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Test before the UI exists
Backend behaviour can be verified as soon as the endpoint is deployable, removing the bottleneck of waiting for a finished interface.
API Testing Services
Every endpoint verified for correctness, contract stability, performance and security — before the interface that depends on it is even built.
REQUEST / RESPONSE TRACEACTIVE
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Direct answer / 01
What is API testing?
API testing is the practice of validating an application's endpoints directly, rather than through its user interface. It checks that each request returns the correct data and status code, that error handling behaves as specified, that the contract between services stays stable, and that authentication and authorisation cannot be bypassed. Because API tests run without a browser they are dramatically faster and more stable than UI tests, which makes them the most cost-effective layer of an automated testing strategy.
Coverage
What our API testing covers
Functional testing of every endpoint: status codes, payloads, headers and error paths
Contract testing so a provider change never silently breaks a consumer
Integration testing across microservices and third-party APIs
Authentication, authorisation and access-control verification on protected routes
Input validation, injection and OWASP API Security Top 10 checks
Performance baselines for latency and throughput under realistic load
01 — Observe
02 — Automate
03 — Integrate
Tooling
Built in tools your team already uses
We automate API suites in Postman/Newman, REST Assured, Playwright's request API, Pact for consumer-driven contracts, and k6 for endpoint performance — then run them on every commit.
Because API tests are fast, they give developers feedback in seconds rather than minutes, which is what makes teams actually keep them green.
Value
Why API testing pays for itself
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Fast, stable feedback
An API suite runs in seconds and doesn't break when a button moves, so it stays trustworthy far longer than UI automation.
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Security at the right layer
Most real-world breaches exploit the API, not the interface. Testing authorisation at the endpoint catches what UI testing never will.
Continue exploring
Related testing services
EXPLORE / 01
End-to-End Testing
Full user journeys verified across every integrated system.
EXPLORE / 02Mobile Testing
Real-device coverage for iOS and Android releases.
EXPLORE / 03Accessibility Testing
WCAG 2.2 and ADA conformance, audited and automated.
EXPLORE / 04Exploratory Testing
Manual, human-led testing that finds what scripts miss.
EXPLORE / 05QA Outsourcing
QA professionals at every level, embedded in your team.
EXPLORE / 06Process Improvement
QA strategy, CI/CD integration, and team enablement.
Useful answers
Questions,
clarified.
API testing validates an application's endpoints directly — checking responses, status codes, error handling, contracts, authorisation and performance — instead of testing through the user interface.
Functional, contract, integration, regression, performance and security testing for REST, GraphQL and gRPC services, all automated and run in your pipeline.
Postman and Newman, REST Assured, Playwright's request API, Pact for contract testing, and k6 or JMeter for endpoint performance work.
API testing exercises the service layer directly, so it is faster, more stable and cheaper to maintain. UI testing verifies what the user actually sees. A healthy strategy uses many API tests and a small number of critical UI journeys.
Yes. We test against sandbox environments where providers offer them, and use contract tests plus recorded responses where they don't, so a provider outage doesn't take your pipeline down with it.
Our API suites include authentication, authorisation, input validation and OWASP API Security Top 10 checks. Deeper penetration testing is scoped separately.
Next signal
Turn uncertainty into a clear plan.
Tell us what you are building and where quality or design is slowing you down.
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