curl --request GET \
  --url https://api.yoshi.ai/v1/paper-trading/accounts/{accountId}/holdings \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "holdings": [
      {
        "id": "<string>",
        "security_id": "<string>",
        "symbol": "<string>",
        "name": "<string>",
        "security_type": "<string>",
        "quantity": 123,
        "cost_basis": 123,
        "institution_price": 123,
        "institution_value": 123,
        "as_of": "<string>"
      }
    ]
  },
  "meta": {
    "request_id": "req_a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "timestamp": "2026-04-10T12:00:00.000Z"
  }
}