IUCN
IUCN Red List of Threatened Species
- Authentication
- API Key
- HTTPS
- No
- CORS
- No
- Category
- Animals
- Data source
- public-apis
- Documentation / URL
- http://apiv3.iucnredlist.org/api/v3/docs
Overview
IUCN provides Red List data — token-based.
⚠️ Status (verified 2026-08): the API returned HTTP 403 (Cloudflare challenge page) — automated clients are blocked. Verify from your network before relying on it.
What it provides
curl "https://apiv3.iucnredlist.org/api/v3/species/page/0?token=YOUR_TOKEN"Notes
- Red List species data.
- 403 Cloudflare challenge (verified).
FAQ
Is IUCN free? Token-based with a free tier per the docs.
Why 403? Cloudflare blocks automated clients (verified) — try a browser.
What does it return? Red List data.