curl -X GET 'https://app.memorylake.ai/openapi/memorylake/admin/v1/billing/credit-balance' \
  -H 'Authorization: Bearer sk_xxxxxx'

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "available_tokens": 1200000,
    "billing_mode": "standard",
    "breakdown": [
      {
        "source": "subscription",
        "tokens": 1200000,
        "expires_at": 1760000000
      }
    ],
    "unlimited": false
  }
}