In the repository you will find Magento 2 module called Abhinay_RandomCat.
It's a simple JSON API with only one endpoint: https://randomcatapi.commerce.lingaro.dev/
It is protected by API key. To be authorized you must pass api_key GET parameter to the endpoint. The key that you may use is 5up3rc0nf1d3n714llp455w0rdf0rc47s. Consider this key as a secret.
As a response for request to this API you will get simple JSON object with just one attribute called "url", eg. {"url": "http://supercats.com/randomkitty123.jpg"}.
The API is heavily loaded, so from time to time (approximately 25% of all requests) it will not respond with HTTP status 200.
Collection of cats photos used by the API is a little bit outdated, so from time to time (approximately 30% of successfull requests) it will return URL pointing to a 404 page.