Settings - API URL

Careful! Do not modify this unless you know what you are doing!

As you probably know, the way ShortPixel Adaptive Images (SPAI) works is it edits the URLs of your images on-the-fly, when your visitor loads the page (How does ShortPixel Adaptive Images work?). It does that because the optimized images are served from our CDN. These URLs look like this: https://cdn.shortpixel.ai/spai/q_lossy+w_794+to_webp+ret_img/https://www.example.com/wp-content/uploads/2018/06/IMG_0169-1.jpg 

The API URL is the first part of the URL (https://cdn.shortpixel.ai/spai ), and it basically tells SPAI where to look for the optimized images. If you decide you want to use a different CDN to deliver the optimized images, you'll have to change this field. For more information about this, check this article.