# set\_fees

An entrypoint that setups interface fee, swap fee, and auction fee that applies in time of each [***swap***](/smart-contracts/dex-2.0/dexcore-contract/entrypoints-overview/dex-entrypoints/swap.md) or [***flash\_swap***](/smart-contracts/dex-2.0/dexcore-contract/entrypoints-overview/dex-entrypoints/swap.md)**.** Also it setups a reward for withdrawing auction fee that applies in time of calling [***withdraw\_auction\_fee***](/smart-contracts/dex-2.0/dexcore-contract/entrypoints-overview/dex-entrypoints/withdraw_auction_fee.md) entrypoint by any user.

### Call parameters

```pascaligo
type fees_t             is [@layout:comb] record [
  interface_fee           : nat;
  swap_fee                : nat;
  auction_fee             : nat;
  withdraw_fee_reward     : nat;
]
```

<table><thead><tr><th width="229">Field</th><th width="150">Type</th><th width="199.77716643741405">Hint</th><th>Description</th></tr></thead><tbody><tr><td>interface_fee</td><td>nat</td><td>Float value multiplied by 1e+18</td><td>Fee that goes to referrers or UI/UX providers</td></tr><tr><td>swap_fee</td><td>nat</td><td>Float value multiplied by 1e+18</td><td>Fee that goes to the liquidity pool (for liquidity providers)</td></tr><tr><td>auction_fee</td><td>nat</td><td>Float value multiplied by 1e+18</td><td>Fee that goes to the <a href="/pages/Tfsg5Ntqa1tvgeBH1v4L">Auction</a> contract</td></tr><tr><td>withdraw_fee_reward</td><td>nat</td><td>Float value multiplied by 1e+18</td><td>The % of the rewards that will be transferred to the transaction sender when he calls <a href="/pages/CpczzXJsvvqiH9Mwcgou"><em><strong>withdraw_auction_fee</strong></em></a> entrypoint</td></tr></tbody></table>

### Usage

{% tabs %}
{% tab title="🌮 Taquito" %}

```javascript
const interfaceFee = 0.05 * 10 ** 18; // 0.05%
const swapFee = 0.05 * 10 ** 18; // 0.05%
const auctionFee = 0.4 * 10 ** 18; // 0.4%
const withdrawFeeReward = 3 * 10 ** 18; // 3%
const dexCoreAddress = "KT1...";
const fees = {
    interface_fee: interfaceFee,
    swap_fee: swapFee,
    auction_fee: auctionFee,
    withdraw_fee_reward: withdrawFeeReward,
};
const dexCore = await tezos.contract.at(dexCoreAddress);
const operation = await dexCore.methodsObject.set_fees(fees).send();

await operation.confirmation();
```

{% endtab %}
{% endtabs %}

### Errors

* `400` - `sender` of the transaction is not current administrator.
* `412` - non payable entrypoint (can't accept TEZ tokens during call of an entrypoint).


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