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 7 Complete, well-documented, and agent-ready

Stripe Test Helpers APIStripe provides a number of resources for testing your integration. Make sure to test the following use cas...83.2 Ada MCP ServerModel Context Protocol server exposing Ada's management surface to AI assistants — metrics, conversation tr...75.7 Dynatrace Synthetic API v2The Dynatrace Synthetic API v2 provides programmatic access to synthetic monitoring resources including bro...71.8 Adobe Target APIManage personalization activities, audiences, offers, and deliver experiences across web, mobile, and IoT c...71.2 New Relic Synthetics APIThe New Relic Synthetics API, available through NerdGraph, allows you to programmatically create, update, d...68.8 Plaid Sandbox APIPlaid's Sandbox is part of the Plaid open-finance platform, exposing 23 documented endpoint(s) under the Pl...68.2 Google Search Console URL Testing Tools APIProvides tools for running validation tests against single URLs, including mobile-friendly testing and rich...67.1

Strong 12 Solid coverage with minor gaps

PostmanPostman is the single platform for collaborative API development used by 35+ million developers. It covers ...64.5 Postman Monitors APIThe Monitors API runs Postman Collections on a recurring schedule to validate API health, performance, and ...64.5 Singular Testing Console APIBETA integration-testing API. Register a real test device to open a one-hour logging session, then read bac...64.4 OpenAI Evals APIManage and run evals in the OpenAI platform.64.2 Dwolla Sandbox Simulations APISandbox-only endpoint that advances the state of test transfers and other resources so developers can simul...62.6 Bolt APIThe core Bolt merchant API. Covers Bolt shopper accounts (profile, addresses, payment methods), merchant co...62.2 Bolt Embeddable Checkout v1 APIThe Embeddable Checkout v1 API used by merchants building their own checkout UI on top of Bolt. Exposes sho...62.2 Bolt Embeddable Checkout v3 APIThe v3 generation of the Bolt Embeddable Checkout API, served under a /v3 path with a templated environment...62.2 Stack Moxie REST APIThe hosted Stack Moxie REST API. Create, read, update and delete test Scenarios; run them synchronously or ...60.8 Datadog Synthetics APIThe Synthetics API allows you to manage API tests and browser tests programmatically. Datadog Synthetics us...57.1 Conviva Validation Timeline API v2Session validation timeline data for QA and sensor-integration testing, queried by viewer_id and/or session...56.3 Treblle Aspen API TestingAspen is Treblle's intelligent API testing application for macOS featuring AI-powered capabilities through ...55.1

