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Best Open Data APIs in 2026

The top 15 of 78 free Open Data APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. Microlink.io API takes the top spot.

Last tested Oct 24, 2026 · Rankings update daily

Ranking

  1. 1Microlink.io logo

    Microlink.io API

    Online · 378 ms

    Extract structured data from any website.

    • No API key needed
    • Fast: 378 ms response
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  2. 2OpenSanctions logo

    OpenSanctions API

    Online · 343 ms

    Data on international sanctions, crime and politically exposed persons.

    • No API key needed
    • Fast: 343 ms response
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  3. 3PayCrunch logo

    PayCrunch API

    Online · 278 ms

    US wages for 1,008 occupations and by state, from BLS OEWS May 2025, static JSON, CC BY 4.0.

    • No API key needed
    • Fast: 278 ms response
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  4. 4221 logo

    221 API

    Online · 527 ms

    Senegal reference data: public holidays, mobile operators, banks, communes, legal forms.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  5. 5API Setu logo

    API Setu API

    Online · 1199 ms

    An Indian Government platform that provides a lot of APIS for KYC, business, education & employment.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  6. 6Big Data Explained logo

    Big Data Explained API

    Online · 788 ms

    Cloud data warehouse list prices, read daily from AWS and Azure pricing APIs, with price history.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  7. 7BTU Graph logo

    BTU Graph API

    Online · 839 ms

    Source-reviewed energy company knowledge graph and directory exports.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  8. 8CollegeCalcAI logo

    CollegeCalcAI API

    Online · 531 ms

    US college admission chance estimates and admissions data for 1,100+ colleges.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  9. 9EOSL logo

    EOSL API

    Online · 607 ms

    Hardware end-of-sale and end-of-service-life dates by part number, source-linked.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  10. 10i6eal Open AI Data logo

    i6eal Open AI Data API

    Online · 624 ms

    Open datasets on AI policy, regulation and public-sector adoption in Germany and the EU.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  11. 11Kvartiry-Phuket logo

    Kvartiry-Phuket API

    Online · 748 ms

    Russian-language Phuket real estate guides, asking prices, condo assessment rates, weather, beaches.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  12. 12MostExpensiveWatches logo

    MostExpensiveWatches API

    Online · 776 ms

    Documented luxury watch auction records, live listings, valuations and price indices.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  13. 13Nobel Prize logo

    Nobel Prize API

    Online · 653 ms

    Open data about nobel prizes and events.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  14. 14ProductGuru logo

    ProductGuru API

    Online · 676 ms

    Consumer product-safety recall notices from 11 government registers, looked up by barcode (EAN/GTIN).

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  15. 15PublicDataHub logo

    PublicDataHub API

    Online · 532 ms

    US public schools, hospitals and federal agency budgets as JSON/CSV, with provenance.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS

Open Data APIs compared

Top Open Data APIs compared
APIAPI keyHTTPSCORSUptimeResponseRating
Microlink.io logoMicrolink.ioNoYesYesUp378 msNot rated
OpenSanctions logoOpenSanctionsNoYesYesUp343 msNot rated
PayCrunch logoPayCrunchNoYesYesUp278 msNot rated
221 logo221NoYesYesUp527 msNot rated
API Setu logoAPI SetuNoYesYesUp1199 msNot rated
Big Data Explained logoBig Data ExplainedNoYesYesUp788 msNot rated
BTU Graph logoBTU GraphNoYesYesUp839 msNot rated
CollegeCalcAI logoCollegeCalcAINoYesYesUp531 msNot rated
EOSL logoEOSLNoYesYesUp607 msNot rated
i6eal Open AI Data logoi6eal Open AI DataNoYesYesUp624 msNot rated

More Open Data APIs

Best Open Data API FAQ

What is the best free Open Data API in 2026?

Based on access, reliability and developer ratings, the top free Open Data APIs right now are Microlink.io API, OpenSanctions API and PayCrunch API. Microlink.io API ranks first. Rankings update daily from health checks of all 78 Open Data APIs in the directory.

What is the best Open Data API without an API key?

Microlink.io API, OpenSanctions API and PayCrunch API need no API key, so you can call them without signing up. 53 of the 78 ranked Open Data APIs are keyless.

Which Open Data API works from the browser?

Microlink.io API, OpenSanctions API and PayCrunch API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.

How are these APIs ranked?

Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.