> For the complete documentation index, see [llms.txt](https://docs.dexe.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dexe.network/contract-interfaces/gov-contracts/erc721/multipliers/iabstracterc721multiplier.md).

# IAbstractERC721Multiplier

## Interface Description

License: MIT

##

```solidity
interface IAbstractERC721Multiplier is IERC721EnumerableUpgradeable
```

This is the special NFT contract which behaves like a coupon that can be locked to receive certain extra rewards proportional to the rewards in the Governance pool contract

## Structs info

### NftInfo

```solidity
struct NftInfo {
	uint256 multiplier;
	uint64 duration;
	uint64 mintedAt;
}
```

This struct holds NFT Multiplier parameters

Parameters:

| Name       | Type    | Description                             |
| ---------- | ------- | --------------------------------------- |
| multiplier | uint256 | the basic rewards multiplier            |
| duration   | uint64  | the time for which an nft can be locked |
| mintedAt   | uint64  | the time nft was minter                 |

## Functions info

### lock (0xdd467064)

```solidity
function lock(uint256 tokenId) external
```

This function is used to lock an nft (enable corresponding basic rewards multiplier). Only one NFT for each address can be locked at the same time

Parameters:

| Name    | Type    | Description                    |
| ------- | ------- | ------------------------------ |
| tokenId | uint256 | the id of the nft to be locked |

### unlock (0xa69df4b5)

```solidity
function unlock() external
```

This function is used to unlock an nft (disable corresponding basic rewards multiplier)

### getExtraRewards (0x1429683b)

```solidity
function getExtraRewards(
    address whose,
    uint256 rewards
) external view returns (uint256)
```

This function is used to calculate extra rewards

Parameters:

| Name    | Type    | Description                                             |
| ------- | ------- | ------------------------------------------------------- |
| whose   | address | the address of the user who is to receive extra rewards |
| rewards | uint256 | basic rewards to be multiplied                          |

Return values:

| Name | Type    | Description   |
| ---- | ------- | ------------- |
| \[0] | uint256 | extra rewards |

### isLocked (0xf6aacfb1)

```solidity
function isLocked(uint256 tokenId) external view returns (bool)
```

This function is used to check whether the passed nft id is locked

Parameters:

| Name    | Type    | Description       |
| ------- | ------- | ----------------- |
| tokenId | uint256 | the id of the nft |

Return values:

| Name | Type | Description                                                        |
| ---- | ---- | ------------------------------------------------------------------ |
| \[0] | bool | false if nft has expired or hasn't yet been locked, otherwise true |


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