Wild APIs
1,609 listings19 categoriesVerified weeklySubmit an API

Data & Knowledge APIs

Reference data, public records and research metadata share this category. Wikipedia & Reference covers Wikipedia and Wikidata, both free with no key; Open Government Data gathers national and city portals from the US to Brazil and Poland; Academic adds scholarly indexes such as OpenAlex and arXiv; and Economic Data brings central-bank and statistics series like FRED and the World Bank. Dictionaries, Books, Census & Demographics and Education round it out.
182 listings of 186 in catalogue
TableRows
APIPricingAuthFormatFree tierStatus
AcreLensScores US land parcels for off-grid, rural or investment suitability using solar, water and flood data.
Data & Knowledge › Datasets
PaidAPI keyJSON—Live
Agify.ioPredicts a likely age for a first name from statistics on roughly a billion people.
Data & Knowledge › Census & Demographics
FreemiumAPI keyJSON<100/dayDegraded
API ColombiaColombia reference data: departments, cities, tourist sites, airports, presidents and more.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
API.BibleBible text API covering many translations and languages, with book, chapter, verse and search endpoints.
Data & Knowledge › Books
FreemiumAPI keyJSON100–1k/dayLive
api.data.govOne free key unlocks 450+ US federal agency APIs (NASA, NOAA, FDA, and more).
Data & Knowledge › Open Government Data
FreeAPI keyJSON10k+/dayDegraded
ApiverketSingle API for 35+ Swedish agencies: weather, statistics, transport, companies, parliament and more.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON100–1k/dayLive
ArgentinaDatosArgentine holidays, inflation, interest rates, and Congress voting data from public sources.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
arXivSearches and retrieves metadata for millions of physics, math, CS and related research preprints.
Data & Knowledge › Academic
FreeNoneXML—Live
Ayes and NoesUK MPs, parties, Commons voting records and Early Day Motions, built on official Parliament data.
Data & Knowledge › Open Government Data
FreeAPI keyJSON<100/dayLive
Bank of Canada ValetBank of Canada series: daily CAD exchange rates, policy rate, bond yields and economic indicators.
Data & Knowledge › Economic Data
FreeNoneJSONUnlimitedLive
BCLawsFull text and structure of British Columbia's statutes, regulations and municipal bylaws as XML.
Data & Knowledge › Open Government Data
NoneXMLUnlimitedLive
Bible-apiBible verses and passages as JSON, by reference or at random, across many translations.
Data & Knowledge › Books
FreeNoneJSON10k+/dayLive
BidledgerDaily-rebuilt index of open EU public procurement tenders from TED, searchable by country and CPV sector.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Big Book APISemantic search, filtering, sorting, and recommendations across millions of books.
Data & Knowledge › Books
FreemiumAPI keyJSON<100/dayLive
Big Data ExplainedList prices for major cloud data warehouses (BigQuery, Snowflake, Redshift, etc.) with history.
Data & Knowledge › Datasets
FreeNoneJSONUnlimitedLive
BLS Public Data APIUS inflation (CPI), jobs, unemployment, wages and producer prices from the Bureau of Labor Statistics.
Data & Knowledge › Economic Data
FreeNoneJSON100–1k/dayLive
BotsArchiveLooks up Telegram bots by username, returning category, star rating, and community votes.
Data & Knowledge › Datasets
NoneJSON—Live
BrasilAPIBrazilian public data lookups: postal codes, company registry (CNPJ), banks, holidays, DDD codes and more.
Data & Knowledge › Open Government Data
FreeNoneJSON—Live
Brazil Central Bank Open DataBrazil's central bank open data: intraday PTAX exchange rates, interest rates, institution registries.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Brazilian Chamber of Deputies Open DataBrazilian federal deputies, bills, votes, committees, sessions, and parliamentary expense records.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
BuildDataBuilding permits, licences, zoning, inspections and contractor records from 55 Canadian cities.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON100–1k/dayLive
Callook.infoLooks up US amateur radio callsigns against current FCC license data, with license and address details.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Census.govUS Census Bureau demographic, economic and geographic data (ACS, decennial census, and more) by area.
Data & Knowledge › Census & Demographics
FreeAPI keyJSONUnlimitedUntested
Chinese Text ProjectFull texts and metadata for pre-modern Chinese philosophy, history and literature works.
Data & Knowledge › Dictionaries
FreemiumAPI keyJSON—Live
City, GdańskCity of Gdańsk open data portal: live road-weather sensors, demographics, budgets and more via CKAN's API.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
City, GdyniaCity of Gdynia open data: demographics, utilities and municipal indicator datasets via a CKAN datastore API.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
City, Nantes Open DataOver 500 open datasets on Nantes Métropole — public markets, transit, environment, civic data.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
City, Toronto Open DataCity of Toronto's CKAN data catalogue: transit, housing, health, safety and civic datasets via REST API.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
