canonical · -1.0 capability

Open Data

Score 31.5 / 100 742 providers +81 via APIs 558 APIs Search apis.io →

Providers using this tag (742)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 5 Complete, well-documented, and agent-ready

OpenSanctionsSanctions ScreeningAMLPolitically Exposed PersonsCompliance1 API71.2 OpenMercantilBDNSBORMEBusiness RegistryCIF3 APIs79.4 publiqCompanyCultureEventLeisure10 APIs72.6 EnturCompanyPublic TransportJourney PlanningMobility37 APIs70.5 Plinth US Grants DataPhilanthropyGrantsNon-ProfitFoundations2 APIs68.2

Strong 36 Solid coverage with minor gaps

Open Food FactsFoodNutritionProduct Data8 APIs66.2 EPA — U.S. Environmental Protection AgencyGovernmentEnvironmentalAir Quality22 APIs58.7 Met OfficeCompanyWeatherClimateForecast12 APIs64.3 UK Power NetworksEnergyUnited KingdomUtilitiesElectricity2 APIs64.1 University of WaterlooEducationHigher EducationUniversity1 API64.0 FlyItalyADSBADS-BMLATAviationFlight Tracking1 API62.8 La Poste GroupeCompanyLogisticsShippingPackage Tracking4 APIs62.4 SirenicCompany DataBusiness RegistryKYBSanctions Screening1 API62.1 FindLocalEventHyperlocalCommunityData1 API61.1 endoflife.aiSoftwareLifecycleRisk Management1 API60.9 Electricity North WestEnergyUnited KingdomUtilitiesElectricity2 APIs60.6 Bargo Congress Trades APICongressFinanceStocksGovernment1 API59.5 Tandoor RecipesRecipesMeal PlanningFoodNutrition1 API59.5 ComplyOnSiteCompanyConstructionHealth and SafetyEnvironmental Compliance1 API59.0 Federal Aviation AdministrationTravelUnited StatesAviationAirports5 APIs59.0 BarclaysBankingCredit CardsFAPIFinance52 APIs58.6 EquinorCompanyEnergyOil and GasRenewables16 APIs58.6 Consumer Data Right (Energy)EnergyAustraliaUtilitiesElectricity6 APIs58.1 Ordnance SurveyReal EstateUnited KingdomLand RegistryGeospatial10 APIs57.7 flatin.ptReal EstateProperty TaxTaxIMI1 API57.5 General Services AdministrationFederal GovernmentProcurementAcquisition21 APIs57.4 We > Ultrarichwealth inequalityeconomic inequalityEconomicsEducation1 API57.4 Endeavour EnergyEnergyAustraliaUtilitiesElectricity2 APIs56.9 FlightFinderAviationAviation SafetyAccident Data1 API56.9 GZW Data APIGamingVideo Gamesgray-zone-warfareGame Data1 API56.9 Comunicate.euCompanyPress ReleasesAdvertorialsContent Marketing2 APIs56.6 Suomi.fiGovernmentFinlandPublic SectorDigital Identity1 API56.3 Northern PowergridEnergyUnited KingdomUtilitiesElectricity2 APIs56.1 DietlyAPIFoodNutritionBarcodesopen-food-facts1 API56.0 HORIZON SHIELDConstructionRenovationCost EstimationFair Pricing1 API55.9 Kamer van Koophandel (KVK)CompanyBusiness RegisterGovernmentNetherlands10 APIs55.7 Hydro-QuébecEnergyCanadaUtilitiesElectricity2 APIs55.4 HM Land RegistryReal EstateUnited KingdomLand Registry11 APIs55.2 EIAEnergyUnited StatesEnergy MarketsElectricity1 API54.9 Open Government, New South WalesGovernmentPublic APIsAustralia6 APIs54.9 ComparEdgeCompanySaaS PricingSoftware ComparisonAI Tools1 API54.6

Developing 102 Usable, with meaningful gaps to close

Thin 202 Limited public surface area

Emerging 164 Early or largely undocumented

Minimal 233 Almost no public developer surface

APIs with this tag (557)

