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 21 Complete, well-documented, and agent-ready

Dynatrace Synthetic API v2The Dynatrace Synthetic API v2 provides programmatic access to synthetic monitoring resources including bro...86.3 OpenAI Evals APIManage and run evals in the OpenAI platform.84.8 Ada MCP ServerModel Context Protocol server exposing Ada's management surface to AI assistants — metrics, conversation tr...84.4 Redocly Respect MonitoringRespect Monitoring is Redocly's continuous, API-aware monitoring product powered by OpenAPI Arazzo workflow...82.6 Stripe Test Helpers APIStripe provides a number of resources for testing your integration. Make sure to test the following use cas...81.6 PostmanPostman is the single platform for collaborative API development used by 35+ million developers. It covers ...79.6 Postman Monitors APIThe Monitors API runs Postman Collections on a recurring schedule to validate API health, performance, and ...79.6 Datadog Synthetics APIThe Synthetics API allows you to manage API tests and browser tests programmatically. Datadog Synthetics us...79.1 Adobe Target APIManage personalization activities, audiences, offers, and deliver experiences across web, mobile, and IoT c...78.3 ChecklyCheckly is a monitoring-as-code platform for API and synthetic monitoring with Playwright-based browser che...74.0 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...73.2 New Relic Synthetics APIThe New Relic Synthetics API, available through NerdGraph, allows you to programmatically create, update, d...72.3 Scalar API ClientScalar API Client is a fully open-source, offline-first REST API client built on the OpenAPI standard. Supp...71.7 BrowserStack Accessibility Testing APIThe BrowserStack Accessibility Testing API provides REST access to workflow analyzer, assisted tests, websi...67.8 BrowserStack App Accessibility Testing APIThe BrowserStack App Accessibility REST API enables programmatic access to accessibility data for mobile ap...67.8 BrowserStack Automate APIThe BrowserStack Automate REST API provides access to plan, project, build, and session details for Seleniu...67.8 BrowserStack JavaScript Testing APIThe BrowserStack JavaScript Testing API provides HTTPS-based access to run JavaScript unit tests across 300...67.8 BrowserStack Low Code Automation APIThe BrowserStack Low Code Automation REST API enables triggering test suite executions and retrieving build...67.8 BrowserStack Test Management APIThe BrowserStack Test Management API provides REST access to manage test projects, folders, test cases, tes...67.8 BrowserStack Test Reporting and Analytics APIThe BrowserStack Test Reporting and Analytics API provides programmatic access to upload JUnit XML and Allu...67.8 Speakeasy Contract TestingAPI contract test generation using OpenAPI specs and the Arazzo specification. Generates both test code and...67.6

Strong 7 Solid coverage with minor gaps

Singular Testing Console APIBETA integration-testing API. Register a real test device to open a one-hour logging session, then read bac...65.8 Bolt Financial Testing APIThe testing endpoint allows you to test various functionality within Bolt. Create a test credit card to pro...65.0 Treblle Aspen API TestingAspen is Treblle's intelligent API testing application for macOS featuring AI-powered capabilities through ...63.2 Heron Testing APIThe Testing API from Heron — 2 operation(s) for testing.61.6 JSNAPy APIPython-based snapshot and test framework for Junos devices.59.7 Juniper JSNAPyPython-based tool for snapshot and verification of network device configurations.59.7 Conviva Validation Timeline API v2Session validation timeline data for QA and sensor-integration testing, queried by viewer_id and/or session...58.4

Developing 21 Usable, with meaningful gaps to close

InsomniaInsomnia is an open-source, cross-platform API development platform by Kong for designing, debugging, and t...53.9 TestFairy REST APIREST API for managing TestFairy projects, builds, testers, tester groups, sites, webhooks, permissions, fee...53.7 Panaya APIPanaya's REST API surface, including the Test Dynamix APIs (Transaction, Cycles, Folder, Business Process, ...49.3 Bond Simulation (Sandbox) APISandbox-only endpoints for deterministically testing banking flows before going live — simulate a card tran...48.2 Cloud Testing APIThe Cloud Testing API powers Firebase Test Lab, enabling developers to test Android and iOS apps on real an...47.8 Chrome DevTools ProtocolInstrument, inspect, debug and profile Chromium, Chrome and other Blink-based browsers.47.5 KORE Wireless Testing APIAPIs that are currently under testing46.6 Defacto Testing APIThe Testing API from Defacto — 5 operation(s) for testing.45.3 Amazon B2B Data Interchange Testing APITest and validate mappings, parsing, and conversions44.9 Testsigma REST APIREST API to manage Testsigma entities (projects, applications, environments, elements, uploads, test plans)...43.6 Spring WebFlux TestingTesting support for WebFlux applications including WebTestClient for integration testing of server endpoint...43.5 Trellix API ExplorerInteractive API documentation and testing tool for Trellix security products formerly under the FireEye bra...43.3 Ankorstore Testing APIℹ️ This section is dedicated to the testing API during development process. The listed endpoints are **not ...43.2 Cequence API Security TestingAPI Security Testing extends Cequence into shift-left, performing pre-production OpenAPI conformance and vu...42.7 Launchable APIThe Launchable (CloudBees Smart Tests) service API that the Launchable CLI calls to record builds, create t...42.0 NucleiNuclei is an open source vulnerability scanner from ProjectDiscovery that uses YAML-based templates to find...41.8 Promptfoo CLIThe Promptfoo CLI is the primary entry point for running prompt and model evaluations from the command line...41.7 handy Testing APIThe Testing API from handy — 1 operation(s) for testing.40.8 CIP TestingThe CIP Testing working group runs continuous-integration and hardware-in-the-loop testing on member-suppli...39.9 Selenium GridSelenium Grid allows you to run test cases in different machines across different platforms. It enables the...39.6 Selenium WebDriverWebDriver is a browser automation framework that accepts commands and sends them to a browser. It is implem...39.6

