curl --request POST \
  --url https://api.iotools.cloud/v1/tool/css-validator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "cssInput": "body {\n  color: #333;\n  margin: 0;\n}\n"
}
'

{
  "tool": "css-validator",
  "tool_version": "1.0.1",
  "outputs": {
    "validationResult": [
      {
        "line": "-",
        "type": "Valid",
        "message": "Valid CSS — no structural issues found"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}