curl --request POST \
  --url https://api.iotools.cloud/v1/tool/frequency-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "value": "1000",
  "fromUnit": "hertz",
  "precision": "4"
}
'

{
  "tool": "frequency-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "table": [
      {
        "unit": "Hertz (Hz)",
        "value": "1000"
      },
      {
        "unit": "Kilohertz (kHz)",
        "value": "1"
      },
      {
        "unit": "Megahertz (MHz)",
        "value": "0.001"
      },
      {
        "unit": "Gigahertz (GHz)",
        "value": "0"
      },
      {
        "unit": "Terahertz (THz)",
        "value": "0"
      },
      {
        "unit": "Rotations per Minute (RPM)",
        "value": "60000"
      },
      {
        "unit": "Beats per Minute (BPM)",
        "value": "60000"
      },
      {
        "unit": "Radians per Second (rad/s)",
        "value": "6283.1853"
      },
      {
        "unit": "Degrees per Second (°/s)",
        "value": "360000"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}