curl --request GET \
  --url 'https://api.glider.fi/v1/portfolio/port_abc123/performance?timeWindow=30d' \
  --header 'X-API-KEY: your_api_key_here'

{
  "success": true,
  "data": {
    "portfolioId": "port_abc123",
    "timeWindow": "30d",
    "startValue": "950.00",
    "currentValue": "1053.75",
    "change": "103.75",
    "changePercent": "10.92",
    "startDate": "2023-04-21T13:45:12.345Z",
    "data": [
      {
        "timestamp": "2023-04-21T13:45:12.345Z",
        "value": "950.00"
      },
      {
        "timestamp": "2023-04-28T13:45:12.345Z",
        "value": "975.50"
      },
      {
        "timestamp": "2023-05-05T13:45:12.345Z",
        "value": "990.25"
      },
      {
        "timestamp": "2023-05-12T13:45:12.345Z",
        "value": "1020.15"
      },
      {
        "timestamp": "2023-05-19T13:45:12.345Z",
        "value": "1045.30"
      },
      {
        "timestamp": "2023-05-21T13:45:12.345Z",
        "value": "1053.75"
      }
    ]
  },
  "correlationId": "corr_abc123",
  "requestId": "req_xyz789",
  "timestamp": "2023-05-21T13:45:12.345Z"
}