Developing 35 Usable, with meaningful gaps to close

Genability Signal Echo APITesting and debugging endpoints that validate credentials, echo a hello response, simulate error codes and ...52.7 Dojo EPOS Tester Tool APIA small helper API for the Dojo EPOS Tester tool, used to validate an EPOS integration against Dojo's EPOS ...52.1 TestFairy REST APIREST API for managing TestFairy projects, builds, testers, tester groups, sites, webhooks, permissions, fee...52.1 Salesforce Automation Testing APIApex test execution51.6 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...51.2 Speakeasy Contract TestingAPI contract test generation using OpenAPI specs and the Arazzo specification. Generates both test code and...51.0 Defacto Testing APIThe Testing API from Defacto — 5 operation(s) for testing.50.9 Azure DevOps Test Plans APIThe Azure DevOps Test Plans API provides REST endpoints for managing test plans, test suites, test cases, a...50.0 Bond Simulation (Sandbox) APISandbox-only endpoints for deterministically testing banking flows before going live — simulate a card tran...49.4 Chef InSpecInSpec is an open-source language and runner for security and compliance testing. It is consumed via the In...48.1 BrowserStack Accessibility Testing APIThe BrowserStack Accessibility Testing API provides REST access to workflow analyzer, assisted tests, websi...47.6 BrowserStack App Accessibility Testing APIThe BrowserStack App Accessibility REST API enables programmatic access to accessibility data for mobile ap...47.6 BrowserStack Automate APIThe BrowserStack Automate REST API provides access to plan, project, build, and session details for Seleniu...47.6 BrowserStack JavaScript Testing APIThe BrowserStack JavaScript Testing API provides HTTPS-based access to run JavaScript unit tests across 300...47.6 BrowserStack Low Code Automation APIThe BrowserStack Low Code Automation REST API enables triggering test suite executions and retrieving build...47.6 BrowserStack Test Management APIThe BrowserStack Test Management API provides REST access to manage test projects, folders, test cases, tes...47.6 BrowserStack Test Reporting and Analytics APIThe BrowserStack Test Reporting and Analytics API provides programmatic access to upload JUnit XML and Allu...47.6 Panaya APIPanaya's REST API surface, including the Test Dynamix APIs (Transaction, Cycles, Folder, Business Process, ...47.5 Amazon B2B Data Interchange Testing APITest and validate mappings, parsing, and conversions47.3 Bolt Testing APIUse the Testing API to generate and retrieve test data to verify a subset of flows in non-production enviro...45.5 DCC Boxed DUIS Signing Tool APIAn open-source HTTP API published by Smart DCC Limited for signing and validating DUIS (DCC User Interface ...45.3 Ciena Emulation Cloud APICiena Emulation Cloud is an open application development environment enabling developers to create, test, a...43.6 Trellix API ExplorerInteractive API documentation and testing tool for Trellix security products formerly under the FireEye bra...43.5 Ankorstore Testing APIℹ️ This section is dedicated to the testing API during development process. The listed endpoints are **not ...42.8 Newline Sandbox APISimulation endpoints for the Newline sandbox environment that let developers mock transactions and transfer...42.5 handy Testing APIThe Testing API from handy — 1 operation(s) for testing.42.3 Chrome DevTools ProtocolInstrument, inspect, debug and profile Chromium, Chrome and other Blink-based browsers.41.4 Testsigma REST APIREST API to manage Testsigma entities (projects, applications, environments, elements, uploads, test plans)...41.2 Cloud Testing APIThe Cloud Testing API powers Firebase Test Lab, enabling developers to test Android and iOS apps on real an...41.1 Launchable APIThe Launchable (CloudBees Smart Tests) service API that the Launchable CLI calls to record builds, create t...40.6 Scalar API ClientScalar API Client is a fully open-source, offline-first REST API client built on the OpenAPI standard. Supp...40.3 InsomniaInsomnia is an open-source, cross-platform API development platform by Kong for designing, debugging, and t...40.0 Juniper JSNAPyPython-based tool for snapshot and verification of network device configurations.39.6 AmbassadorAmbassador offers a suite of products designed to deliver API developer experiences that fuel innovation. T...39.3 Ambassador Blackbird API Development PlatformBlackbird is an API development platform that helps developers design, build, test, and manage APIs with AI...39.3

