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

{
  "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
}