API Testing
Variants seen in the corpus:
API Testingapi testingapi-testing
Providers using this tag (61)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 1 Complete, well-documented, and agent-ready
Strong 1 Solid coverage with minor gaps
Developing 10 Usable, with meaningful gaps to close
Thin 24 Limited public surface area
Emerging 21 Early or largely undocumented
Minimal 4 Almost no public developer surface
APIs with this tag (39)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Strong 1 Solid coverage with minor gaps
Developing 5 Usable, with meaningful gaps to close
Testkit (YAML API Testing DSL)MIT-licensed Rust testing tool by the APItoolkit/Monoscope team that uses a simplified YAML DSL for definin...PactFlowPactFlow is SmartBear's contract testing platform that ensures API changes do not break consumer applicatio...ReadyAPIReadyAPI is SmartBear's API quality platform for functional, security, and performance testing. It supports...Fiddler EverywhereFiddler Everywhere is a cross-platform web debugging proxy for macOS, Windows, and Linux. It captures HTTP ...HoppscotchHoppscotch is a lightweight open-source browser-based API client supporting REST, GraphQL, WebSockets, SSE,...
Thin 15 Limited public surface area
BrunoBruno is an open-source API client and test suite manager that stores API collections as plain files alongs...HurlHurl is a command-line tool that runs HTTP requests defined in a simple plain-text format, enabling lightwe...Postman APIAPI for managing Postman collections, environments, monitors, mock servers, and test runs programmatically....Traceable API Security PlatformTraceable provides an intelligent API security platform offering API discovery, threat detection and protec...Karate API Testing FrameworkKarate is an open-source framework that combines API test automation, mocks, performance testing, and UI au...Speedscale PlatformSpeedscale captures production API traffic and replays it in lower environments for load testing, regressio...Bruno API ClientBruno is an open-source API client for exploring and testing REST, GraphQL, and gRPC APIs. Collections are ...Assertible APIThe Assertible API enables programmatic management of API tests, test suites, and monitoring configurations...SchemathesisSchemathesis is a property-based API testing tool that automatically generates test cases from OpenAPI and ...Dredd APICommand-line HTTP API testing framework that validates API implementations against API Blueprint or OpenAPI...REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...REST ClientREST Client is a Visual Studio Code extension for sending HTTP requests and viewing responses directly with...Thunder ClientThunder Client is the flagship VS Code REST API client extension offering a lightweight GUI for sending HTT...Thunder Client CLIThe Thunder Client CLI (@thunderclient/cli) is a Node.js command-line tool for running Thunder Client reque...SuperTestSuperTest is a Node.js library for testing HTTP servers by providing a high-level abstraction for HTTP asse...
Emerging 17 Early or largely undocumented
Bruno API ClientThe core open-source, git-native desktop API client (a lightweight Postman/Insomnia alternative). Compose a...Bruno CLI (bru)The @usebruno/cli command-line runner (invoked as bru, installed via npm install -g @usebruno/cli) executes...KarateKarate is a modern open-source BDD framework that unifies API testing, UI automation, performance testing, ...RestfoxRestfox is a lightweight, offline-first web HTTP client for testing REST APIs, similar to Postman but brows...Testim API TestingAuthoring and execution surface for HTTP API tests inside Testim. Lets teams compose, chain, assert, and ru...Broadcom BlazeMeterContinuous testing platform for API, web, mobile, and performance testing. Exposes a REST API for orchestra...cURL Command Line ToolThe curl command-line tool transfers data to or from a server using URL syntax, supporting protocols includ...Runscope API Monitoring APIREST API for the Runscope (now BlazeMeter API Monitoring) platform. Manages buckets, API tests, environment...Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...GoReplayGoReplay captures and replays live HTTP traffic, enabling developers to test APIs and applications with rea...Mitmproxymitmproxy is a free and open source interactive HTTPS proxy for intercepting, inspecting, modifying, and re...Arga APIPublic REST API for Arga's testing infrastructure — provision digital twins, deploy branches/PRs into sandb...DreddDredd is a language-agnostic command-line tool for validating an API description document against a backend...Noname Active TestingNoname Active Testing enables organizations to test APIs for vulnerabilities and misconfigurations before t...Noname API Security PlatformThe Noname API Security Platform provides comprehensive API security through discovery, posture management,...Keploy Cloud APIREST API for Keploy Cloud providing test generation and execution capabilities, app/test-suite management, ...Keploy MCP ServerHosted, remote Model Context Protocol server (streamable HTTP transport, bearer-token auth, ~80 tools) that...
Minimal 1 Almost no public developer surface
Score breakdown
Frequency
53.4
log-scaled weighted occurrences
Breadth
1.7
spread across providers
Quality lift
30.6
mean composite of providers using it
Cohesion
8.9
strength of nearest seed neighbor
Related tags
Performance Testing 9 co-occurrences
Contract Testing 7 co-occurrences
API Client 7 co-occurrences
API Design 10 co-occurrences
HTTP Client 7 co-occurrences
Quality Assurance 11 co-occurrences
Functional Testing 5 co-occurrences
CI/CD 17 co-occurrences
Where this tag comes from
Provider tag52
Api tag39
Openapi tag1
Openapi op tag1
Cohort brief
Auto-generatedThe 61 providers in the APIs.io catalog tagged API Testing, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
61
all scored
Mean Kin Score
25.4
+4.7 vs catalog 20.7
Mean Agent Readiness
11.2
+1.5 vs catalog 9.7
Spread
5–64.5
median 23.3 · σ 12.3
How the 61 split by band
Exemplar 0Strong 1Developing 7Thin 19Emerging 27Minimal 7
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 24.6 | 17.5 | +7.1 | 61 |
| Operational Transparency | 16.9 | 11.3 | +5.6 | 61 |
| Developer Ergonomics | 22.7 | 17.9 | +4.8 | 61 |
| Discoverability | 64.8 | 60.4 | +4.4 | 61 |
| Contract Governance | 10 | 6.4 | +3.6 | 61 |
| Access Clarity | 24.4 | 22.3 | +2.1 | 61 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 21% | 16% | +5 |
| MCP server (first-party) | 8% | 7% | +1 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 3% | 9% | -6 |
| Security | 95% | 88% | +7 |
| Arazzo workflows | 5% | 2% | +3 |
| Governance rules | 43% | 13% | +30 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Postman 64.5
- 2 Apidog 51.5
- 3 Testmail 44.5
- 4 APIToolkit (Monoscope) 42.9
- 5 Testim Io 42.2
- 6 RapidAPI 42
- 7 _done 41
- 8 Hoppscotch 40.5
- 9 SmartBear 39.2
- 10 Archal 37.9
Top by Agent Readiness
- 1 Postman 36.5
- 2 Agent Diff 30.6
- 3 Testmail 30.6
- 4 Ressl 29.9
- 5 Traceable 29
- 6 _done 28.6
- 7 Microcks 28.6
- 8 Apidog 28.3
- 9 Archal 27.7
- 10 APIToolkit (Monoscope) 25.8
All 61 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
25 August 2026, across 26891
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.