Is Crossref Metadata Search API down?
Current status, daily uptime history and troubleshooting for the Crossref Metadata Search API (Books).
No, Crossref Metadata Search is up
Crossref Metadata Search answered our last daily check (Oct 24, 2026, 12:25 UTC) in 755 ms with HTTP 200.
Checking Crossref Metadata Search now…
Sending a request from our server.
Crossref Metadata Search API uptime history
- Uptime
- 2 checks so far
- Last check
- Oct 24, 2026, 12:25 UTC
- Response
- 755 ms · HTTP 200
- Last up
- Now
We check Crossref Metadata Search's listed URL (https://github.com/CrossRef/rest-api-doc) once a day. History started when Crossref Metadata Search was first checked, so new entries show fewer than 30 days.
Crossref Metadata Search API not working for you?
- A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header.
- If calls fail only in the browser with a CORS error, Crossref Metadata Search may not allow cross-origin requests. Call it from your server instead.
- If it works from one network but not another, check firewalls, VPNs and regional blocks.
- Check the provider's documentation, status page or social accounts for planned maintenance or a changed endpoint.
Books APIs up at their last check
- 1
Greenlit Books API
Online · 1178 msCatalog of practical AI books with search, series, glossary and a claim ledger.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 2
KDP Intelligence API
Online · 1181 msKDP niche demand scores, competition analysis and revenue estimates.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 3
PoetryDB API
Online · 623 msEnables you to get instant data from our vast poetry collection.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 4
Runyankole Bible API
Online · 1069 msFree REST API for the Runyankore-Rukiga Bible — 66 books, 31106 verses.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 5
Thirukkural API
Online · 814 ms1330 Thirukkural poems and explanation in Tamil and English.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
Compare all Crossref Metadata Search alternatives · APIs down right now
Crossref Metadata Search API status FAQ
Is Crossref Metadata Search API down right now?
Crossref Metadata Search answered our last daily check (Oct 24, 2026, 12:25 UTC) in 755 ms with HTTP 200. This page also runs a live check from our server when you open it, so you can see whether Crossref Metadata Search is responding at this moment.
How do you check whether Crossref Metadata Search API is up?
Once a day our checker requests Crossref Metadata Search's listed URL (https://github.com/CrossRef/rest-api-doc) and records whether it answers within 15 seconds. Answers like 401 (needs a key), 403 (blocks bots) or 429 (rate-limited) count as up, because the server responded. The listed URL is often the documentation page, so an API endpoint can occasionally fail while its docs stay up.
What can I use if Crossref Metadata Search API is down?
Free Books APIs that were up at their last check include Greenlit Books, KDP Intelligence, PoetryDB. See the full list of Crossref Metadata Search alternatives for a comparison.
Why does Crossref Metadata Search API work for others but not for me?
A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header. If calls fail only in the browser with a CORS error, Crossref Metadata Search may not allow cross-origin requests. Call it from your server instead. If it works from one network but not another, check firewalls, VPNs and regional blocks.