curl --request POST \
  --url https://api.iotools.cloud/v1/tool/shoe-clothing-size-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "category": "shoes_men",
  "system": "us",
  "size": "10"
}
'

{
  "tool": "shoe-clothing-size-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "result": [
      {
        "region-system": "US",
        "size": "10"
      },
      {
        "region-system": "UK",
        "size": "9.5"
      },
      {
        "region-system": "EU",
        "size": "43"
      },
      {
        "region-system": "JP / CM",
        "size": "28"
      },
      {
        "region-system": "CN",
        "size": "43"
      }
    ],
    "note": "JP / CM is the foot length in centimeters. CN (Mondopoint) closely tracks EU for adult sizes."
  },
  "credits_used": 3,
  "credits_remaining": null
}