{
  "model": "nai-diffusion-4-5-full",
  "operation": "upscale",
  "payload": {
    "image": "https://example.com/source.png",
    "model": "nai-diffusion-5-curated",
    "declared_blur_sigma": 0,
    "width": 512,
    "height": 512,
    "scale": 2
  }
}