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API Automation Specialist (CST-API™)

API Automation Specialist (CST-API™)

The CST-API™ (API Automation Specialist) is a certification that confirms the candidates' abilities to automate both functional and non-functional API testing. The main aim is for the QA engineers, automation specialists, and developers who are the ones to be held responsible for the API reliability and performance to obtain it. The credentials examine real-world knowledge of RESTful services, SOAP, and other emerging standards such as GraphQL. The candidates provide the proof of their strong technical skills through the successful implementation of request-response validation, schema verification, and data-driven automation.

The test is concentrated on creating sustainable automation frameworks, their compatibility with CI/CD pipelines, and the use of all the features, like authentication, authorization, error handling, and mock services, that are at an advanced level. The CST-API™ is a certification that provides professionals with the competency to implement the automation that will lead to the release of new versions being faster while at the same time keeping the security and reliability of the delivery of services to the distributed systems.



Price $ 149
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Objective of the Certification

  • Build a strong foundation in API fundamentals and the HTTP protocol — understanding request methods, status codes, headers, and how RESTful/SOAP APIs communicate.
  • Develop proficiency in request construction and response validation — sending requests and validating responses, including status codes, headers, and body content using assertions.
  • Establish competency in API test framework design — building maintainable and scalable automation frameworks using tools such as REST Assured, Postman/Newman, or similar technologies.
  • Build skills in authentication and authorization testing — validating APIs secured with API keys, Basic Authentication, OAuth 2.0, JWT, and other authentication schemes.
  • Develop competency in test data management and data-driven API testing — supplying and validating requests using external data sources and parameterization techniques.
  • Introduce CI/CD integration practices — integrating automated API test suites into continuous integration pipelines such as Jenkins, GitHub Actions, and Azure DevOps.
  • Build competency in reporting, logging, and debugging — generating actionable test reports and diagnosing API test failures efficiently.
  • Establish best practices for framework maintainability and scalability — writing reusable and robust code that scales with growing API surface area and test coverage.
  • Prepare candidates to contribute effectively to automation teams — equipping them with practical skills to build, extend, and maintain real-world API test suites.
  • Create a foundation for progression toward advanced automation and SDET roles — such as automation architecture, performance/load testing, or automation leadership positions.

Exam Information

Exam Name API Automation Specialist
Exam Code CST-API™
Exam Format Multiple Choice Questions (MCQ) & Code-Based/Practical Scenario Questions
Duration 120 minutes
Number of Questions 75
Passing Score 70%
Mode of Exam Test Center Based Testing / Online Testing
Language English
Validity Lifetime
Open Book No

Domains & Weightage

Domain Weightage
API Fundamentals & HTTP Protocol 15%
Request Construction & Response Validation 15%
API Test Framework Design 20%
Authentication & Authorization Testing 15%
Test Data Management & Data-Driven Testing 10%
CI/CD Integration & DevOps Practices 10%
Reporting, Logging & Debugging 8%
Best Practices, Maintenance & Scalability 7%
Total 100%

Who Should Take CST-API™ Certification?

  • Manual QA testers transitioning into API test automation roles.
  • SDETs (Software Development Engineers in Test) building or maintaining API automation frameworks.
  • QA Automation Engineers responsible for API and backend test suites.
  • Backend developers contributing to test automation as part of a DevOps or Agile team.
  • Automation leads and architects evaluating or standardizing team API testing practices.
  • Individuals who have completed CSTF™ or hold equivalent foundational software testing knowledge and want to specialize in API automation.

How CST-API™ Certification Helps In Career Growth?


  • API automation expertise — CST-API™ validates practical knowledge of API testing and automation, helping professionals build specialized skills beyond traditional UI testing.
  • Backend and service-layer specialization — develops the ability to validate business logic, API responses, data contracts, and integrations directly at the service layer.
  • Framework and tooling credibility — demonstrates familiarity with industry-standard API automation tools such as REST Assured and Postman/Newman for building and maintaining automated test suites.
  • Security-aware testing skills — builds knowledge of authentication and authorization testing, including API keys, OAuth 2.0, JWT, and role-based access scenarios.
  • DevOps and CI/CD relevance — develops skills for integrating API automation into CI/CD pipelines using platforms such as Jenkins, GitHub Actions, and Azure DevOps.
  • Foundation for advanced specialization — provides a foundation for progressing into microservices testing, contract testing, performance and load testing, automation architecture, and advanced SDET roles.

Career Opportunities After Earning The CST-API™ Certificate

  • API Test Automation Engineer
  • SDET (Software Development Engineer in Test)
  • Backend QA Engineer
  • API / Integration Test Specialist
  • DevOps QA Engineer
  • Automation Framework Architect
  • Test Automation Lead
  • Performance Test Engineer with further experience and specialization
  • Automation Manager with further experience and leadership development

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FAQs

Ans. The protocols that are covered in CST-API™ are REST, SOAP, and GraphQL. Candidates perform several operations as request handling, response validation, and schema verification, on these services.

Ans. Definitely. The security testing comprises OAuth 2.0, JWT, Basic Auth, and API key management. Candidates work on the service security validation part.

Ans. Some of the common tools that are used to prepare for this exam are RestAssured, Postman, Newman, and JUnit/TestNG. The exam is mainly about the framework design and its maintainability.

Ans. Yes. The candidates are required to demonstrate the API automation that is integrated into the pipeline with the help of Jenkins, GitHub Actions, or any other CI/CD tools.

Ans. Yes. The test covers knowledge of rate limiting, error resilience, and performance monitoring with the help of suitable tools and techniques.

Ans. The most career growth component is the professionals from the field of Automation Engineering, Developers, and DevOps who work on the API and want to showcase their advanced skills in API Testing.