civicAPILive election results, race calls and candidate vote counts for races worldwide, no key needed.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
CNPJ.WIKILooks up Brazilian companies by CNPJ using official Receita Federal registry data, no key.
Data & Knowledge › Open Government Data
FreeNoneJSON10k+/dayLive
College ROI30-year net present value and lifetime ROI for 500 US colleges and 134 majors, from IPEDS/FREOPP/BEA data.
Data & Knowledge › Education
FreeNoneJSONUnlimitedLive
College ScorecardU.S. college and university data: costs, admissions, graduation rates, student outcomes, by school or program.
Data & Knowledge › Education
FreeAPI keyJSON10k+/dayLive
CollinsBilingual dictionary and thesaurus data (definitions, translations, word forms) from HarperCollins.
Data & Knowledge › Dictionaries
—Untested
Colorado Information MarketplaceColorado state government's Socrata data portal with hundreds of queryable public datasets via the SODA API.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Companies HouseUK company registry lookups: officers, filings, addresses and status for registered companies.
Data & Knowledge › Open Government Data
API keyJSON—Live
Conversor IAE CNAESpanish IAE/CNAE tax activity code lookup and crosswalk, sourced from AEAT, INE and BOE.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON100–1k/dayLive
CORESearch and metadata for 200M+ open-access research papers aggregated from repositories worldwide.
Data & Knowledge › Academic
FreemiumAPI keyJSON10k+/dayDegraded
CourtListenerUS court opinions, dockets, judges and oral-argument audio, searchable by court, case number or citation.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON100–1k/dayLive
Crossref Metadata SearchSearch and fetch metadata for scholarly works by DOI, title, author, funder, or journal.
Data & Knowledge › Academic
FreemiumNoneJSONUnlimitedLive
Cyprus National Opendata PortalCyprus's national open data catalog: government datasets with per-dataset DCAT JSON/XML exports.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Data USAUS Census/government data — population, jobs, education, industry — queryable by state and year.
Data & Knowledge › Census & Demographics
FreeNoneJSONUnlimitedLive
Data WASearch Western Australian public-sector open datasets — transport, environment, health, planning.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
data.go.krPortal of thousands of individually keyed Korean government Open APIs covering weather, transit, and more.
Data & Knowledge › Open Government Data
API keyJSON—Untested
Data.gov Catalog APISearches metadata for the U.S. government's catalog of public datasets.
Data & Knowledge › Open Government Data
FreeAPI keyJSON10k+/dayDegraded
Data.gov.beBelgium's federal open-data catalog metadata as linked-data triples, via a Triple Pattern Fragments server.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedUntested
data.gov.ieCKAN catalog API for Ireland's open-data portal, listing and searching government datasets.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
data.gov.ukSearch and read thousands of UK government datasets (crime, transport, health, environment) via CKAN.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
DatamuseFinds words matching meaning, sound, spelling pattern or related-word constraints for language tools.
Data & Knowledge › Dictionaries
FreeNoneJSON10k+/dayLive
DataStreamCanadian water-quality monitoring data: sample locations, observations, and dataset metadata via OData.
Data & Knowledge › Datasets
FreeAPI keyJSON—Live
DataVic (Victoria Open Data)Query thousands of Victorian government datasets (transport, planning, environment) via CKAN.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
dati.gov.itCKAN catalog API for Italy's open-data portal, listing and searching government datasets.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Datos Abiertos Colombia (Socrata API)Socrata-based catalog of Colombian government datasets, queryable per-dataset with SoQL filters.
Data & Knowledge › Open Government Data
NoneJSON—Live
datos.gob.esCatalog and metadata API for Spain's public-sector open data, over 116,000 government datasets.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
DAWUMGerman election poll results by party, institute and parliament, updated as new polls are entered.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
DBnomicsMillions of economic time series from the IMF, OECD, Eurostat, central banks and national statistics offices.
Data & Knowledge › Economic Data
FreeNoneJSONUnlimitedLive
DBpedia SPARQL endpointSPARQL queries over facts extracted from Wikipedia infoboxes: people, places, works and their links.
Data & Knowledge › Wikipedia & Reference
FreeNoneJSON10k+/dayDegraded
Dedline.io APIUS state voter registration deadlines plus online and same-day registration rules for each election.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Deutscher Bundestag DIPSearch API for German Bundestag legislative proceedings, motions, printed matter and speakers.
Data & Knowledge › Open Government Data
API keyJSON—Untested
DistrictAPILooks up US school districts and schools by address, with enrollment, spending and boundary data.
