canonical · 0.0 capabilitymarket

Open Data

Score 36.3 / 100 556 providers +80 via APIs 578 APIs Search apis.io →

Variants seen in the corpus: Open DataOpen dataOpen-DataOpenDataopen dataopen-data

Providers using this tag (556)

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

Exemplar 4 Complete, well-documented, and agent-ready

OpenMercantilBDNSBORMEBusiness RegistryCIF3 APIs88.2 OpenSanctionsSanctions ScreeningAnti-Money LaunderingPolitically Exposed PersonsCompliance1 API74.6 Plinth US Grants DataPhilanthropyGrantsNon-ProfitFoundations1 API66.7 University of WaterlooEducationHigher EducationUniversity1 API66.5

Strong 25 Solid coverage with minor gaps

UK Power NetworksEnergyUnited KingdomUtilitiesElectricity2 APIs66.0 EPA — U.S. Environmental Protection AgencyGovernmentEnvironmentalAir Quality22 APIs65.2 La Poste GroupeCompanyLogisticsShippingPackage Tracking9 APIs64.5 Electricity North WestEnergyUnited KingdomUtilitiesElectricity2 APIs64.0 General Services AdministrationFederal-GovernmentProcurementAcquisition32 APIs62.2 BarclaysBankingCredit CardsFAPIFinance26 APIs62.0 GZW Data APIGamingVideo Gamesgray-zone-warfareGame Data1 API62.0 Consumer Data Right (Energy)EnergyAustraliaUtilitiesElectricity6 APIs60.6 Tandoor RecipesRecipesMeal PlanningFoodNutrition2 APIs60.2 University of WarwickUniversityHigher EducationEducationResearch2 APIs60.1 Northern PowergridEnergyUnited KingdomUtilitiesElectricity2 APIs60.0 We > Ultrarichwealth inequalityeconomic inequalityFinanceEconomics1 API59.9 WikidataKnowledge GraphLinked DataSemantic Web1 API59.6 University of TwenteUniversityHigher EducationEducationTechnical University1 API59.1 Ordnance SurveyReal-EstateUnited KingdomLand RegistryGeospatial10 APIs57.9 ScryfallGames And ComicsMagic The GatheringCard Data1 API57.1 Hydro-QuébecEnergyCanadaUtilitiesElectricity2 APIs56.9 University of MacauUniversityHigher EducationEducationPublic Research University1 API56.3 HM Land RegistryReal-EstateUnited KingdomLand Registry11 APIs56.2 EU Open Data PortalGovernmentSPARQLEU6 APIs55.4 Red EnergyEnergyAustraliaUtilitiesElectricity2 APIs55.0 ERCOTEnergyUnited StatesElectricityEnergy Markets1 API54.6 DietlyAPIFoodNutritionBarcodesopen-food-facts1 API54.5 data.worldData CatalogData GovernanceMetadata ManagementSPARQL1 API54.3 Endeavour EnergyEnergyAustraliaUtilitiesElectricity2 APIs54.3

Developing 126 Usable, with meaningful gaps to close

Thin 127 Limited public surface area

Emerging 186 Early or largely undocumented

Minimal 87 Almost no public developer surface

Unrated 1 Not yet scored

AMEECompanyCarbonEmissionsEnergy Data

APIs with this tag (576)

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 3 Complete, well-documented, and agent-ready

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...81.3 OpenSanctions Screening APIREST API for screening people, companies, vessels and other entities against sanctions, watchlist and PEP d...74.6 University of Waterloo Dataverse Collection (Borealis)Waterloo's named research-data collection on Borealis, the Canadian consortial Dataverse repository operate...66.5

