Generate random image by url

I have an API with the endpoints:

• api/image/1 Returns me the image 1
• api/image/random Gives me a random image

Whenever I make a call for a random image, like 5 times on 1 webpage, each time it's the same image. It's a little bit like https://picsum.photos/seed/picsum/200/300...

I would like to have a random image, each time. Even if I call for a random image 10 times on 1 webpage. Is there a way that this is possible?