Data & Knowledge › Education
FreemiumAPI keyJSON<100/dayLive
ECB Data Portal APIEuro-area time series from the ECB: reference FX rates, policy rates, inflation, money supply and bond yields.
Data & Knowledge › Economic Data
FreeNoneXMLUnlimitedLive
EcondbAggregated macroeconomic time-series data (GDP, inflation, trade) from statistics offices worldwide.
Data & Knowledge › Economic Data
FreemiumAPI keyJSON—Live
eCourtsIndiaSearch and retrieve Indian court case records, orders, cause lists and judge/advocate directories.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON—Live
EdgrapiNormalized JSON for SEC filings, SAM.gov contracts, USAspending awards and congressional stock trades.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON—Live
EditalMDSearch Brazilian public-procurement notices (PNCP) with deadlines, converted into readable Markdown documents.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON—Live
Education Data Portal API (Urban Institute)Yearly US school, district and college data: enrolment, finances, admissions, outcomes, civil rights.
Data & Knowledge › Education
FreeNoneJSON—Live
eeemojiLooks up emoji metadata by name: keywords, category, platform shortcodes and skin-tone variants.
Data & Knowledge › Dictionaries
FreeNoneJSON10k+/dayLive
EPO Open Patent ServicesSearch European and worldwide patent bibliographic, full-text and legal-status data from the EPO.
Data & Knowledge › Academic
FreeOAuthXML—Live
Europe PMCSearch abstracts and full text of biomedical and life-science research literature.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
FBI Crime Data ExplorerUS crime counts, arrests, hate crimes and NIBRS estimates by nation, state or police agency from FBI UCR data.
Data & Knowledge › Open Government Data
API keyJSON10k+/dayLive
FBI WantedFBI's most-wanted and seeking-information cases, with photos, descriptions and reward details.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Fed TreasuryUS Treasury data on federal debt, revenue, spending, interest rates, and savings bonds.
Data & Knowledge › Economic Data
FreeNoneJSONUnlimitedLive
Federal RegisterSearch and fetch daily US federal rules, proposed rules, notices and executive orders.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Find Case Law (UK National Archives)UK court judgments and tribunal decisions as an Atom feed plus full-text Akoma Ntoso XML for each ruling.
Data & Knowledge › Open Government Data
FreeNoneXML10k+/dayLive
FREDHundreds of thousands of US and global economic time series (GDP, rates, employment) from the St. Louis Fed.
Data & Knowledge › Economic Data
FreeAPI keyJSON—Live
FXMacroDataCentral-bank rates, inflation, GDP and other macro releases for 18 currencies, from official publishers.
Data & Knowledge › Economic Data
FreemiumAPI keyJSON100–1k/dayLive
Ganjoor APIFull-text archive of classical Persian poets and poems, with search, categories, and random-poem lookup.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
GankdatAggregates UK/EU government tenders, planning, sanctions and other public records as JSON
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON<100/dayLive
Genderize.ioPredicts likely gender for a first name using a database of over 1 billion people.
Data & Knowledge › Census & Demographics
FreemiumAPI keyJSON<100/dayDegraded
GENESIS-OnlineGermany's official statistics database covering economy, population and society via a REST/JSON web service.
Data & Knowledge › Census & Demographics
FreeJSON—Untested
Get Started with Web3Bilingual Web3 lesson index, glossary lookups, search, and role-based learning paths, with source citations.
Data & Knowledge › Wikipedia & Reference
FreeNoneJSONUnlimitedLive
Google Books APISearches Google's book catalog for metadata, previews and availability by title, author or ISBN.
Data & Knowledge › Books
API keyJSON—Degraded
HelloSalutReturns a localized 'hello' greeting by IP address, country code or language code.
Data & Knowledge › Dictionaries
FreeNoneJSONUnlimitedLive
Humanitarian Data ExchangeStandard CKAN API over thousands of open humanitarian and crisis-response datasets from UN OCHA.
Data & Knowledge › Datasets
FreeNoneJSONUnlimitedLive
i6eal Open AI DataSource-cited datasets on German/EU AI procurement, budgets, court rulings, regulators and public AI systems.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
IBGEBrazil's statistics agency: geographic divisions, census counts, and aggregated economic indicators.
Data & Knowledge › Census & Demographics
NoneJSONUnlimitedLive
InfraNodeAggregates weather, air quality, traffic, transit, and civic data for 84 German cities.
Data & Knowledge › Open Government Data
FreeNoneJSON10k+/dayLive
inspirehep.netSearches high-energy physics literature, authors, institutions, conferences and datasets.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
Internet ArchiveWayback Machine snapshots and Archive.org item metadata/search from the Internet Archive nonprofit.
Data & Knowledge › Books
FreeNoneJSON—Live
ISBNdbBook metadata by ISBN, title or author: publisher, binding, pages, subjects, synopsis, covers and list prices.
Data & Knowledge › Books
Free trialAPI keyJSON—Live
Istanbul (İBB) Open DataIstanbul municipality datasets on transit, traffic, environment and city services, queryable or downloadable.
