curl --request POST \
  --url https://api.iotools.cloud/v1/tool/eulers-method-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "functionExpr": "x + y",
  "x0": "0",
  "y0": "1",
  "stepSize": "0.1",
  "numSteps": "5",
  "exactSolution": ""
}
'

{
  "tool": "eulers-method-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": [
      {
        "metric": "Method",
        "value": "Explicit (forward) Euler"
      },
      {
        "metric": "Step size (h)",
        "value": "0.1"
      },
      {
        "metric": "Steps completed",
        "value": "5 of 5"
      },
      {
        "metric": "Final approximation y(0.5)",
        "value": "1.72102"
      }
    ],
    "steps": [
      {
        "n": "0",
        "x": "0",
        "y-euler": "1",
        "f-x-y": "1",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      },
      {
        "n": "1",
        "x": "0.1",
        "y-euler": "1.1",
        "f-x-y": "1.2",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      },
      {
        "n": "2",
        "x": "0.2",
        "y-euler": "1.22",
        "f-x-y": "1.42",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      },
      {
        "n": "3",
        "x": "0.3",
        "y-euler": "1.362",
        "f-x-y": "1.662",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      },
      {
        "n": "4",
        "x": "0.4",
        "y-euler": "1.5282",
        "f-x-y": "1.9282",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      },
      {
        "n": "5",
        "x": "0.5",
        "y-euler": "1.72102",
        "f-x-y": "2.22102",
        "exact-y-x": "-",
        "absolute-error": "-",
        "relative-error": "-"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}