curl --request POST \
  --url https://api.iotools.cloud/v1/tool/eta-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "startTime": "2026-07-13T09:00",
  "totalUnits": "100",
  "perNumber": "3",
  "perUnit": "m",
  "breakTime": "0",
  "breakTimeUnit": "m",
  "bufferTimePercentage": "0",
  "workingHoursOnly": "",
  "excludeWeekends": ""
}
'

{
  "tool": "eta-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "finishTime": "Monday, July 13, 2026 at 2:00 PM",
    "totalDuration": "5 hours"
  },
  "credits_used": 3,
  "credits_remaining": null
}