Data & Knowledge › Open Government Data
FreeJSON—Untested
KaggleSearches and downloads community-uploaded machine learning datasets, notebooks, and competitions.
Data & Knowledge › Datasets
API keyJSON—Live
Mandi Price APIFree keyless REST API for daily Indian mandi (wholesale crop) prices across 5 states, from data.gov.in.
Data & Knowledge › Open Government Data
FreeNoneJSON1k–10k/dayLive
Merriam-WebsterWord definitions, etymology, audio pronunciation and thesaurus data from Merriam-Webster's reference works.
Data & Knowledge › Dictionaries
FreemiumAPI keyJSON1k–10k/dayLive
ModelPartFinder Error CodesLooks up appliance/equipment error codes by brand and code, returning cause and replacement part SKUs.
Data & Knowledge › Datasets
FreeNoneJSON—Live
NameGenderPredicts gender and confidence from a first name, full name, email address, or username.
Data & Knowledge › Census & Demographics
FreemiumAPI keyJSON100–1k/dayLive
NASA ADSSearch astronomy and physics research literature: paper metadata, abstracts, and citation data.
Data & Knowledge › Academic
FreeAPI keyJSON1k–10k/dayLive
National Open Data Catalog, Czech RepublicSPARQL access to the Czech Republic's national catalog of open government datasets.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Nationalize.ioEstimates a person's likely nationality (ranked country probabilities) from their first name.
Data & Knowledge › Census & Demographics
FreemiumAPI keyJSON<100/dayDegraded
Neotimo DGFiP MirrorLooks up a French company's SIRET/SIREN in the DGFiP e-invoicing platform registry.
Data & Knowledge › Open Government Data
FreeNoneJSON10k+/dayLive
Nobel Prize APIStructured records of every Nobel Prize and laureate since 1901, including bios and citations.
Data & Knowledge › Datasets
FreeNoneJSONUnlimitedLive
Numbers API (Math.Tools)Answers number-theory questions (prime, palindrome, factors), converts bases and spells numbers out.
Data & Knowledge › Wikipedia & Reference
PaidAPI keyJSON—Live
NYC Open DataLive queries against NYC's public Socrata datasets (311 requests, housing, transit, budget, etc).
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
ONS API (Office for National Statistics)UK official statistics and Census 2021 data: population, households, labour market and prices by area.
Data & Knowledge › Census & Demographics
FreeNoneJSON10k+/dayLive
Open Data MinneapolisCity of Minneapolis GIS and civic datasets (fires, crime, permits, etc.) via ArcGIS FeatureServer queries.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Data UmeåUmeå municipality's open-data catalog: 330+ datasets on climate, environment, city services and stats.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government Canada (CKAN Action API)Searches and retrieves metadata for Canada's federal open-government dataset catalog via CKAN.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, ACTQueryable government datasets for the ACT (Canberra) region: environment, transport, parks and civic data.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, ArgentinaArgentina's official open-data portal, with a time-series API for economic, energy and social indicators.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, AustraliaStandard CKAN API to search and retrieve metadata for 140,000+ Australian government datasets.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, AustriaMetadata search across Austria's federal open-government datasets (DCAT-AP catalog).
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, DenmarkCKAN API to list and query open datasets published by Danish municipalities and regions.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, FranceREST API to search and read France's national open-data catalog (datasets, organizations, reuses).
Data & Knowledge › Open Government Data
FreeAPI keyJSONUnlimitedLive
Open Government, GermanySearch and read metadata for Germany's open government datasets via CKAN, RDF, Turtle or JSON-LD.
Data & Knowledge › Open Government Data
FreeNoneXMLUnlimitedLive
Open Government, GreeceSearch and read metadata for Greece's open government datasets via the CKAN action API.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, IndiaIndia's national open data portal: census, agriculture and economy datasets through a resource API.
Data & Knowledge › Open Government Data
—Untested
Open Government, KazakhstanKazakhstan's open-data portal API for government datasets such as crime records, queried with an API key.
Data & Knowledge › Open Government Data
API keyJSON—Live
Open Government, LuxembourgLuxembourg's official open-data catalog: search, filter and download 3,000+ government datasets.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, MalaysiaMalaysia's official open-data API covering statistics, fuel prices, weather and transit, no key needed.
Data & Knowledge › Open Government Data
FreeNoneJSON1k–10k/dayLive
Open Government, MexicoMexico's national statistics API: economic, demographic and geographic indicators by state and municipality.
Data & Knowledge › Census & Demographics
FreeAPI keyJSONUnlimitedUntested