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 →

Strong 25 Solid coverage with minor gaps

Remote online notarization requirements by U.S. jurisdictionStatute-cited remote online notarization requirements for all 50 U.S. states and the District of Columbia: ...65.4 Amber Electric Consumer Data Right Energy APIAmber's Consumer Data Right energy data-holder surface, mandated by the Australian CDR regime extended from...65.1 University of Waterloo Dataverse Collection (Borealis)Waterloo's named research-data collection on Borealis, the Canadian consortial Dataverse repository operate...64.0 Second Life Live Data FeedsAnonymous, unauthenticated feeds publishing live Second Life grid statistics (grid status, total registered...59.5 FAA Aeronautical Information Services Open DataArcGIS Open Data hub published by "Federal Aviation Administration - AIS" carrying 73 datasets — class airs...59.0 FAA Data Catalog API (CKAN)The FAA's public data clearinghouse at catalog.data.faa.gov runs CKAN 2.11.4 and exposes the standard CKAN ...59.0 FAA NAS Status Airport Status Information FeedUnauthenticated XML feed of national airspace system status — ground stop programs, ground delay programs, ...59.0 FAA NMS North Atlantic Track NOTAM FeedUnauthenticated JSON feed of North Atlantic Track NOTAMs published by the FAA NOTAM Management Service. Eac...59.0 FAA NMS System Metrics FeedUnauthenticated JSON feed backing the NOTAM Management Service system metrics dashboard — cumulative NOTAMs...59.0 FAA Temporary Flight Restriction (TFR) List APIUnauthenticated JSON list of active Temporary Flight Restrictions, each carrying a NOTAM id, TFR type, ARTC...59.0 FAA UAS Data Delivery System Open DataArcGIS Open Data hub for unmanned aircraft data — UAS Facility Maps (the LAANC altitude grid), national sec...59.0 Ordnance Survey Open Data APIOperations providing access to OpenData products.57.7 Consumers Energy Outage Map ArcGIS REST APIConsumers Energy publishes its outage map data as an anonymous Esri ArcGIS Server 11.5 REST Services Direct...56.9 Northern Powergrid Open Data Search API v1The original Opendatasoft Search API, still live on the portal and still carrying its own interactive conso...56.1 JIDEC Verification Ledger APIAppend-only, Bitcoin-anchored (OpenTimestamps) public ledger of the verification process at https://ledger....55.9 Hydro-Québec Open Data Search API v1The legacy Opendatasoft Search API v1 still served on the Hydro-Québec open data portal. Verified live and ...55.4 HM Land Registry Open Data SPARQL APILive SPARQL 1.1 query endpoint over HM Land Registry's open linked data — Price Paid Data transaction recor...55.2 HM Land Registry Price Paid Data Linked Data APIW3C Linked Data API over the Price Paid Data dataset, exposing every property sale in England and Wales sol...55.2 UK House Price Index Linked Data APIW3C Linked Data API over the UK House Price Index, the official house price statistic calculated by the Off...55.2 CivicData Open Data API (CKAN) — END OF LIFECivicData.com is Accela's free open-data platform for government agencies, described on its own site as "a ...54.9 EIA Bulk Download FacilityEIA's bulk data distribution surface, served from the same api.eia.gov host as APIv2 but requiring no API k...54.9 AEMO NEM Data Dashboard APIThe JSON API behind AEMO's public National Electricity Market data dashboard, and the closest thing AEMO op...54.8 AEMO NEMWeb Public Data FeedNEMWeb is AEMO's open bulk-data channel for the National Electricity Market and the single largest genuinel...54.8 AEMO WA Market Data Public FeedThe Western Australian equivalent of NEMWeb, covering the Wholesale Electricity Market that AEMO operates s...54.8 SYNTHORA Live World Map APIPublic, credential-free JSON behind the mundo.hergertsynthora.com 3D globe: GET /mapstate returns the live ...54.5

