curl --request GET \
  --url https://github.com/openpx-trade/openpx/v1/orderbook/fetch_orderbook_stats

{
  "ask_depth": 123,
  "asset_id": "<string>",
  "bid_depth": 123,
  "openpx_ts": "2023-11-07T05:31:56Z",
  "best_ask": 123,
  "best_bid": 123,
  "exchange_ts": "2023-11-07T05:31:56Z",
  "imbalance": 123,
  "mid": 123,
  "spread_bps": 123,
  "weighted_mid": 123
}