Airwallex allows people to have accounts in multiple currencies. This enables online transactions and deposits into brokers.
Airwallex's main use in this context is for currency conversion and as a conduit. For example, to trade US stocks, an investor might use Interactive Brokers. The investor could deposit USD into interactive brokers, rather than bearing fees and costs exchanging within interactive brokers.
As with any bank account, it is important to ensure that you are comfortable with the bank in which Airwallex keeps your funds.
These are some of my favorite investment tools and apps. I use these tools to improve my investment, get quality data, and analyst information, and monitor and manage my portfolio. I've found them useful; hopefully you will too.