curl --request POST \
  --url https://api.iotools.cloud/v1/tool/pet-age-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "petAge": "2",
  "petSpecies": "dog",
  "dogSize": "medium"
}
'

{
  "tool": "pet-age-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": [
      {
        "metric": "Pet Age",
        "value": "2 years"
      },
      {
        "metric": "Species",
        "value": "Dog (Medium breed)"
      },
      {
        "metric": "Human-Equivalent Age",
        "value": "42.1 years"
      },
      {
        "metric": "Life Stage",
        "value": "Adult"
      },
      {
        "metric": "Formula Used",
        "value": "2019 epigenetic-clock formula: 16 x ln(age) + 31, adjusted for breed size"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}