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 →

Exemplar 26 Complete, well-documented, and agent-ready

Ada MCP ServerModel Context Protocol server exposing Ada's management surface to AI assistants — metrics, conversation tr...88.0 Dynatrace Synthetic API v2The Dynatrace Synthetic API v2 provides programmatic access to synthetic monitoring resources including bro...85.6 OpenAI Evals APIManage and run evals in the OpenAI platform.82.5 PostmanPostman is the single platform for collaborative API development used by 35+ million developers. It covers ...82.5 Postman Monitors APIThe Monitors API runs Postman Collections on a recurring schedule to validate API health, performance, and ...82.5 Stripe Test Helpers APIStripe provides a number of resources for testing your integration. Make sure to test the following use cas...82.0 Redocly Respect MonitoringRespect Monitoring is Redocly's continuous, API-aware monitoring product powered by OpenAPI Arazzo workflow...81.2 Datadog Synthetics APIThe Synthetics API allows you to manage API tests and browser tests programmatically. Datadog Synthetics us...80.0 Greenhouse Assessment APIThe Assessment Partner API enables assessment platforms (code testing, video interviewing, personality test...77.3 Scalar API ClientScalar API Client is a fully open-source, offline-first REST API client built on the OpenAPI standard. Supp...76.4 ChecklyCheckly is a monitoring-as-code platform for API and synthetic monitoring with Playwright-based browser che...76.2 Adobe Target APIManage personalization activities, audiences, offers, and deliver experiences across web, mobile, and IoT c...75.9 Hilt Testing APIThe testing API from Hilt — 3 operation(s) for testing.74.6 New Relic Synthetics APIThe New Relic Synthetics API, available through NerdGraph, allows you to programmatically create, update, d...74.4 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...73.8 Amazon B2B Data Interchange Testing APITest and validate mappings, parsing, and conversions73.1 Speakeasy Contract TestingAPI contract test generation using OpenAPI specs and the Arazzo specification. Generates both test code and...72.3 AxonFlow Testing APIPolicy testing and validation70.7 BrowserStack Accessibility Testing APIThe BrowserStack Accessibility Testing API provides REST access to workflow analyzer, assisted tests, websi...68.1 BrowserStack App Accessibility Testing APIThe BrowserStack App Accessibility REST API enables programmatic access to accessibility data for mobile ap...68.1 BrowserStack Automate APIThe BrowserStack Automate REST API provides access to plan, project, build, and session details for Seleniu...68.1 BrowserStack JavaScript Testing APIThe BrowserStack JavaScript Testing API provides HTTPS-based access to run JavaScript unit tests across 300...68.1 BrowserStack Low Code Automation APIThe BrowserStack Low Code Automation REST API enables triggering test suite executions and retrieving build...68.1 BrowserStack Test Management APIThe BrowserStack Test Management API provides REST access to manage test projects, folders, test cases, tes...68.1 BrowserStack Test Reporting and Analytics APIThe BrowserStack Test Reporting and Analytics API provides programmatic access to upload JUnit XML and Allu...68.1 Treblle Aspen API TestingAspen is Treblle's intelligent API testing application for macOS featuring AI-powered capabilities through ...67.4

Strong 14 Solid coverage with minor gaps

Heron Testing APIThe Testing API from Heron — 2 operation(s) for testing.66.2 Singular Testing Console APIBETA integration-testing API. Register a real test device to open a one-hour logging session, then read bac...65.9 Cloud Testing APIThe Cloud Testing API powers Firebase Test Lab, enabling developers to test Android and iOS apps on real an...63.0 Raiffeisenbank (Russia) Testing APIДля получения тестовых данных для интеграции напишите на ecom@raiffeisen.ru. В ответном письме мы отправим ...62.9 Bolt Financial Testing APIThe testing endpoint allows you to test various functionality within Bolt. Create a test credit card to pro...61.4 Playwright APIPlaywright provides a cross-browser automation API for end-to-end testing of web applications. It supports ...60.1 Chrome DevTools ProtocolInstrument, inspect, debug and profile Chromium, Chrome and other Blink-based browsers.58.8 Conviva Validation Timeline API v2Session validation timeline data for QA and sensor-integration testing, queried by viewer_id and/or session...58.3 KORE Wireless Testing APIAPIs that are currently under testing58.2 TestFairy REST APIREST API for managing TestFairy projects, builds, testers, tester groups, sites, webhooks, permissions, fee...58.0 InsomniaInsomnia is an open-source, cross-platform API development platform by Kong for designing, debugging, and t...57.5 JSNAPy APIPython-based snapshot and test framework for Junos devices.57.3 Juniper JSNAPyPython-based tool for snapshot and verification of network device configurations.57.3 Bond Simulation (Sandbox) APISandbox-only endpoints for deterministically testing banking flows before going live — simulate a card tran...56.6