Thin 33 Limited public surface area

Kalshi Trade API (Demo)Demo / sandbox environment for the Kalshi Trade API - mirrors production semantics with simulated balances ...39.1 Redocly Respect MonitoringRespect Monitoring is Redocly's continuous, API-aware monitoring product powered by OpenAPI Arazzo workflow...38.9 Cypress Cloud Data Extract APIEnterprise reporting API that returns test and run analytics and raw test-result data from Cypress Cloud. R...38.4 JSNAPy APIPython-based snapshot and test framework for Junos devices.37.1 Thumbtack Testing APIThe Testing API from Thumbtack — 1 operation(s) for testing.36.1 Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...35.8 Mock Bank APIThe Mock Bank API provides a sandbox environment for testing and developing banking integrations without co...35.5 Codecov APIREST API for Codecov code coverage reporting service, enabling programmatic access to coverage reports, bra...35.1 Coveralls APIREST API for Coveralls code coverage history and statistics service, tracking test coverage over time and i...35.1 Katalon TestOps APIAPI for Katalon TestOps test automation platform, providing endpoints for test case management, test execut...35.1 PractiTest APIREST API for PractiTest test management platform supporting test case libraries, test runs, requirements, d...35.1 SonarQube APIREST API for SonarQube code quality and security analysis platform, supporting test coverage metrics, code ...35.1 TestRail APIREST API for TestRail test case management system, enabling programmatic creation, update, and retrieval of...35.1 Zephyr Scale APIREST API for Zephyr Scale test management in Jira Cloud, supporting test case creation, test cycles, test e...35.1 Promptfoo CLIThe Promptfoo CLI is the primary entry point for running prompt and model evaluations from the command line...34.6 pytestpytest is the Python testing framework supporting test suite organization through test classes, directories...34.2 Tenderly Virtual TestNets REST APIProvision and manage production-mirroring virtual blockchain environments with state sync, unlimited faucet...32.9 Spring WebFlux TestingTesting support for WebFlux applications including WebTestClient for integration testing of server endpoint...32.4 Beeceptor APIBeeceptor's management API provides programmatic access to create and manage mock endpoints, rules, and tra...32.3 NucleiNuclei is an open source vulnerability scanner from ProjectDiscovery that uses YAML-based templates to find...32.0 Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...31.0 ChecklyCheckly is a monitoring-as-code platform for API and synthetic monitoring with Playwright-based browser che...30.7 Glama MCP InspectorBrowser-based MCP debugger that spins up an ephemeral sandbox from a server URL. Lets developers exercise t...30.3 K6k6 is an open source load testing tool by Grafana Labs for testing the performance and reliability of APIs ...29.6 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 Pact Broker APIPact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact con...28.3 Xfers Testing APIAPI for testing purposes28.2 Greenhouse Assessment APIThe Assessment Partner API enables assessment platforms (code testing, video interviewing, personality test...28.0 Scalar API ClientFully open-source, offline-first API client built on the OpenAPI standard - a Postman/Insomnia alternative ...27.2 Cucumber APIREST API and tooling for Cucumber BDD framework supporting test-first development with Gherkin feature file...26.6 TestRail APIREST API for TestRail test management including test plans, test runs, milestones, and reporting, enabling ...26.6 Deluxe Payments Platform — Sandbox API (Deluxe-published OpenAPI)The only OpenAPI document Deluxe publishes itself — an OpenAPI 3.0.0 definition titled "Deluxe Postman-Sand...26.4

