Building a kids' education site
The APIs you would realistically stitch together, grouped by role: core data first, then enrichment, images and location.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
7Timer!GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
Amanah SunnahQuran verses, hadith from 8 classical collections, tafsir, and narrator biographies with grading data. Culture & Society › Religion | Free | API key | JSON | Unlimited | Live |
An API of Ice And FireCharacters, houses, and books from A Song of Ice and Fire and the Game of Thrones TV series. Media & Entertainment › Movies & TV | Free | None | JSON | 10k+/day | Live |
API ColombiaColombia reference data: departments, cities, tourist sites, airports, presidents and more. Data & Knowledge › Open Government Data | None | JSON | Unlimited | Live | |
Art Institute of ChicagoMuseum collection data for 130,000+ artworks — artists, mediums, dates, and IIIF images. Culture & Society › Art & Museums | Free | None | JSON | 10k+/day | Live |
AstronomyAPISun, Moon and planet positions and events for any place and date, plus rendered star charts and moon images. Weather & Environment › Astronomy | Free | API key | JSON | Unlimited | Live |
Bhagavad Gita teluguBhagavad Gita verses by chapter/verse with Telugu, English, Spanish or Odia translation and commentary. Culture & Society › Religion | None | JSON | Unlimited | Live | |
Big Book APISemantic search, filtering, sorting, and recommendations across millions of books. Data & Knowledge › Books | Freemium | API key | JSON | <100/day | Live |
Black History FactsApproved, user-submitted Black history facts, searchable by tag or person or served at random. Culture & Society › History | API key | JSON | — | Live | |
BootprintReturns a random image and fact about a celestial object like Mars, Jupiter or the Moon. Health & Science › Space | Free | None | JSON | Unlimited | Live |
Cat FactsReturns random cat trivia and breed facts, one endpoint, no key required. Nature & Outdoors › Animals | None | JSON | Unlimited | Live | |
Cat FactsRandom cat trivia facts from a keyless, community-sourced JSON endpoint. Nature & Outdoors › Animals | Free | None | JSON | Unlimited | Live |
Chinese Text ProjectFull texts and metadata for pre-modern Chinese philosophy, history and literature works. Data & Knowledge › Dictionaries | Freemium | API key | JSON | — | Live |
Chronicling AmericaSearchable full text and metadata for millions of digitized historic US newspaper pages. Culture & Society › History | Free | None | JSON | — | Live |
CodeCogs Equation EditorRenders LaTeX equations as PNG, SVG, GIF, EMF, or PDF images from a plain URL. Utilities › Conversion | Freemium | None | Binary | 1k–10k/day | Live |
College ROI30-year net present value and lifetime ROI for 500 US colleges and 134 majors, from IPEDS/FREOPP/BEA data. Data & Knowledge › Academic | Free | None | JSON | Unlimited | Live |
College ScorecardU.S. college and university data: costs, admissions, graduation rates, student outcomes, by school or program. Data & Knowledge › Open Government Data | Free | API key | JSON | 10k+/day | Live |
DatamuseFinds words matching meaning, sound, spelling pattern or related-word constraints for language tools. Data & Knowledge › Dictionaries | Free | None | JSON | 10k+/day | Live |
DiceBearGenerates deterministic SVG avatars from a seed string, with 60+ art styles to pick from. Developer Tools › Mock Data | Free | None | XML | Unlimited | Live |
DiceBearGenerates deterministic SVG or PNG avatars from a seed string, across dozens of styles. Media & Entertainment › Images & Photos | None | Binary | Unlimited | Live | |
Disney APILists Disney characters with their films, shows and games, each linked to its Disney Fandom source. Media & Entertainment › Movies & TV | Free | None | JSON | Unlimited | Live |
DistrictAPILooks up US school districts and schools by address, with enrollment, spending and boundary data. Data & Knowledge › Open Government Data | Freemium | API key | JSON | <100/day | Live |
Dog APIDog breed characteristics, photos, breed groups, and random facts, no key needed. Nature & Outdoors › Animals | Free | None | JSON | Unlimited | Live |
