curl --request POST \
  --url https://api.iotools.cloud/v1/tool/first-n-digits-of-e-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "digitCount": "20"
}
'

{
  "tool": "first-n-digits-of-e-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "eValue": "2.7182818284590452353",
    "digitFrequencyTable": [
      {
        "digit": "0",
        "count": "1",
        "percentage": "5.00%"
      },
      {
        "digit": "1",
        "count": "2",
        "percentage": "10.00%"
      },
      {
        "digit": "2",
        "count": "4",
        "percentage": "20.00%"
      },
      {
        "digit": "3",
        "count": "2",
        "percentage": "10.00%"
      },
      {
        "digit": "4",
        "count": "2",
        "percentage": "10.00%"
      },
      {
        "digit": "5",
        "count": "3",
        "percentage": "15.00%"
      },
      {
        "digit": "6",
        "count": "0",
        "percentage": "0.00%"
      },
      {
        "digit": "7",
        "count": "1",
        "percentage": "5.00%"
      },
      {
        "digit": "8",
        "count": "4",
        "percentage": "20.00%"
      },
      {
        "digit": "9",
        "count": "1",
        "percentage": "5.00%"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}