1. After logging into the main account, sub-accounts can be accessed directly without requiring account credentials.

2. By clicking the sub-account name in the navigation bar or sub-account management page, users can quickly access and switch between the main account and sub-accounts or different sub-accounts.

1. The main account can set or modify trading permissions for sub-accounts, such as contracts, leverage, AMM, and API management.

2. Spot and financial permissions are enabled by default and cannot be changed.

1. Transfer relationship between main and sub-accounts:
Fund transfers for sub-accounts can only be initiated by the main account. Sub-accounts cannot initiate transfers to the main account, meaning that fund management permissions fully belong to the main account.

2. Fund transfers between sub-accounts:
Fund transfers between the spot accounts of two sub-accounts can only be performed by the main account. For example, main account A can transfer funds from the spot account of sub-account B to the spot account of sub-account C through the sub-account management page.

3. Inter-user transfers within sub-accounts:
Sub-accounts only support internal fund transfers from their spot accounts to leveraged, contract, financial, or market-making accounts.

4. Fund transfers for custodied sub-Accounts:
A custodian main account cannot transfer funds for a custodied sub-account. Only the original main account can perform such transfers. Custodied sub-accounts can only perform internal fund transfers.

5. Sub-accounts do not support deposit or withdrawal functions.

1. Each sub-account can create up to 50 API key pairs.

2. Each API key can bind up to 50 IP addresses.

3. Sub-accounts inherit two-factor authentication from the main account and do not require separate binding.

1. Authorization:

Authorization refers to binding a sub-account to another main account to establish a authorized relationship. Once established, the authorized main account can quickly access the authorized sub-account and perform operations and trading, excluding fund management.

2. Authorization relationship model:

Authorization relationships follow a one-to-many model, meaning a sub-account can be simultaneously authorized by up to 5 main accounts.

3. Independence of trading permissions:

Trading permissions of sub-accounts are only applicable to the sub-account itself and are unrelated to the authorized relationship. Any changes to the permissions will be synchronized across all authorized relationships.

4. Trading fees:

The trading fees for sub-accounts are consistent with the original main account and are unrelated to the authorized main account.

5. Main account permissions:

The original main account retains full control over the authorized sub-account, including fund transfers, API creation, establishing new custody relationships, and terminating existing ones.

1. Delegation:

Delegate full trading permissions of your sub-account to a market maker for management, including spot trading, margin trading, futures trading, API management, and other permissions. 

2. Delegation relationship model:

Custody relationships follow a one-to-one model, meaning a sub-account can only be delegated by one market maker account.

3. Trading fees:

When your sub-account is under custody, the trading volume of the sub-account will be credited to the custodian's account for market making. The trading fee rates applied to the custodian will be adopted for the related transactions.

4. Main account permissions:

When your sub-account is under custody, you cannot change the permissions. Permissions can be reclaimed by revoking custody.