curl --request GET \
  --url https://api.blink15.com/book/unified

{
  "asks": [
    {
      "direct_size": "<string>",
      "implied_size": "<string>",
      "is_implied": true,
      "order_count": 1,
      "price": "<string>",
      "size": "<string>",
      "implied_source": "<string>"
    }
  ],
  "asset_id": "<string>",
  "bids": [
    {
      "direct_size": "<string>",
      "implied_size": "<string>",
      "is_implied": true,
      "order_count": 1,
      "price": "<string>",
      "size": "<string>",
      "implied_source": "<string>"
    }
  ],
  "market": "<string>",
  "timestamp": "<string>",
  "best_ask": "<string>",
  "best_bid": "<string>",
  "spread": "<string>"
}