API Testing That Validates the Whole Workflow
Stratos™ by Clear Sky tests your REST and SOAP APIs for correctness, performance, and resilience — and chains them into the complete business workflows they power. Validate business logic, not just status codes, and prove your APIs hold under production-scale load.
API Testing
How does Stratos™ test APIs?
Stratos™ tests APIs end to end — validating REST and SOAP services for functional correctness, performance, and resilience, and chaining API calls into the complete business workflows they power rather than checking each endpoint in isolation.
It validates response schemas, status codes, payloads, and business logic; runs functional and load testing on the same APIs — simulating up to 25,000 concurrent virtual users across 43+ regions; and connects over standard and custom protocols, including HTTP/HTTPS, SOAP, and raw sockets, to drive tests against the services behind your applications.
Why Stratos™ Is Built for API Testing
Beyond Status Codes
A 200 response doesn't mean the workflow worked. Stratos™ validates payloads, schemas, and business logic — not just whether an endpoint replied.
APIs in Real Workflows
Chain API calls into the complete business processes they power — across services, batch jobs, and UIs — instead of testing each endpoint in isolation.
Functional + Load Together
Run functional and performance testing on the same APIs — simulating up to 25,000 concurrent virtual users across 43+ regions — to prove they hold under real load.
REST, SOAP & Custom Protocols
Test REST and SOAP services, and connect over standard and custom protocols — including HTTP/HTTPS and raw sockets — to reach the services behind your applications.
Contract & Schema Validation
Validate response schemas, status codes, and contracts so changes that would break consumers are caught before release.
AI-Generated Scenarios
Generate positive paths, negative tests, and edge cases from your API specs, then review and approve every scenario before it runs.
What Stratos™ Can Do for Your APIs
Functional API Testing Across REST and SOAP
Validate request and response behavior, status codes, payloads, and business logic across REST and SOAP services in one platform.
API Load and Performance Testing at Scale
Stress your APIs with up to 25,000 concurrent virtual users from 43+ regions to find breaking points and latency issues before production.
End-to-End API Workflow Chaining
Chain dependent API calls — passing data, tokens, and state between steps — to test complete multi-service workflows, not isolated endpoints.
Schema, Contract, and Response Validation
Assert against response schemas and contracts so breaking changes are caught at the API layer before they reach consumers.
Custom Protocol and Raw Socket Testing
Reach services that mainstream tools can't — connecting over raw sockets and custom protocols to drive tests against the systems behind them.
CI/CD-Integrated API Regression
Run API regression suites automatically on every build through Jenkins, GitLab CI, Azure DevOps, and more.
Common API Testing Use Cases
Microservices Integration Validation
Test how services interact under real concurrency — validating data flow, business logic, and response latency across every service boundary, not just one endpoint at a time.
Third-Party & Partner API Verification
Verify that integrations with external and partner APIs behave correctly — including error handling, retries, and contract changes — before they affect customers.
API Performance Under Peak Load
Simulate peak traffic against your APIs to expose latency, throughput, and stability limits — and prove capacity before a launch or seasonal spike.
Backend-for-Frontend Validation
Validate the API layer that powers your web and mobile front ends, ensuring the contracts your UIs depend on stay correct release over release.
Release Regression Suites
Build API regression suites that run automatically on every release, catching breaking changes before they reach staging or production.
Stratos™ Tests APIs Across Your Stack
Explore More
Prove Your APIs Hold Up
See how Stratos™ tests your APIs for correctness, performance, and resilience — from a single endpoint to a complete end-to-end workflow.
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