curl --request GET \
  --url https://api.alphafeed.org/v1/depth \
  --header 'X-API-Key: <api-key>'

{
  "data": {
    "ask_prices": [
      123
    ],
    "ask_volumes": [
      123
    ],
    "bid_prices": [
      123
    ],
    "bid_volumes": [
      123
    ],
    "symbol": "<string>",
    "timestamp": 123
  }
}