Vaulta operates on an account-based system that uses a unique resource-staking model for its operations. This means that to create a new Vaulta account, you need to pay a fee in EOS which is automatically staked to provide your new account with its initial essential resources: RAM, CPU, and NET.
You can generate a registration QR code and have an existing Vaulta user scan it to cover this resource cost for you. For a complete guide, please check out: How to Create a Vaulta Account.
Please note that this registration fee is collected directly by the Vaulta network and is used exclusively for resource staking. imToken does not charge any additional fees on top of this.