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

{
  "tool": "speed-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "result": "",
    "table": [
      {
        "unit": "Meter per Second (m/s)",
        "value": "0.2778"
      },
      {
        "unit": "Kilometer per Hour (km/h)",
        "value": "1"
      },
      {
        "unit": "Mile per Hour (mph)",
        "value": "0.6214"
      },
      {
        "unit": "Foot per Second (ft/s)",
        "value": "0.9113"
      },
      {
        "unit": "Knot (kn)",
        "value": "0.54"
      },
      {
        "unit": "Kilometer per Minute (km/min)",
        "value": "0.0167"
      },
      {
        "unit": "Centimeter per Second (cm/s)",
        "value": "27.7778"
      },
      {
        "unit": "Millimeter per Second (mm/s)",
        "value": "277.7778"
      },
      {
        "unit": "Mile per Minute (mi/min)",
        "value": "0.0104"
      },
      {
        "unit": "Inch per Second (in/s)",
        "value": "10.9361"
      },
      {
        "unit": "Micrometer per Second (µm/s)",
        "value": "277777.7778"
      },
      {
        "unit": "Nanometer per Second (nm/s)",
        "value": "277777777.7778"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}