curl --request GET \
  --url https://hub-api.neynar.com/v1/storageLimitsByFid \
  --header 'x-api-key: <api-key>'

{
  "limits": [
    {
      "storeType": "STORE_TYPE_CASTS",
      "limit": 123
    }
  ],
  "units": 1,
  "unitDetails": {
    "unitType": "UnitTypeLegacy",
    "unitSize": 1
  },
  "tier_subscriptions": [
    {
      "tier_type": "Pro",
      "expires_at": 1749611663
    }
  ]
}