# Curve Token V2

> The implementation for a Curve Token V2 may be viewed on 
[GitHub](https://github.com/curvefi/curve-contract/blob/master/contracts/tokens/CurveTokenV2.vy).

The implementation for a Curve Token V2 may be viewed on 
[GitHub](https://github.com/curvefi/curve-contract/blob/master/contracts/tokens/CurveTokenV2.vy).

:::note

Compared to Curve Token v1, the following changes have been made to the API:

- `minter` attribute is public and therefore a `minter` getter has been generated
- `name` and `symbol` attributes can be set via `set_name`
- `mint` method returns `bool`
- `burnFrom` method returns `bool`
- `burn` method has been removed

:::

:::warning

For Curve LP Tokens V1 and V2, non-zero to non-zero approvals are prohibited. Instead, after every non-zero approval, 
the allowance for the spender must be reset to `0`.

:::

### `CurveToken.minter`

::::description[`CurveToken.minter() → address: view`]

Getter for the address of the `minter` of the token.

<SourceCode>

```vyper hl_lines="1 11"
minter: public(address)

@external
def __init__(_name: String[64], _symbol: String[32], _decimals: uint256, _supply: uint256):
    init_supply: uint256 = _supply * 10 **_decimals
    self.name = _name
    self.symbol = _symbol
    self.decimals = _decimals
    self.balanceOf[msg.sender] = init_supply
    self.total_supply = init_supply
    self.minter = msg.sender
    log Transfer(ZERO_ADDRESS, msg.sender, init_supply)
```

</SourceCode>

<Example>

```shell
>>> lp_token.minter()
""
```

</Example>

::::

### `CurveToken.set_name`

::::description[`CurveToken.set_name(_name: String[64], _symbol: String[32])`]

Set the name and symbol of the token. This method can only be called by minter.

| Input      | Type   | Description |
| ----------- | -------| ----|
| `name` | `String[64]` | New name of token |
| `symbol` | `String[32]` | New symbol of token |

<SourceCode>

```vyper hl_lines="1 11"
@external
def set_name(_name: String[64], _symbol: String[32]):
    assert Curve(self.minter).owner() == msg.sender
    self.name = _name
    self.symbol = _symbol
```

</SourceCode>

<Example>

```shell
>>> lp_token.minter()
todo: ""
```

</Example>

::::

### `CurveToken.mint`

::::description[`CurveToken.mint(_to: address, _value: uint256) → bool`]

Mint an amount of the token and assign it to an account. This encapsulates the modification of balances such that 
the proper events are emitted. Returns `True` if not reverted.

| Input      | Type   | Description |
| ----------- | -------| ----|
| `_to` | `address` | Receiver of minted tokens |
| `_value` | `uint256` | Amount of tokens minted |

Emits: <mark style={{backgroundColor: '#FFD580', color: 'black'}}>Transfer</mark>

<SourceCode>

```vyper
@external
def mint(_to: address, _value: uint256) -> bool:
    """
    @dev Mint an amount of the token and assigns it to an account.
         This encapsulates the modification of balances such that the
         proper events are emitted.
    @param _to The account that will receive the created tokens.
    @param _value The amount that will be created.
    """
    assert msg.sender == self.minter
    assert _to != ZERO_ADDRESS
    self.total_supply += _value
    self.balanceOf[_to] += _value
    log Transfer(ZERO_ADDRESS, _to, _value)
    return True
```

</SourceCode>

<Example>

```shell
>>> lp_token.mint()
todo: ""
```

</Example>

::::

### `CurveToken.burnFrom`

::::description[`CurveToken.burnFrom(_to: address, _value: uint256) → bool`]

Burn an amount of the token from a given account. Returns `True` if not reverted.

| Input      | Type   | Description |
| ----------- | -------| ----|
| `_to` | `address` | Account whose tokens will be burned |
| `_value` | `uint256` | Amount that will be burned |

Emits: <mark style={{backgroundColor: '#FFD580', color: 'black'}}>Transfer</mark>

<SourceCode>

```vyper
@external
def burnFrom(_to: address, _value: uint256) -> bool:
    """
    @dev Burn an amount of the token from a given account.
    @param _to The account whose tokens will be burned.
    @param _value The amount that will be burned.
    """
    assert msg.sender == self.minter
    assert _to != ZERO_ADDRESS

    self.total_supply -= _value
    self.balanceOf[_to] -= _value
    log Transfer(_to, ZERO_ADDRESS, _value)

    return True
```

</SourceCode>

<Example>

```shell
>>> lp_token.burnFrom()
todo: ""
```

</Example>

::::