curl --request POST \
  --url https://api.iotools.cloud/v1/tool/coffee-brew-ratio-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "pour-over",
  "strength": "standard",
  "solveFrom": "water",
  "amount": "350",
  "waterUnit": "ml"
}
'

{
  "tool": "coffee-brew-ratio-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": "Use 21.9 g coffee with 350 mL water (1:16) for about 306 mL brewed.",
    "breakdown": [
      {
        "item": "Brew method",
        "value": "Pour-over (V60, Kalita)"
      },
      {
        "item": "Ratio (coffee : water)",
        "value": "1:16"
      },
      {
        "item": "Coffee",
        "value": "21.9 g · 0.77 oz · 4.4 tbsp"
      },
      {
        "item": "Water",
        "value": "350 mL · 11.8 fl oz"
      },
      {
        "item": "Estimated brewed coffee",
        "value": "306 mL · 10.4 fl oz"
      },
      {
        "item": "Grind size",
        "value": "Medium-fine"
      },
      {
        "item": "Water temperature",
        "value": "92–96 °C (198–205 °F)"
      },
      {
        "item": "Brew time",
        "value": "2:30–3:30 min"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}