PayTube wallet which is built by zkTube team is a Layer 2 wallet. Metamask, Trust, etc, belong to the Layer 1 wallet.
Compared with this wallet, the PayTube wallet can directly exchange stable currency with legal currency on the second layer, and the currency purchased with legal currency can directly reach L1 and L2.
At the same time, the L1 and L2 layers can also directly sell the currency to obtain legal currency. The advantage of this is that it directly opens up the data interaction between the legal currency and L2, and does not need to go through L1, directly improving the efficiency of capital operation and reducing the user cost.
More info: https://zktube.io/