Open Government, NetherlandsCKAN metadata search over 20,000+ Dutch government datasets: packages, resources, organizations.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, New South WalesCKAN metadata search over 17,000+ NSW Government open datasets, packages and organizations.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, New ZealandNZ Government open dataset catalog covering agencies, councils and Crown entities.
Data & Knowledge › Open Government Data
JSON—Untested
Open Government, NorwayNorway's central catalog of public datasets, concepts and APIs contributed by government and private bodies.
Data & Knowledge › Open Government Data
NoneJSON—Untested
Open Government, PeruPeru's national open data portal: thousands of government datasets queryable via a CKAN-style API.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, PolandPoland's national open-data catalog API: search and fetch metadata for 27,000+ government datasets.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, Queensland GovernmentQueensland Government's CKAN data catalog: search and pull 188,000+ public datasets by keyword.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, SloveniaSlovenia's CKAN-based government open-data catalog: search, list, and download datasets from public bodies.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
Open Government, South Australian GovernmentSouth Australia's open-data portal: government datasets on demographics, health and environment via CKAN.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Open Government, SwedenStatistics Sweden's official statistical database API: population, economy, labour market and more.
Data & Knowledge › Census & Demographics
FreeNoneJSON—Live
Open LibraryBook, edition, author and cover data crowdsourced by the Internet Archive; free lookups by ISBN or title.
Data & Knowledge › Books
FreeNoneJSON10k+/dayLive
Open ScholarshipsFree, CC-BY-licensed directory of US scholarships and student aid, currently covering Nevada.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
Open Science FrameworkRead and manage public research projects, preprints, files and metadata on the OSF repository.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
OpenAlexOpen index of 250M+ scholarly works, authors, institutions, journals and research topics.
Data & Knowledge › Academic
FreemiumNoneJSON10k+/dayLive
OpenCitationsOpen scholarly citation links: references and citing works for a DOI, PMID or OMID, as JSON or CSV.
Data & Knowledge › Academic
FreeNoneJSON10k+/dayLive
OpenCorporatesCompany registry data (officers, filings, addresses) sourced from official registers in many countries.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON<100/dayLive
opendata.swiss APICKAN-based search over ~16,000 Swiss federal, cantonal, and municipal open datasets.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
OpenFECCampaign finance data: candidates, committees, donations, and spending in US federal elections.
Data & Knowledge › Open Government Data
FreeAPI keyJSON10k+/dayLive
OpenMercantilSearch Spanish company registry (BORME) filings, corporate profiles and officer data.
Data & Knowledge › Open Government Data
FreemiumNoneJSON100–1k/dayLive
Oxford Dictionaries APIDefinitions, pronunciations, synonyms and translations from Oxford's dictionary data, by word lookup.
Data & Knowledge › Dictionaries
API keyJSON—Live
Pan Africa DataAfrican macroeconomic, demographic and income-distribution indicators, 2000–2035, by country and region.
Data & Knowledge › Economic Data
FreemiumNoneJSON—Live
Personality.fyiMBTI type profiles and OEJTS personality-test scoring, CC0-licensed, no key required.
Data & Knowledge › Datasets
FreeNoneJSONUnlimitedLive
PoetryDBSearches a fixed collection of public-domain poems by author, title, or line, returning JSON.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
PotterAPIHarry Potter books, characters, houses and spells, in six languages, with images.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
ProcureDataSearches Canadian federal and provincial government tenders, contracts, and awards back to 2008.
Data & Knowledge › Open Government Data
FreemiumAPI keyJSON100–1k/dayLive
PublicDataHubUS school, hospital and federal agency figures as JSON/CSV, each one sourced and dated.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Random LexiconRandom English words with Wiktionary-sourced definitions, filterable by part of speech, tags, length.
Data & Knowledge › Dictionaries
FreeNoneJSONUnlimitedLive
Represent by Open NorthCanadian elected representatives and electoral boundaries, searchable by postal code or address.
Data & Knowledge › Open Government Data
FreeNoneJSON10k+/dayLive
Right to Disconnect APIRight-to-disconnect employment law status, statutes and sanctions for all 27 EU countries.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Scholar SidekickResolves DOI, PMID, ISBN and arXiv IDs into formatted citations, exports, and fabrication/retraction checks.
Data & Knowledge › Academic
FreemiumNoneJSON<100/dayLive
SefariaJewish text library API: Torah, Talmud and commentary text, versions, and cross-reference links.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
Semantic ScholarSearch and retrieve papers, authors and citation graphs across 200M+ scholarly works.
Data & Knowledge › Academic
FreemiumAPI keyJSON—Degraded
