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Crossref Metadata Search vs Wiktionary

Same instrument, two spec sheets — measured, not claimed.

APICrossref Metadata SearchNEW—WiktionaryNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesyes
Data licenseOpen Crossref metadata (much is CC0)Content under CC BY-SA 4.0 / GFDL
Free tierFree, no key (public pool)Free — public MediaWiki action API
Rate limit5 requests/second, 1 concurrent (public pool, per X-Rate-Limit headers)No hard published cap; Wikimedia User-Agent policy and request-etiquette apply
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crossref Metadata Search vs Wiktionary: common questions

Which is more reliable, Crossref Metadata Search or Wiktionary?

On our scheduled checks, Wiktionary leads on measured uptime — Crossref Metadata Search at —% versus Wiktionary at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Crossref Metadata Search and Wiktionary need an API key?

Neither needs a paid key — Crossref Metadata Search is callable with no signup, and Wiktionary is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Crossref Metadata Search and Wiktionary from the browser?

Only Crossref Metadata Search is browser-friendly — it returns CORS headers over HTTPS. Wiktionary needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Crossref Metadata Search and Wiktionary free for commercial use?

Crossref Metadata Search allows commercial use on its free tier, and Wiktionary allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.