Where does dYdX liquidity come from?

Could you please elaborate on the sources of liquidity for dYdX? I'm curious to know where the exchange's trading pairs derive their funding from. Are these primarily from retail investors, institutional investors, or perhaps a combination of both? Additionally, does dYdX have any partnerships or agreements with other exchanges or liquidity providers that contribute to its overall liquidity? Understanding the liquidity sources is crucial for traders to assess the exchange's reliability and trading efficiency. Thank you for your insights.