Cataas

Cataas (Cat as a Service) is a free API that delivers random cat images, memes, and even animated GIFs. It's perfect for pet-themed apps, chatbots, and entertainment platforms. You can customize images with overlay text (e.g., “hello world” on a cat’s face), use filters like grayscale or blur, and fetch results in JSON or image format. No authentication is required, and it’s widely used in hobby projects, learning platforms, and lightweight frontends.