Top 10 Best API Penetration Testing Companies In 2025

1. Salt Security

Salt Security offers an AI-driven API security platform that provides continuous discovery and protection.

While it isn’t a traditional pen-testing company, its platform continuously monitors API traffic to automatically detect and alert on vulnerabilities and malicious behavior, including those related to business logic.

This makes it a great complement to a manual pen-test.

Best For:

Companies that want continuous, real-time API security monitoring and protection.

Why You Want to Buy It:

Salt’s platform provides unparalleled visibility into your API ecosystem and helps you find vulnerabilities automatically before they can be exploited.

It is the perfect solution for teams that need to continuously manage their API attack surface.

Try Salt Security here → Salt Security Official Website

2. RedBot Security

RedBot Security is a specialist in penetration testing with a focus on a hands-on, deep-dive methodology.

Their senior-level security engineers perform manual API testing that goes beyond automated scanning to uncover complex vulnerabilities and business logic flaws.

They offer a customized approach tailored to a company’s unique infrastructure and risks.

Best For:

Organizations that require a deep, hands-on, and highly customized API penetration test from a boutique firm with elite expertise.

Why You Want to Buy It:

RedBot’s focus on manual, expert-led testing ensures that they find vulnerabilities that automated tools and less-experienced testers would miss.

Their reports are highly detailed and provide actionable, strategic recommendations.

Try RedBot Security here → RedBot Security Official Website

3. Rhino Security Labs

Rhino Security Labs is a well-respected offensive security company known for its expertise in cloud and red team operations.

Their API penetration testing services are a core part of their offerings, leveraging their extensive knowledge of real-world attack techniques.

They focus on finding exploitable vulnerabilities by mimicking the actions of a sophisticated threat actor.

Best For:

Companies with complex cloud environments that need an API penetration test from a team with a strong red team and cloud security background.

Why You Want to Buy It:

Rhino’s red team mindset allows them to go beyond standard checklists and uncover multi-stage attack paths that chain together API vulnerabilities with other infrastructure weaknesses.

Try Rhino Security Labs here → Rhino Security Labs Official Website

4. NetSPI

NetSPI is a leading provider of enterprise penetration testing services.

Their API penetration testing is a key service, leveraging their proprietary Resolve™ platform and a team of over 300 in-house testers.

They provide a transparent, programmatic approach to testing, with real-time updates and clear reporting on a unified platform.

Best For:

Large, complex organizations that need a highly repeatable, enterprise-grade API penetration testing program with clear visibility and reporting.

Why You Want to Buy It:

NetSPI’s combination of a robust platform and a large, skilled team ensures consistent quality and scalability.

The Resolve™ platform makes it easy to track vulnerabilities and manage the entire engagement, from scoping to remediation.

Try NetSPI here → NetSPI Official Website

5. BreachLock

BreachLock offers a Continuous Penetration Testing model that includes API testing.

Their approach combines an AI-powered platform with a global team of certified ethical hackers.

The platform automates asset discovery and initial scanning, while the human testers focus on validating and exploiting complex vulnerabilities, providing a highly efficient and scalable solution.

Best For:

Companies that need an agile and scalable API pen-testing solution that provides continuous security validation and integrates with existing DevSecOps workflows.

Why You Want to Buy It:

BreachLock’s hybrid model provides the speed of automation with the depth of human expertise.

Their continuous testing and transparent platform make it easy to manage your security posture in a fast-paced development environment.

Try BreachLock here → BreachLock Official Website

6. Cobalt

Cobalt is the pioneer of Penetration Testing as a Service (PTaaS).

Their platform connects you with a global community of highly vetted ethical hackers for on-demand API penetration tests.

The platform streamlines the entire process, from scoping and scheduling to real-time collaboration with testers and getting instant access to findings.

Best For:

DevSecOps teams that need to integrate on-demand API pen-testing into their development lifecycle with seamless, real-time collaboration.

Why You Want to Buy It:

Cobalt’s PTaaS model solves the traditional pain points of pen-testing with its speed and transparency. It allows for quick, repeatable tests that can be scheduled to align with your release cycles.

Try Cobalt here → Cobalt Official Website

7. Synack

Synack offers a crowdsourced security platform that provides on-demand API penetration testing.

Their Synack Red Team (SRT), a global network of elite security researchers, works on a pay-for-results basis.

The platform uses AI to handle initial scanning and reconnaissance, allowing the human testers to focus on finding complex, high-impact vulnerabilities.

Best For:

Companies that need a scalable, on-demand pen-testing solution with access to a global pool of elite security researchers.

Why You Want to Buy It:

Synack’s crowdsourced model provides a level of diversity and expertise that a traditional single team can’t match.

Their platform manages the entire engagement, from asset discovery to reporting, making it a highly efficient solution for continuous security validation.

Try Synack here → Synack Official Website

8. Pentera

Pentera is an automated security validation platform that simulates real-world attacks.

While it primarily focuses on automated penetration testing, its platform is designed to mimic the actions of a human attacker, including exploiting vulnerabilities in APIs.

This allows for continuous, automated security validation and can quickly identify exploitable weaknesses in your APIs.

Best For:

Organizations that want to continuously and automatically validate the security of their APIs and other IT assets without relying on a manual, project-based approach.

Why You Want to Buy It:

Pentera automates the entire pen-testing process, providing a scalable and repeatable way to ensure your security controls are working effectively. It helps eliminate security gaps in between manual tests.

Try Pentera here → Pentera Official Website

9. Secureworks

Secureworks’ penetration testing services are backed by its elite Counter Threat Unit (CTU) Research Team.

Their testers leverage proprietary threat intelligence to simulate real-world attacks on APIs.

They go beyond simple vulnerability scanning to demonstrate how an attacker would chain together multiple flaws to compromise an API.

Best For:

Large, global enterprises that need a highly experienced, intelligence-driven API penetration testing team.

Why You Want to Buy It:

Secureworks’ a-la-carte service gives you access to a team with unmatched threat intelligence.

Their reports are customized for both technical and leadership audiences, making it easy to understand and act on the findings.

Try Secureworks here → Secureworks Official Website

10. Rapid7

Rapid7’s penetration testing services are a core part of its security portfolio.

Their testers have deep expertise and a unique connection to the Metasploit Project, which helps them find and exploit the latest API vulnerabilities.

Rapid7’s goal is to provide a strategic assessment that helps you mature your security program over time, not just a one-off report.

Best For:

Companies that want to integrate API penetration testing with a broader vulnerability management and security program.

Why You Want to Buy It:

Rapid7’s pen-testing is backed by their extensive threat intelligence and a team that actively contributes to the hacker community.

This ensures they find the latest, most dangerous vulnerabilities, and their reports are comprehensive and geared toward strategic improvement.

Try Rapid7 here → Rapid7 Official Website

Conclusion

In 2025, API penetration testing is a non-negotiable part of a robust security program.

The API Penetration Testing Companies on this list offer a range of solutions to fit different needs, from one-off, expert-led engagements to continuous, automated platforms.

For teams that want an agile, on-demand solution, Cobalt and Synack are excellent choices with their PTaaS and crowdsourced models.

For large enterprises requiring a methodical, enterprise-grade program, NetSPI and Secureworks provide unmatched expertise.

For those seeking continuous security validation, Salt Security and Pentera offer powerful automated platforms that can complement human testing.

Ultimately, the best choice depends on your organization’s specific needs, but all these companies will provide the expertise needed to secure your most critical assets.