# SFrxETHOracle

## SFrxETHOracle

This oracle fetches the price of sfrxETH

## Solidity API

#### SFRXETH\_FRAX\_ORACLE

Address of SfrxEthFraxOracle

```solidity
contract ISfrxEthFraxOracle SFRXETH_FRAX_ORACLE
```

***

#### SFRXETH

Address of sfrxETH

```solidity
address SFRXETH
```

***

#### maxAllowedPriceDifference

Maximum allowed price difference

```solidity
uint256 maxAllowedPriceDifference
```

***

#### constructor

Constructor for the implementation contract.

```solidity
constructor(address _sfrxEthFraxOracle, address _sfrxETH) public
```

**❌ Errors**

* ZeroAddressNotAllowed is thrown when `_sfrxEthFraxOracle` or `_sfrxETH` are the zero address

***

#### initialize

Sets the contracts required to fetch prices

```solidity
function initialize(address _accessControlManager, uint256 _maxAllowedPriceDifference) external
```

**Parameters**

| Name                        | Type    | Description                                    |
| --------------------------- | ------- | ---------------------------------------------- |
| \_accessControlManager      | address | Address of the access control manager contract |
| \_maxAllowedPriceDifference | uint256 | Maximum allowed price difference               |

**❌ Errors**

* ZeroValueNotAllowed is thrown if `_maxAllowedPriceDifference` is zero

***

#### setMaxAllowedPriceDifference

Sets the maximum allowed price difference

```solidity
function setMaxAllowedPriceDifference(uint256 _maxAllowedPriceDifference) external
```

**Parameters**

| Name                        | Type    | Description                      |
| --------------------------- | ------- | -------------------------------- |
| \_maxAllowedPriceDifference | uint256 | Maximum allowed price difference |

**❌ Errors**

* ZeroValueNotAllowed is thrown if `_maxAllowedPriceDifference` is zero

***

#### getPrice

Fetches the USD price of sfrxETH

```solidity
function getPrice(address asset) external view returns (uint256)
```

**Parameters**

| Name  | Type    | Description                  |
| ----- | ------- | ---------------------------- |
| asset | address | Address of the sfrxETH token |

**Return Values**

| Name | Type    | Description                    |
| ---- | ------- | ------------------------------ |
| \[0] | uint256 | price The price scaled by 1e18 |

**❌ Errors**

* InvalidTokenAddress is thrown when the `asset` is not the sfrxETH token (`SFRXETH`)
* BadPriceData is thrown if the `SFRXETH_FRAX_ORACLE` oracle informs it has bad data
* ZeroValueNotAllowed is thrown if the prices (low or high, in USD) are zero
* PriceDifferenceExceeded is thrown if priceHigh/priceLow is greater than `maxAllowedPriceDifference`

***


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