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Secure Your APIs Against Modern Cyber Threats

API Penetration Testing & Security Assessment Services

Your APIs are your product's backbone, and they're often the easiest way in for an attacker. PlutoSec manually tests your REST, GraphQL, and SOAP APIs against the OWASP API Top 10 to find broken authorization, data exposure, and abuse paths before they reach production.

  • Certified API Penetration Testing Experts

    OSWE and OSCP certified testers specialize in REST, GraphQL and SOAP API security assessments.

  • Real World Testing Methodology

    We exploit authentication, authorization and logic flaws the way real API attackers do.

  • Clear Security Reporting

    Reports map findings to the OWASP API Top 10 with clear guidance for your development team.

  • Confidential & Secure

    Network access and test findings remain confidential under strict non disclosure terms.

API Penetration Testing & Security Assessment Services
About API Security Testing

Trusted API Penetration Testing Services

APIs power everything from mobile apps to partner integrations, which means a single weak endpoint can expose far more than a typical web page ever could. API security testing is a manual assessment of your endpoints, authentication, and authorization logic to find the flaws that perimeter tools like firewalls and gateways simply can't catch.

The most damaging API issues rarely show up in an automated scan. A user changing an order ID in a request and pulling up someone else's data, or a low privilege account reaching an admin only function, are logic problems that need a human tester thinking like an attacker. With APIs now driving most modern applications, testing them on their own, separate from the web or mobile front end, has become essential.

Comprehensive API Coverage 

Manual, Expert Led Testing

OWASP API Top 10 Alignmen

Actionable Remediation Guidance

Get Started

Ready to Strengthen Your Cybersecurity?

Protect your business with expert led security assessments, penetration testing, and managed security services. Talk to our specialists today.

Book a Free Consultation

Our Testing Methodology

  1. 1.

    Scoping and planning

    We review your API documentation, endpoints, and authentication model to define the test plan.

  2. 2.

    Endpoint discovery

    We map every accessible endpoint, including ones not listed in your documentation.

  3. 3.

    Vulnerability discovery

    We test each endpoint against the OWASP API Top 10 categories.

  4. 4.

    Controlled exploitation

    We validate findings like BOLA and broken authentication with real, working proof of concept.

  5. 5.

    Risk analysis

    We rate each finding by what an attacker could actually access or do, not just a severity label.

Why Choose Plutosec

Expert API Security Testing

Modern businesses rely on APIs to power applications, integrations, and digital services. PlutoSec helps organizations secure these critical assets through expert API security testing, vulnerability identification, and clear remediation guidance before attackers can exploit them.

API Security Experts

Our consultants specialize in identifying vulnerabilities across REST, SOAP, GraphQL, and modern API environments.

Real World Testing

We simulate attacker techniques to uncover authentication, authorization, and data exposure risks.

Actionable Remediation

Receive clear recommendations to fix vulnerabilities and strengthen API security controls.

Detailed Reporting

Comprehensive technical and executive reports provide complete visibility into security findings.

What We Cover

REST API Testing

The most common API architecture, tested for authentication, authorization, and input handling issues.

GraphQL Testing

We test query depth, introspection exposure, and batching abuse specific to GraphQL schemas.

SOAP and Legacy API Testing

We assess older API formats still running in many enterprise environments.

Mobile Backend API Testing

We test the APIs behind your iOS and Android apps, often the weakest link in mobile security.

Third Party and Partner API Testing 

We assess integrations with external vendors that connect into your environment.

Pre Release API Testing:

We test new endpoints before they go live in production.

Our Approach

  • API Discovery and Documentation Review
  • Authentication and Authorization Testing
  • Injection and Input Validation Testing
  • Business Logic and Workflow Abuse
  • Executive & Technical Reporting
  • Proof-of-Concept Exploitation
  • Risk Prioritization (CVSS)
  • Actionable Remediation Guidance

Tools We Use

  • Burp Suite Professional 
  • Postman
  • OWASP ZAP 
  • GraphQL Voyager and InQL
  • Arjun
  • Ffuf and Wfuzz
  • JWT Tool
  • Custom Python Scripts

Get Started

Ready to Strengthen Your Cybersecurity?

Protect your business with expert led security assessments, penetration testing, and managed security services. Talk to our specialists today.

Book a Free Consultation

Why API Security Testing Matters

Prevent Unauthorized Access

Identify authentication and authorization weaknesses before attackers can exploit them.

Protect Sensitive Data

Secure customer, financial, and business critical information from exposure and unauthorized access.

Reduce API Security Risks

Discover and remediate vulnerabilities that could lead to data breaches or service compromise.

CLIENT VOICES

What our clients say

5.0 / 5based on 20 verified reviews
GoodFirms

Their team conducted a thorough security assessment and penetration testing of our website, keeping us informed throughout the process. What really stood out was how they presented technical findings in straightforward language rather than jargon — our entire team could understand the vulnerabilities and risks without needing to decode complex terminology. The final report included practical remediation recommendations we could actually implement.