SHAREAggregated metadata about research releases, datasets and preprints from many source registries.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
Socrata Open Data API (SODA)The SODA query API behind hundreds of government and NGO open-data portals, for filtering tabular datasets.
Data & Knowledge › Open Government Data
FreeAPI keyJSONUnlimitedLive
SofiaplanOpen urban-planning datasets for Sofia: addresses, air quality, archaeology, land use and more.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
Statistics of the WorldAggregates 335+ economic, health and social indicators for 218 countries from IMF, World Bank, and WHO.
Data & Knowledge › Economic Data
FreemiumNoneJSON1k–10k/dayLive
Stephen King APIDetails on Stephen King's novels, short stories, and villains, including publisher and page counts.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
Synonyms API (STANDS4)Looks up synonyms, antonyms and a short definition for an English word, in XML or JSON.
Data & Knowledge › Dictionaries
FreemiumAPI keyXML<100/dayLive
Tatoeba APIExample sentences in 400+ languages with linked translations, searchable by word and language.
Data & Knowledge › Dictionaries
FreeNoneJSON—Live
The Gazette DataUK official public record: company insolvency, wills/probate, appointments, honours notices as linked data.
Data & Knowledge › Open Government Data
FreemiumNoneJSONUnlimitedLive
TilthDaily AI-modelled UK fertiliser price estimates (GBP/tonne) for nine grades, plus history and market data.
Data & Knowledge › Datasets
FreeNoneJSONUnlimitedLive
TroveSearches Australia's National Library archive of digitised newspapers, books, images, and records.
Data & Knowledge › Academic
FreeAPI keyJSON10k+/dayLive
UK Legislation ChangesTracks amendment history of UK legislation provisions, sourced from legislation.gov.uk.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
UK PoliceUK street-level crime, stop-and-search, neighbourhood teams and police-force data by location.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
UniDbUK university and course data (demographics, ratings, popularity, value) from HESA and government statistics.
Data & Knowledge › Education
FreemiumAPI keyJSON—Live
Universities List (Hipo University Domains List)Searchable directory of world university names, countries, and official email domains.
Data & Knowledge › Education
FreeNoneJSONUnlimitedLive
University of Oslo Open DataCourse, programme, and schedule data for University of Oslo, published under an open-data licence.
Data & Knowledge › Academic
FreeNoneJSONUnlimitedLive
Urantia PapersFull-text and semantic search over the Urantia Book papers, sections and paragraphs, with audio.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
Urban ObservatoryLive and historic readings from Newcastle's urban sensors: traffic, weather, air quality and buildings.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
US Treasury Daily Interest Rate FeedDaily US Treasury par yield curve (1-month to 30-year), real yields, T-bill and long-term rates in XML.
Data & Knowledge › Economic Data
FreeNoneXMLUnlimitedDegraded
USAspending.govU.S. federal spending data: contracts, grants, agency budgets and award recipients from the DATA Act.
Data & Knowledge › Open Government Data
NoneJSONUnlimitedLive
USPTOUS patent and trademark filings, examination status, PTAB decisions, and ownership assignment records.
Data & Knowledge › Open Government Data
FreeAPI keyJSONUnlimitedUntested
Voidly AtlasGlobal internet censorship data: incident counts, evidence sources and per-country blocking stats.
Data & Knowledge › Datasets
FreemiumAPI keyJSONUnlimitedLive
VotePredictorUS election win-probability forecasts, congressional records and pollster accuracy ratings.
Data & Knowledge › Open Government Data
FreeNoneJSONUnlimitedLive
WikidataStructured facts and relationships about people, places and concepts from Wikimedia's public knowledge base.
Data & Knowledge › Wikipedia & Reference
FreeNoneJSONUnlimitedLive
WikipediaFull-text article content, search, metadata and page history from Wikipedia and other wikis.
Data & Knowledge › Wikipedia & Reference
FreeNoneJSONUnlimitedLive
WiktionaryWikimedia's collaborative dictionary: word definitions, etymologies, and translations by page title.
Data & Knowledge › Dictionaries
FreeNoneJSONUnlimitedLive
Wizard WorldFan-curated Harry Potter data: houses, elixirs, spells, wizards, and ingredients.
Data & Knowledge › Books
NoneJSONUnlimitedLive
WolframAlphaComputational answer engine returning direct answers, data, and visualizations for math and factual queries.
Data & Knowledge › Wikipedia & Reference
FreemiumAPI key<100/dayLive
Wolne LekturyTexts, audiobooks and metadata for Polish public-domain literature, browsable by author, epoch and genre.
Data & Knowledge › Books
FreeNoneJSONUnlimitedLive
WordnikEnglish word definitions, synonyms, examples and audio pronunciations from five dictionaries.
Data & Knowledge › Dictionaries
FreemiumAPI keyJSON1k–10k/dayLive
WordsAPIDefinitions, synonyms, antonyms, rhymes and word relationships for over 150,000 English words.
Data & Knowledge › Dictionaries
FreemiumAPI keyJSON1k–10k/dayLive
World BankGlobal development, economic, and social indicators by country and year, back decades.
Data & Knowledge › Economic Data
FreeNoneJSONUnlimitedLive

