curl --request GET \
  --url 'https://api.511.org/transit/operators?api_key='

{
  "Siri": {
    "ServiceDelivery": {
      "ResponseTimestamp": "2026-03-25T00:00:00Z",
      "DataObjectDelivery": {
        "dataObjects": {
          "ResourceFrame": {
            "organisations": {
              "Operator": [
                {
                  "id": "SF",
                  "PrivateCode": "SF",
                  "Name": "San Francisco Municipal Transportation Agency"
                }
              ]
            }
          }
        }
      }
    }
  }
}