Open credit account

To interact with Gearbox, a user must open a credit account. During the opening, the credit account borrows funds in underlying from the pool and transfers collateral from the user.

Example:

Opening credit account

The trader borrows 90 ETH and provides 10 ETH of their own funds. After opening an account, its total balance is 100 ETH. The trader can then use the credit account to interact with various protocols, but has no access to funds.

Note: It is possible to provide collateral in an asset different from the underlying, however, this can only be done through openCreditAccountMulticall.

Borrowing limits and other restrictions

Each CreditFacade imposes limits on the borrowed amount for a single CA, set by the DAO. Those limits can retrieved by using a CreditFacade getter CreditFacade.limits(), which returns a tuple of (minAmount, maxAmount).

It is also forbidden to open and close a Credit Account in the same block, and reducing the debt immediately after opening the account.

Opening a CreditAccount on behalf of another user (onBehalfOf != msg.sender) is only possible of account transfer allowance from the account opener to the user is set to true.

Methods

To open a Credit Account, two CreditFacade functions can be used:

Open credit account

function openCreditAccount(
    uint256 amount,
    address onBehalfOf,
    uint16 leverageFactor,
    uint16 referralCode
) external payable;

Parameter	Description
amount	Borrower's initial funds
onBehalfOf	The address for which the Credit Account is being opened
leverageFactor	The amount of leverage to take on. The borrowed amount is computed as `amount * leverageFactor / 100`, hence `leverageFactor = 100` corresponds to 2x leverage.
referralCode	Referral code, which is used for potential partner rewards. 0 if no referral code provided.

Open credit account with a multicall

function openCreditAccountMulticall(
    uint256 borrowedAmount,
    address onBehalfOf,
    MultiCall[] calldata calls,
    uint16 referralCode
) external payable;

Parameter	Description
borrowedAmount	Amount of the underlying to borrow.
onBehalfOf	The address for which the Credit Account is being opened.
calls	The array of calls to execute immediately after opening an account.
referralCode	Referral code, which is used for potential partner rewards. 0 if no referral code provided.

NB! While collateral is automatically transferred from the msg.sender during openCreditAccount, for openCreditAccountMulticall that is no longer the case, and collateral has to be transferred within a multicall by adding a call to CreditFacade.addCollateral() to the calls array.

Degen mode

Degen Mode is a special restricted mode in the Credit Facade, designed for testing in production. If Degen Mode is enabled, opening a credit account requires burning a special NFT from msg.sender. If msg.sender's NFT balance is 0, account opening will fail.

The NFT is not returned after closing or liquidating the account, so each NFT allows to open 1 account only.

The NFTs are distributed by the DAO to well-known traders and builders in the space, in order to test the system with limited exposure of pool funds.

CreditFacade.whitelisted() can be used to determine whether the Credit Facade has Degen Mode enabled. CreditFacade.degenNFT() can be used to retrieve the NFT address.

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