curl --request POST \
  --url https://api.iotools.cloud/v1/tool/volume-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "value": "1",
  "fromUnit": "liter",
  "toUnit": "all",
  "precision": "4"
}
'

{
  "tool": "volume-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "result": "",
    "table": [
      {
        "unit": "Milliliter (mL)",
        "value": "1000"
      },
      {
        "unit": "Liter (L)",
        "value": "1"
      },
      {
        "unit": "Cubic Centimeter (cm³)",
        "value": "1000"
      },
      {
        "unit": "Cubic Meter (m³)",
        "value": "0.001"
      },
      {
        "unit": "US Teaspoon (US tsp)",
        "value": "202.8842"
      },
      {
        "unit": "US Tablespoon (US tbsp)",
        "value": "67.6279"
      },
      {
        "unit": "US Fluid Ounce (US fl oz)",
        "value": "33.8141"
      },
      {
        "unit": "US Cup (US cup)",
        "value": "4.2268"
      },
      {
        "unit": "US Pint (US pt)",
        "value": "2.1134"
      },
      {
        "unit": "US Quart (US qt)",
        "value": "1.0567"
      },
      {
        "unit": "US Gallon (US gal)",
        "value": "0.2642"
      },
      {
        "unit": "Imperial Fluid Ounce (Imp fl oz)",
        "value": "35.195"
      },
      {
        "unit": "Imperial Pint (Imp pt)",
        "value": "1.7598"
      },
      {
        "unit": "Imperial Gallon (Imp gal)",
        "value": "0.22"
      },
      {
        "unit": "Cubic Inch (in³)",
        "value": "61.0237"
      },
      {
        "unit": "Cubic Foot (ft³)",
        "value": "0.0353"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}