Their team conducted a thorough security assessment and penetration testing of our website, keeping us informed throughout the process. What really stood out was how they presented technical findings in straightforward language rather than jargon — our entire team could understand the vulnerabilities and risks without needing to decode complex terminology. The final report included practical remediation recommendations we could actually implement.

Rachel CohenOwner, Stant

Rachel CohenOwner, StantVerified
GoodFirms

Their team used a hands-on approach to identify vulnerabilities and security weaknesses that automated scans had missed, risks that could have exposed sensitive user information. Each finding was clearly explained, prioritized by severity, and paired with practical remediation recommendations. They remained available to answer questions and guide us through remediation.

Their team used a hands-on approach to identify vulnerabilities and security weaknesses that automated scans had missed, risks that could have exposed sensitive user information. Each finding was clearly explained, prioritized by severity, and paired with practical remediation recommendations. They remained available to answer questions and guide us through remediation.

Adam KowalskiOwner, Viva-mente

Adam KowalskiOwner, Viva-menteVerified
GoodFirms

Their team took the time to understand our sustainability platform, performed a thorough security assessment, and kept us informed throughout the engagement. The final report clearly prioritized each finding and included practical remediation steps that our technical team was able to implement without confusion, significantly improving our platform's security posture.

Their team took the time to understand our sustainability platform, performed a thorough security assessment, and kept us informed throughout the engagement. The final report clearly prioritized each finding and included practical remediation steps that our technical team was able to implement without confusion, significantly improving our platform's security posture.

Luca MorettiIT Security Manager, GEA.vite

Luca MorettiIT Security Manager, GEA.viteVerified
GoodFirms

Their team conducted a thorough penetration test and security assessment, identified vulnerabilities across our infrastructure, and provided clear, actionable steps to address them. Communication was professional and responsive throughout, and the final report was detailed yet easy to understand without unnecessary technical jargon. We especially appreciated their hands-on approach and meticulous attention to detail.

Their team conducted a thorough penetration test and security assessment, identified vulnerabilities across our infrastructure, and provided clear, actionable steps to address them. Communication was professional and responsive throughout, and the final report was detailed yet easy to understand without unnecessary technical jargon. We especially appreciated their hands-on approach and meticulous attention to detail.

Maya EllingtonIT Manager, Pescara Blu B&B

Maya EllingtonIT Manager, Pescara Blu B&BVerified
GoodFirms

Their team strengthened our cloud infrastructure, improved our access controls, and addressed security risks while providing ongoing monitoring. Communication was consistently clear, their support was responsive whenever we needed it, and their recommendations were practical and straightforward to implement.

Their team strengthened our cloud infrastructure, improved our access controls, and addressed security risks while providing ongoing monitoring. Communication was consistently clear, their support was responsive whenever we needed it, and their recommendations were practical and straightforward to implement.

Julian MercerIT and Cybersecurity Director, Novellowines

Julian MercerIT and Cybersecurity Director, NovellowinesVerified
GoodFirms

Their team uncovered vulnerabilities in our web application that we would have missed and explained each one clearly with practical remediation steps. They stayed responsive throughout the engagement and made the entire process straightforward.

Their team uncovered vulnerabilities in our web application that we would have missed and explained each one clearly with practical remediation steps. They stayed responsive throughout the engagement and made the entire process straightforward.

Wyatt CallahanCEO

Wyatt CallahanCEOVerified
GoodFirms

Their team continuously monitored our hospitality operations for vulnerabilities and threats, flagging potential issues early with clear recommendations before problems escalated. They were responsive and knowledgeable, making security guidance practical and actionable for our specific needs. They've become a trusted partner we rely on.

Their team continuously monitored our hospitality operations for vulnerabilities and threats, flagging potential issues early with clear recommendations before problems escalated. They were responsive and knowledgeable, making security guidance practical and actionable for our specific needs. They've become a trusted partner we rely on.

Riley EastwoodIT Manager, Crodadalago

Riley EastwoodIT Manager, CrodadalagoVerified
GoodFirms

Their team conducted a thorough penetration test and vulnerability assessment of our web environment, uncovering vulnerabilities we'd missed entirely. They communicated findings clearly, provided practical remediation guidance we could actually implement, and remained professional and responsive throughout the engagement.

Their team conducted a thorough penetration test and vulnerability assessment of our web environment, uncovering vulnerabilities we'd missed entirely. They communicated findings clearly, provided practical remediation guidance we could actually implement, and remained professional and responsive throughout the engagement.

Ava WhitmoreDirector of IT Operations, Ilpassaggio

Ava WhitmoreDirector of IT Operations, IlpassaggioVerified
GoodFirms

Working with PlutoSec was smooth and professional from start to finish. Their team manually tested our WordPress website, clearly explained each vulnerability they found, and gave us actionable steps to fix them, which made remediation straightforward instead of overwhelming. They were responsive to our questions and guided us through the process.