Developing 72 Usable, with meaningful gaps to close

Con Edison Hosting Capacity Map REST APICon Edison's distribution-grid open data, published as anonymously readable Esri ArcGIS REST feature servic...53.4 SPARQL Query ServiceThe Wikidata Query Service provides a SPARQL 1.1 endpoint at query.wikidata.org for running complex graph q...53.4 PermID Entity Search APIRESTful API for searching and discovering organizations, equity instruments, and equity quotes using PermID...53.3 PermID Record Matching APIRESTful API for matching unstructured entity records to PermID identifiers. Enables concordance by mapping ...53.3 EU Open Data Portal SPARQL APIThe OpenLink Virtuoso SPARQL endpoint for data.europa.eu. Every harvested dataset is stored in its own name...53.1 EU Open Data Portal Statistics APIThe hub statistics service exposes portal-wide counts over time — datasets per category, per catalogue, per...53.1 Lyft Micromobility GBFS FeedsLive General Bikeshare Feed Specification (GBFS) feeds for the eight bikeshare and scooter systems Lyft ope...52.3 Bureau of Transportation Statistics Open Data APIThe Bureau of Transportation Statistics open data platform on Socrata SODA 2.1, and the authoritative recor...51.7 DOT Data Hub Open Data APIThe departmental open data platform, served from both data.transportation.gov and datahub.transportation.go...51.7 DOT Open Data PortalThe U.S. Department of Transportation Open Data Portal provides access to transportation datasets published...51.7 FAA Data Catalog (CKAN Action API v3)The Federal Aviation Administration's open data catalog, running CKAN 2.11.4 and exposing the full CKAN Act...51.7 NHTSA Safety API (recalls, complaints, safety ratings)The NHTSA public safety API that powers the dynamic search applications on nhtsa.gov. Three families: /reca...51.7 NHTSA vPIC (Vehicle Product Information Catalog) APIThe National Highway Traffic Safety Administration's Vehicle Product Information Catalog and VIN decoder, a...51.7 Craft Quantities Static Data APIFree static JSON files (CC BY 4.0, no key) describing every calculator input, bound, unit and test vector, ...51.0 MISO Market ReportsMISO's long-running bulk market report surface — the second fully anonymous layer of its open market data, ...50.4 SSEN Distribution Data Portal APIThe public CKAN 2.10.10 Action API behind the SSEN Distribution Data Portal, serving 45 open datasets cover...49.8 SSEN Power Track Real Time Outage APIAnonymous JSON API behind the SSEN Power Track map, returning planned and unplanned outages on the SSEN Dis...49.8 Digitraffic Rail GraphQL APIGraphQL interface to Finnish rail traffic data (trains, locations, compositions, stations, passenger inform...49.7 HY Data Catalogue DSpace REST APIA SECOND, separate DSpace deployment — datakatalogi.helsinki.fi, running DSpace 9.0 with dspaceName "HyData...48.6 HY Data Catalogue OAI-PMH InterfaceOAI-PMH 2.0 endpoint for the HY Data Catalogue. Identify returns repositoryName "HyDatacatalogue", adminEma...48.6 IESO Public Reports RepositoryThe IESO's open market and system data surface. A flat HTTPS file repository publishing 139 report director...47.5 Open Data API (XML Services)SOAP/XML open data services of the e-Business Register (X-Road producer namespace arireg.x-road.eu), delive...47.2 PokéAPI GraphQL API (Beta)The PokéAPI GraphQL beta exposes the same Pokémon dataset as the REST API through a single endpoint with fi...47.2 DOJ Open Data CatalogDOJ publishes datasets through the Open Government program and the Department's Data Inventory. Datasets ar...46.5 CMS Socrata Open Data API (data.cms.gov)data.cms.gov hosts hundreds of CMS datasets including Medicare Fee-for-Service utilization and payment data...46.1 ExploreCourses course-data XML query interfaceThe Registrar's course catalog, queryable as XML by appending view=xml-20140630 to a search. Open, no crede...45.8 UBC Library Abacus Dataverse APIThe REST API of Abacus, UBC Library's research-data repository, running Dataverse 5.9 on UBC's own infrastr...45.8 OpenStreetMap Overpass APIThe Overpass API is a read-only database engine for complex geospatial queries against the OSM dataset. Acc...45.5 UvA Archives Collection Descriptions OAI-PMH (ArchivesSpace tenancy)OAI-PMH provider exposing EAD collection descriptions and inventories from the University of Amsterdam Libr...45.2 UvA Central Catalogue OAI-PMH (Ex Libris Alma tenancy)The harvesting endpoint the university library documents for its central catalogue — roughly 2.5 million bi...45.2 UvA Library Linked Open Data (TriplyDB tenancy)The University of Amsterdam Library publishes its digitised collections — books, letters, maps, images, aud...45.2 UvA/HvA Research Data Repository (Figshare tenancy)The shared research data repository of the University of Amsterdam and the Amsterdam University of Applied ...45.2 OSFI Banks Financial DataPublicly disclosable regulatory returns filed by federally regulated banks — M4 Consolidated Balance Sheet,...44.8 OSFI Foreign Bank Branches Financial DataPublicly disclosable regulatory returns filed by foreign bank branches operating in Canada — M4 Consolidate...44.8 OSFI Fraternal Benefit Societies Financial DataPublicly disclosable regulatory returns filed by federally regulated fraternal benefit societies — the LICA...44.8 OSFI Life Insurance Companies Financial DataPublicly disclosable regulatory returns filed by