Application programming interfaces, usually just referred to as APIs, are a very common attack vector when enterprises are breached. A poorly written and secured API endpoint can make an organization lose data and customer trust in the blink of an eye. As outlined in the OWASP API Security Top Ten, API attacks can have disastrous consequences for organizations and their customers. The risks present within APIs are why ensuring the security of an organization’s APIs is an important practice. Adhering to API security best practices and standards is a must for any organization exposing APIs internally and externally.
Luckily, there are numerous API security tools out there to help shoulder the burden of creating secure applications and APIs. Apart from the typical things such as cost, simplicity of integration, and ease of use, there are many other factors to consider when adopting new API security tools. Functionality should be at the top of the list and ensuring that the tool fits your exact needs within its features. Selecting the right API security tool involves evaluating capabilities such as API discovery, integration, testing, runtime protection, compliance, scalability, and maintenance to ensure comprehensive protection and alignment with the team's workflow. When selecting an API tool, it should be capable of performing one or more of the following tasks:
API security testing—The API tool must be capable of testing an API using the static application security testing (SAST) methodology, which involves testing the API source code for security flaws, or dynamic application security testing (DAST), simulating attacks to the API to check for security vulnerabilities.
API security posture—The tool should be able to create an inventory of APIs and the methods exposed and classify the data used by each method. This analysis provides visibility into the security state of a collection of APIs.
API runtime security—The tool should provide real-time protection for APIs against potential security breaches and attacks.
Ensuring secure APIs is crucial as it helps organizations proactively detect and manage vulnerabilities in their APIs. In this article, we’ll look at some of the most popular API security tools and how they can help you. Let’s start by looking at some key factors when it comes to API security!
What is API Security?
API security refers to the practices and protocols designed to protect Application Programming Interfaces (APIs) from unauthorized access, data breaches, and other malicious activities. APIs are critical in most modern software applications, enabling communication and data exchange between different systems, services, and devices. As such, they are a prime target for cyber attackers seeking to exploit vulnerabilities and gain access to sensitive data.
Effective API security involves a comprehensive approach that addresses the entire API lifecycle, from design and development to deployment and maintenance. This includes implementing robust authentication and authorization mechanisms, encrypting data both in transit and at rest, and conducting regular security testing. But what kind of threats are we looking at protecting against, and what risks do they bring?
API Security Threats and Risks
APIs are vulnerable to a range of security threats and risks that can have serious consequences for organizations. These include:
Unauthorized Access and Data Breaches: Attackers can exploit weak authentication mechanisms to gain unauthorized access to sensitive data.
Malicious Attacks: Techniques such as SQL injection and cross-site scripting (XSS) can be used to manipulate API endpoints and compromise data integrity.
Business Logic Vulnerabilities: Flaws like insecure direct object references (IDOR) can be exploited to access or manipulate data in unintended ways.
Denial of Service (DoS) and Distributed Denial of Service (DDoS) Attacks: These attacks can overwhelm an API, rendering it unavailable to legitimate users.
Man-in-the-Middle (MitM) Attacks: Intercepting and altering communication between APIs and clients can lead to data tampering and theft.
API Key and Token Theft: Compromised keys and tokens can provide attackers with unauthorized access to APIs.
Data Tampering and Manipulation: Attackers can alter data being transmitted through APIs, leading to data integrity issues.
Understanding these threats is crucial for security teams to implement effective countermeasures and protect sensitive data. Although some of these can be handled manually, there is a large list of great API security tools that can help developers to make APIs more secure. This can be done through either identifying issues within the API code or runtime issues, letting developers know where security gaps are and how to fix them. Let's get started by looking at seven of the most popular tools.
Top 7 API Tools of 2025
StackHawk
StackHawk is a modern API security testing tool founded in 2019. It's a dynamic application security testing (DAST) tool that scans APIs for potential vulnerabilities. StackHawk works by simulating an attack, which is based on common open-source vulnerabilities like OWASP top 10 or custom attack definitions, and observing how the API responds. In other words, it tries to leverage known vulnerabilities on the API to observe how it reacts to them to determine if the API is secure against the vulnerability or not.
