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API testing services check the part of your software users never see but always depend on: the API. Hyper Software tests REST and GraphQL APIs for correct data, errors, security and speed, then automates those tests so every release is checked before it reaches your app, website or partners.
When an app shows a blank screen or a payment status never updates, the API is often where the bug lives.
API testing sends requests to an application's endpoints and checks the responses against what's expected. A simple example for GET /orders/123:
Multiply that by every endpoint and every user role, and you see why API bugs slip through without structured testing.
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| Test | What it catches |
|---|---|
| Functional | Wrong data, missing fields, bad calculations |
| Validation / negative | Crashes on bad input, unclear error messages |
| Contract | Response no longer matches what apps expect |
| Security | Broken auth, data exposure, missing rate limits |
| Load and performance | Slow endpoints under traffic |
| Integration | Failures between your API and third parties |
| Regression | Old endpoints broken by new changes |
| Tool | Best use |
|---|---|
| Postman + Newman | Quick functional suites, easy sharing, CI runs |
| REST Assured | Java teams wanting code-based tests |
| Playwright / Supertest | JavaScript teams testing APIs alongside UI |
| k6 / JMeter | API load and performance |
| Swagger / OpenAPI | Contract source of truth |
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Not sure where to start? Call or WhatsApp Hyper Software on +91 9079282750 or email info@hypersoftware.in for a free first consultation about API Testing.
| Scope | Indicative cost |
|---|---|
| Up to 20 endpoints, functional + negative tests | ₹30,000 to ₹70,000 (about US$350 to US$850) |
| 20 to 80 endpoints with automation in CI | ₹70,000 to ₹2,00,000 (about US$850 to US$2,400) |
| Ongoing API QA | Monthly, based on release frequency |
Developers often write unit tests for their own code, which is good. What usually gets skipped: role-based access checks, negative tests, and end-to-end tests across services. That's where data leaks and silent failures come from.
| Developer-only testing | Dedicated API testing | |
|---|---|---|
| Happy path | Covered | Covered |
| Negative and edge cases | Partly | Fully |
| Access control per role | Often missed | Tested |
| CI regression suite | Sometimes | Always |
API testing checks an application's endpoints by sending requests and verifying the responses. It covers data, errors, security and speed.
Testing up to 20 endpoints usually costs ₹30,000 to ₹70,000. Larger APIs with automation cost more.
Yes. We test GraphQL queries, mutations, permissions and performance.
We can document it from the code or traffic and create an OpenAPI file as part of the project.
Yes. We run tests with Newman or code-based tools in GitHub Actions, GitLab CI, Jenkins and others.
Yes. We test authentication, authorization per role, data exposure and rate limits.
Yes. We use k6 or JMeter to test response times and limits under traffic.
Yes. We test how your system handles payment, SMS, shipping and other external APIs, including failures and timeouts.
Yes. You own the Postman collection or test code we build.
A small API takes about a week. Larger APIs take 2 to 4 weeks for full coverage.
A healthcare booking platform had a mobile app and a partner portal on the same API. Every release broke something for partners. We documented 54 endpoints, wrote 300+ Postman tests including role checks, and connected them to their GitHub pipeline. In the first run we found that a partner token could fetch bookings belonging to other clinics. After fixing that and adding contract tests, partner-reported bugs dropped sharply over the next two months.
Sending a request like GET /orders/123 and checking the status code, data and speed of the response.
Postman is easiest to start. REST Assured and Playwright suit code-based teams.
API testing checks the backend directly. UI testing checks the screens users see.
Yes, and it's one of the most reliable areas to automate.
Checking that an API's responses match what its consumers expect.
Have questions or need expert guidance? Our team is ready to help you with the right technology solutions for your business.