curl --request POST \
  --url https://api.iotools.cloud/v1/tool/bandwidth-download-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "fileSize": "1",
  "fileSizeUnit": "GB",
  "speed": "100",
  "speedUnit": "Mbps"
}
'

{
  "tool": "bandwidth-download-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": [
      {
        "metric": "Download time",
        "value": "1 minute 20 seconds"
      },
      {
        "metric": "Total seconds",
        "value": "80"
      },
      {
        "metric": "Effective transfer rate",
        "value": "12.5 MB/s"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}