curl --request GET \
  --url https://gateway.polymarket.us/v1/markets/{slug}/bbo

{
  "marketData": {
    "marketSlug": "<string>",
    "currentPx": {
      "value": 123.45,
      "currency": "<string>"
    },
    "lastTradePx": {
      "value": 123.45,
      "currency": "<string>"
    },
    "settlementPx": {
      "value": 123.45,
      "currency": "<string>"
    },
    "sharesTraded": "<string>",
    "openInterest": "<string>",
    "bestAsk": {
      "value": 123.45,
      "currency": "<string>"
    },
    "bestBid": {
      "value": 123.45,
      "currency": "<string>"
    },
    "askDepth": 123,
    "bidDepth": 123,
    "lastPriceSample": {
      "longPx": {
        "value": 123.45,
        "currency": "<string>"
      },
      "shortPx": {
        "value": 123.45,
        "currency": "<string>"
      },
      "ts": "2023-11-07T05:31:56Z"
    }
  }
}