curl --request GET \
  --url https://prediction-markets-api.dflow.net/api/v1/series \
  --header 'x-api-key: <api-key>'

{
  "series": [
    {
      "additionalProhibitions": [
        "<string>"
      ],
      "category": "<string>",
      "contractTermsUrl": "<string>",
      "contractUrl": "<string>",
      "feeMultiplier": 123,
      "feeType": "<string>",
      "frequency": "<string>",
      "productMetadata": "<unknown>",
      "settlementSources": [
        {
          "name": "<string>",
          "url": "<string>"
        }
      ],
      "tags": [
        "<string>"
      ],
      "ticker": "<string>",
      "title": "<string>"
    }
  ]
}