# - BTCB Lending

## 💡**Deposit BTCB To Get ibBTCB**

![](/files/-Mc9KDazhgK-l-mds5Uo)

**ibBTCB** can be calculated by;

* *CASE 1* : (Total BTCB Deposit Amount) > 0

$$
{Number}\space{of}\space{Token}=\frac{{Deposit}\space{Amount}\*{Total}\space{Token}}{{Total}\space{Liquidity}}
$$

* *CASE 2 :* (Total BTCB - Deposit Amount) ≤ 0

$$
{Number}\space{of}\space{Token}={Deposit}\space{Amount}
$$

**\*Total  Liquidity = Total BTCB Deposited + Cumulative Borrow Interest**

Total ibBTCB token is set based on the first user who deposits this asset. For example, if Bob is the first user who deposits 1 BTCB, then the total ibBTCB token starts with 1 ibBTCB. If Alice then adds 0.5 BTCB then the total liquidity will be  1.5 BTCB, then Alice gets 0.33 ibBTCB (0.5 \* 1 / 1.5).

## 💡**Withdraw ibBTCB to get BTCB**

The number of withdrawal share that can be calculated from the following equation;

$$
{Withdrawal}\space{Share}=\frac{{Withdrawal}\space{Amount}\*{Total}\space{Token}}{{Total}\space {Liquidity}}
$$

![](/files/-McCzleXKv4tBqsj8LnF)

### 📎Total BTCB Deposited (Total Supply)

Can be called '*Total Liquidity*', the total amount of liquidity in each asset pool, calculated as

$$
TotalLiquidity = TotalAvailableLiquidity+TotalBorrows
$$

### 📎Total Debt Issued (Total Borrowing)

Can be called '**Total Borrow Shares**', the total number of shares of Total Borrow for an asset, while **Total Borrows** are the sum of the total borrowed amount and accumulated borrow interest of an asset.

### 📎Current ibBTCB APR

Can be calculated from the following equation

$$
{ibBTCB}\space{APR} = \frac{{Borrow}\space{Interest}\*Utilization}{100}
$$


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