Thin 28 Limited public surface area

Ciena Emulation Cloud APICiena Emulation Cloud is an open application development environment enabling developers to create, test, a...38.1 Cypress Cloud Data Extract APIEnterprise reporting API that returns test and run analytics and raw test-result data from Cypress Cloud. R...37.8 Beeceptor APIBeeceptor's management API provides programmatic access to create and manage mock endpoints, rules, and tra...37.4 Thumbtack Testing APIThe Testing API from Thumbtack — 1 operation(s) for testing.35.6 Kalshi Trade API (Demo)Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances ...35.5 AmbassadorAmbassador offers a suite of products designed to deliver API developer experiences that fuel innovation. T...35.4 Ambassador Blackbird API Development PlatformBlackbird is an API development platform that helps developers design, build, test, and manage APIs with AI...35.4 Pearson VUE Web ServicesThe integration surface Pearson VUE offers test owners for candidate registration, scheduling and results d...34.9 AGL LAVA Test Lab APIThe REST API of AGL's public LAVA (Linaro Automated Validation Architecture) continuous integration lab, wh...33.2 Pact Broker APIPact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact con...33.2 Mock Bank APIThe Mock Bank API provides a sandbox environment for testing and developing banking integrations without co...32.8 Greenhouse Assessment APIThe Assessment Partner API enables assessment platforms (code testing, video interviewing, personality test...31.9 Tenderly Virtual TestNets REST APIProvision and manage production-mirroring virtual blockchain environments with state sync, unlimited faucet...31.7 Playground GraphQL APIGraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive ...31.5 Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...31.4 XRPL JSON-RPC API (Testnet)JSON-RPC interface to the XRP Ledger Altnet testnet for development and testing. Supports the same method s...31.3 XRPL WebSocket API (Testnet)WebSocket interface to the XRP Ledger Altnet testnet for development and testing. Supports real-time subscr...31.3 K6k6 is an open source load testing tool by Grafana Labs for testing the performance and reliability of APIs ...30.7 Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...30.1 Glama MCP InspectorBrowser-based MCP debugger that spins up an ephemeral sandbox from a server URL. Lets developers exercise t...29.6 REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...28.9 Xfers Testing APIAPI for testing purposes28.7 Cucumber JVMJava/JVM implementation of Cucumber supporting Java, Kotlin, Scala, and other JVM languages. Distributed vi...28.2 Cucumber RubyRuby implementation of Cucumber, the original Cucumber project. Distributed as the cucumber gem on RubyGems.28.2 Cucumber.jsJavaScript/Node.js implementation of Cucumber for running BDD tests in Node and the browser. Distributed as...28.2 Testcontainers Cloud Agent APIThe Testcontainers Cloud Agent API enables CI/CD pipelines and desktop environments to allocate hosted Dock...27.2 Testcontainers Open-Source LibrariesA family of open-source libraries providing a programmatic API for spinning up and tearing down Docker cont...27.2 TUF Conformance Test SuiteThe official TUF client conformance test suite for verifying that TUF client implementations correctly impl...26.6

