issues. Manual testing between user roles finds the authorisation flaws behind the worst API breaches.
A penetration test should be quoted in tester-days against a written scope. At $25 to $49 an hour, a focused API test of one service with a few roles and a retest is a modest engagement, while a full test across web, mobile, APIs and infrastructure takes longer. Ask every vendor to quote the same scope so proposals are comparable.
Lists change every year and are often paid placements, so judge vendors on evidence. For API work, ask whether they test authorisation between real user roles, cover the OWASP API Top 10, share a sample report, include a retest and hold ISO/IEC 27001. Vervali meets each of these and will share a sample API report before you sign.
No. AI tools now help generate test cases, fuzz inputs and triage scanner output, which speeds up API testing. They still struggle with business logic, such as whether one customer should see another customer’s invoice. That judgement needs an experienced tester who understands your roles and data. We use AI where it saves time and verify every finding by hand.
It is an authorised attempt to break into a web application the way an attacker would, covering login, sessions, access control, injection and business logic. Most modern web apps are a front end over APIs, so a strong web application test always includes the APIs behind it. Every finding comes with proof, a recommended fix and a retest.
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