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Is CycleCalcs API down?

Current status, daily uptime history and troubleshooting for the CycleCalcs API (Science & Math).

No, CycleCalcs is up

CycleCalcs answered our last daily check (Oct 24, 2026, 12:25 UTC) in 714 ms with HTTP 200.

Checking CycleCalcs now…

Sending a request from our server.

CycleCalcs API uptime history

30 days agoLatest check
Uptime
2 checks so far
Last check
Oct 24, 2026, 12:25 UTC
Response
714 ms · HTTP 200
Last up
Now

We check CycleCalcs's listed URL (https://www.cyclecalcs.com/api.html) once a day. History started when CycleCalcs was first checked, so new entries show fewer than 30 days.

CycleCalcs API not working for you?

  1. A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header.
  2. If it works from one network but not another, check firewalls, VPNs and regional blocks.
  3. Check the provider's documentation, status page or social accounts for planned maintenance or a changed endpoint.

Science & Math APIs up at their last check

  1. 1GBIF logo

    GBIF API

    Online · 115 ms

    Global Biodiversity Information Facility. A free science & math API by gbif.org.

    • No API key needed
    • Fast: 115 ms response
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  2. 2Macrostrat logo

    Macrostrat API

    Online · 694 ms

    Geologic maps, rock columns and stratigraphy data.

    • No API key needed
    • Returns JSON at its URL
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  3. 3Chempirical logo

    Chempirical API

    Online · 533 ms

    Chemical compounds with physical data, reactions and substructure search.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  4. 4Europe PMC logo

    Europe PMC API

    Online · 118 ms

    Life-science literature search with abstracts, citations and full-text links.

    • No API key needed
    • Fast: 118 ms response
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  5. 5iNaturalist logo

    iNaturalist API

    Online · 1121 ms

    Citizen-science wildlife observations with species identification and mapping.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS

Compare all CycleCalcs alternatives · APIs down right now

CycleCalcs API status FAQ

Is CycleCalcs API down right now?

CycleCalcs answered our last daily check (Oct 24, 2026, 12:25 UTC) in 714 ms with HTTP 200. This page also runs a live check from our server when you open it, so you can see whether CycleCalcs is responding at this moment.

How do you check whether CycleCalcs API is up?

Once a day our checker requests CycleCalcs's listed URL (https://www.cyclecalcs.com/api.html) 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 CycleCalcs API is down?

Free Science & Math APIs that were up at their last check include GBIF, Macrostrat, Chempirical. See the full list of CycleCalcs alternatives for a comparison.

Why does CycleCalcs 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 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.