Dog FactsReturns random or indexed dog trivia facts from a small static dataset. Nature & Outdoors › Animals | None | JSON | Unlimited | Deprecated | |
Dog FactsRandom dog facts, breed data, and breed images from an open-source hobby project. Nature & Outdoors › Animals | Free | None | JSON | 10k+/day | Live |
DogsRandom dog photos by breed, sourced from the Stanford Dogs Dataset, no key needed. Nature & Outdoors › Animals | Free | None | JSON | Unlimited | Live |
English Random WordsRandom English words with definitions and pronunciations; also covers six other languages. Developer Tools › Mock Data | Free | None | JSON | — | Down |
Free Dictionary APIEnglish word definitions, phonetics, parts of speech, examples and synonyms, no key needed. Data & Knowledge › Dictionaries | Free | None | JSON | Unlimited | Down |
FruityviceBotanical family, genus, and per-100g nutrition data (calories, sugar, protein) for common fruits. Food & Drink › Nutrition | Free | None | JSON | Unlimited | Live |
Google Books APISearches Google's book catalog for metadata, previews and availability by title, author or ISBN. Data & Knowledge › Books | API key | JSON | — | Degraded | |
GutendexSearchable metadata for 79,000+ Project Gutenberg ebooks: titles, authors, subjects and download links. Data & Knowledge › Books | Free | None | JSON | Unlimited | Down |
Harvard Art MuseumsHarvard Art Museums' collection data: objects, artists, exhibitions, images, refreshed daily. Culture & Society › Art & Museums | Free | API key | JSON | 1k–10k/day | Live |
HebcalConverts Gregorian/Hebrew dates and returns Jewish holidays, Shabbat times, and Torah readings. Culture & Society › Holidays | Free | None | JSON | 10k+/day | Live |
HolidaysPublic holidays and observances for 250+ countries and 3,600+ states/provinces, in 100+ languages. Culture & Society › Holidays | Freemium | API key | JSON | — | Live |
Hyrule Compendium APIItems, creatures, and locations from The Legend of Zelda: Breath of the Wild and Tears of the Kingdom. Media & Entertainment › Games | Free | None | JSON | Unlimited | Live |
icanhazdadjokeServes a large library of dad jokes as random, by ID, as a Slack message, an image, or via search. Media & Entertainment › Jokes & Quotes | Free | None | JSON | Unlimited | Live |
iDigBioSearch millions of digitized natural history museum specimen records by taxon, locality and collector. Health & Science › Biology | None | JSON | Unlimited | Live | |
ISRO APIReference data on ISRO's launched spacecraft, launchers, customer satellites and centres. Health & Science › Space | Free | None | JSON | Unlimited | Live |
ITISUS government taxonomic database of scientific and common names, hierarchy and classification for species. Health & Science › Biology | Free | None | JSON | Unlimited | Live |
IUCN Red ListConservation status and extinction-risk data for assessed animal and plant species worldwide. Nature & Outdoors › Animals | API key | JSON | — | Untested | |
MeowFactsRandom cat facts by GET request, with count, id, and 13+ language options. Nature & Outdoors › Animals | None | JSON | Unlimited | Live | |
Merriam-WebsterWord definitions, etymology, audio pronunciation and thesaurus data from Merriam-Webster's reference works. Data & Knowledge › Dictionaries | Freemium | API key | JSON | 1k–10k/day | Live |
Metropolitan Museum of Art Collection APIMetadata and images for 470,000+ Met Museum artworks, CC0-licensed, no key required. Culture & Society › Art & Museums | Free | None | JSON | Unlimited | Live |
NASA Open APIsNASA's own gateway to astronomy picture of the day, Mars rover photos, asteroid and Earth imagery data. Health & Science › Space | Free | API key | JSON | 10k+/day | Degraded |
National Park ServiceUS national park details, alerts, campgrounds, visitor centers, events and photos, keyed by park code. Nature & Outdoors › Parks | Free | API key | JSON | 10k+/day | Live |
NewtonComputes math expressions: simplify, factor, derive, integrate, zeroes, trig functions. Utilities › Math | Free | None | JSON | Unlimited | Live |
Nobel Prize APIStructured records of every Nobel Prize and laureate since 1901, including bios and citations. Data & Knowledge › Datasets | Free | None | JSON | Unlimited | Live |
