curl --request POST \
  --url https://api.iotools.cloud/v1/tool/pump-affinity-laws-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "speed1": "1450",
  "speed2": "1750",
  "flow1": "100",
  "head1": "30",
  "power1": "12"
}
'

{
  "tool": "pump-affinity-laws-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "quantity": "Flow",
        "current": "100",
        "new": "120.69",
        "ratio": "1.2069"
      },
      {
        "quantity": "Head",
        "current": "30",
        "new": "43.698",
        "ratio": "1.4566"
      },
      {
        "quantity": "Power",
        "current": "12",
        "new": "21.0956",
        "ratio": "1.75796"
      }
    ],
    "summary": "Flow 100 → 120.69, Head 30 → 43.698, Power 12 → 21.0956"
  },
  "credits_used": 5,
  "credits_remaining": null
}