ZEC price from Gemini

price_worker.ex

defmodule Zcex.PriceWorker do
  use GenServer

  def start_link(args) do
    GenServer.start_link(__MODULE__, args, name: __MODULE__)
  end

  def init(state) do
    schedule_price_fetch()
    {:ok, state}
  end

  def schedule_price_fetch do
    Process.send_after(self(), :price_fetch, 30000)
  end

  def handle_info(:price_fetch, state) do
    price = zec_price()
    IO.inspect("Current Zcash price is $#{price}")
    schedule_price_fetch()
    {:noreply, Map.put(state, :zec, price)}
  end

  defp zec_price do
    "https://api.gemini.com/v2/ticker/zecusd"
    |> HTTPoison.get!()
    |> Map.get(:body)
    |> Poison.decode!()
    |> Map.get("bid")
  end
end