Comprehensive API coverage that keeps up with your shipping pace.
Checksum's API agent deeply analyzes your entire API, generates tests across every endpoint and parameter combination, and keeps coverage current as your APIs evolve.
Real APIs are too complex for manual testing.
AI-accelerated teams ship API changes constantly. Real APIs have hundreds of endpoints and millions of parameter combinations. Manual testing does not scale, and ad hoc generation with AI coding assistants is not continuous or systematic. Coverage looks fine on paper until something breaks in production and you realize a whole class of inputs was never tested.
The risk is not just individual bugs. It is the slow accumulation of untested surface area that nobody has a clear view of. As the API grows, the gap between what is covered and what is actually being called in production widens. By the time a coverage gap surfaces as an incident, the cost of the fix is far higher than the cost of catching it earlier, and tracing it back to the root cause takes time your team does not have.
How API testing works
Maps every fingerprint not just endpoints
Checksum reads your API documentation—OpenAPI specs, Swagger docs, or live traffic captured via SDK—and builds a complete picture of every endpoint, query parameter, header, and payload structure. These combinations are what we call fingerprints. Every fingerprint gets tested.
Tests flows, not just status codes
Most tools check whether an endpoint returns 200. Checksum tests whether your system actually works, chaining requests across multiple endpoints to verify that real user flows behave correctly end to end.
Covers all APIs
not just public
Customer-facing APIs, the APIs your UI calls, internal service-to-service APIs: Checksum covers all of them. If it's part of how your system communicates, it's part of what gets tested.
Stays current,
not static
As endpoints are added, modified, or deprecated, Checksum updates coverage automatically. No manual maintenance, no stale test suites. The agent keeps pace with your shipping velocity.
Runs and reports, not just generates
Most AI testing tools stop at generation. Checksum actually executes the tests, runs them on its cloud infrastructure, and delivers results you can act on. You see what passed, what failed, and exactly which endpoint or flow broke.
API coverage that actually scales
Thousands of endpoints covered in days, not months. Checksum maps and tests your entire API surface automatically.
Tests stay current automatically
As endpoints are added, modified, or deprecated, Checksum updates coverage without anyone maintaining it by hand. Across the platform, teams see 82% lower failure rates compared to manual maintenance.
From zero to full coverage in days
Postman collections take months to build and maintain. Checksum maps your entire API surface and generates tests across every endpoint automatically. Most teams reach meaningful coverage within a week of setup.
Frequently Asked Questions
Postman requires someone to write and maintain collections manually. Checksum generates and maintains tests automatically, runs them continuously, and scales across thousands of endpoints without any manual upkeep.
It means Checksum maps every unique combination of query parameters, headers, and payload structures across your API. Instead of testing a handful of example requests, it ensures every variation is covered.
Both. Checksum covers external customer-facing APIs, internal service-to-service APIs, and anything in between.
Checksum handles auth flows as part of test setup, including token generation, session management, and multi-step authentication chains.
That's exactly what it's built for. As your API evolves, Checksum detects the changes and updates tests to match. Coverage stays current without anyone having to maintain it manually.
Yes. Tests are delivered as real code your team owns. Run them anywhere, modify them however you want, no vendor lock-in.
Stop letting API change outpace your test coverage.
Get comprehensive API testing that scales with your team.
