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 16 Complete, well-documented, and agent-ready

Snyk REST API - Apps (OAuth)Manages Snyk Apps, the OAuth2-based extensibility surface that lets third-party applications act on behalf ...80.1 Canvas Medical FHIR APIA FHIR R4-compliant REST API providing secure access to electronic health record data including 41 FHIR res...78.4 MongoDB Atlas Data APIThe Atlas Data API lets you read and write data in MongoDB Atlas with standard HTTPS requests, without the ...75.9 Amazon API Gateway REST APIs APIOperations for creating and managing REST APIs73.2 HERE Destination Weather APICurrent conditions, forecasts, and severe weather alerts at a coordinate or destination, intended to enrich...72.2 HERE Geocoding and Search APIForward and reverse geocoding, address lookup, place discovery, browse, and details. Returns rich location ...72.2 Cvent Registration Usage and Quota APIRead the account's REST usage tier (Free / Standard / Premium) and current quota consumption before plannin...70.6 Business Central REST API Web ServicesRESTful web services layer for Business Central that provides the preferred integration method. Includes bu...69.5 Squarespace Inventory APIThe Squarespace Inventory API enables developers to retrieve and update inventory quantities for product va...69.1 Squarespace Orders APIThe Squarespace Orders API provides access to order history for a Squarespace merchant site, supporting bot...69.1 Squarespace Products APIThe Squarespace Products API allows developers to manage the product catalog of a Squarespace merchant site...69.1 Squarespace Profiles APIThe Squarespace Profiles API allows reading customer profiles, mailing list subscribers, and donors for a S...69.1 Squarespace Webhook Subscriptions APIThe Squarespace Webhook Subscriptions API allows developers to manage webhook endpoint subscriptions for a ...69.1 Red5 Agent-Native SurfacePublicly hosted llms.txt providing a structured index of Red5 products, use cases, and documentation for AI...67.5 Red5 Pro Server APIREST/JSON API embedded in the Red5 Pro media server providing server info/ping/statistics, applications, st...67.5 Stream Manager 2.0 APIREST/JSON API used by both Red5 Pro clusters and Red5 Cloud for Auth, Admin, Proxy, Streams, Streams Provis...67.5

Strong 18 Solid coverage with minor gaps

Act! Web APIJSON-based REST API for the Act! CRM database exposing contacts, companies, groups, opportunities, tasks, a...66.1 1Lookup REST APIRESTful API over HTTPS covering all 1Lookup products (phone/email/IP validation, fraud, enrichment, B2B dat...65.6 Power Platform REST APIUnified RESTful API for Power Platform administration including environment management, governance, licensi...64.6 Scale REST APIThe Scale REST API is the unified programmatic surface for Scale's data engine. It is built on REST princip...64.4 IBM API Connect Analytics APIRetrieves API event data stored in API Connect Analytics, dashboard data, and the filter parameters support...63.0 IBM API Connect Consumer Analytics APIReturns consumer-organization and per-app analytics dashboard data for application developers. OpenAPI 3.0,...63.0 IBM API Connect Discovery APIProcesses API call records collected from gateways and proxies to discover APIs that are not yet managed in...63.0 IBM API Connect Engagement APIManages engagement configuration and rules evaluated against API Connect Analytics data for a provider orga...63.0 IBM API Connect Platform - Cloud Management APICloud-scoped operations for managing the IBM API Connect cloud configuration: user registries, provider org...63.0 Amazon Web Services REST APIs APIThe REST APIs API from Amazon Web Services — 30 operation(s) for rest apis.58.6 Google Play Console APIProgrammatically manage app releases and track analytics.57.2 Fusio Worker APIThe Fusio Worker API enables executing API action logic in multiple programming languages by forwarding req...57.1 Geneos REST APIREST API plug-in56.7 Adobe Cloud Storage and Collaboration APIA REST API for managing files, folders, and projects in Adobe Creative Cloud cloud storage. The API support...56.6 Cloudflare AI Gateway Management APIThe Cloudflare API surface for managing AI Gateway resources — creating gateways, listing them, retrieving ...55.2 Cloudflare AI Gateway ProxyThe AI Gateway proxy endpoint accepts requests in each provider's native API format and forwards them throu...55.2 Prefect Server REST APIThe Prefect Server REST API is the self-hosted variant of the Prefect orchestration API for managing workfl...55.0 Recruitee Company (ATS) APIREST API for admin-side ATS operations including candidates, offers (job openings), placements, departments...54.9

