curl --request POST \
  --url https://api.iotools.cloud/v1/tool/recipe-scale-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "originalServings": "4",
  "targetServings": "6",
  "recipeText": "2 cups flour\nPreheat oven to 350F",
  "roundingMode": "fractions"
}
'

{
  "tool": "recipe-scale-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "scaledRecipe": "3 cups flour\nPreheat oven to 350F",
    "summary": "Scaling 4 → 6 servings (×1.5) · 1 ingredient line scaled."
  },
  "credits_used": 3,
  "credits_remaining": null
}