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Crossref Metadata Search vs Random Word API

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

APICrossref Metadata SearchHEALTHY94Random Word APIHEALTHY94
Uptime · 30d
Uptime · 90d98.3%98.3%
Uptime · 30d100%95.0%
P50 · ms290144
P95 · ms26832022
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseOpen Crossref metadata (much is CC0)Unverified
Free tierFree, no key (public pool)Free — limits not published
Rate limit5 requests/second, 1 concurrent (public pool, per X-Rate-Limit headers)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crossref Metadata Search vs Random Word API: common questions

Which is more reliable, Crossref Metadata Search or Random Word API?

Both are neck-and-neck — Crossref Metadata Search and Random Word API each measure 98.3% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Crossref Metadata Search or Random Word API?

Random Word API has the lower median latency in our checks — Crossref Metadata Search responds in 290 ms versus Random Word API at 144 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Crossref Metadata Search and Random Word API need an API key?

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

Can I call Crossref Metadata Search and Random Word API from the browser?

Yes — both Crossref Metadata Search and Random Word API 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 Crossref Metadata Search and Random Word API free for commercial use?

Crossref Metadata Search allows commercial use on its free tier, and Random Word API has unclear commercial terms. 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.