Developing 22 Usable, with meaningful gaps to close

Azure Analysis Services REST APIREST API for managing Azure Analysis Services resources and performing asynchronous data refreshes of tabul...54.1 Azure SQL Managed Instance REST APIREST API for creating, configuring, and managing Azure SQL Managed Instances including databases, operation...54.1 Data API BuilderOpen source configuration-based engine that creates REST and GraphQL APIs for SQL Server, Azure SQL, Azure ...54.1 iGaming Tools MCP ServerFree public hosted MCP server (Streamable HTTP, no API key, read-only, not metered) exposing the same iGami...54.0 LSEG DataScope Select REST APIREST API providing programmatic access to the DataScope Select platform for extracting global prices, corpo...53.7 LSEG Tick History REST APIREST API providing programmatic access to historical tick-level market data through the DataScope Select pl...53.7 NetScaler ADM NITRO APIThe NetScaler Application Delivery Management (ADM) NITRO API provides programmatic access to manage, monit...53.6 NetScaler Next-Gen APINetScaler Next-Gen API is a modern declarative RESTful API built on the OpenAPI 3.0 specification that allo...53.6 NetScaler SDX NITRO APIThe NetScaler SDX NITRO API provides programmatic access to configure and manage NetScaler SDX appliances v...53.6 Razorpay Core REST APIRESTful API covering orders, payments, refunds, customers, tokens, invoices, payment links, virtual account...53.1 TweetAPI Hosted MCP ServerHosted remote HTTP MCP server providing current TweetAPI docs and read-only live public-data tools. Uses OA...50.9 TweetAPI tw-v2 REST APIREST API for public Twitter/X data with X-API-Key auth, JSON responses, and 76 documented endpoints across ...50.9 Red Hat Satellite Foreman APICore Foreman API integrated into Red Hat Satellite for host lifecycle management, provisioning, and configu...48.6 Red Hat Satellite Katello APIContent management API for Red Hat Satellite handling repositories, content views, lifecycle environments, ...48.6 Perforce P4 REST APITechnology Preview REST API introduced with P4 Server 2025.2, providing a new way to automate workflows and...48.1 Surge APISurge's REST API for managing labeling projects, tasks, and results. Endpoints cover projects (list, retrie...46.9 Windows Admin Center APIModern web-based management interface REST API for Windows Server that provides a gateway service for relay...46.4 Artifact Hub APIThe Artifact Hub REST API provides endpoints for searching and retrieving cloud-native packages across all ...43.1 Make APIThe Make REST API allows using HTTP requests to access Make data and control the Make platform without open...42.7 Anchor Browser APIThe Anchor Browser REST API exposes cloud browser sessions for AI agents. It covers session lifecycle (crea...41.3 Akamai APIsAkamai provides a comprehensive set of REST APIs for managing and configuring their platform services, incl...40.3 Tableau Server Client (Python)Python library that provides a convenient wrapper for the Tableau Server REST API for automation and integr...39.4

