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 11 Complete, well-documented, and agent-ready

Dynatrace Synthetic API v2The Dynatrace Synthetic API v2 provides programmatic access to synthetic monitoring resources including bro...86.5 Ada MCP ServerModel Context Protocol server exposing Ada's management surface to AI assistants — metrics, conversation tr...83.2 OpenAI Evals APIManage and run evals in the OpenAI platform.82.9 Stripe Test Helpers APIStripe provides a number of resources for testing your integration. Make sure to test the following use cas...79.7 Adobe Target APIManage personalization activities, audiences, offers, and deliver experiences across web, mobile, and IoT c...75.6 Redocly Respect MonitoringRespect Monitoring is Redocly's continuous, API-aware monitoring product powered by OpenAPI Arazzo workflow...74.6 PostmanPostman is the single platform for collaborative API development used by 35+ million developers. It covers ...72.5 Postman Monitors APIThe Monitors API runs Postman Collections on a recurring schedule to validate API health, performance, and ...72.5 ChecklyCheckly is a monitoring-as-code platform for API and synthetic monitoring with Playwright-based browser che...71.1 Bolt Financial Testing APIThe testing endpoint allows you to test various functionality within Bolt. Create a test credit card to pro...70.1 New Relic Synthetics APIThe New Relic Synthetics API, available through NerdGraph, allows you to programmatically create, update, d...68.1

Strong 17 Solid coverage with minor gaps

BrowserStack Accessibility Testing APIThe BrowserStack Accessibility Testing API provides REST access to workflow analyzer, assisted tests, websi...66.1 BrowserStack App Accessibility Testing APIThe BrowserStack App Accessibility REST API enables programmatic access to accessibility data for mobile ap...66.1 BrowserStack Automate APIThe BrowserStack Automate REST API provides access to plan, project, build, and session details for Seleniu...66.1 BrowserStack JavaScript Testing APIThe BrowserStack JavaScript Testing API provides HTTPS-based access to run JavaScript unit tests across 300...66.1 BrowserStack Low Code Automation APIThe BrowserStack Low Code Automation REST API enables triggering test suite executions and retrieving build...66.1 BrowserStack Test Management APIThe BrowserStack Test Management API provides REST access to manage test projects, folders, test cases, tes...66.1 BrowserStack Test Reporting and Analytics APIThe BrowserStack Test Reporting and Analytics API provides programmatic access to upload JUnit XML and Allu...66.1 Heron Testing APIThe Testing API from Heron — 2 operation(s) for testing.64.8 Test Observer APITest Observer is Canonical's dashboard for tracking test execution across Ubuntu artefacts — snaps, debs, c...64.4 Testflinger APITestflinger is Canonical's hardware test-orchestration service. Its REST API accepts test jobs against name...64.4 Datadog Synthetics APIThe Synthetics API allows you to manage API tests and browser tests programmatically. Datadog Synthetics us...63.6 Singular Testing Console APIBETA integration-testing API. Register a real test device to open a one-hour logging session, then read bac...63.0 TempMailGrab REST APIVersioned v1 REST API for creating private disposable inboxes, reading parsed messages with extracted OTPs ...62.6 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...58.0 Treblle Aspen API TestingAspen is Treblle's intelligent API testing application for macOS featuring AI-powered capabilities through ...55.8 Conviva Validation Timeline API v2Session validation timeline data for QA and sensor-integration testing, queried by viewer_id and/or session...55.6 Salesforce Automation Testing APIApex test execution54.7

