curl --request GET \
  --url https://api.agg.market/orderbook/outcome/{outcomeId} \
  --header 'x-app-id: <api-key>'

{
  "venueMarketOutcomeId": "<string>",
  "venueMarketId": "<string>",
  "venue": "<string>",
  "orderbook": {
    "bids": [
      {
        "price": 123,
        "size": 123
      }
    ],
    "asks": [
      {
        "price": 123,
        "size": 123
      }
    ]
  },
  "midpoint": 123,
  "spread": 123,
  "seq": 123,
  "checksum": 123,
  "timestamp": 123
}