curl --request GET \
  --url https://api.example.com/api/supply-chain/v1/get-shipping-rates

{
  "indices": [
    {
      "indexId": "<string>",
      "name": "<string>",
      "currentValue": 123,
      "previousValue": 123,
      "changePct": 123,
      "unit": "<string>",
      "history": [
        {
          "date": "<string>",
          "value": 123
        }
      ],
      "spikeAlert": true
    }
  ],
  "fetchedAt": "<string>",
  "upstreamUnavailable": true
}