Stackhawk provides seamless integration with your CI/CD so that you can automate the testing of every API endpoint in your application. By using StackHawk in your CI/CD pipeline, tests can be run on every commit to ensure developers are aware of any bugs in the codebase as soon as they are introduced.
Advantages of StackHawk
It integrates easily and provides extensive automation capabilities with your CI/CD, automating application testing quickly.
It offers test report analytics and dashboarding.
Helps inventory and prioritize APIs for security testing
StackHawk is built to test modern microservices infrastructure
Full support for all API types: REST, SOAP, GraphQL, and gRPC
Developer-first. Easy to scale application security across teams.
Integrations with popular dev-tools.
Disadvantages of StackHawk
Lacks an on-prem solution required by some industries and organizations.
ZAP
First on our list is ZAP. The Zed Attack Proxy, abbreviated to ZAP, is an open-source web security testing tool. The tool was developed by the Open Web Application Security Project (OWASP) and continuously maintained by the community to ensure it is up-to-date and effective against the latest threats.
ZAP's primary purpose is to provide penetration testing through automation. ZAP works by running simulated attacks against the API endpoint to check for exploitable vulnerabilities. By using this technique, ZAP lets developers know how their API will respond to an attack in real time. The result of these tests allows developers to implement security steps or refactor code to mitigate the discovered security defect.
ZAP is a cross-platform tool and can run on a variety of operating systems, including Mac OS, Windows, and Linux. The platform's primary language support is Java, but it also supports a variety of other languages such as JavaScript, JRuby, and other JSR 223 languages.
Advantages of ZAP
Free and open-source
Tests web applications and APIs against vulnerabilities outlined in the OWASP Top 10
Supports integration with various other platforms
Capable of generating test case reports
Disadvantages of ZAP
Could use more detailed test reporting functionality
Lacks automation support
Wallarm
Wallarm is an all-in-one API security tool that provides API security posture reports, security testing, and runtime protection.
Founded in 2014, it protects an API against runtime attacks, provides dynamic application security testing, and provides continuous API service discovery to give you an overview of your API inventory.
Wallarm integrates with any CI/CD workflow, allowing you to run dynamic test cases automatically.
You don't need a lot of programming experience to utilize Wallarm. It's a no-code tool hosted as a managed SaaS platform so Operating System compatibility is not a concern.
Advantages of Wallarm
It provides seamless integration with other platforms.
It's a full-suite API security tool.
It provides analytics and dashboarding of test reports.
Disadvantages of Wallarm
Very costly to run since pricing runs quite high.
42 Crunch
42 Crunch is a robust API security platform developed in 2016 to provide API security posture, automate API security testing in your CI/CD pipeline, and enforce security policies. 42 Crunch provides protection to APIs against threats in runtime through their firewall. The platform also provides auditing and discovery into your API inventory. From the API security testing standpoint, it provides static analysis testing for your APIs.
42 Crunch is a no-code SaaS platform, which means it's not dependent on any programming language and doesn't have any issues with OS compatibility.
42 Crunch also offers seamless interaction with many platforms, allowing you to automate security testing in your CI/CD workflow.
Advantages of 42 Crunch
It's a full-suite API security tool.
It provides integrations with your CI/CD workflow.
It provides analytics and dashboarding of test reports.
Disadvantages of 42 Crunch
Expensive since you are paying for a full suite of features, whether you use them or not.
It allows for fewer integrations with other platforms.
SALT Security
SALT is an API security platform founded in 2016 that provides continuous discovery and security posture management of all your APIs, including shadow and zombie APIs. This allows you to have the full context of your APIs and be aware of the data you're exposing. The platform allows you to scan and test your APIs for security vulnerabilities and protect APIs against runtime attacks.
SALT is a cross-platform software, meaning it can run on different types of operating systems and integrates seamlessly with your CI/CD workflow.
Advantages of SALT Security
It's a full-suite API security platform.
Provides integration with your CI/CD.
It provides analytics and dashboarding of test reports.
Disadvantages of SALT Security
Pricing is not transparent and not available on their website
No self-serve demo available
Postman
Postman is an API tool for creating and managing APIs. Within it’s suite of tools, Postman provides a testing solution that allows you to test your API for vulnerabilities. You can, for example, test your API to see if it has a broken authentication level or not.
