Fewer breaking changes
Catch contract violations, missing fields, and incompatible schema changes before a client, partner, or mobile app breaks in production.
Quality Assurance
API Testing
Catch broken contracts, integration failures, and edge cases before they reach production—with functional, security, performance, and contract testing across REST, GraphQL, and microservice APIs.
Validate integrations, contracts and edge cases.
- Contract-tested
- integrations
- OWASP API
- Top 10 coverage
- CI/CD-integrated
- automation
01
Quick answer
What are API testing services?
API testing services validate that an API's functionality, contracts, security, and performance behave correctly—without going through a user interface. Integr8e tests REST, GraphQL, and gRPC APIs for correct behaviour, broken contracts, security weaknesses, and performance under load, then automates the checks that matter into CI/CD.
- Functional, contract & negative testing
- REST, GraphQL, gRPC & microservices
- Security & performance testing for APIs
- CI/CD-integrated automated test suites
Business outcomes
Catch broken contracts and integration failures before release.
Integr8e approaches api testing as a business capability—not an isolated technical task. Priorities stay connected to the users, operations and results behind the work.
Fewer production integration bugs
Validate authentication, error handling, edge cases, and negative scenarios that manual spot-checking of a REST or GraphQL API usually misses.
Faster, safer releases
Run automated API test suites in CI/CD so a broken endpoint or contract change is caught in the pull request, not after deployment.
Confidence across service boundaries
Test how services actually behave together—not just each endpoint in isolation—so integration failures surface before customers see them.
What we deliver
API testing services covering REST, GraphQL, and microservice architectures.
One connected team covers the decisions and delivery work needed to move from uncertainty to a dependable outcome.
Functional API testing
Validate request/response behaviour, status codes, headers, and business logic across REST and GraphQL endpoints, including edge cases and negative paths.
Contract testing
Use consumer-driven contract testing (Pact) and OpenAPI schema validation to catch breaking changes between services before they reach a shared environment.
GraphQL & gRPC testing
Test GraphQL queries, mutations, and resolvers, and validate gRPC services and protobuf definitions beyond what REST-focused tooling covers.
API security testing
Test authentication, authorisation, rate limiting, and input validation against the OWASP API Security Top 10, including broken object-level authorisation.
API performance testing
Measure latency, throughput, and error rate under concurrent load to confirm an API holds up before a client integration or traffic spike arrives.
Microservices & integration testing
Test how services communicate across REST, GraphQL, message queues, and events, including failure handling, retries, and timeout behaviour.
Test automation & CI/CD integration
Build maintainable automated API test suites using Postman/Newman, REST Assured, or Karate, wired into your build and deployment pipeline.
Mock services & test data
Create service virtualisation and realistic test data so teams can test against dependencies that are unstable, rate-limited, or not yet built.
Is this the right fit?
Best suited for engineering teams shipping APIs that other services, partners, or mobile and web clients depend on, especially where a breaking change, integration bug, or undocumented edge case is expensive to discover in production.
Not every challenge needs the same team or solution. We start by testing the business case, current constraints and fastest credible route to value—then recommend a scope that fits the evidence.
How delivery works
A clear path from first question to lasting value.
The plan adapts to your context, while short feedback loops and visible milestones keep the engagement controlled.
- 01
Map
Document the endpoints, contracts, dependencies, authentication, and business rules that matter most, from an OpenAPI spec or the running service itself.
- 02
Design
Define functional, negative, contract, security, and performance test cases against realistic request and response scenarios.
- 03
Automate
Build maintainable automated test suites and wire them into your CI/CD pipeline with clear pass/fail gates.
- 04
Execute
Run functional, contract, security, and performance tests across environments, including realistic concurrent load.
- 05
Report & improve
Deliver a prioritised report on failures and risk, then refine coverage as endpoints, contracts, and dependencies change.
Technology context
Tools chosen around the problem—not the trend.
We select platforms against security, scale, team fit, integration needs and the full cost of ownership.
- Postman
- OpenAPI
- GraphQL
- REST Assured
- Pact
- Node.js
- TypeScript
- GitHub Actions
- Docker
- AWS
Frequently asked questions
Answers about api testing.
Need an answer specific to your environment? Share the context and our team will help you identify a practical next step.
What are API testing services?
API testing services validate that an API's functionality, contracts, security, and performance behave correctly—without going through a user interface. Integr8e tests REST, GraphQL, and gRPC APIs for correct behaviour, broken contracts, security weaknesses, and performance under load, then automates the checks that matter into CI/CD.
What is API contract testing and do we need it?
Contract testing verifies that a service's API still matches what its consumers expect, catching breaking changes before they reach a shared or production environment. It's most valuable for microservice architectures where multiple teams or services depend on the same API and a silent breaking change is expensive to trace.
Do you test GraphQL and gRPC APIs, or only REST?
Yes. Integr8e tests REST, GraphQL, and gRPC APIs. GraphQL testing covers queries, mutations, and resolver behaviour rather than fixed endpoints; gRPC testing validates protobuf-defined services and streaming behaviour that REST-focused tools typically can't reach.
How is API security testing different from a full penetration test?
API security testing focuses specifically on authentication, authorisation, input validation, and the OWASP API Security Top 10 risks like broken object-level authorisation. It can run alongside functional API testing or as part of a broader penetration test covering the wider application and infrastructure.
Can API tests run automatically in our CI/CD pipeline?
Yes. Integr8e builds automated API test suites using tools such as Postman/Newman, REST Assured, or Karate, and wires them into your build or deployment pipeline so a broken endpoint, contract change, or regression fails the build instead of reaching production.
Can you test APIs that depend on services we don't control?
Yes. We can use mocked services, service virtualisation, or contract testing to validate your API's behaviour and integration logic without requiring every real dependency to be available, stable, or free of rate limits during testing.
How long does an API testing engagement take?
A focused engagement covering a defined set of endpoints and contracts typically takes one to three weeks; broader coverage across multiple services, environments, or ongoing CI/CD integration takes longer. Timing is confirmed after reviewing your API surface and priorities.
What does an API testing report include?
Reports include failed test cases, contract violations, security findings, and performance results, each with severity, evidence, and reproduction steps—so engineering teams can prioritise fixes instead of re-diagnosing the issue.
Start with the outcome
Let's make your api testing initiative concrete.
Tell us what needs to change, who it affects and where the current approach falls short. We'll help shape a sensible next step.
hello@integr8e.com