candle() :: ExFtx.Candle.t()

market_name() :: String.t()

params() :: %{
  optional(:limit) => pos_integer(),
  optional(:start_time) => pos_integer(),
  optional(:end_time) => pos_integer()
}

resolution() :: non_neg_integer()

result() ::
  {:ok, candle()} | {:error, :not_found | :parse_result_item | String.t()}