Developing 26 Usable, with meaningful gaps to close

Speakeasy Contract TestingAPI contract test generation using OpenAPI specs and the Arazzo specification. Generates both test code and...53.3 TestFairy REST APIREST API for managing TestFairy projects, builds, testers, tester groups, sites, webhooks, permissions, fee...52.6 CIP TestingThe CIP Testing working group runs continuous-integration and hardware-in-the-loop testing on member-suppli...52.4 Bond Simulation (Sandbox) APISandbox-only endpoints for deterministically testing banking flows before going live — simulate a card tran...51.0 KORE Wireless Testing APIAPIs that are currently under testing50.1 Uzum CheckoutPayment gateway for websites and mobile applications. Card payments (Visa, Mastercard, Uzcard, Humo), one-s...49.5 Scalar API ClientFully open-source, offline-first API client built on the OpenAPI standard - a Postman/Insomnia alternative ...49.4 Amazon B2B Data Interchange Testing APITest and validate mappings, parsing, and conversions48.3 Defacto Testing APIThe Testing API from Defacto — 5 operation(s) for testing.48.0 Chef InSpecInSpec is an open-source language and runner for security and compliance testing. It is consumed via the In...47.5 Panaya APIPanaya's REST API surface, including the Test Dynamix APIs (Transaction, Cycles, Folder, Business Process, ...47.2 Chrome DevTools ProtocolInstrument, inspect, debug and profile Chromium, Chrome and other Blink-based browsers.46.2 Spring WebFlux TestingTesting support for WebFlux applications including WebTestClient for integration testing of server endpoint...45.3 API Dash APIsThe API Dash APIs are a free, keyless, open-source REST utility API published by foss42 alongside the API D...45.2 Cloud Testing APIThe Cloud Testing API powers Firebase Test Lab, enabling developers to test Android and iOS apps on real an...44.8 Trellix API ExplorerInteractive API documentation and testing tool for Trellix security products formerly under the FireEye bra...43.6 JSNAPy APIPython-based snapshot and test framework for Junos devices.43.0 Juniper JSNAPyPython-based tool for snapshot and verification of network device configurations.43.0 Ankorstore Testing APIℹ️ This section is dedicated to the testing API during development process. The listed endpoints are **not ...42.9 Ciena Emulation Cloud APICiena Emulation Cloud is an open application development environment enabling developers to create, test, a...42.3 NucleiNuclei is an open source vulnerability scanner from ProjectDiscovery that uses YAML-based templates to find...42.0 Testsigma REST APIREST API to manage Testsigma entities (projects, applications, environments, elements, uploads, test plans)...41.2 Selenium GridSelenium Grid allows you to run test cases in different machines across different platforms. It enables the...40.6 Selenium WebDriverWebDriver is a browser automation framework that accepts commands and sends them to a browser. It is implem...40.6 Launchable APIThe Launchable (CloudBees Smart Tests) service API that the Launchable CLI calls to record builds, create t...40.2 handy Testing APIThe Testing API from handy — 1 operation(s) for testing.39.4

