Encyclopedic
Every listing carries the same fields in the same order. Counts beside each filter update as you narrow.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
Get Started with Web3Bilingual Web3 lesson index, glossary lookups, search, and role-based learning paths, with source citations. Data & Knowledge › Encyclopedic | Free | None | JSON | Unlimited | 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 |
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 |
WolframAlphaComputational answer engine returning direct answers, data, and visualizations for math and factual queries. Data & Knowledge › Encyclopedic | Freemium | API key | <100/day | Live |
Get Started with Web3FreeLive
Bilingual Web3 lesson index, glossary lookups, search, and role-based learning paths, with source citations.
None · JSON
Unlimited
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
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
WolframAlphaFreemiumLive
Computational answer engine returning direct answers, data, and visualizations for math and factual queries.
API key ·
<100/day
OpenAPI spec
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