curl --request POST \
  --url https://api.iotools.cloud/v1/tool/percentage-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "type-1",
  "type1A": "16",
  "type1B": "20"
}
'

{
  "tool": "percentage-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": "80%",
    "summary": "16 out of 20 is 80%",
    "formula": "16 ÷ 20 × 100 = 80%"
  },
  "credits_used": 3,
  "credits_remaining": null
}