Thin 30 Limited public surface area

CodeSandbox Define APIThe Define API allows programmatic creation of browser sandboxes from code files, useful for documentation ...38.5 Skydio Cloud APIThe Skydio Cloud API is an HTTP-based REST API with JSON request and response bodies that lets developers m...38.1 FDC3 App Directory APIThe FDC3 App Directory (AppD) is a REST API standard for registering and discovering financial desktop appl...38.0 Parse REST APIHTTP+JSON REST API for the Parse Platform: object CRUD and queries, users and sessions, roles, files, analy...37.0 BillDesk CX+ Deep APIDirect REST API access for advanced payment processing, giving merchants full control over checkout UX. Sup...36.4 BentoML REST APIBentoML is an open-source unified inference platform for deploying and scaling AI models. It auto-generates...36.3 Prestmit Partner APIThe Prestmit Partner API allows developers to automate the buying and selling of gift cards, manage wallet ...36.0 Rubrik Cluster APIREST API exposed by on-premises Rubrik clusters (CDM) with v1, v2, and internal endpoints for managing prot...35.3 QuickBooksREST API for managing QuickBooks Online accounting entities including Customer, Vendor, Employee, Item, Inv...34.6 BentoML Service REST APIAuto-generated REST API endpoints produced when BentoML services are deployed. Each decorated service metho...33.9 MediaWiki Core REST APIModern REST surface available on Wikisource at /w/rest.php/v1/. Provides page reads (source, HTML, bare met...33.2 Wikimedia REST API v1Caching-optimised read API available at /api/rest_v1/ on each Wikisource language subdomain. Provides page ...33.2 Akka HTTPAkka HTTP is a full HTTP stack (client and server-side) built on Akka actors and streams. It provides a rou...32.4 SteadyAPIREST/JSON API providing stock market, options, crypto, real estate, sports, e-commerce, social media, trave...32.1 Kinaxis RapidResponse REST APIREST-based interface exposing the Kinaxis Maestro (RapidResponse) supply chain planning platform for data i...31.8 Port REST APIPublic REST API for the Port platform. Bearer-token authenticated (3-hour tokens minted from Port credentia...30.9 Acuity Scheduling REST API v1REST API for managing appointments, appointment types, clients, calendars, availability, intake forms, prod...30.4 Presto Client REST APIThe Presto Client REST API is the HTTP protocol used by Presto clients to submit SQL queries to a Presto co...30.2 Presto Coordinator REST APIThe Presto Coordinator REST API exposes resources for inspecting and managing a running Presto cluster, inc...30.2 HttpFS REST APIHTTP REST API gateway supporting both webhdfs and httpfs operations for HDFS access.29.3 MapReduce History Server REST APIREST API for accessing MapReduce job history and statistics.29.3 Bloomberg HTTP APIHTTP wrapper making the Bloomberg Open API available via HTTP and WebSockets, allowing clients to access re...28.9 Bloomberg Hypermedia API (HAPI)Provides programmatic access to Data License content with a combination of request-response and subscriptio...28.9 Adaptive Shield REST APIThe Adaptive Shield REST API v1 provides programmatic access to SaaS security posture data including alerts...28.0 Cortex Dependencies APIREST endpoints to list and inspect entity-to-entity dependencies (caller and callee) and the relationships ...27.7 Cortex Workflow Runs APIREST endpoints for managing and querying Workflow runs, used to drive developer self-service actions and sc...27.7 Kipu Quantum Hub APIREST API and Python SDK for the Kipu Quantum Hub — submit quantum-classical workflows, run pre-built quantu...27.7 SecureW2 REST API (MSP Organization Provisioning)REST API for Managed Service Providers to automate the lifecycle of their child organizations under an MSP ...27.3 APIs.io Engineering Platform REST APIs APIThe REST APIs API from APIs.io Engineering Platform — 30 operation(s) for rest apis.26.6 Sourcegraph REST APIVersioned external REST API introduced in Sourcegraph 7.0 and intended as the stable integration surface go...26.4

Emerging 32 Early or largely undocumented

TypeSpec HTTP LibraryThe TypeSpec HTTP library provides decorators and types for describing HTTP REST APIs including routes, ope...25.9 TypeSpec OpenAPI EmitterThe TypeSpec OpenAPI emitter converts TypeSpec definitions to OpenAPI 3.0 specifications. It supports HTTP ...25.9 TypeSpec REST LibraryThe TypeSpec REST library provides decorators for REST API patterns including resource operations (CRUD), c...25.9 Sage Accounting v3.1 REST APIREST API for Sage Business Cloud Accounting providing access to contacts, sales invoices, sales credit note...25.5 Adaptive Integration Fabric APIThe Adaptive Integration Fabric (formerly Ivory Suite) enables enterprises to rapidly expose IBM z/OS and z...24.4 what3words Public APIREST API for converting between three-word addresses and latitude / longitude coordinates, with AutoSuggest...24.2 Lenovo XClarity Administrator REST APIThe Lenovo XClarity Administrator REST API provides programmatic access to XClarity Administrator data and ...24.1 Wasabi S3 APIThe Wasabi S3 API is a 100% bit-compatible implementation of the Amazon S3 REST API for creating and managi...24.0 Jupyter ServerBackend that powers Jupyter Notebook, JupyterLab, and other Jupyter web applications. Exposes the core REST...23.7 Postalytics APIREST API for creating and sending personalized postcards and letters, managing contact lists, tracking deli...23.4 Dotmatics ELN APIOpen REST API for the Dotmatics Electronic Lab Notebook (ELN), enabling data routing to data warehouses, LI...23.0 GlobalLink Strings APIREST API (formerly Applanga) for mobile app and software string localization, supporting upload/download of...22.7 Panorama REST APIThe REST API API from Panorama — 3 operation(s) for rest api.22.5 Locize REST APIThe Locize REST API enables developers to programmatically manage translation namespaces, keys, languages, ...22.4 SessionStack REST APIThe SessionStack REST API provides programmatic access to session recordings, user events, errors, and logs...22.4 CaptionsTimestamped/segmented video transcript retrieval, up to 50 videos per call. Billed per transcript returned.20.6 JobsJob posting collection that segments by publish window/area to exceed the public 1,000-result cap. Billed p...20.6 PlacesLocal business data collection via geo point + radius sweep with deduplication on place ID; optional email ...20.6 VerifyEmail verification via syntax, disposable-domain, MX and SMTP dialogue checks (no message sent), up to 100 ...20.6 MLB Stats APIThe MLB Stats API is the modern statistics and game-data service operated by Major League Baseball. It powe...20.3 Orca Security REST APIOrca Security's REST API provides programmatic access to the Orca Cloud Security Platform for querying clou...20.3 Public APIs DirectoryA collective list of free APIs organized by category including Animals, Finance, Weather, Geocoding, Govern...18.7 Semgrep AppSec Platform REST APIOpenAPI-described REST API for the Semgrep AppSec Platform. Lists deployments, projects, findings, scans, s...17.9 Tryton REST APIRESTful API for Tryton ERP providing access to all business modules including financial accounting, stock/i...17.5 Smile CDR FHIR EndpointThe core FHIR REST API exposed by every Smile CDR FHIR Endpoint module. Supports the full FHIR REST interac...16.9 Avocode APIThe Avocode REST API provided programmatic access to projects, design files, shared screens, annotations, a...16.0 Salt Security Developer Portal APIThe Salt Security Developer Portal provides REST APIs for automating API security practices. The portal off...15.6 Wagtail API v2The Wagtail REST API v2 exposes site content — pages, images, documents, and redirects — as JSON. Endpoints...15.5 LinkPeek Website Screenshot APIREST-style HTTP GET endpoint that accepts a target web page URI and returns a screenshot image. Supports si...14.8 Metromile Enterprise APIREST API platform for property and casualty insurance carriers enabling touchless claims automation, digita...13.2 TaxNexus APIRESTful HTTPS-based API for cannabis tax compliance. Enables calculation of state, county, and local cannab...12.7 Calypso Core APIMain REST API for the Nasdaq Calypso platform. Provides programmatic access to remotely control calls to th...12.2

