curl --request POST \
  --url https://api.hypereth.io/v1/info/l2Book \
  --header 'Content-Type: application/json' \
  --data '{
  "type": "l2Book",
  "coin": "BTC",
  "nSigFigs": 5
}'

{
  "levels": [
    [
      [
        {
          "px": "43250.5",
          "sz": "2.5",
          "n": 3
        }
      ]
    ]
  ],
  "time": 123
}