Very little. You need a smartphone and an email address, and you can sign up with Apple, Google, or email.
Your phone does need to support passkeys, since that is how you sign in and approve payments. That means a screen lock set up on the device, and Android 9 or later. Some third-party password managers need Android 14 or later.
To use features like virtual accounts, deposits, and withdrawals, you will also need to complete identity verification (KYC), but you can create your account first.