Emerging 30 Early or largely undocumented

Wove Testing APITest endpoints for API validation25.9 Apache JMeterApache JMeter is a load testing and performance measurement tool for web applications, databases, FTP serve...25.6 Azure Playwright Testing Service APIAzure Playwright Testing is a managed cloud service for running Playwright tests at scale. It provides brow...24.9 Playwright APIPlaywright provides a cross-browser automation API for end-to-end testing of web applications. It supports ...24.9 Build and Test APIsAPIs for build automation, test frameworks, code coverage tools, and quality gates that verify software cor...24.2 SuperTestSuperTest is a Node.js library for testing HTTP servers by providing a high-level abstraction for HTTP asse...24.2 RISC-V Spike ISA SimulatorSpike is the official RISC-V ISA Simulator and the golden reference implementation for RISC-V. It simulates...23.0 HeadSpin REST API (v0)HeadSpin's v0 REST API for authentication, real-device management, capture sessions, app (APK/IPA) instrume...22.9 Vegeta Load Testing ToolVegeta is an open source HTTP load testing tool and library written in Go for generating constant request r...22.9 Mockito CoreThe core Mockito mocking framework for creating mock objects, stubbing methods, verifying invocations, and ...22.1 JUnit 4 VintageThe legacy version of JUnit still widely used in Java projects.22.0 JUnit 5 JupiterThe next generation of JUnit for Java 8 and beyond, providing an expressive API for writing tests and exten...22.0 Mock Service WorkerMock Service Worker (MSW) is an open-source library for mocking REST, GraphQL, WebSocket, and Server-Sent E...20.1 KarateKarate is an open source API test automation framework combining API testing, mocks, and performance testin...19.2 Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...18.9 NamekoNameko is a microservices framework for Python that provides tools for building, testing, and running servi...18.1 Retrofit MockProvides behavior-simulating implementations of Retrofit interfaces for local testing without requiring a n...18.1 GatlingGatling is an open source load and performance testing framework for web applications and APIs with a Scala...17.0 Gatling Enterprise Public APIThe Gatling Enterprise Edition public API enables you to trigger runs or fetch run results and metrics, inc...17.0 Waldo Scripting (Core) APIW3C WebDriver + Appium-compatible endpoint for creating sessions on Waldo cloud devices and driving native,...16.9 ReqnrollReqnroll is the open-source community continuation and fork of SpecFlow, maintaining full backward compatib...16.1 SpecFlowSpecFlow is a BDD framework for .NET that bridges the communication gap between domain experts and develope...16.1 NewmanNewman is the open source command-line companion for Postman that runs Postman collections from the CLI for...15.1 PrismPrism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock response...14.9 COBOL CheckCOBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code w...13.9 Jest Core APICore testing framework API for writing and running tests, including globals, expect assertions, mock functi...13.6 NUnit Framework APIThe core NUnit testing framework programming API for writing and executing unit tests in .NET applications....13.6 Mirage JSMirage JS is a JavaScript library for mocking APIs. It enables frontend developers to build complete featur...13.5 JMock Core APICore library for creating mock objects and defining expectations in Java tests using an expressive DSL. Sup...13.2 PortmanPortman is an open source CLI tool that auto-generates Postman collections with contract and variation test...12.4

Minimal 1 Almost no public developer surface

Nordson Corporation APIThe Nordson Corporation API provides access to platform services and data for enterprise integration and au...9.5

Companies reaching this through an API (46)

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 Bolt Financial Bond Cequence Security Ciena Civil Infrastructure Platform Conviva Datadog Defacto Dynatrace Glama Google Android Google Chrome Greenhouse Grubhub handy Heron Juniper Networks Kalshi Kong KORE Wireless New Relic Open Mainframe Project OpenAI Promptfoo Redocly Retrofit RISC-V International Sandbox Banking Scalar Schema.org Singular Software Development Lifecycle Spring WebFlux Stripe Tenderly The Update Framework (TUF) Thumbtack Trellix Wove Xfers XRP Ledger

Score breakdown

Frequency

65.2

log-scaled weighted occurrences

Breadth

3.5

spread across providers

Quality lift

39.5

mean composite of providers using it

Cohesion

12.0

strength of nearest seed neighbor

Where this tag sits

136 providers carry this tag directly, and 190 counting the 6 narrower tags below — 54 more to reach.

API Testing 50 providers Test Automation 30 providers QA 22 providers Software Testing 8 providers Load Testing 12 providers Mocking 20 providers

Where this tag comes from

Provider tag136

Api tag109

Openapi tag8

Openapi op tag26

Cohort brief

Auto-generated

The 129 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

129

all scored

Mean Kin Score

33.8

+10.9 vs catalog 22.9

Mean Agent Readiness

17.6

+5.7 vs catalog 11.9

Spread

0–79.6

median 33.3 · σ 16.9

How the 129 split by band

Exemplar 5Strong 9Developing 34Thin 37Emerging 34Minimal 10

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	37.8	23.2	+14.6	129
Operational Transparency	26.8	13.7	+13.1	129
Contract Quality	27.9	17.6	+10.3	129
Access Clarity	35.9	26.5	+9.4	129
Discoverability	62.2	58.1	+4.1	129
Contract Governance	9.5	6.3	+3.2	129

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)	26%	14%	+12
MCP server (first-party)	22%	12%	+10
Agent Skills	0%	0%	0
OAuth scopes	6%	11%	-5
Security	95%	98%	-3
Arazzo workflows	4%	2%	+2
Governance rules	26%	14%	+12

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 79.6
2 Checkly 74
3 Tricentis 68
4 BrowserStack 67.8
5 Speakeasy 67.6
6 UiPath 66.3
7 Stack Moxie 64.5
8 Treblle 63.2
9 TempMailGrab API 62.4
10 Artillery 57.4

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 →

Call it yourself

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This tag

curl "https://apis.io/api/v1/tags/testing"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/testing"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/testing/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Testing

Providers using this tag (136)

APIs with this tag (108)