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Chinese Text Project vs Crossref Metadata Search

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

APIChinese Text ProjectNEW—Crossref Metadata SearchNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedOpen Crossref metadata (much is CC0)
Free tierFree (higher limits with a free API key)Free, no key (public pool)
Rate limitFair-use; raised with an API key5 requests/second, 1 concurrent (public pool, per X-Rate-Limit headers)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chinese Text Project vs Crossref Metadata Search: common questions

Which is more reliable, Chinese Text Project or Crossref Metadata Search?

On our scheduled checks, Crossref Metadata Search leads on measured uptime — Chinese Text Project at —% versus Crossref Metadata Search 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 Chinese Text Project and Crossref Metadata Search need an API key?

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

Can I call Chinese Text Project and Crossref Metadata Search from the browser?

Yes — both Chinese Text Project and Crossref Metadata Search send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Chinese Text Project and Crossref Metadata Search free for commercial use?

Chinese Text Project has unclear commercial terms, and Crossref Metadata Search 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.