# IQuoter

Quoter Interface Supports quoting the calculated amounts from exact input or exact output swaps *Developer note: These functions are not marked view because they rely on calling non-view functions and reverting to compute the result. They are also not gas efficient and should not be called on-chain.*

## Functions

### quoteExactInput

`quoteExactInput(bytes,uint256)` external

Returns the amount out received for a given exact input swap without executing the swap

| Name     | Type    | Description                                |
| -------- | ------- | ------------------------------------------ |
| path     | bytes   | The path of the swap, i.e. each token pair |
| amountIn | uint256 | The amount of the first token to swap      |

**Returns:**

| Name      | Type      | Description |
| --------- | --------- | ----------- |
| amountOut | uint256   |             |
| fees      | uint16\[] |             |

### quoteExactInputSingle

`quoteExactInputSingle(address,address,uint256,uint160)` external

Returns the amount out received for a given exact input but for a swap of a single pool

| Name           | Type    | Description                                                     |
| -------------- | ------- | --------------------------------------------------------------- |
| tokenIn        | address | The token being swapped in                                      |
| tokenOut       | address | The token being swapped out                                     |
| amountIn       | uint256 | The desired input amount                                        |
| limitSqrtPrice | uint160 | The price limit of the pool that cannot be exceeded by the swap |

**Returns:**

| Name      | Type    | Description |
| --------- | ------- | ----------- |
| amountOut | uint256 |             |
| fee       | uint16  |             |

### quoteExactOutput

`quoteExactOutput(bytes,uint256)` external

Returns the amount in required for a given exact output swap without executing the swap

| Name      | Type    | Description                                                                        |
| --------- | ------- | ---------------------------------------------------------------------------------- |
| path      | bytes   | The path of the swap, i.e. each token pair. Path must be provided in reverse order |
| amountOut | uint256 | The amount of the last token to receive                                            |

**Returns:**

| Name     | Type      | Description |
| -------- | --------- | ----------- |
| amountIn | uint256   |             |
| fees     | uint16\[] |             |

### quoteExactOutputSingle

`quoteExactOutputSingle(address,address,uint256,uint160)` external

Returns the amount in required to receive the given exact output amount but for a swap of a single pool

| Name           | Type    | Description                                                     |
| -------------- | ------- | --------------------------------------------------------------- |
| tokenIn        | address | The token being swapped in                                      |
| tokenOut       | address | The token being swapped out                                     |
| amountOut      | uint256 | The desired output amount                                       |
| limitSqrtPrice | uint160 | The price limit of the pool that cannot be exceeded by the swap |

**Returns:**

| Name     | Type    | Description |
| -------- | ------- | ----------- |
| amountIn | uint256 |             |
| fee      | uint16  |             |

***


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