federally regulated life insurance companies — LCA/LCQ (LI...44.8 OSFI Loan Companies Financial DataPublicly disclosable regulatory returns filed by federally regulated loan companies — M4 Consolidated Balan...44.8 OSFI Property and Casualty Companies Financial DataPublicly disclosable regulatory returns filed by federally regulated property and casualty insurers and mor...44.8 OSFI Retail Associations Financial DataPublicly disclosable regulatory returns filed by federally regulated cooperative retail associations — M4 C...44.8 OSFI Trust Companies Financial DataPublicly disclosable regulatory returns filed by federally regulated trust companies — M4 Consolidated Bala...44.8 OSFI Who We Regulate RegisterPublic register of the federally regulated financial institutions OSFI supervises, including every federall...44.8 University of Twente Energy APIThe university's own API, and the only contract in this profile it wrote. A public, unauthenticated REST se...44.6 arXiv Bulk DataFull-text and source bulk distribution channels: an Amazon S3 Requester-Pays bucket containing every arXiv ...44.3 Dibblee Catalogue and FLIS JSON IndexesStatic machine-readable JSON indexes published on dibind.com and listed in its llms.txt: catalogue product ...44.2 Carbon Intensity APIThe official Carbon Intensity API for Great Britain, developed by NESO, giving national and regional carbon...43.5 bonndata OAI-PMH Metadata EndpointOAI-PMH 2.0 metadata-harvesting endpoint for bonndata, the University of Bonn institutional research data r...43.4 AESO Energy Trading System (ETS) Public ReportsAESO's long-running Energy Trading System report servlets — the fully anonymous half of its data posture, a...43.3 Deep Blue Data REST APIPublic REST API for Deep Blue Data, the University of Michigan Library's open repository for research datas...43.2 Course Explorer (CISAPI)The Course Information Suite API — RESTful resources over Class Schedule and Course Catalog data, organised...42.5 IDEALS OAI-PMHThe OAI-PMH 2.0 data provider for IDEALS, the Illinois Digital Environment for Access to Learning and Schol...42.5 Illinois Data Bank Dataset MetadataThe campus research data repository, built and run in-house by the University Library (github.com/medusa-pr...42.5 SP Energy Networks Open Data Search API (v1.0)The legacy Opendatasoft Search API v1.0 still served alongside Explore v2.1 on the SP Energy Networks Open ...42.5 Surge Toxicity DatasetThe world's largest open social-media toxicity dataset, published under MIT license.41.9 KU Leuven Research Infrastructure (Onderzoeksinfrastructuur) APIICTS Data Services index of core facilities and shared research equipment, 379 records live on 2026-08-19. ...41.5 KU Leuven Research Projects (Onderzoeksprojecten) APIICTS Data Services index over the KU Leuven research database, the richest surface in the estate. Beyond fr...41.5 KU Leuven Research Teams (Onderzoeksteams) APIICTS Data Services index of research groups, 740 records live on 2026-08-19, joined to projects and to the ...41.5 UCLA DataverseUCLA's research data repository, running open-source Dataverse on a UCLA-owned host under a UCLA-issued cer...41.3 BTS Open Data SODA APIThe BTS Open Data portal powered by Socrata provides programmatic access to transportation datasets via the...41.1 Dane Badawcze UW OAI-PMH EndpointOAI-PMH 2.0 metadata harvesting endpoint for the University of Warsaw Research Data Repository (Dataverse)....41.0 Dane Badawcze UW Research Data Repository REST APIThe University of Warsaw Research Data Repository (Dane Badawcze UW) is a Dataverse-based institutional rep...41.0 RepOD — Repository for Open Data (ICM UW)RepOD is Poland's general-purpose repository for open research data, running the same Dataverse build (1.3....41.0 Zillow Neighborhood DataAggregate neighborhood-level housing statistics from Zillow, listed on the Zillow Group developer portal bu...40.5 Zillow Real Estate MetricsZillow housing market metrics - median home values, rents and inventory - published from the national level...40.5 AmeriCorps Open Data SODA APIThe AmeriCorps Open Data portal provides programmatic access to AmeriCorps research, evaluation, and progra...40.2 Quality of Government (QoG) Open DataThe Quality of Government Institute at the University of Gothenburg publishes open-access governance datase...40.2 EUR Data Repository (DataverseNL tenancy)EUR's institutional research DATA repository, distinct from the RePub publication repository. This entry re...40.0 Hampden & Co Open Data APIPublic, unauthenticated Open Data reference API conforming to the OBIE UK Open Banking Open Data standard (...40.0 DataBC Public OGC Web Services (WMS/WFS)DataBC's public OGC endpoint serves the spatial half of the BC Data Catalogue: 895 queryable WMS 1.3.0 laye...39.8 DataSpace@HKUST Research Data Repository APIThe institutional research data repository, running Dataverse 6.1 on Payara. HKUST self-hosts it: dataspace...39.7 HKUST Open Data PlatformCentral Elastic Stack repository established by ITSO to collect, search and visualise smart-campus data, in...39.7 Meteorology Department Climate Data ServicesThe Department of Meteorology's data server, metdata.reading.ac.uk, which publishes observations from the U...39.6 DuckDuckGo Tracker Radar DatasetTracker Radar is the open dataset that powers DuckDuckGo's tracker and fingerprinting protection. It is a J...39.4

