curl --request GET \
  --url https://api.rivermarkets.com/v1/orderbooks/{river_id} \
  --header 'x-api-key: <api-key>'

{
  "status": "ok",
  "orderbook": {
    "bids": [
      {
        "price": 123,
        "qty": 123
      }
    ],
    "asks": [
      {
        "price": 123,
        "qty": 123
      }
    ],
    "river_id": 123,
    "custom_asset_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "best_bid_price": 123,
    "best_ask_price": 123,
    "exchange_timestamp": "2023-11-07T05:31:56Z"
  },
  "message": "<string>"
}