Developing 11 Usable, with meaningful gaps to close

Panaya APIPanaya's REST API surface, including the Test Dynamix APIs (Transaction, Cycles, Folder, Business Process, ...52.1 Defacto Testing APIThe Testing API from Defacto — 5 operation(s) for testing.47.9 Testsigma REST APIREST API to manage Testsigma entities (projects, applications, environments, elements, uploads, test plans)...47.9 handy Testing APIThe Testing API from handy — 1 operation(s) for testing.45.2 Cequence API Security TestingAPI Security Testing extends Cequence into shift-left, performing pre-production OpenAPI conformance and vu...43.8 Ankorstore Testing APIℹ️ This section is dedicated to the testing API during development process. The listed endpoints are **not ...43.5 Launchable APIThe Launchable (CloudBees Smart Tests) service API that the Launchable CLI calls to record builds, create t...42.9 NucleiNuclei is an open source vulnerability scanner from ProjectDiscovery that uses YAML-based templates to find...42.7 ChargerDojo APIChargerDojo API as documented publicly: 31 operations. Contract generated from the documentation by API Eva...41.8 Spring WebFlux TestingTesting support for WebFlux applications including WebTestClient for integration testing of server endpoint...41.8 Trellix API ExplorerInteractive API documentation and testing tool for Trellix security products formerly under the FireEye bra...40.5

Thin 25 Limited public surface area

Selenium GridSelenium Grid allows you to run test cases in different machines across different platforms. It enables the...39.2 Selenium WebDriverWebDriver is a browser automation framework that accepts commands and sends them to a browser. It is implem...39.2 Ciena Emulation Cloud APICiena Emulation Cloud is an open application development environment enabling developers to create, test, a...37.9 Pearson VUE Web ServicesThe integration surface Pearson VUE offers test owners for candidate registration, scheduling and results d...37.9 Cypress Cloud Data Extract APIEnterprise reporting API that returns test and run analytics and raw test-result data from Cypress Cloud. R...37.7 Beeceptor APIBeeceptor's management API provides programmatic access to create and manage mock endpoints, rules, and tra...36.3 Promptfoo CLIThe Promptfoo CLI is the primary entry point for running prompt and model evaluations from the command line...36.0 CIP TestingThe CIP Testing working group runs continuous-integration and hardware-in-the-loop testing on member-suppli...33.3 Playground GraphQL APIGraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive ...33.2 Pact Broker APIPact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact con...32.1 AGL LAVA Test Lab APIThe REST API of AGL's public LAVA (Linaro Automated Validation Architecture) continuous integration lab, wh...32.0 AmbassadorAmbassador offers a suite of products designed to deliver API developer experiences that fuel innovation. T...31.8 Ambassador Blackbird API Development PlatformBlackbird is an API development platform that helps developers design, build, test, and manage APIs with AI...31.8 Glama MCP InspectorBrowser-based MCP debugger that spins up an ephemeral sandbox from a server URL. Lets developers exercise t...31.3 Mock Bank APIThe Mock Bank API provides a sandbox environment for testing and developing banking integrations without co...30.1 Thumbtack Testing APIThe Testing API from Thumbtack — 1 operation(s) for testing.29.8 K6k6 is an open source load testing tool by Grafana Labs for testing the performance and reliability of APIs ...29.7 Xfers Testing APIAPI for testing purposes29.6 XRPL JSON-RPC API (Testnet)JSON-RPC interface to the XRP Ledger Altnet testnet for development and testing. Supports the same method s...29.6 XRPL WebSocket API (Testnet)WebSocket interface to the XRP Ledger Altnet testnet for development and testing. Supports real-time subscr...29.6 Tenderly Virtual TestNets REST APIProvision and manage production-mirroring virtual blockchain environments with state sync, unlimited faucet...29.1 Kalshi Trade API (Demo)Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances ...28.9 Wove Testing APITest endpoints for API validation28.8 Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...28.7 REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...28.3