NoctuaSkyLooks up stars, planets and deep-sky objects by name; powers the Stellarium Web planetarium. Health & Science › Space | None | JSON | — | Live | |
Numbers API (Math.Tools)Answers number-theory questions (prime, palindrome, factors), converts bases and spells numbers out. Data & Knowledge › Encyclopedic | Paid | API key | JSON | — | Live |
Official Joke APIRandom general, knock-knock, programming, and dad jokes as setup/punchline JSON pairs. Media & Entertainment › Jokes & Quotes | None | JSON | Unlimited | Live | |
Open LibraryBook, edition, author and cover data crowdsourced by the Internet Archive; free lookups by ISBN or title. Data & Knowledge › Books | Free | None | JSON | 10k+/day | Live |
Open ScholarshipsFree, CC-BY-licensed directory of US scholarships and student aid, currently covering Nevada. Data & Knowledge › Academic | Free | None | JSON | Unlimited | Live |
Oxford Dictionaries APIDefinitions, pronunciations, synonyms and translations from Oxford's dictionary data, by word lookup. Data & Knowledge › Dictionaries | API key | JSON | — | Live | |
PlaceDogServes dog photos sized by URL path, useful as design and layout placeholders Nature & Outdoors › Animals | Free | None | Binary | Unlimited | Live |
PoetryDBSearches a fixed collection of public-domain poems by author, title, or line, returning JSON. Data & Knowledge › Books | Free | None | JSON | Unlimited | Live |
PokéAPIDetailed structured data on Pokémon species, moves, items, types and games from every generation. Media & Entertainment › Games | Free | None | JSON | Unlimited | Live |
PotterAPIHarry Potter books, characters, houses and spells, in six languages, with images. Data & Knowledge › Books | Free | None | JSON | Unlimited | Live |
PublicDataHubUS school, hospital and federal agency figures as JSON/CSV, each one sourced and dated. Data & Knowledge › Open Government Data | Free | None | JSON | Unlimited | Live |
PurgoMalumDetects and censors profanity/obscenity in text, including leetspeak substitutions, keyless. AI & Machine Learning › Moderation | Free | None | JSON | Unlimited | Live |
QuizAPIREST API for creating, generating, and embedding quizzes with AI-generated questions. Media & Entertainment › Games | Freemium | API key | JSON | <100/day | Live |
QuizBaseMultilingual trivia questions, deduped from 11 open datasets, each tagged with its source license. Media & Entertainment › Games | Freemium | API key | JSON | 100–1k/day | Live |
Quran APIFull Quran text plus 440+ translations in 90+ languages, served as static JSON, no key needed. Culture & Society › Religion | Free | None | JSON | Unlimited | Live |
RandomDuckRandom duck photos and GIFs, plus a JSON endpoint and per-image lookup by number. Nature & Outdoors › Animals | Free | None | JSON | Unlimited | Live |
REST CountriesNames, ISO codes, flags, currencies, languages, borders and current leaders for 250+ countries. Location & Mapping › Countries | Freemium | API key | JSON | <100/day | Live |
Scholar SidekickResolves DOI, PMID, ISBN and arXiv IDs into formatted citations, exports, and fabrication/retraction checks. Data & Knowledge › Academic | Freemium | None | JSON | <100/day | Live |
SefariaJewish text library API: Torah, Talmud and commentary text, versions, and cross-reference links. Data & Knowledge › Books | Free | None | JSON | Unlimited | Live |
Semantic ScholarSearch and retrieve papers, authors and citation graphs across 200M+ scholarly works. Data & Knowledge › Academic | Freemium | API key | JSON | — | Degraded |
Smithsonian Open AccessSearch and metadata for 11M+ CC0-licensed Smithsonian museum and archive collection records. Culture & Society › Art & Museums | Free | API key | JSON | — | Degraded |
Solar System OpenDataPhysical and orbital data for planets, moons, dwarf planets and asteroids in the solar system. Health & Science › Space | Free | API key | JSON | — | Live |
Sudoku100Generates random or difficulty-picked Sudoku puzzle images (PNG/SVG/WebP) with unique solutions. Media & Entertainment › Games | Free | None | Binary | Unlimited | Live |
