# Withdraw

### Querying Redeem Amounts

If you would like your platform to display the amount of underlying tokens the user would receive for redeeming cTokens, you may use the `convertToAsset()` function present in all cToken contracts using the following arguments:

<table><thead><tr><th width="109">Type</th><th width="102">Name</th><th>Description</th></tr></thead><tbody><tr><td>uint256</td><td>tokens</td><td>The number of cToken shares to theoretically convert to underlying assets</td></tr></tbody></table>

Conversely, if you want to let the user choose how much underlying assets to withdraw, you may use the `convertToShares()` function:

<table><thead><tr><th width="109">Type</th><th width="102">Name</th><th>Description</th></tr></thead><tbody><tr><td>uint256</td><td>amount</td><td>The number of underlying tokens to theoretically convert to cTokens</td></tr></tbody></table>

### Withdraw from cTokens (cUSDC example)

To withdraw USDC from cUSDC directly, you may use the `withdraw(assets)` or  `redeem(shares)` functions present in all cToken contracts using the following arguments:

{% hint style="info" %}
Withdrawing/Redeeming does not force collateral removal.
{% endhint %}

<table><thead><tr><th width="114">Type</th><th width="239">Name</th><th>Description</th></tr></thead><tbody><tr><td>uint256</td><td>assets (if withdraw)<br>shares (if redeem)</td><td>The number of assets/shares to withdraw/redeem.</td></tr><tr><td>address</td><td>recipient</td><td>The account who will receive the underlying assets</td></tr></tbody></table>

Below is an example of using `withdraw()`:

```javascript
// Get the cUSDC contract with signer
const cUSDC = new ethers.Contract(ADDRESSES.EUSDC, CTOKEN_ABI, signer);

// Get the amount of shares to redeem from the user's input amount
// userInputAmount being equal to "1000", representing 1000 USDC
// which should be formatted to 1000 * 10^6
var USDCWithdrawAmountFormatted = ethers.utils.parseUnits(userInputAmount, 6);

// Convert the underlying amount to shares
const cUSDCSharesToRedeem = await cUSDC.convertToShares(USDCWithdrawAmountFormatted);

// Redeem cUSDC for USDC
const underlyingRedeemed = await cUSDC.redeem(depositAmount, recipientAddress);
```

Below is an implementation of using `redeem()`, letting the user choose how much underlying to redeem:

```javascript
// Get the cUSDC contract with signer
const cUSDC = new ethers.Contract(ADDRESSES.CUSDC, CTOKEN_ABI, signer);

// Get the amount of shares to redeem from the user's input amount
// userInputAmount being equal to "1000", representing 1000 USDC
// which should be formatted to 1000 * 10^6
var USDCWithdrawAmountFormatted = ethers.utils.parseUnits(userInputAmount, 6);

// Convert the underlying amount to shares
const cUSDCSharesToRedeem = await cUSDC.convertToShares(USDCWithdrawAmountFormatted);

// Redeem cUSDC for USDC
const underlyingRedeemed = await cUSDC.redeem(depositAmount);
```

#### Using redeemFor

If your app requires you to withdraw on users' behalf, you can use the `redeemFor()` function in the cToken contract using the following function arguments:&#x20;

{% hint style="info" %}
Make sure your platforms' address is approved as a delegate. Visit [Plugin Integration](https://docs.curvance.com/cve/developer-docs/quick-start-guides/plugin-integration) for more information.
{% endhint %}

<table><thead><tr><th width="109">Type</th><th width="243">Parameter</th><th>Description</th></tr></thead><tbody><tr><td>uint256</td><td>assets (if withdrawFor)<br>shares (if redeemFor)</td><td>The number of assets/shares to withdraw/redeem.</td></tr><tr><td>address</td><td>recipient</td><td>The account that should receive the underlying assets.</td></tr></tbody></table>

## Withdrawing Collateral

When withdrawing from collateralized cTokens, you have a few choices of functions to call depending on the needs of your platform.

* `redeemCollateral()` - If you would like to redeem cTokens that *are* currently being used as collateral.
* `redeemCollateralFor()` - If you would like to redeem cTokens that are currently being used as collateral, on behalf of a user. Requires the user to delegate your platform.

{% hint style="info" %}
ERC20 approval is not required for redeeming cTokens.
{% endhint %}

{% hint style="danger" %}
Removing collateral should be done with extreme caution. Removing collateral can increase the user's loan to value ratio, which increases the risk of liquidation.
{% endhint %}