# Price Provider

## Methods

### changeActive

```solidity
function changeActive(address token, bool active) external nonpayable
```

#### Parameters

| Name   | Type    | Description |
| ------ | ------- | ----------- |
| token  | address | undefined   |
| active | bool    | undefined   |

### getEvaluation

```solidity
function getEvaluation(address token, uint256 tokenAmount) external view returns (uint256 evaluation)
```

#### Parameters

| Name        | Type    | Description |
| ----------- | ------- | ----------- |
| token       | address | undefined   |
| tokenAmount | uint256 | undefined   |

#### Returns

| Name       | Type    | Description |
| ---------- | ------- | ----------- |
| evaluation | uint256 | undefined   |

### getEvaluationSigned

```solidity
function getEvaluationSigned(address token, uint256 tokenAmount, uint256 priceMantissa, uint256 validTo, bytes signature) external view returns (uint256 evaluation)
```

*return the evaluation in $ of `tokenAmount` with signed price*

#### Parameters

| Name          | Type    | Description                                                                             |
| ------------- | ------- | --------------------------------------------------------------------------------------- |
| token         | address | the address of token to get evaluation in $                                             |
| tokenAmount   | uint256 | the amount of token to get evaluation. Amount is scaled by 10 in power token decimals   |
| priceMantissa | uint256 | the price multiplied by priceDecimals. The dimension of priceMantissa should be $/token |
| validTo       | uint256 | the timestamp in seconds, when price is gonna be not valid.                             |
| signature     | bytes   | the ECDSA sign on eliptic curve secp256k1.                                              |

#### Returns

| Name       | Type    | Description |
| ---------- | ------- | ----------- |
| evaluation | uint256 | undefined   |

### getPrice

```solidity
function getPrice(address token) external view returns (uint256 priceMantissa, uint8 priceDecimals)
```

#### Parameters

| Name  | Type    | Description |
| ----- | ------- | ----------- |
| token | address | undefined   |

#### Returns

| Name          | Type    | Description |
| ------------- | ------- | ----------- |
| priceMantissa | uint256 | undefined   |
| priceDecimals | uint8   | undefined   |

### getPriceDecimals

```solidity
function getPriceDecimals() external view returns (uint8 priceDecimals)
```

#### Returns

| Name          | Type  | Description |
| ------------- | ----- | ----------- |
| priceDecimals | uint8 | undefined   |

### getPriceSigned

```solidity
function getPriceSigned(address token, uint256 priceMantissa, uint256 validTo, bytes signature) external view returns (uint256 _priceMantissa, uint8 _priceDecimals)
```

#### Parameters

| Name          | Type    | Description |
| ------------- | ------- | ----------- |
| token         | address | undefined   |
| priceMantissa | uint256 | undefined   |
| validTo       | uint256 | undefined   |
| signature     | bytes   | undefined   |

#### Returns

| Name            | Type    | Description |
| --------------- | ------- | ----------- |
| \_priceMantissa | uint256 | undefined   |
| \_priceDecimals | uint8   | undefined   |

### isActive

```solidity
function isActive(address token) external view returns (bool)
```

#### Parameters

| Name  | Type    | Description |
| ----- | ------- | ----------- |
| token | address | undefined   |

#### Returns

| Name | Type | Description |
| ---- | ---- | ----------- |
| \_0  | bool | undefined   |

### isListed

```solidity
function isListed(address token) external view returns (bool)
```

#### Parameters

| Name  | Type    | Description |
| ----- | ------- | ----------- |
| token | address | undefined   |

#### Returns

| Name | Type | Description |
| ---- | ---- | ----------- |
| \_0  | bool | undefined   |