curl --request GET \
  --url https://api.rivermarkets.com/v1/markets/lookup \
  --header 'X-River-Key-Id: <api-key>' \
  --header 'X-River-Signature: <api-key>' \
  --header 'X-River-Timestamp: <api-key>'

{
  "results": [
    {
      "river_id": 123,
      "exchange_value": 123,
      "exchange_name": "<string>",
      "tick_size_price": 123,
      "tick_size_qty": 123,
      "minimum_order_size": 123,
      "neg_risk": true,
      "name": "<string>",
      "ticker": "<string>",
      "token_id_yes": "<string>",
      "token_id_no": "<string>",
      "slug": "<string>",
      "tick_structure": "uniform",
      "expiration_datetime": "<string>",
      "start_datetime": "<string>",
      "neg_risk_id": "<string>",
      "condition_id": "<string>",
      "subtitle": "<string>",
      "description": "<string>",
      "category": "Other",
      "subcategory": "<string>",
      "rank": 123,
      "event_ticker": "<string>",
      "event_title": "<string>",
      "volume": 123,
      "volume_24h": 123,
      "series_ticker": "<string>",
      "image": "<string>",
      "primary_entity_name": "<string>"
    }
  ]
}