Thin 41 Limited public surface area

Beeceptor APIBeeceptor's management API provides programmatic access to create and manage mock endpoints, rules, and tra...39.0 InsomniaInsomnia is an open-source, cross-platform API development platform by Kong for designing, debugging, and t...38.8 Cequence API Security TestingAPI Security Testing extends Cequence into shift-left, performing pre-production OpenAPI conformance and vu...38.2 Kalshi Trade API (Demo)Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances ...37.6 Cypress Cloud Data Extract APIEnterprise reporting API that returns test and run analytics and raw test-result data from Cypress Cloud. R...37.3 Promptfoo CLIThe Promptfoo CLI is the primary entry point for running prompt and model evaluations from the command line...36.9 AmbassadorAmbassador offers a suite of products designed to deliver API developer experiences that fuel innovation. T...36.7 Ambassador Blackbird API Development PlatformBlackbird is an API development platform that helps developers design, build, test, and manage APIs with AI...36.7 Thumbtack Testing APIThe Testing API from Thumbtack — 1 operation(s) for testing.36.2 Pact Broker APIPact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact con...35.0 pytestpytest is the Python testing framework supporting test suite organization through test classes, directories...34.9 Codecov APIREST API for Codecov code coverage reporting service, enabling programmatic access to coverage reports, bra...34.6 Coveralls APIREST API for Coveralls code coverage history and statistics service, tracking test coverage over time and i...34.6 Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...34.6 Katalon TestOps APIAPI for Katalon TestOps test automation platform, providing endpoints for test case management, test execut...34.6 PractiTest APIREST API for PractiTest test management platform supporting test case libraries, test runs, requirements, d...34.6 SonarQube APIREST API for SonarQube code quality and security analysis platform, supporting test coverage metrics, code ...34.6 TestRail APIREST API for TestRail test case management system, enabling programmatic creation, update, and retrieval of...34.6 Zephyr Scale APIREST API for Zephyr Scale test management in Jira Cloud, supporting test case creation, test cycles, test e...34.6 Mock Bank APIThe Mock Bank API provides a sandbox environment for testing and developing banking integrations without co...34.3 Cucumber APIREST API and tooling for Cucumber BDD framework supporting test-first development with Gherkin feature file...32.9 Tenderly Virtual TestNets REST APIProvision and manage production-mirroring virtual blockchain environments with state sync, unlimited faucet...32.9 K6k6 is an open source load testing tool by Grafana Labs for testing the performance and reliability of APIs ...32.6 Pearson VUE Web ServicesThe integration surface Pearson VUE offers test owners for candidate registration, scheduling and results d...32.3 XRPL JSON-RPC API (Testnet)JSON-RPC interface to the XRP Ledger Altnet testnet for development and testing. Supports the same method s...32.1 XRPL WebSocket API (Testnet)WebSocket interface to the XRP Ledger Altnet testnet for development and testing. Supports real-time subscr...32.1 Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...31.7 Playground GraphQL APIGraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive ...31.5 Playground REST APIFree stateful mock REST API with session-scoped mutation overlays, dynamic collections, media generators, c...31.5 Glama MCP InspectorBrowser-based MCP debugger that spins up an ephemeral sandbox from a server URL. Lets developers exercise t...30.3 REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...30.3 Xfers Testing APIAPI for testing purposes30.3 Cucumber JVMJava/JVM implementation of Cucumber supporting Java, Kotlin, Scala, and other JVM languages. Distributed vi...29.4 Cucumber RubyRuby implementation of Cucumber, the original Cucumber project. Distributed as the cucumber gem on RubyGems.29.4 Cucumber.jsJavaScript/Node.js implementation of Cucumber for running BDD tests in Node and the browser. Distributed as...29.4 Testcontainers Cloud Agent APIThe Testcontainers Cloud Agent API enables CI/CD pipelines and desktop environments to allocate hosted Dock...29.2 Testcontainers Open-Source LibrariesA family of open-source libraries providing a programmatic API for spinning up and tearing down Docker cont...29.2 TestRail APIREST API for TestRail test management including test plans, test runs, milestones, and reporting, enabling ...28.0 TUF Conformance Test SuiteThe official TUF client conformance test suite for verifying that TUF client implementations correctly impl...28.0 Greenhouse Assessment APIThe Assessment Partner API enables assessment platforms (code testing, video interviewing, personality test...26.6 Apache JMeterApache JMeter is a load testing and performance measurement tool for web applications, databases, FTP serve...26.3