Emerging 43 Early or largely undocumented

TUF Conformance Test SuiteThe official TUF client conformance test suite for verifying that TUF client implementations correctly impl...26.0 Wove Testing APITest endpoints for API validation25.6 Cucumber JVMJava/JVM implementation of Cucumber supporting Java, Kotlin, Scala, and other JVM languages. Distributed vi...25.5 Cucumber RubyRuby implementation of Cucumber, the original Cucumber project. Distributed as the cucumber gem on RubyGems.25.5 Cucumber.jsJavaScript/Node.js implementation of Cucumber for running BDD tests in Node and the browser. Distributed as...25.5 Build and Test APIsAPIs for build automation, test frameworks, code coverage tools, and quality gates that verify software cor...25.0 XRPL JSON-RPC API (Testnet)JSON-RPC interface to the XRP Ledger Altnet testnet for development and testing. Supports the same method s...24.8 XRPL WebSocket API (Testnet)WebSocket interface to the XRP Ledger Altnet testnet for development and testing. Supports real-time subscr...24.8 Testing and Quality Assurance APIsAPIs for automated testing frameworks and quality assurance platforms that support unit testing, integratio...24.0 REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...23.3 Selenium GridSelenium Grid allows you to run test cases in different machines across different platforms. It enables the...23.2 Selenium WebDriverWebDriver is a browser automation framework that accepts commands and sends them to a browser. It is implem...23.2 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 RISC-V Spike ISA SimulatorSpike is the official RISC-V ISA Simulator and the golden reference implementation for RISC-V. It simulates...21.5 Azure Playwright Testing Service APIAzure Playwright Testing is a managed cloud service for running Playwright tests at scale. It provides brow...20.3 Playwright APIPlaywright provides a cross-browser automation API for end-to-end testing of web applications. It supports ...20.3 SuperTestSuperTest is a Node.js library for testing HTTP servers by providing a high-level abstraction for HTTP asse...20.3 CIP TestingThe CIP Testing working group runs continuous-integration and hardware-in-the-loop testing on member-suppli...20.0 Vegeta Load Testing ToolVegeta is an open source HTTP load testing tool and library written in Go for generating constant request r...18.7 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 NamekoNameko is a microservices framework for Python that provides tools for building, testing, and running servi...17.6 JUnit 4 VintageThe legacy version of JUnit still widely used in Java projects.17.3 JUnit 5 JupiterThe next generation of JUnit for Java 8 and beyond, providing an expressive API for writing tests and exten...17.3 Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...17.2 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 Mockito CoreThe core Mockito mocking framework for creating mock objects, stubbing methods, verifying invocations, and ...16.3 Apache JMeterApache JMeter is a load testing and performance measurement tool for web applications, databases, FTP serve...15.8 BehaveBehave is a Python BDD framework inspired by Cucumber that enables teams to write behavior specifications i...15.4 CucumberCucumber is the world's most popular BDD framework, supporting Java, JavaScript, Ruby, Python, and C#. It u...15.4 JBehaveJBehave is a pioneering BDD framework for Java and JVM languages. It supports web, REST API, and microservi...15.4 SpecFlowSpecFlow is a BDD framework for .NET developers, enabling teams to write behavior specifications in Gherkin...15.4 Cequence API Security TestingAPI Security Testing extends Cequence into shift-left, performing pre-production OpenAPI conformance and vu...14.7 Jest Core APICore testing framework API for writing and running tests, including globals, expect assertions, mock functi...13.9 NUnit Framework APIThe core NUnit testing framework programming API for writing and executing unit tests in .NET applications....13.9 GatlingGatling is an open source load and performance testing framework for web applications and APIs with a Scala...13.7 Gatling Enterprise Public APIThe Gatling Enterprise Edition public API enables you to trigger runs or fetch run results and metrics, inc...13.7 JMock Core APICore library for creating mock objects and defining expectations in Java tests using an expressive DSL. Sup...12.5 KarateKarate is an open source API test automation framework combining API testing, mocks, and performance testin...12.0 NewmanNewman is the open source command-line companion for Postman that runs Postman collections from the CLI for...11.9 PortmanPortman is an open source CLI tool that auto-generates Postman collections with contract and variation test...11.8

Minimal 4 Almost no public developer surface

COBOL CheckCOBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code w...10.9 Mirage JSMirage JS is a JavaScript library for mocking APIs. It enables frontend developers to build complete featur...10.8 Nordson Corporation APIThe Nordson Corporation API provides access to platform services and data for enterprise integration and au...9.3 PrismPrism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock response...9.1

Score breakdown

Frequency

66.7

log-scaled weighted occurrences

Breadth

5.3

spread across providers

Quality lift

40.4

mean composite of providers using it

Cohesion

12.5

strength of nearest seed neighbor

Where this tag comes from

Provider tag135

Api tag131

Openapi tag11

Openapi op tag35

Cohort brief

Auto-generated

The 192 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

192

all scored

Mean Kin Score

33.3

+12.6 vs catalog 20.7

Mean Agent Readiness

17.5

+7.8 vs catalog 9.7

Spread

0.9–83.2

median 32.7 · σ 16.9

How the 192 split by band

Exemplar 7Strong 15Developing 48Thin 54Emerging 51Minimal 17

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	34.5	17.5	+17	192
Developer Ergonomics	32.3	17.9	+14.4	192
Operational Transparency	24.8	11.3	+13.5	192
Access Clarity	33	22.3	+10.7	192
Discoverability	67.8	60.4	+7.4	192
Contract Governance	12.3	6.4	+5.9	192

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)	27%	16%	+11
MCP server (first-party)	11%	7%	+4
Agent Skills	0%	0%	0
OAuth scopes	12%	9%	+3
Security	92%	88%	+4
Arazzo workflows	6%	2%	+4
Governance rules	37%	13%	+24

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 Stripe 83.2
2 Ada 75.7
3 Dynatrace 71.8
4 Adobe Suite 71.2
5 New Relic 68.8
6 Plaid 68.2
7 Google Search Console 67.1
8 Postman 64.5
9 Singular 64.4
10 OpenAI 64.2

Work with this as data

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

MCP server

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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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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 (192)

APIs with this tag (134)