curl --request GET \
  --url https://api.platform.dakota.xyz/customers/sub-client-summary \
  --header 'x-api-key: <api-key>'

{
  "data": [
    {
      "sub_client_id": "1NFHrqBHb3cTfLVkFSGmHZqdDPi",
      "sub_client_name": "Partner Corp",
      "customer_count": 15
    }
  ]
}