How can it be decentralized and I need to deposit money to your BTC address, and therefore trust? Many platforms do not require updating the balance in order to buy or sell.
I haven't tried to link MetaMask wallet, but it seems to be no different from DEX.AG platform.
The number of currencies offered for trading is simple and most are unknown.
Is the only role of BTC in updating the values/Balance?
Brain wallet is non custodial. It is a wallet which is dynamically generate and lives only in your local storage - the storage of the browser.
We do not have access to your private keys at any given moment.
We just use this way of abstraction of public/private key pair to make it more user friendly.
In a week we will release a new update where we will support hardware wallet - ledger if that works for you.
The brain wallet is only suitable for small amounts, but like I said it is secure enough and non-custodial.
We do not have access to your funds.