Working with PlutoSec was smooth and professional from start to finish. Their team manually tested our WordPress website, clearly explained each vulnerability they found, and gave us actionable steps to fix them, which made remediation straightforward instead of overwhelming. They were responsive to our questions and guided us through the process.

Sara MahmoudCTO, Andrea Baccolini

Sara MahmoudCTO, Andrea BaccoliniVerified
GoodFirms

Their team took time to understand our website, conducted a thorough security assessment and penetration test, then clearly explained each vulnerability they found. They provided practical remediation guidance we could actually implement to address the findings and strengthen our defenses. Communication was responsive throughout, and we felt confident in their technical knowledge and approach.

Their team took time to understand our website, conducted a thorough security assessment and penetration test, then clearly explained each vulnerability they found. They provided practical remediation guidance we could actually implement to address the findings and strengthen our defenses. Communication was responsive throughout, and we felt confident in their technical knowledge and approach.

Aisha RahmanIT Security Manager, Ilmiobeauty

Aisha RahmanIT Security Manager, IlmiobeautyVerified
GoodFirms

Their team conducted a detailed penetration test and vulnerability assessment, identifying security weaknesses and clearly explaining the business risks behind each finding. What impressed us most was their hands-on approach — they manually validated vulnerabilities rather than relying solely on automated scanning. Beyond the initial assessment, their managed security services helped us maintain stronger ongoing security.

Their team conducted a detailed penetration test and vulnerability assessment, identifying security weaknesses and clearly explaining the business risks behind each finding. What impressed us most was their hands-on approach — they manually validated vulnerabilities rather than relying solely on automated scanning. Beyond the initial assessment, their managed security services helped us maintain stronger ongoing security.

Zoya KhanCTO, FProgetti

Zoya KhanCTO, FProgettiVerified
GoodFirms

Their manual penetration testing caught vulnerabilities that automated scanners had missed, and their final report was detailed with practical remediation recommendations we could actually implement. The team demonstrated strong technical expertise and remained responsive throughout the project, answering our questions during remediation and completing everything on schedule.

Their manual penetration testing caught vulnerabilities that automated scanners had missed, and their final report was detailed with practical remediation recommendations we could actually implement. The team demonstrated strong technical expertise and remained responsive throughout the project, answering our questions during remediation and completing everything on schedule.

Adam Al-MasriIT Manager, Foggiait

Adam Al-MasriIT Manager, FoggiaitVerified
GoodFirms

PlutoSec provided proactive managed security, vulnerability management, and ongoing monitoring that meaningfully strengthened our security posture. The team was responsive and professional, addressing concerns quickly and giving us confidence that our systems and business data are properly protected.

PlutoSec provided proactive managed security, vulnerability management, and ongoing monitoring that meaningfully strengthened our security posture. The team was responsive and professional, addressing concerns quickly and giving us confidence that our systems and business data are properly protected.

AnonymousVerified client

AnonymousVerified clientVerified
GoodFirms

Their team helped us improve IT security, system reliability, and day-to-day support, while always being responsive when we needed assistance. We especially appreciated their practical approach, clear communication, and cybersecurity knowledge.

Their team helped us improve IT security, system reliability, and day-to-day support, while always being responsive when we needed assistance. We especially appreciated their practical approach, clear communication, and cybersecurity knowledge.

AnonymousVerified client

AnonymousVerified clientVerified
GoodFirms

Their cybersecurity team took time to understand our environment and performed a detailed penetration test, going beyond automated tools to manually validate findings and explain the potential business impact clearly. The final report was well-structured with practical remediation recommendations our team could easily follow.

Their cybersecurity team took time to understand our environment and performed a detailed penetration test, going beyond automated tools to manually validate findings and explain the potential business impact clearly. The final report was well-structured with practical remediation recommendations our team could easily follow.

AnonymousVerified client

AnonymousVerified clientVerified

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Frequently asked questions

Answers to the questions we hear most. Still unsure how it applies to your environment? Our engineers are happy to talk it through.

What's the difference between API testing and web application testing?
Web app testing focuses on the front end a user interacts with. API testing focuses on the back-end endpoints powering that app, mobile clients, and any integrations, which often have separate, less visible vulnerabilities.
Do you need our API documentation to test? 
It helps speed things up, but it's not required. We can also test undocumented or "shadow" endpoints we discover during the engagement.

What is BOLA and why does it matter so much? 
Broken object level authorization happens when an API doesn't properly check whether a user is allowed to access a specific record. It's the leading cause of real-world API breaches because it's easy to miss and easy to exploit.

Can you test GraphQL APIs? 
Yes. We test for introspection exposure, query depth abuse, batching attacks, and authorization issues specific to GraphQL schemas.
How often should we test our APIs? 
At least once a year, and after any major change to authentication, authorization logic, or new endpoint releases.
Will testing disrupt our production environment? 
We test in a controlled way and can work against staging environments where available, to avoid any impact on live traffic.

Get Started

Ready to See What Your Current Security Is Missing?

Book a short consultation with PlutoSec and get a practical view of where your current security model may be exposed.

Book Your Free Security Consultation