curl --request POST \
  --url https://api.iotools.cloud/v1/tool/readability-score \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputText": "The cat sat on the mat. The dog ran fast. Sam had a red hat. We go to the park. It was a fun day."
}
'

{
  "tool": "readability-score",
  "tool_version": "1.0.1",
  "outputs": {
    "scores": [
      {
        "metric": "Flesch Reading Ease",
        "score": "100.0",
        "assessment": "Very Easy (Kindergarten equivalent)"
      },
      {
        "metric": "Flesch-Kincaid Grade Level",
        "score": "-1.8",
        "assessment": "Very Easy"
      },
      {
        "metric": "Gunning Fog Index",
        "score": "2.0",
        "assessment": "Very Easy"
      },
      {
        "metric": "SMOG Index",
        "score": "3.1",
        "assessment": "Very Easy"
      },
      {
        "metric": "Coleman-Liau Index",
        "score": "-5.7",
        "assessment": "Very Easy"
      },
      {
        "metric": "Automated Readability Index",
        "score": "-0.7",
        "assessment": "Very Easy"
      }
    ],
    "stats": [
      {
        "metric": "Words",
        "value": "25"
      },
      {
        "metric": "Sentences",
        "value": "5"
      },
      {
        "metric": "Characters",
        "value": "97"
      },
      {
        "metric": "Syllables",
        "value": "25"
      },
      {
        "metric": "Avg words/sentence",
        "value": "5.00"
      },
      {
        "metric": "Avg syllables/word",
        "value": "1.00"
      },
      {
        "metric": "Estimated reading time",
        "value": "Less than 1 min"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}