API Providers

Every provider tracked across the API Evangelist network, sorted A–Z.

Providers organized by the industries they operate in, from aerospace to waste management.

Providers across the top industrial countries in the world, matched by country tags.

Banks, credit unions, and building societies ranked by their Kin Score across four markets — from the CDR and Open Banking mandates to the voluntary open-finance regimes.

Card networks, acquirers, processors, PSPs, and the instant-payment rails behind each national market — the API-native layer of finance, ranked by Kin Score.

EHRs, health-data networks, payers, clinical AI, and national health infrastructure across four HL7 FHIR regimes, ranked by Kin Score.

Carriers, insurtech, embedded distribution, core policy administration, risk data, claims tech and the market bodies across four markets with no open-insurance mandate anywhere, ranked by Kin Score.

Portals, the listing-data infrastructure that federates the MLSs, brokerages, agency CRM, valuation, title and closing, property management and the land registries — the only sector with a mandated machine-readable standard, ranked by Kin Score.

Utilities and retailers, the network distributors, the system and market operators that run the grid, regulators, metering, solar and distributed energy, EV charging, storage and carbon accounting — the sector that tests whether a data mandate is replicable, ranked by Kin Score.

The GDS companies that intermediate airline inventory, the carriers, OTAs and metasearch, hotel groups and hospitality technology, corporate travel, rail, car rental, airports and the standards bodies — the sector where switching cost is the commercial structure, ranked by Kin Score.

Split by mode rather than country, because a container, a parcel and an air waybill cross borders by definition — air cargo and parcel, freight platforms, forwarders and customs, road, fleet and telematics, and ocean and ports. The sector where no single party owns the transaction, ranked by Kin Score.

A single global cohort — mobile network operators, the CPaaS aggregators that resell their connectivity, the CAMARA / GSMA Open Gateway exposure layer, standards bodies and regulators, ranked by Kin Score.

Financial market data providers ranked by their Kin Score, from terminal and feed incumbents to API-first challengers.

One architecture, three unrelated markets — headless CMS, headless and composable commerce, and the headless browser infrastructure now serving AI agents, plus the monoliths that bolted an API onto an existing platform, ranked by Kin Score.

Revenue software is the most programmable corner of go-to-market — 300 of 517 publish a machine-readable contract and 238 run their own MCP server. None describes a workflow. Seven segments, each scored and ranked, from prospecting data to the last human step before money moves.

Not one market and it does not behave like one — twenty-six points of Kin Score separate owned channels from sell-side paid media. The durable split is who the customer is: software sold to the advertiser scores 53.3, software sold to the publisher 39.0. Eleven segments, each scored and ranked.

One product in 2012, six markets now — the full-stack platforms, the gateway, ingress and service mesh data plane, developer portals and SDKs, metering and billing, API analytics and observability, and the API security vendors who left management entirely, ranked by Kin Score.

Enterprise IAM and workforce identity, the cloud platform identity services, the developer-first CIAM providers, the open source identity servers, and the authorization and policy engines — the strongest-publishing area in the catalog, where 97.5% ship a machine-readable contract, ranked by Kin Score.

The market whose entire job is making APIs legible, measured on whether its own products are — the hosted platforms you buy, the reference renderers you embed, and the docs-as-code static site generators you build with, ranked by Kin Score.

The commercial testing and quality platforms, the mocking and service-virtualization layer, load and performance testing, contract testing and test frameworks, the security scanners, and the browser and end-to-end frameworks — the first market in the series actually building for agents, ranked by Kin Score.

The client platforms that operate a hosted service, the local-first and offline-first clients that deliberately ship no cloud at all, and the command-line clients and HTTP libraries the whole industry runs on. Only three publish an API of their own — a market deliberately building without a service surface, read as a movement rather than a ranking.

Civil aviation authorities, air traffic control systems, ADS-B and flight-surveillance networks, aeronautical information and flight-data platforms, unmanned traffic management, avionics, and counter-UAS airspace security.

Model providers, agent frameworks, inference platforms, and the applied AI companies putting them to work behind an API — the industry selling agents, with a median agent-readiness of zero.

An industry that built three workflow languages and published zero workflow contracts. Biotechnology solved sequencing, orchestration and reproducibility for compute pipelines over twenty years, an…

Chains, exchanges, wallets, and the on-chain data and settlement infrastructure the digital-asset economy runs on.

Commodity, specialty and performance chemicals — the producers, the coatings and polymers makers, and the process-engineering, formulation, SDS-compliance and chemical-sourcing software sold into them.

98% of the upper band publishes a contract — the highest rate measured anywhere — and it is mostly weather APIs. The software that climate regulation created is seventeen companies.

The market everyone describes as dependent on platforms turns out to be the one best equipped to survive them.

Security and identity providers — authentication and authorization, threat detection, application and cloud security, fraud, and privacy.

Warehouses, catalogs, pipelines, and the analytics and business-intelligence layers companies expose as APIs.

The companies developers build on — SDKs and CLIs, CI/CD, containers, observability, API gateways, and the platforms that run it all.

Care delivered and coordinated through software — telehealth, EHR interoperability, patient engagement, remote monitoring, and behavioral health.

Universities, school systems, and the learning platforms, credentialing, and research infrastructure around them.

The product is deliberately closed and the supply chain is wide open. Heroic Labs scores 78.8; Take-Two scores 7.1.

The most consistently contract-publishing market measured anywhere in this research is also one of the least operable. Government did the part the policy named and stopped precisely there.

Heating, ventilation, air conditioning and refrigeration equipment, building automation and management systems, building performance and commissioning analytics, and the field-service software the contracting trade runs on.

This market proved it will adopt an API standard when one exists at the right layer. It has done that exactly once, for the narrowest problem in the stack.

This market solved interoperability where devices meet networks and left it unsolved where customers and agents meet platforms. The best contracts in the research series; the lowest MCP adoption.

Legal software and the compliance, RegTech, and risk platforms companies use to stay inside the rules.

AdTech and MarTech — campaigns, attribution, customer data, personalization, and the demand-generation stack.

The best-documented market in this research is the least agent-ready one. Mobility built excellent interfaces for a world of scheduled integrations and webhooks, and that is precisely the investmen…

Robots, drones, autonomous vehicles, and the perception and control stacks that let machines act on their own.

Chips, compute, consumer electronics, and the data-center hardware everything else is built on.

Forty years of machine-to-machine standards produced spacecraft that talk to each other across agencies and almost nothing a customer's agent can operate.

Sourcing, procurement, freight, warehousing, and the inventory and fulfillment systems that move goods — the one industry where a retried request dispatches a second truck.

What eighty-three telecom organizations worldwide actually publish, scored — the industry that built a real open standard and then published 351 specifications with no hosts in them.

The best-governed market in this research scores badly on an instrument built for agents that write. That is a finding about the instrument as much as the market.

Fortune 100, Fortune 500, and Fortune 1000 companies with APIs on the network.

The venture and growth firms funding the API economy, ranked by portfolio strength — how many of the companies they backed publish APIs that score well.

Providers whose private shares are listed on the secondary venues — Forge Global, Hiive, EquityZen, Nasdaq Private Market, and Augment — ranked by their Kin Score.

Universities and research institutions publishing APIs — course and campus data, library and repository catalogs, open research data, and scholarly collections.

United States Federal Government agencies and departments publishing APIs on the network.

European national, regional, and European Union government agencies publishing APIs on the network.

Apache Software Foundation projects publishing APIs on the network.

Cloud Native Computing Foundation projects publishing APIs on the network.