name() :: String.t()

t() :: %ExDeribit.Instrument{
  base_currency: String.t(),
  contract_size: pos_integer(),
  creation_timestamp: pos_integer(),
  expiration_timestamp: pos_integer(),
  instrument_name: name(),
  is_active: boolean(),
  kind: String.t(),
  leverage: number(),
  maker_commission: number(),
  min_trade_amount: number(),
  option_type: String.t() | nil,
  quote_currency: String.t(),
  settlement_period: String.t(),
  strike: number() | nil,
  taker_commission: number(),
  tick_size: number()
}