It also has features that allow you to automate your security tests. With the potential to run your security tests within your CI/CD workflows.
Postman supports a variety of common languages and runs on Windows, MacOS, and Linux.
Advantages of Postman
great offering in the free tier, and paid tiers are still cost-effective.
It's cross-platform.
It provides analytics and reporting of tests.
It provides integration with different platforms.
Disadvantages of Postman
Integration possibilities are currently limited.
Imperva
Imperva is a cybersecurity software company founded in 2002 that offers an API security solution that includes API posture security and API runtime protection.
Imperva enables continuous deep discovery into your API inventory to eliminate data leakage and abuse. The platform allows users to be aware of what sensitive data they're exposing through their API endpoints, shadow APIs, and so on.
The company also uses a machine learning model to protect APIs in real-time against vulnerabilities in the OWASP top 10 and other new threats such as bad bot attacks, DDoS, credential stuffing, and so on.
Advantages of Imperva
It provides easy integration into your CI/CD.
Provides real-time API protection through machine learning models.
Disadvantages of Imperva
Has limited integration with other platforms.
API Security Best Practices
Regardless of the tools used, there are always some best practices you should adhere to when scaling up API security. To ensure the security of APIs, organizations should follow best practices that cover various aspects of API security, many of which the tools above can help with or help to detect issues with. These include:
Implement Authentication and Authorization: Almost all APIs should have some type of authentication and authorization in place for users. Use strong authentication mechanisms and ensure that only authorized users can access API endpoints.
Encrypt Data: Attackers can't exploit data they can't access. Protect data in transit and at rest using encryption to prevent unauthorized access and data breaches.
Conduct Regular Security Testing: There's no better way to be prepared than to continuously test your API's security. Perform dynamic application security testing (DAST) and other security tests to identify and mitigate vulnerabilities.
Rate Limiting and Throttling: Implement rate limiting to prevent abuse and ensure APIs are not overwhelmed by excessive requests.
Use Secure Protocols: Ensure APIs use secure communication protocols like HTTPS and TLS to protect data integrity and confidentiality.
Validate User Input: As one of the first steps in keeping your APIs safe, implement input validation and data sanitization to prevent injection attacks and other malicious activities.
Deploy a Web Application Firewall (WAF) and API Gateway: Use WAFs and API gateways to provide an additional layer of security and manage API traffic. This can help streamline many of the best practices listed above, including rate limiting and encryption.
Monitor API Traffic and Logs: Continuously monitor API traffic and logs for suspicious activity to detect and respond to potential threats. If something makes it through your defenses, set up alerts so you can remediate it ASAP.
Incident Response Plan: When something does go wrong, know what to do! Have an incident response plan in place to quickly address and mitigate the impact of security breaches.
By knowing and putting these best practices into action, organizations can significantly enhance their API security posture and protect their APIs from a wide range of security vulnerabilities. Whether preventing API security issues or detecting them after they have already occurred, a holistic strategy that covers as many angles as possible is the best defense (and offense) when it comes to protecting your APIs.
Final Thoughts
In this post, we looked at some of the top API security tools for your organization. Generally, a single tool will not cover every aspect of security so the best strategy is to layer tools for complete coverage. Although many platforms exist, each has its own advantages and disadvantages which may or may not be applicable to your use case. One thing to keep in mind when selecting an API security tool is to be certain about what you want out of the tool. For instance, if all you need is an API testing tool, there's likely no need to invest in a full API security suite. Other factors to consider are affordability, language and OS support, ease of use, and available integrations.
Whether you're just beginning to think about API security tools or are upgrading your existing suite, StackHawk offers an easy and affordable solution to implement dynamic application security testing. Plug StackHawk directly into your CI/CD pipeline or run it locally and identify potential vulnerabilities in minutes. Easily access reports and discover potential fixes from within the platform and level up your API security with ease and automation. To get started, sign up for your free trial today!
Additional resources
Read on to see how StackHawk's CSO, Scott Gerlach talks about “Shift Left” being more than just a buzzword here.
Check out why Omdia's On the Radar report highlights StackHawk as an “interesting alternative to most other DAST tools” here.
Getting started with StackHawk? Check out Advice and Answers from the amazing StackHawk team here.