Thin 124 Limited public surface area

Emerging 139 Early or largely undocumented

Minimal 197 Almost no public developer surface

Companies reaching this through an API (81)

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

Accela AEMO AESO Air France-KLM Alcohol and Tobacco Tax and Trade Bureau Amber Electric AmeriCorps Arizona State University arXiv BBVA BMW BrightAI Bureau of Consular Affairs Bureau of Indian Affairs CenterPoint Energy Chief Financial Officers Council Citeerbaar CMS Energy CNCF Comontel Compera Con Edison contractors.fyi Coutts Deakin University Department of Energy Department of Interior Department of State Dibblee Industries DuckDuckGo ENMAX Erasmus University Rotterdam Farm Service Agency Federal Housing Finance Agency (FHFA) Federal Student Aid Hampden & Co Harvard University Hergert Synthora King's College London Kyushu University Linden Lab Lyft McGill University McMaster University MISO Nagoya University National Council on Disability National Institute of Standards and Technology (NIST) Pod Point Queen's University at Kingston

Show all 81 companies ↓

Refinitiv Eikon Shipping.com SignSealShip Partner API Small Business Administration (SBA) Sorbonne University Stanford University StatsBomb (Hudl) Surge AI Technical University of Munich UCL UK Open Banking University of Barcelona University of Birmingham University of California, Los Angeles University of Chile University of Florida University of Manchester University of Michigan-Ann Arbor University of Reading University of Southern California University of the Witwatersrand University of Toronto University of Waikato Université de Montréal USAID Vantor Voi Washington University in St. Louis Western University Wuhan University Zillow Group

Score breakdown

Frequency

78.4

log-scaled weighted occurrences

Breadth

9.6

spread across providers

Quality lift

24.9

mean composite of providers using it

Cohesion

29.9

strength of nearest seed neighbor

Where this tag sits

742 providers carry this tag directly, and 789 counting the 2 narrower tags below and the 3 beneath them — 47 more to reach.

Data Catalog 219 providers Government Data 213 providers

Where this tag comes from

Provider tag742

Api tag558

Openapi tag3

Openapi op tag14

Markets provisional

Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.

Market	Share of the market's providers
Open Data Portals (CKAN / DCAT)	95%
Government and Open Data	62%
IIIF and Cultural Heritage (GLAM image interoperability, Linked Art)	32%
Higher Education and Research	31%
US Federal API Programs (api.data.gov, Login.gov, GSA MAS, FedRAMP)	29%

Cohort brief

Auto-generated

The 707 providers in the APIs.io catalog tagged Open Data, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

707

of 742 in the catalog

Mean Kin Score

24.9

+0.8 vs catalog 24.1

Mean Agent Readiness

15.6

+1.5 vs catalog 14.1

Spread

1.6–79.4

median 24.2 · σ 16.2

How the 707 split by band

Exemplar 5Strong 34Developing 94Thin 196Emerging 157Minimal 221

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	25.4	18.6	+6.8	707
Discoverability	65.2	59.1	+6.1	707
Contract Governance	11.9	9.7	+2.2	707
Developer Ergonomics	25.5	24.5	+1	707
Operational Transparency	14	13.2	+0.8	707
Access Clarity	19.5	30	-10.5	707

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)	13%	18%	-5
MCP server (first-party)	13%	16%	-3
Agent Skills	0%	0%	0
OAuth scopes	12%	13%	-1
Security	100%	99%	+1
Arazzo workflows	2%	1%	+1
Governance rules	49%	36%	+13

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

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This tag

curl "https://apis.io/api/v1/tags/open-data"

All tags

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

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