> For the complete documentation index, see [llms.txt](https://docs.stake.link/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stake.link/core-staking-contracts/stakingallowance.md).

# Staking Allowance

SDL is a staking allowance token which enables stakers to earn a percentage of protocol rewards and grants stakers the right to priority staking access over non SDL holders.

## ERC20 Functions

All standard ERC20 functions are implemented for `StakingAllowance`

## Write Functions

### mint

Mints tokens to an account

```solidity
function mint(address _account, uint256 _amount) public
```

#### Parameters

| Name      | Type    | Description              |
| --------- | ------- | ------------------------ |
| \_account | address | Address to mint to       |
| \_amount  | uint256 | Amount of tokens to mint |

### mintToContract

Mints tokens to a contract on behalf of an account via ERC677

```solidity
function mintToContract(address _contract, address _account, uint256 _amount, bytes _calldata) public
```

#### Parameters

| Name       | Type    | Description                           |
| ---------- | ------- | ------------------------------------- |
| \_contract | address | Address of contract to send tokens to |
| \_account  | address | Address to mint to                    |
| \_amount   | uint256 | Amount of tokens to mint              |
| \_calldata | bytes   |                                       |

### burn

Burns tokens from the sender

```solidity
function burn(uint256 _amount) public
```

#### Parameters

| Name     | Type    | Description              |
| -------- | ------- | ------------------------ |
| \_amount | uint256 | Amount of tokens to burn |

### burnFrom

Burns `_amount` tokens from `_account`, deducting from the sender's allowance

```solidity
function burnFrom(address account, uint256 amount) public
```

#### Parameters

| Name      | Type    | Description              |
| --------- | ------- | ------------------------ |
| \_account | address | Address to burn from     |
| \_amount  | uint256 | Amount of tokens to burn |

### transferAndCall

Transfers tokens to an address and calls `onTokenTransfer` with additional data if the recipient is a contract

```solidity
function transferAndCall(address _to, uint256 _value, bytes _data) external returns (bool)
```

#### Parameters

| Name    | Type    | Description                       |
| ------- | ------- | --------------------------------- |
| \_to    | address | Address to send the tokens to     |
| \_value | uint256 | Value of token transfer           |
| \_data  | bytes   | Calldata included in the transfer |

### transferAndCallWithSender

Similar to `transferAndCall` but allows the caller to specify a custom sender (used to mint allowance on behalf of an address and send to a contract fallback)

```solidity
function transferAndCallWithSender(address _sender, address _to, uint256 _value, bytes _data) private returns (bool)
```

#### Parameters

| Name     | Type    | Description                                                                   |
| -------- | ------- | ----------------------------------------------------------------------------- |
| \_sender | address | Specified sender of the tokens, the party who 'receives' them into a contract |
| \_to     | address | Contract address to send the tokens to                                        |
| \_value  | uint256 | Value of token transfer                                                       |
| \_data   | bytes   | Calldata included in the transfer                                             |