curl --request GET \
  --url https://api.barker.money/api/partner/products/{slug}/fee-stats \
  --header 'X-Api-Key: <api-key>'

{
  "success": true,
  "data": [
    {
      "date": "2026-05-04",
      "engine_total_assets": "1245678.123456",
      "daily_yield_assets": "208.95",
      "daily_partner_fee_earned": "16.71",
      "cumulative_partner_fee_earned": "934.27",
      "net_apy_for_user": "0.0490"
    }
  ]
}