# LiquidityGauge
When an LP token is whitelisted on `LendingLedger`, a `LiquidityGauge` wrapper is automatically created. This simple wrapper calls `sync_ledger` in the `_afterTokenTransfer` hook to ensure eligible LP positions are continuously tracked by the protocol.
### Depositing
To deposit LP tokens into a wrapper, call the `depositUnderlying(uint256 _amount)` method. The wrapper must be approved to spend the underlying token.
**ethers.js**
```
await LiquidityGauge.depositUnderlying(10000000000000000000) // Deposit 10 LP tokens
```
**foundry**
```
cast send --ledger 0x... "depositUnderlying(uint256)" 10000000000000000000
```
### Withdrawing
To withdraw LP tokens from a wrapper, call the `withdrawUnderlying(uint256 _amount)` method.
**ethers.js**
```
await LiquidityGauge.withdrawUnderlying(10000000000000000000) // Withdraw 10 LP tokens
```
**foundry**
```
cast send --ledger 0x... "withdrawUnderlying(uint256)" 10000000000000000000
```
---
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