API testing
Beneath every app there's a layer of APIs no one sees until it fails. We test contracts, integrations, data and response codes so that invisible layer holds: correct requests, reliable responses and controlled errors.
What is API testing?
API testing checks the layer that connects your application to its services, its database and other systems: the part the user doesn't see but everything depends on. We verify that each endpoint responds what it should, with the right data and the correct status code, against valid and invalid inputs.
We test contracts (request/response), authentication, permissions, data validation, error handling, limits and performance. We automate the tests so they run on every change and instantly detect if an integration breaks, before the interface notices.
The API is the plumbing: when it breaks, the whole house floods
A modern app is a puzzle of services talking over API. If an endpoint changes a field, returns a 500 or takes too long, the interface breaks even though the fault isn't in the interface. Testing the API layer (contracts, data and errors) is the cheapest way to find problems: close to the source, before they spread across the whole app.
What you gain by testing the invisible layer
Without API testing
What you gain with the layer tested
We validate request and response of every endpoint so a change doesn't take down whoever consumes it.
We check status codes, messages and edge cases so failures are handled, not exploded.
We verify that information travels correct and complete between services, with no corruption or gaps.
We test the API on every change and find the problem where it starts, not three layers up.
Our process, step by step
Endpoint and contract analysis
runningWe review your documentation and your API to map endpoints, contracts, authentication and critical flows.
Test case design
queuedWe define tests for valid and invalid inputs, permissions, errors, limits and edge cases.
Collection automation
queuedWe code the tests (Postman, REST-assured or similar) with data and assertions on status, schema and timing.
Execution and CI/CD integration
queuedWe connect the suite to your pipeline so it validates contracts and responses on every change.
Contract report and recommendations
queuedWe deliver which endpoints fail, which contracts break and the actions to make the API solid.
We test the layer that holds up your product
We're an ISTQB®-certified team that tests REST and GraphQL APIs daily: contracts, security, data and performance. We automate the tests, integrate them into your CI and explain every failure in your language, with the exact endpoint and payload.
What the service includes
Request a quote for testing your API
Tell us what API you have and how it's consumed. We reply in under 24h, in Spanish or English, with a tailored proposal.