API Testing

API & Integration Testing

Your UI might look perfect, but if the API behind it returns the wrong data, drops a payment, or leaks a session token. none of that matters. We test every endpoint, every contract, and every auth flow so your backend works exactly as it should.

Every REST, GraphQL, and gRPC endpoint covered and validated

Contract testing between your microservices. no more breaking deploys

Auth flows tested end-to-end. OAuth2, JWT, API keys, RBAC

Error handling, rate limits, and edge cases. not just happy paths

Fully automated suite running on every PR and deployment

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100%

Endpoint coverage

48h

Strategy delivery

24+

Projects delivered

Years experience

Why This Service

The layer where real bugs hide. and most teams skip it

Your payment flow looks perfect in the browser. But what happens when the API returns a 200 with an empty body? Or when an expired token still grants admin access? Or when a third-party webhook silently fails? These are the bugs that make it to production. because nobody tested the API layer properly.

We go through every endpoint in your system. REST, GraphQL, gRPC. and validate the contracts, auth flows, error handling, and data transformations that your UI tests can't see. If a microservice returns the wrong data or breaks a contract, we catch it before your users do.

Everything is automated and runs on every pull request. No one manually clicks through Postman collections. No one says "we'll add API tests later." From day one, your backend is covered.

70%Less manual work

48hStrategy delivery

99%Avg pass rate

What's Included

Everything Included from Day One

A complete, end-to-end QA service. every deliverable, every tool, every report included.

Endpoint Testing

All HTTP methods. GET, POST, PUT, PATCH, DELETE
Request/response schema validation against spec
Status code and error message verification
Pagination, filtering, and sorting validation
Rate limiting and throttling behaviour tests

Auth & Security Testing

OAuth2, JWT, API key, and Basic Auth flows
Token expiry and refresh cycle validation
Role-based access control (RBAC) testing
SQL injection and XSS via API payloads
Sensitive data exposure checks in responses

Contract Testing

Consumer-driven contract tests with Pact
Service-to-service integration validation
Breaking change detection before deployment
Schema versioning and backward compatibility
Third-party API mock setup and validation

Integration & Workflow Testing

End-to-end business workflows via API calls
Database state assertions after every action
Event-driven testing. Kafka, RabbitMQ, SQS
Webhook delivery, retry, and payload testing
Microservice dependency mapping and validation

Reporting & Monitoring

API coverage matrix. every endpoint tracked
Response time trend analysis per endpoint
Error rate dashboards with alert thresholds
Automated regression reports on every deploy

Automation & CI/CD

Full suite in Postman/Newman or Python requests
CI/CD wiring. tests run on every PR automatically
Mock servers for isolated, fast test runs
Contract test automation with Pact framework

Our Approach

How We Actually Work

No black box. Here's exactly what happens from the first call to a fully running test suite. and what you get at each stage.

We map every endpoint you have

First, we inventory your entire API surface. endpoints, auth mechanisms, integrations, data contracts. If you have Swagger or OpenAPI specs, we use those as the baseline. If not, we create the documentation as we go.

We design tests that go beyond happy paths

For every endpoint, we build test cases covering success scenarios, error conditions, boundary values, security checks, and edge cases. Each test is mapped to a requirement for full traceability.

We mock your dependencies so tests run fast

Third-party APIs like Stripe or Twilio shouldn't slow your tests or charge you money. We set up mock servers so your suite runs fast, reliably, and independently of external services.

We automate everything into your pipeline

We build the full suite in Postman/Newman, Python, or REST Assured. whichever fits your stack. and wire it into your CI/CD pipeline. Tests run on every PR, every push, every deploy.

We add contract tests between your services

If you run microservices, we implement consumer-driven contract tests using Pact. This means each team can deploy independently without worrying about breaking another service's integration.

We monitor and catch regressions automatically

After setup, we configure API monitoring with alert thresholds. Any regression in response time, error rate, or schema compliance triggers an immediate notification to your team.

Technology Stack

Tools and Frameworks We Use

Tool-agnostic by design. we select the best technology for your specific stack and workflow.

Postman

API design, testing, and team collaboration

Newman

Postman collection runner for CI/CD pipelines

Python Requests

Flexible HTTP client for complex test scenarios

REST Assured

Java-based API testing with fluent assertions

GraphQL

Query, mutation, and subscription testing

Pact

Consumer-driven contract testing for microservices

WireMock

API mocking for fast, isolated test environments

Swagger / OpenAPI

Spec validation and auto-generated test cases

GitHub Actions

API tests on every PR, push, and deployment

Jenkins

Enterprise CI/CD for scheduled API regression

Jira

Defect tracking with API error context

TestRail

Test case management and coverage reporting

Test Coverage

Every Layer, Every Flow

Comprehensive coverage across UI, API, data, and security layers. nothing gets missed.

REST APIs

All endpoints, methods, and status codes

GraphQL APIs

Queries, mutations, and subscriptions

gRPC Services

Protocol buffer and streaming validation

Auth Flows

OAuth2, JWT, API keys, and RBAC

Microservice Contracts

Consumer-driven Pact contract tests

Webhooks

Delivery, retry, and payload validation

Event-Driven Systems

Kafka, RabbitMQ, SNS/SQS testing

Third-Party APIs

Stripe, Twilio, Salesforce, AWS services

Database Integration

State assertions after every API call

Why It Matters

Real Impact from Sprint One

Measurable outcomes your engineering team and business will feel immediately.

Catch Bugs Early

API bugs caught at the integration layer cost 10x less to fix than in production.

Faster Development

Automated API tests give developers instant feedback on every code change.

Security Confidence

Every endpoint validated for auth vulnerabilities before it reaches production.

Contract Assurance

Service contracts tested automatically. no more breaking changes between microservices.

Full Coverage Reports

Detailed coverage reports showing every endpoint status after every deployment.

CI/CD Integration

API test suite runs on every pull request. zero manual trigger required.

FAQ

Got questions?

Here are the ones we get asked most. If yours isn't here, just ask. we're happy to talk it through.

Want to talk through your specific setup?

We'll walk you through how this works for your stack, team size, and release cadence. zero commitment.

Book a Free Consultancy Call

Free 30-min call

Strategy in 48h

No commitment

01What types of APIs do you actually test?

REST, GraphQL, gRPC, SOAP, and WebSocket APIs. We also cover event-driven architectures using Kafka and RabbitMQ, webhook delivery testing, and third-party API integrations.

02We already have Postman collections. do you start from scratch?

03How do you deal with third-party APIs like Stripe or Twilio?

04What is contract testing and does our team need it?

05How long does it take to build a full API test suite?

Ready to get started?

Get a tailored QA strategy in 48 hours. we review your stack, identify gaps, and propose a clear testing roadmap.