You cannot use just any broker; it must be one of MW's partner brokers. At present, you can only use BlackBull Markets, hereafter referred to as BBM or BB. If you already have an account with one of the MW partner brokers, that account will need to be moved under MW.

Regarding crypto exchanges ("Exchanges"), only Liquidity One (L1) is currently supported as this exchange has certain unique features. Here it is currently possible to use an account that you have already opened separately with Liquidity One if you have one. It may be possible in the future that this type of account must also be opened via MW's customer portal.