curl --request GET \
  --url https://api.example.com/orderbook/{marketId}/quote

{
  "marketId": "<string>",
  "side": "buy",
  "requestedSize": 123,
  "filledSize": 123,
  "avgPrice": 123,
  "totalCost": 123,
  "slippage": 123,
  "fills": [
    {
      "venue": "<string>",
      "size": 123,
      "avgPrice": 123,
      "cost": 123
    }
  ]
}