Free API directory
APIs 37 curated public APIs — mostly free and no-auth — spanning research, finance, geography, health, standards, careers, code and media. Hit Try it to run a live call through the AllFrontierGlobal proxy.
250M+ scholarly works, authors, institutions. no key
https://api.openalex.org/works?search=knowledge%20graph&per_page=3Metadata for 150M+ scholarly documents (DOIs). no key
https://api.crossref.org/works?query=knowledge&rows=3AI-powered academic graph & citations. no key
https://api.semanticscholar.org/graph/v1/paper/search?query=knowledge&limit=3&fields=title,yearPhysics, CS, math, econ preprints. no key
http://export.arxiv.org/api/query?search_query=all:knowledge&max_results=3Book metadata, editions, authors (Internet Archive). no key
https://openlibrary.org/search.json?q=strategy&limit=3Article summaries, media, related pages. no key
https://en.wikipedia.org/api/rest_v1/page/summary/KnowledgeStructured entity graph — sameAs / identifiers. no key
https://www.wikidata.org/w/api.php?action=wbsearchentities&search=knowledge&language=en&format=json&limit=3218 countries · 1,400+ development indicators. no key
https://api.worldbank.org/v2/country/WLD/indicator/NY.GDP.MKTP.CD?format=json&mrv=1Global macro-financial statistics. no key
no keyEconomic & social data across members. no key
no keyECB reference exchange rates, historical. no key
https://api.frankfurter.app/latest?from=USD&to=EUR,INR,GBP800k+ US & world economic time series. free key
free keyEuro-area monetary & financial statistics. no key
no keyGeocoding & reverse-geocoding (OpenStreetMap). no key
https://nominatim.openstreetmap.org/search?q=Chandigarh&format=json&limit=3Places, admin boundaries, postal codes. free user
free userFree weather forecast & historical, no key. no key
https://api.open-meteo.com/v1/forecast?latitude=30.7&longitude=76.8¤t=temperature_2mSolar & meteorological data, global. no key
no keyGlobal Health Observatory indicators (OData). no key
https://ghoapi.azureedge.net/api/Indicator?$top=535M+ biomedical citations (NCBI). no key ≤3/s
https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=nutrition&retmax=3&retmode=jsonEU skills, competences & occupations. no key
https://ec.europa.eu/esco/api/search?text=marketing&language=en&type=skill&limit=5900+ US occupations, skills & abilities. free reg
free regRFCs & internet standards, machine-readable. no key
https://datatracker.ietf.org/api/v1/doc/document/?title__icontains=http&limit=3&format=jsonStandards metadata, technical committees, ICS. no key
no keyRepositories, code, issues, users. no key (low rate)
https://api.github.com/search/repositories?q=knowledge-graph&per_page=3JS package search & metadata. no key
https://registry.npmjs.org/-/v1/search?text=graph&size=3Tech news & discussion (Algolia). no key
https://hn.algolia.com/api/v1/search?query=knowledge&tags=story&hitsPerPage=3Music, podcasts, apps, media metadata. no key
https://itunes.apple.com/search?term=jazz&limit=3Tracks, albums, artists. no key
https://api.deezer.com/search?q=jazz&limit=3Open music encyclopedia. no key
https://musicbrainz.org/ws/2/artist?query=miles+davis&fmt=json&limit=3GPT models, embeddings, tools. key
keyClaude models & tool use. key
keyMultimodal models & long context. key
keyUltra-fast open-model inference. key
key100k+ open models & datasets. key/no-key
key/no-keyUS open government datasets. no key
no keyEuropean Union open datasets. no key
no keyIndia Open Government Data (OGD). free key
free key