Sunrise SunsetSunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
SWAPIStructured data on Star Wars people, planets, starships, vehicles, species and films. Media & Entertainment › Movies & TV | Free | None | JSON | Unlimited | Live |
SWAPI.techStar Wars reference data: people, planets, films, species, starships, and vehicles. Media & Entertainment › Movies & TV | None | JSON | Unlimited | Live | |
The Cat APIRandom cat images and breed facts, searchable by breed or image type. Nature & Outdoors › Animals | Freemium | API key | JSON | 100–1k/day | Live |
TrefleAround a million plant records: taxonomy, common names, distribution, images, edibility and growth traits. Nature & Outdoors › Plants | Free | API key | JSON | 10k+/day | Live |
UniDbUK university and course data (demographics, ratings, popularity, value) from HESA and government statistics. Data & Knowledge › Academic | Freemium | API key | JSON | — | Live |
USGS Earthquake CatalogSearchable global earthquake catalog by time, area, depth and magnitude, plus minute-updated GeoJSON feeds. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
WikidataStructured facts and relationships about people, places and concepts from Wikimedia's public knowledge base. Data & Knowledge › Encyclopedic | Free | None | JSON | Unlimited | Live |
WikipediaFull-text article content, search, metadata and page history from Wikipedia and other wikis. Data & Knowledge › Encyclopedic | Free | None | JSON | Unlimited | Live |
WiktionaryWikimedia's collaborative dictionary: word definitions, etymologies, and translations by page title. Data & Knowledge › Dictionaries | Free | None | JSON | Unlimited | Live |
Wizard WorldFan-curated Harry Potter data: houses, elixirs, spells, wizards, and ingredients. Data & Knowledge › Books | None | JSON | Unlimited | Live | |
WolframAlphaComputational answer engine returning direct answers, data, and visualizations for math and factual queries. Data & Knowledge › Encyclopedic | Freemium | API key | <100/day | Live | |
Wolne LekturyTexts, audiobooks and metadata for Polish public-domain literature, browsable by author, epoch and genre. Data & Knowledge › Books | Free | None | JSON | Unlimited | Live |
WordnikEnglish word definitions, synonyms, examples and audio pronunciations from five dictionaries. Data & Knowledge › Dictionaries | Freemium | API key | JSON | 1k–10k/day | Live |
WordsAPIDefinitions, synonyms, antonyms, rhymes and word relationships for over 150,000 English words. Data & Knowledge › Dictionaries | Freemium | API key | JSON | 1k–10k/day | Live |
7Timer!FreeLive
GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing.
None · JSON
Unlimited
no machine-readable spec
Amanah SunnahFreeLive
Quran verses, hadith from 8 classical collections, tafsir, and narrator biographies with grading data.
API key · JSON
Unlimited
no machine-readable spec
An API of Ice And FireFreeLive
Characters, houses, and books from A Song of Ice and Fire and the Game of Thrones TV series.
None · JSON
10k+/day
no machine-readable spec
API ColombiaLive
Colombia reference data: departments, cities, tourist sites, airports, presidents and more.
None · JSON
Unlimited
OpenAPI spec
Art Institute of ChicagoFreeLive
Museum collection data for 130,000+ artworks — artists, mediums, dates, and IIIF images.
None · JSON
10k+/day
no machine-readable spec
AstronomyAPIFreeLive
Sun, Moon and planet positions and events for any place and date, plus rendered star charts and moon images.
API key · JSON
Unlimited
no machine-readable spec
Bhagavad Gita teluguLive
Bhagavad Gita verses by chapter/verse with Telugu, English, Spanish or Odia translation and commentary.
None · JSON
Unlimited
OpenAPI spec
Big Book APIFreemiumLive
Semantic search, filtering, sorting, and recommendations across millions of books.
API key · JSON
<100/day
no machine-readable spec
Black History FactsLive
Approved, user-submitted Black history facts, searchable by tag or person or served at random.
API key · JSON
—
OpenAPI spec
BootprintFreeLive
Returns a random image and fact about a celestial object like Mars, Jupiter or the Moon.
None · JSON
Unlimited
llms.txt
Cat FactsLive
Returns random cat trivia and breed facts, one endpoint, no key required.