Emerging 31 Early or largely undocumented

Cucumber JVMJava/JVM implementation of Cucumber supporting Java, Kotlin, Scala, and other JVM languages. Distributed vi...25.7 Cucumber RubyRuby implementation of Cucumber, the original Cucumber project. Distributed as the cucumber gem on RubyGems.25.7 Cucumber.jsJavaScript/Node.js implementation of Cucumber for running BDD tests in Node and the browser. Distributed as...25.7 Apache JMeterApache JMeter is a load testing and performance measurement tool for web applications, databases, FTP serve...25.0 TUF Conformance Test SuiteThe official TUF client conformance test suite for verifying that TUF client implementations correctly impl...24.3 HeadSpin REST API (v0)HeadSpin's v0 REST API for authentication, real-device management, capture sessions, app (APK/IPA) instrume...24.1 Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...23.6 SuperTestSuperTest is a Node.js library for testing HTTP servers by providing a high-level abstraction for HTTP asse...22.6 RISC-V Spike ISA SimulatorSpike is the official RISC-V ISA Simulator and the golden reference implementation for RISC-V. It simulates...21.7 Mockito CoreThe core Mockito mocking framework for creating mock objects, stubbing methods, verifying invocations, and ...21.5 Vegeta Load Testing ToolVegeta is an open source HTTP load testing tool and library written in Go for generating constant request r...21.2 JUnit 4 VintageThe legacy version of JUnit still widely used in Java projects.20.6 JUnit 5 JupiterThe next generation of JUnit for Java 8 and beyond, providing an expressive API for writing tests and exten...20.6 Modbus Simulator Control APIA small self-hosted HTTP control API served by the OT Fabric modbus-simulator when started with --control (...18.8 KarateKarate is an open source API test automation framework combining API testing, mocks, and performance testin...18.6 Mock Service WorkerMock Service Worker (MSW) is an open-source library for mocking REST, GraphQL, WebSocket, and Server-Sent E...17.6 Retrofit MockProvides behavior-simulating implementations of Retrofit interfaces for local testing without requiring a n...17.5 Testcontainers Cloud Agent APIThe Testcontainers Cloud Agent API enables CI/CD pipelines and desktop environments to allocate hosted Dock...17.5 Testcontainers Open-Source LibrariesA family of open-source libraries providing a programmatic API for spinning up and tearing down Docker cont...17.5 Waldo Scripting (Core) APIW3C WebDriver + Appium-compatible endpoint for creating sessions on Waldo cloud devices and driving native,...16.9 NamekoNameko is a microservices framework for Python that provides tools for building, testing, and running servi...16.5 Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...16.4 GatlingGatling is an open source load and performance testing framework for web applications and APIs with a Scala...15.6 Gatling Enterprise Public APIThe Gatling Enterprise Edition public API enables you to trigger runs or fetch run results and metrics, inc...15.6 NewmanNewman is the open source command-line companion for Postman that runs Postman collections from the CLI for...13.5 ReqnrollReqnroll is the open-source community continuation and fork of SpecFlow, maintaining full backward compatib...13.2 SpecFlowSpecFlow is a BDD framework for .NET that bridges the communication gap between domain experts and develope...13.2 NUnit Framework APIThe core NUnit testing framework programming API for writing and executing unit tests in .NET applications....12.9 COBOL CheckCOBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code w...12.7 PrismPrism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock response...12.4 Jest Core APICore testing framework API for writing and running tests, including globals, expect assertions, mock functi...11.6

Minimal 4 Almost no public developer surface

Mirage JSMirage JS is a JavaScript library for mocking APIs. It enables frontend developers to build complete featur...10.6 JMock Core APICore library for creating mock objects and defining expectations in Java tests using an expressive DSL. Sup...10.5 PortmanPortman is an open source CLI tool that auto-generates Postman collections with contract and variation test...10.5 Nordson Corporation APIThe Nordson Corporation API provides access to platform services and data for enterprise integration and au...8.1

Companies reaching this through an API (48)

These companies publish an API, specification or operation carrying “Testing” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Ada Adobe Suite Amazon B2B Data Interchange Ankorstore Automotive Grade Linux AxonFlow Bolt Financial Bond Cequence Security Ciena Civil Infrastructure Platform Conviva Datadog Defacto Dynatrace Glama Google Android Google Chrome Greenhouse handy Heron Hilt Juniper Networks Kalshi Kong KORE Wireless New Relic Open Mainframe Project OpenAI OT Fabric Promptfoo Raiffeisenbank (Russia) Redocly Retrofit RISC-V International Sandbox Banking Scalar Schema.org Singular Spring WebFlux Stripe Tenderly The Update Framework (TUF) Thumbtack Trellix Wove Xfers XRP Ledger

Score breakdown

Frequency

62.9

log-scaled weighted occurrences

Breadth

2.4

spread across providers

Quality lift

34.1

mean composite of providers using it

Cohesion

11.0

strength of nearest seed neighbor

Where this tag sits

186 providers carry this tag directly, and 251 counting the 6 narrower tags below — 65 more to reach.

API Testing 54 providers Test Automation 32 providers QA 31 providers Software Testing 9 providers Load Testing 12 providers Mocking 22 providers

Where this tag comes from

Provider tag186

Api tag110

Openapi tag11

Openapi op tag45

Cohort brief

Auto-generated

The 170 providers in the APIs.io catalog tagged Testing, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

170

of 186 in the catalog

Mean Kin Score

35.4

+11.3 vs catalog 24.1

Mean Agent Readiness

19.4

+5.3 vs catalog 14.1

Spread

0–82.5

median 33.5 · σ 18.8

How the 170 split by band

Exemplar 10Strong 26Developing 30Thin 41Emerging 48Minimal 15

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	38.6	24.5	+14.1	170
Contract Quality	29.9	18.6	+11.3	170
Access Clarity	40.9	30	+10.9	170
Operational Transparency	22.8	13.2	+9.6	170
Contract Governance	15.3	9.7	+5.6	170
Discoverability	63.9	59.1	+4.8	170

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)	29%	18%	+11
MCP server (first-party)	27%	16%	+11
Agent Skills	0%	0%	0
OAuth scopes	8%	13%	-5
Security	96%	99%	-3
Arazzo workflows	3%	1%	+2
Governance rules	64%	36%	+28

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 82.5
2 Currents 77.7
3 Checkly 76.2
4 Speakeasy 72.3
5 UiPath 71
6 Roark 69
7 Tricentis 68.6
8 TempMailGrab API 68.5
9 BrowserStack 68.1
10 Treblle 67.4

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

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Testing

Providers using this tag (186)

APIs with this tag (111)