The API is simple. It takes two arguments: A 6-digit hex color, like ff85a9 or 41427a. These can be uppercase or lowercase but must be 6 hex digits. A width and a height in pixels, like 200 by 300. Maximum dimensions are 5000 by 5000; please request larger sizes if you need them. https://singlecolorimage.com/get/33fd8f/400x100