Is OnlineCompiler API down?
Current status, daily uptime history and troubleshooting for the OnlineCompiler API (Programming).
No, OnlineCompiler is up
OnlineCompiler answered our last daily check (Nov 15, 2026, 13:58 UTC) in 1113 ms with HTTP 200.
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OnlineCompiler API uptime history
- Uptime
- 100% of 10 checks
- Last check
- Nov 15, 2026, 13:58 UTC
- Response
- 1113 ms · HTTP 200
- Last up
- Now
We check OnlineCompiler's listed URL (https://onlinecompiler.io/docs) once a day. History started when OnlineCompiler was first checked, so new entries show fewer than 30 days.
OnlineCompiler API not working for you?
- OnlineCompiler needs an API key. A 401 or 403 usually means a missing, expired or mis-sent credential: check whether it belongs in a header or the query string.
- A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header.
- OnlineCompiler doesn't send CORS headers, so browsers block calls made directly from a web page. 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.
Programming APIs up at their last check
- 1
Mintlify API
Online · 3526 msFor programmatically generating documentation for code.
- 100% uptime (30 days)
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS - 2
Judge0 CE API
Online · 803 msOnline code execution system. A free programming API by Judge0 CE.
- 100% uptime (30 days)
- HTTPS
apiKeyHTTPSCORS ? - 3
Codeforces API
Online · 586 msGet access to Codeforces data.
- 100% uptime (30 days)
- HTTPS
apiKeyHTTPSCORS ? - 4
Hackerearth API
Online · 1557 msFor compiling and running code in several languages.
- 100% uptime (30 days)
- HTTPS
apiKeyHTTPSCORS ? - 5
KONTESTS API
Online · 2032 msFor upcoming and ongoing competitive coding contests.
- No API key needed
- HTTPS
No authHTTPSCORS ?
Compare all OnlineCompiler alternatives · APIs down right now
OnlineCompiler API status FAQ
Is OnlineCompiler API down right now?
OnlineCompiler answered our last daily check (Nov 15, 2026, 13:58 UTC) in 1113 ms with HTTP 200. This page also runs a live check from our server when you open it, so you can see whether OnlineCompiler is responding at this moment.
How do you check whether OnlineCompiler API is up?
Once a day our checker requests OnlineCompiler's listed URL (https://onlinecompiler.io/docs) 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.
How reliable is OnlineCompiler API?
OnlineCompiler answered 100% of our last 10 daily checks. Above 99% is excellent for a free API; below 95% means you should cache responses and keep a fallback ready.
What can I use if OnlineCompiler API is down?
Free Programming APIs that were up at their last check include Mintlify, Judge0 CE, Codeforces. See the full list of OnlineCompiler alternatives for a comparison.
Why does OnlineCompiler API work for others but not for me?
OnlineCompiler needs an API key. A 401 or 403 usually means a missing, expired or mis-sent credential: check whether it belongs in a header or the query string. A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header. OnlineCompiler doesn't send CORS headers, so browsers block calls made directly from a web page. Call it from your server instead.