curl --request GET \
  --url https://api.struct.to/v1/polymarket/order-book/market

[
  {
    "ts": 123,
    "position_id": "<string>",
    "condition_id": "<string>",
    "bids": [
      {
        "p": "<string>",
        "s": "<string>"
      }
    ],
    "asks": [
      {
        "p": "<string>",
        "s": "<string>"
      }
    ],
    "hash": "<string>",
    "best_bid": 123,
    "best_ask": 123,
    "mid_price": 123,
    "spread": 123,
    "bid_liquidity_usd": 123,
    "ask_liquidity_usd": 123,
    "bid_levels": 123,
    "ask_levels": 123
  }
]