Adoption.
RescueGroups API is a free Animals API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
A modern team knowledge base for your internal documentation, product specs, support answers, meeting notes, onboarding, & more…
Details from userguide.rescuegroups.org.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Random pictures of Shiba Inu, cats or birds
A public service all about Dogs, free to use when making your fancy new App, Website or Service
The RescueGroups API is provided by RescueGroups.org Support Guides (userguide.rescuegroups.org). A modern team knowledge base for your internal documentation, product specs, support answers, meeting notes, onboarding, & more…
Yes. The RescueGroups API is listed in the Animals category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The RescueGroups API requires no authentication, so you can start making requests without signing up.
CORS support for the RescueGroups API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The RescueGroups API is served over HTTPS, so it's safe to use in production.