None · JSON
Unlimited
no machine-readable spec
Cat FactsFreeLive
Random cat trivia facts from a keyless, community-sourced JSON endpoint.
None · JSON
Unlimited
no machine-readable spec
Chinese Text ProjectFreemiumLive
Full texts and metadata for pre-modern Chinese philosophy, history and literature works.
API key · JSON
—
no machine-readable spec
Chronicling AmericaFreeLive
Searchable full text and metadata for millions of digitized historic US newspaper pages.
None · JSON
—
no machine-readable spec
CodeCogs Equation EditorFreemiumLive
Renders LaTeX equations as PNG, SVG, GIF, EMF, or PDF images from a plain URL.
None · Binary
1k–10k/day
no machine-readable spec
College ROIFreeLive
30-year net present value and lifetime ROI for 500 US colleges and 134 majors, from IPEDS/FREOPP/BEA data.
None · JSON
Unlimited
MCP server · llms.txt
College ScorecardFreeLive
U.S. college and university data: costs, admissions, graduation rates, student outcomes, by school or program.
API key · JSON
10k+/day
no machine-readable spec
DatamuseFreeLive
Finds words matching meaning, sound, spelling pattern or related-word constraints for language tools.
None · JSON
10k+/day
no machine-readable spec
DiceBearFreeLive
Generates deterministic SVG avatars from a seed string, with 60+ art styles to pick from.
None · XML
Unlimited
llms.txt
DiceBearLive
Generates deterministic SVG or PNG avatars from a seed string, across dozens of styles.
None · Binary
Unlimited
llms.txt
Disney APIFreeLive
Lists Disney characters with their films, shows and games, each linked to its Disney Fandom source.
None · JSON
Unlimited
no machine-readable spec
DistrictAPIFreemiumLive
Looks up US school districts and schools by address, with enrollment, spending and boundary data.
API key · JSON
<100/day
OpenAPI spec · MCP server · llms.txt
Dog APIFreeLive
Dog breed characteristics, photos, breed groups, and random facts, no key needed.
None · JSON
Unlimited
llms.txt
Dog FactsDeprecated
Returns random or indexed dog trivia facts from a small static dataset.
None · JSON
Unlimited
no machine-readable spec
Dog FactsFreeLive
Random dog facts, breed data, and breed images from an open-source hobby project.
None · JSON
10k+/day
no machine-readable spec
DogsFreeLive
Random dog photos by breed, sourced from the Stanford Dogs Dataset, no key needed.
None · JSON
Unlimited
no machine-readable spec
English Random WordsFreeDown
Random English words with definitions and pronunciations; also covers six other languages.
None · JSON
—
no machine-readable spec
Free Dictionary APIFreeDown
English word definitions, phonetics, parts of speech, examples and synonyms, no key needed.
None · JSON
Unlimited
no machine-readable spec
FruityviceFreeLive
Botanical family, genus, and per-100g nutrition data (calories, sugar, protein) for common fruits.
None · JSON
Unlimited
no machine-readable spec
Google Books APIDegraded
Searches Google's book catalog for metadata, previews and availability by title, author or ISBN.
API key · JSON
—
no machine-readable spec
GutendexFreeDown
Searchable metadata for 79,000+ Project Gutenberg ebooks: titles, authors, subjects and download links.
None · JSON
Unlimited
no machine-readable spec
Harvard Art MuseumsFreeLive
Harvard Art Museums' collection data: objects, artists, exhibitions, images, refreshed daily.
API key · JSON
1k–10k/day
no machine-readable spec
HebcalFreeLive
Converts Gregorian/Hebrew dates and returns Jewish holidays, Shabbat times, and Torah readings.
None · JSON
10k+/day
OpenAPI spec
HolidaysFreemiumLive
Public holidays and observances for 250+ countries and 3,600+ states/provinces, in 100+ languages.
API key · JSON
—
no machine-readable spec
Hyrule Compendium APIFreeLive
Items, creatures, and locations from The Legend of Zelda: Breath of the Wild and Tears of the Kingdom.
None · JSON
Unlimited
no machine-readable spec
icanhazdadjokeFreeLive
Serves a large library of dad jokes as random, by ID, as a Slack message, an image, or via search.
