curl --request GET \
  --url https://api.arbiterapi.com/v1/markets/{market_id}/orderbook \
  --header 'X-API-Key: <api-key>'

{
  "market_id": "<string>",
  "bids": [
    {
      "price": 123,
      "size": 123,
      "platform": "polymarket"
    }
  ],
  "asks": [
    {
      "price": 123,
      "size": 123,
      "platform": "polymarket"
    }
  ],
  "spread": 123,
  "mid_price": 123,
  "timestamp_ms": 123
}