Minimal 3 Almost no public developer surface

FeilongFeilong is an open source z/VM cloud connector that exposes z/VM functions as REST APIs to accelerate z/VM ...10.1 ZoweZowe is an open source software framework that delivers modern interfaces to interact with z/OS, including ...10.1 Ninja Blocks REST APIHistorical RESTful API for the Ninja Blocks IoT platform, used to read device/sensor data and actuate devic...0.0

Companies reaching this through an API (74)

These companies publish an API, specification or operation carrying “REST API” 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.

Act! CRM Acuity Scheduling Adaptigent Adaptive Shield Adobe Creative Cloud Akamai API Security Akka Amazon API Gateway Amazon Web Services Anchor Browser Android Apache Hadoop APIs.io Engineering Platform Artifact Hub Avocode BillDesk Bloomberg Professional Service Calypso Canvas Medical Citrix NetScaler Cloudflare AI Gateway CodeSandbox Dotmatics FDC3 Geneos HERE IBM API Connect Jupyter Kinaxis Lenovo LinkPeek Locize Major League Baseball Make Metromile Microsoft Dynamics NAV Microsoft Power Apps Microsoft SQL Server Microsoft Windows Server MongoDB Open Mainframe Project Orca Security Panorama Port Postalytics Prefect Prestmit Presto Foundation Public APIs QuickBooks

Show all 74 companies ↓

Score breakdown

Frequency

64.0

log-scaled weighted occurrences

Breadth

2.9

spread across providers

Quality lift

41.2

mean composite of providers using it

Cohesion

5.2

strength of nearest seed neighbor

Where this tag comes from

Provider tag123

Api tag121

Openapi tag4

Openapi op tag16

Cohort brief

Auto-generated

The 122 providers in the APIs.io catalog tagged REST API, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

122

of 124 in the catalog

Mean Kin Score

even vs catalog

Mean Agent Readiness

23.5

+11.5 vs catalog 12

Spread

–

median · σ

How the 122 split by band

Exemplar 3Strong 16Developing 38Thin 38Emerging 23Minimal 4

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	38.6	17.2	+21.4	122
Developer Ergonomics	41.6	23.2	+18.4	122
Operational Transparency	30	13	+17	122
Access Clarity	34.5	23.9	+10.6	122
Discoverability	68.2	57.9	+10.3	122
Contract Governance	12.4	6.5	+5.9	122

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)	16%	13%	+3
MCP server (first-party)	13%	12%	+1
Agent Skills	0%	0%	0
OAuth scopes	16%	11%	+5
Security	99%	98%	+1
Arazzo workflows	3%	2%	+1
Governance rules	39%	16%	+23

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

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/rest-api"

All tags

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

As a scored cohort

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

The distribution (Pro)

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

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REST API

Providers using this tag (123)

APIs with this tag (121)