Emerging 34 Early or largely undocumented

Azure Playwright Testing Service APIAzure Playwright Testing is a managed cloud service for running Playwright tests at scale. It provides brow...25.5 Playwright APIPlaywright provides a cross-browser automation API for end-to-end testing of web applications. It supports ...25.5 Vegeta Load Testing ToolVegeta is an open source HTTP load testing tool and library written in Go for generating constant request r...25.2 Build and Test APIsAPIs for build automation, test frameworks, code coverage tools, and quality gates that verify software cor...25.0 Wove Testing APITest endpoints for API validation24.3 RISC-V Spike ISA SimulatorSpike is the official RISC-V ISA Simulator and the golden reference implementation for RISC-V. It simulates...23.6 JUnit 4 VintageThe legacy version of JUnit still widely used in Java projects.23.2 JUnit 5 JupiterThe next generation of JUnit for Java 8 and beyond, providing an expressive API for writing tests and exten...23.2 BehaveBehave is a Python BDD framework inspired by Cucumber that enables teams to write behavior specifications i...22.5 CucumberCucumber is the world's most popular BDD framework, supporting Java, JavaScript, Ruby, Python, and C#. It u...22.5 JBehaveJBehave is a pioneering BDD framework for Java and JVM languages. It supports web, REST API, and microservi...22.5 SpecFlowSpecFlow is a BDD framework for .NET developers, enabling teams to write behavior specifications in Gherkin...22.5 SuperTestSuperTest is a Node.js library for testing HTTP servers by providing a high-level abstraction for HTTP asse...22.1 Mock Service WorkerMock Service Worker (MSW) is an open-source library for mocking REST, GraphQL, WebSocket, and Server-Sent E...21.9 HeadSpin REST API (v0)HeadSpin's v0 REST API for authentication, real-device management, capture sessions, app (APK/IPA) instrume...21.8 KarateKarate is an open source API test automation framework combining API testing, mocks, and performance testin...20.8 NamekoNameko is a microservices framework for Python that provides tools for building, testing, and running servi...20.8 Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...19.8 Retrofit MockProvides behavior-simulating implementations of Retrofit interfaces for local testing without requiring a n...18.0 Waldo Scripting (Core) APIW3C WebDriver + Appium-compatible endpoint for creating sessions on Waldo cloud devices and driving native,...17.9 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 Mockito CoreThe core Mockito mocking framework for creating mock objects, stubbing methods, verifying invocations, and ...17.0 ReqnrollReqnroll is the open-source community continuation and fork of SpecFlow, maintaining full backward compatib...17.0 SpecFlowSpecFlow is a BDD framework for .NET that bridges the communication gap between domain experts and develope...17.0 NewmanNewman is the open source command-line companion for Postman that runs Postman collections from the CLI for...16.7 PrismPrism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock response...16.5 Jest Core APICore testing framework API for writing and running tests, including globals, expect assertions, mock functi...15.3 NUnit Framework APIThe core NUnit testing framework programming API for writing and executing unit tests in .NET applications....15.3 Mirage JSMirage JS is a JavaScript library for mocking APIs. It enables frontend developers to build complete featur...15.1 JMock Core APICore library for creating mock objects and defining expectations in Java tests using an expressive DSL. Sup...14.9 PortmanPortman is an open source CLI tool that auto-generates Postman collections with contract and variation test...14.9 COBOL CheckCOBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code w...13.6 Nordson Corporation APIThe Nordson Corporation API provides access to platform services and data for enterprise integration and au...11.2

Companies reaching this through an API (49)

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

Score breakdown

Frequency

66.5

log-scaled weighted occurrences

Breadth

3.8

spread across providers

Quality lift

36.5

mean composite of providers using it

Cohesion

11.4

strength of nearest seed neighbor

Where this tag comes from

Provider tag139

Api tag129

Openapi tag12

Openapi op tag37

Cohort brief

Auto-generated

The 131 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

131

all scored

Mean Kin Score

33.1

+9.2 vs catalog 23.9

Mean Agent Readiness

16.8

+4.8 vs catalog 12

Spread

5–72.5

median 33.2 · σ 14.9

How the 131 split by band

Exemplar 2Strong 9Developing 31Thin 42Emerging 40Minimal 7

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	35.5	23.4	+12.1	131
Operational Transparency	25.5	14	+11.5	131
Contract Quality	30.4	19.8	+10.6	131
Access Clarity	33.7	26.5	+7.2	131
Discoverability	65.8	61.2	+4.6	131
Contract Governance	9.2	6.4	+2.8	131

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)	14%	10%	+4
MCP server (first-party)	19%	13%	+6
Agent Skills	0%	0%	0
OAuth scopes	6%	11%	-5
Security	94%	97%	-3
Arazzo workflows	3%	2%	+1
Governance rules	28%	14%	+14

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 72.5
2 Checkly 71.1
3 BrowserStack 66.1
4 UiPath 66.1
5 Tricentis 64.7
6 TempMailGrab API 62.6
7 Stack Moxie 62.4
8 Gradle 55.8
9 Treblle 55.8
10 Signadot 55

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

curl for this page

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"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

Testing

Providers using this tag (139)

APIs with this tag (129)