None · JSON
Unlimited
no machine-readable spec
iDigBioLive
Search millions of digitized natural history museum specimen records by taxon, locality and collector.
None · JSON
Unlimited
no machine-readable spec
ISRO APIFreeLive
Reference data on ISRO's launched spacecraft, launchers, customer satellites and centres.
None · JSON
Unlimited
no machine-readable spec
ITISFreeLive
US government taxonomic database of scientific and common names, hierarchy and classification for species.
None · JSON
Unlimited
no machine-readable spec
IUCN Red ListUntested
Conservation status and extinction-risk data for assessed animal and plant species worldwide.
API key · JSON
—
no machine-readable spec
MeowFactsLive
Random cat facts by GET request, with count, id, and 13+ language options.
None · JSON
Unlimited
no machine-readable spec
Merriam-WebsterFreemiumLive
Word definitions, etymology, audio pronunciation and thesaurus data from Merriam-Webster's reference works.
API key · JSON
1k–10k/day
no machine-readable spec
Metropolitan Museum of Art Collection APIFreeLive
Metadata and images for 470,000+ Met Museum artworks, CC0-licensed, no key required.
None · JSON
Unlimited
no machine-readable spec
NASA Open APIsFreeDegraded
NASA's own gateway to astronomy picture of the day, Mars rover photos, asteroid and Earth imagery data.
API key · JSON
10k+/day
OpenAPI spec
National Park ServiceFreeLive
US national park details, alerts, campgrounds, visitor centers, events and photos, keyed by park code.
API key · JSON
10k+/day
OpenAPI spec
NewtonFreeLive
Computes math expressions: simplify, factor, derive, integrate, zeroes, trig functions.
None · JSON
Unlimited
no machine-readable spec
Nobel Prize APIFreeLive
Structured records of every Nobel Prize and laureate since 1901, including bios and citations.
None · JSON
Unlimited
OpenAPI spec
NoctuaSkyLive
Looks up stars, planets and deep-sky objects by name; powers the Stellarium Web planetarium.
None · JSON
—
OpenAPI spec
Numbers API (Math.Tools)PaidLive
Answers number-theory questions (prime, palindrome, factors), converts bases and spells numbers out.
API key · JSON
—
OpenAPI spec · llms.txt
Official Joke APILive
Random general, knock-knock, programming, and dad jokes as setup/punchline JSON pairs.
None · JSON
Unlimited
OpenAPI spec
Open LibraryFreeLive
Book, edition, author and cover data crowdsourced by the Internet Archive; free lookups by ISBN or title.
None · JSON
10k+/day
no machine-readable spec
Open ScholarshipsFreeLive
Free, CC-BY-licensed directory of US scholarships and student aid, currently covering Nevada.
None · JSON
Unlimited
no machine-readable spec
Oxford Dictionaries APILive
Definitions, pronunciations, synonyms and translations from Oxford's dictionary data, by word lookup.
API key · JSON
—
OpenAPI spec
PlaceDogFreeLive
Serves dog photos sized by URL path, useful as design and layout placeholders
None · Binary
Unlimited
no machine-readable spec
PoetryDBFreeLive
Searches a fixed collection of public-domain poems by author, title, or line, returning JSON.
None · JSON
Unlimited
no machine-readable spec
PokéAPIFreeLive
Detailed structured data on Pokémon species, moves, items, types and games from every generation.
None · JSON
Unlimited
no machine-readable spec
PotterAPIFreeLive
Harry Potter books, characters, houses and spells, in six languages, with images.
None · JSON
Unlimited
no machine-readable spec
PublicDataHubFreeLive
US school, hospital and federal agency figures as JSON/CSV, each one sourced and dated.
None · JSON
Unlimited
OpenAPI spec · llms.txt
PurgoMalumFreeLive
Detects and censors profanity/obscenity in text, including leetspeak substitutions, keyless.
None · JSON
Unlimited
no machine-readable spec
QuizAPIFreemiumLive
REST API for creating, generating, and embedding quizzes with AI-generated questions.
API key · JSON
<100/day
llms.txt
QuizBaseFreemiumLive
Multilingual trivia questions, deduped from 11 open datasets, each tagged with its source license.