Strong 24 Solid coverage with minor gaps

La Poste Open Data v1Gateway over La Poste's open datasets - postal codes (hexasmal), contact points, post-office opening hours,...64.5 Consumers Energy Outage Map ArcGIS REST APIConsumers Energy publishes its outage map data as an anonymous Esri ArcGIS Server 11.5 REST Services Direct...62.2 Data.gov CKAN APIThe data.gov catalog is powered by CKAN, a powerful open source data platform that includes a robust API. T...62.2 IT Collect Public APIThe IT Collect API provides a way for the general public to access government-wide IT Portfolio Management ...62.2 Remote online notarization requirements by U.S. jurisdictionStatute-cited remote online notarization requirements for all 50 U.S. states and the District of Columbia: ...61.6 Northern Powergrid Open Data Search API v1The original Opendatasoft Search API, still live on the portal and still carrying its own interactive conso...60.0 SPARQL Query ServiceThe Wikidata Query Service provides a SPARQL 1.1 endpoint at query.wikidata.org for running complex graph q...59.6 Deep Blue Data REST APIPublic REST API for Deep Blue Data, the University of Michigan Library's open repository for research datas...59.2 Second Life Live Data FeedsAnonymous, unauthenticated feeds publishing live Second Life grid statistics (grid status, total registered...59.1 University of Twente Energy APIThe university's own API, and the only contract in this profile it wrote. A public, unauthenticated REST se...59.1 AEMO NEM Data Dashboard APIThe JSON API behind AEMO's public National Electricity Market data dashboard, and the closest thing AEMO op...58.2 AEMO NEMWeb Public Data FeedNEMWeb is AEMO's open bulk-data channel for the National Electricity Market and the single largest genuinel...58.2 AEMO WA Market Data Public FeedThe Western Australian equivalent of NEMWeb, covering the Wholesale Electricity Market that AEMO operates s...58.2 Ordnance Survey Open Data APIOperations providing access to OpenData products.57.9 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 ...57.4 Hydro-Québec Open Data Search API v1The legacy Opendatasoft Search API v1 still served on the Hydro-Québec open data portal. Verified live and ...56.9 UM Data and Open Data API PlatformSixteen JSON APIs, nineteen operations, all GET, covering About UM (organizational units in Chinese, Englis...56.3 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...56.2 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...56.2 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...56.2 EU Open Data Portal Search API (hub-search)The hub-search metadata search service for data.europa.eu. Provides full-text and faceted search over ~1.9 ...55.4 EU Open Data Portal SPARQL APIThe OpenLink Virtuoso SPARQL endpoint for data.europa.eu. Every harvested dataset is stored in its own name...55.4 EU Open Data Portal Statistics APIThe hub statistics service exposes portal-wide counts over time — datasets per category, per catalogue, per...55.4 DietlyAPIREST API for food & nutrition data — search, barcode lookup, food-by-id, popular foods, categories, and hea...54.5

Developing 143 Usable, with meaningful gaps to close

Thin 129 Limited public surface area

Emerging 194 Early or largely undocumented

Minimal 82 Almost no public developer surface

Unrated 1 Not yet scored

OpenTestData APIREST API behind opentestdata.org, test.ai's free and open database of automated test fixture data. 13 paths...

Companies reaching this through an API (80)

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 Alcohol and Tobacco Tax and Trade Bureau Amber Electric AmeriCorps Arizona State University Artemis arXiv BBVA BMW Bonneville Power Administration BrightAI Bureau of Consular Affairs Bureau of Indian Affairs CenterPoint Energy Centers for Medicare and Medicaid Services Chief Financial Officers Council CMS Energy CNCF Con Edison Coutts Deakin University Department of Energy Department of State Department of the Interior DuckDuckGo ENMAX Erasmus University Rotterdam Farm Service Agency Federal Housing Finance Agency (FHFA) Federal Student Aid Hampden & Co Harvard University Indian Institute of Technology Bombay King's College London Kyushu University Linden Lab Maxar Technologies McGill University McMaster University MISO Nagoya University National Council on Disability National Credit Union Administration National Institute of Standards and Technology (NIST) Pod Point Queen's University at Kingston Refinitiv Eikon Shipping.com

Show all 80 companies ↓

SignSealShip Partner API Small Business Administration (SBA) Sorbonne University Stanford University StatsBomb (Hudl) Surge AI Technical University of Munich test.ai 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 Sheffield University of Southern California University of the Witwatersrand University of Toronto University of Waikato Université de Montréal USAID Voi Washington University in St. Louis Western University Wuhan University Zillow Group

Score breakdown

Frequency

82.7

log-scaled weighted occurrences

Breadth

15.3

spread across providers

Quality lift

31.5

mean composite of providers using it

Cohesion

36.9

strength of nearest seed neighbor

Where this tag comes from

Provider tag556

Api tag578

Openapi tag1

Openapi op tag4

Cohort brief

Auto-generated

The 551 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

551

all scored

Mean Kin Score

+4.1 vs catalog 23.9

Mean Agent Readiness

14.7

+2.7 vs catalog 12

Spread

4.2–88.2

median 27 · σ 15.8

How the 551 split by band

Exemplar 4Strong 25Developing 126Thin 127Emerging 186Minimal 83

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Discoverability	67	61.2	+5.8	551
Operational Transparency	19.3	14	+5.3	551
Contract Quality	24.8	19.8	+5	551
Contract Governance	8.6	6.4	+2.2	551
Access Clarity	28.3	26.5	+1.8	551
Developer Ergonomics	24.1	23.4	+0.7	551

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)	2%	10%	-8
MCP server (first-party)	3%	13%	-10
Agent Skills	0%	0%	0
OAuth scopes	12%	11%	+1
Security	99%	97%	+2
Arazzo workflows	2%	2%	0
Governance rules	27%	14%	+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

1 OpenMercantil 88.2
2 OpenSanctions 74.6
3 Plinth US Grants Data 66.7
4 University of Waterloo 66.5
5 UK Power Networks 66
6 EPA — U.S. Environmental Protection Agency 65.2
7 La Poste Groupe 64.5
8 Electricity North West 64
9 General Services Administration 62.2
10 Barclays 62

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/open-data"

All tags

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

As a scored cohort

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

The distribution (Pro)

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

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