# Swap

## exact input

For exact input swap, use the `exact_input_swap_entry` function in the router`_v3` module.

```
 public entry fun exact_input_swap_entry(
        user: &signer,
        fee_tier: u8,
        amount_in: u64,
        amount_out_min: u64,
        sqrt_price_limit: u128,
        from_token: Object<Metadata>,
        to_token: Object<Metadata>,
        recipient: address,
        _deadline: u64
    ) {
    ...
    }
```

### Function params

`amount_out_min`: the threshold value of token output.&#x20;

`sqrt_price_limit`: a x64 fixed-point number, indicate price impact limit after swap

`recipient`: output token receiver

## exact output

For exact output swap, use the `exact_output_swap_entry` function in the router`_v3` module.

```
  public entry fun exact_output_swap_entry(
        user: &signer,
        fee_tier: u8,
        amount_in_max: u64,
        amount_out: u64,
        sqrt_price_limit: u128,
        from_token: Object<Metadata>,
        to_token: Object<Metadata>,
        recipient: address,
        _deadline: u64
    ) {
    ...
    }
```

### Function params

`amount_in_max`: the threshold value of token input.&#x20;

`sqrt_price_limit`: a x64 fixed-point number, indicate price impact limit after swap

`recipient`: output token receiver

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