Choosing a Data & Knowledge API

Is there a free Data & Knowledge API?

Yes. Wikipedia, FRED, api.data.gov, ArgentinaDatos, arXiv and 100 others are free to use, and OpenAlex, Agify.io, API.Bible, Apiverket, Big Book API and 31 others have a free tier alongside paid plans.

Which Data & Knowledge APIs work without an API key?

Wikipedia, OpenAlex, API Colombia, ArgentinaDatos, arXiv and 117 others need no key or sign-up, so you can try them with a plain request.

Can I call a Data & Knowledge API from front-end JavaScript?

OpenAlex, API Colombia, ArgentinaDatos, Bank of Canada Valet, Bible-api and 96 others allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.

Can I use Data & Knowledge APIs in a commercial project?

Wikipedia, OpenAlex, AcreLens, Agify.io, Bank of Canada Valet and 65 others permit commercial use. FRED, Apiverket, arXiv, Big Book API, CNPJ.WIKI and 10 others restrict it, for example to non-commercial or attributed use, so read the terms first.

Which Data & Knowledge APIs work with AI agents?

DistrictAPI, Gankdat and Urantia Papers have both an MCP server and an OpenAPI spec. OpenAlex, College ROI, EditalMD, InfraNode, Statistics of the World and 3 others have an MCP server, so an AI agent can call them directly. API Colombia, api.data.gov, Apiverket, Ayes and Noes, Bank of Canada Valet and 39 others publish an OpenAPI spec for generating clients and tools.

Browse by subcategory: Wikipedia & Reference APIs · Dictionaries APIs · Books APIs · Academic APIs · Open Government Data APIs · Economic Data APIs · Census & Demographics APIs · Datasets APIs · Education APIs

Popular topics: Thesaurus APIs · ISBN Lookup APIs · Patents APIs · Citations APIs · Congress & Legislation APIs · Crime Data APIs · Court & Legal Records APIs