curl --request POST \
  --url https://api.iotools.cloud/v1/tool/weighted-grade-average-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "assignments": "Homework, 90, 20\nMidterm, 85, 30\nFinal Exam, 78, 50",
  "letterScale": "standard"
}
'

{
  "tool": "weighted-grade-average-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": "82.5% (B)",
    "breakdown": [
      {
        "assignment": "Homework",
        "grade": "90%",
        "weight": "20%",
        "weighted-points": "18"
      },
      {
        "assignment": "Midterm",
        "grade": "85%",
        "weight": "30%",
        "weighted-points": "25.5"
      },
      {
        "assignment": "Final Exam",
        "grade": "78%",
        "weight": "50%",
        "weighted-points": "39"
      }
    ],
    "summary": "Weight check\n  Total weight: 100%\n  Graded: 100% (3 assignments)\n  OK Weights sum to 100%."
  },
  "credits_used": 3,
  "credits_remaining": null
}