API key · JSON
100–1k/day
OpenAPI spec · MCP server · llms.txt
Quran APIFreeLive
Full Quran text plus 440+ translations in 90+ languages, served as static JSON, no key needed.
None · JSON
Unlimited
no machine-readable spec
RandomDuckFreeLive
Random duck photos and GIFs, plus a JSON endpoint and per-image lookup by number.
None · JSON
Unlimited
no machine-readable spec
REST CountriesFreemiumLive
Names, ISO codes, flags, currencies, languages, borders and current leaders for 250+ countries.
API key · JSON
<100/day
llms.txt
Scholar SidekickFreemiumLive
Resolves DOI, PMID, ISBN and arXiv IDs into formatted citations, exports, and fabrication/retraction checks.
None · JSON
<100/day
OpenAPI spec · llms.txt
SefariaFreeLive
Jewish text library API: Torah, Talmud and commentary text, versions, and cross-reference links.
None · JSON
Unlimited
OpenAPI spec · llms.txt
Semantic ScholarFreemiumDegraded
Search and retrieve papers, authors and citation graphs across 200M+ scholarly works.
API key · JSON
—
OpenAPI spec
Smithsonian Open AccessFreeDegraded
Search and metadata for 11M+ CC0-licensed Smithsonian museum and archive collection records.
API key · JSON
—
no machine-readable spec
Solar System OpenDataFreeLive
Physical and orbital data for planets, moons, dwarf planets and asteroids in the solar system.
API key · JSON
—
OpenAPI spec
Sudoku100FreeLive
Generates random or difficulty-picked Sudoku puzzle images (PNG/SVG/WebP) with unique solutions.
None · Binary
Unlimited
llms.txt
Sunrise SunsetFreeLive
Sunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call.
None · JSON
Unlimited
no machine-readable spec
SWAPIFreeLive
Structured data on Star Wars people, planets, starships, vehicles, species and films.
None · JSON
Unlimited
no machine-readable spec
SWAPI.techLive
Star Wars reference data: people, planets, films, species, starships, and vehicles.
None · JSON
Unlimited
no machine-readable spec
The Cat APIFreemiumLive
Random cat images and breed facts, searchable by breed or image type.
API key · JSON
100–1k/day
no machine-readable spec
TrefleFreeLive
Around a million plant records: taxonomy, common names, distribution, images, edibility and growth traits.
API key · JSON
10k+/day
no machine-readable spec
UniDbFreemiumLive
UK university and course data (demographics, ratings, popularity, value) from HESA and government statistics.
API key · JSON
—
no machine-readable spec
USGS Earthquake CatalogFreeLive
Searchable global earthquake catalog by time, area, depth and magnitude, plus minute-updated GeoJSON feeds.
None · JSON
Unlimited
no machine-readable spec
WikidataFreeLive
Structured facts and relationships about people, places and concepts from Wikimedia's public knowledge base.
None · JSON
Unlimited
no machine-readable spec
WikipediaFreeLive
Full-text article content, search, metadata and page history from Wikipedia and other wikis.
None · JSON
Unlimited
no machine-readable spec
WiktionaryFreeLive
Wikimedia's collaborative dictionary: word definitions, etymologies, and translations by page title.
None · JSON
Unlimited
no machine-readable spec
Wizard WorldLive
Fan-curated Harry Potter data: houses, elixirs, spells, wizards, and ingredients.
None · JSON
Unlimited
OpenAPI spec
WolframAlphaFreemiumLive
Computational answer engine returning direct answers, data, and visualizations for math and factual queries.
API key ·
<100/day
OpenAPI spec
Wolne LekturyFreeLive
Texts, audiobooks and metadata for Polish public-domain literature, browsable by author, epoch and genre.
None · JSON
Unlimited
no machine-readable spec
WordnikFreemiumLive
English word definitions, synonyms, examples and audio pronunciations from five dictionaries.
API key · JSON
1k–10k/day
OpenAPI spec
WordsAPIFreemiumLive
Definitions, synonyms, antonyms, rhymes and word relationships for over 150,000 English words.
API key · JSON
1k–10k/day
no machine-readable spec
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