curl --request POST \
  --url https://api.iotools.cloud/v1/tool/aquarium-heater-wattage-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "tankVolume": "20",
  "volumeUnit": "gal",
  "targetTemp": "78",
  "roomTemp": "68",
  "tempUnit": "f"
}
'

{
  "tool": "aquarium-heater-wattage-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Tank Volume",
        "value": "75.7 L (20.0 gal)"
      },
      {
        "metric": "Temperature Difference",
        "value": "10.0°F (5.6°C)"
      },
      {
        "metric": "Base Wattage Needed",
        "value": "48 W"
      },
      {
        "metric": "Recommended Wattage (with 20% safety margin)",
        "value": "58 W"
      },
      {
        "metric": "Recommended Heater Size",
        "value": "75 W (single heater)"
      }
    ],
    "options": [
      {
        "option": "50 W",
        "assessment": "Undersized — won't reliably reach your target temperature"
      },
      {
        "option": "75 W",
        "assessment": "Recommended — covers the needed wattage with a safety margin"
      },
      {
        "option": "100 W",
        "assessment": "Oversized — works, but costs more and risks overshooting temperature"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}