CoinMeta data: According to the selected mainstream platform statistics, the total notional amount of open BTC USDT margin perpetual contracts is 15.487 billion US dollars. The open position volume (OI) measures the notional value of the unclosed contracts and can be used to observe the level of leverage participation, but it does not represent net long or net short positions. This metric does not represent the entire market. Data time: 10-02 10:25 (Beijing time).