> For the complete documentation index, see [llms.txt](https://docs.alkemi.network/earn-contracts/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.alkemi.network/earn-contracts/docs/eip20interface.md).

# EIP20Interface.sol

View Source: [contracts/EIP20Interface.sol](https://github.com/AlkemiNetwork/alkemi-earn-contracts/tree/ae6d5c01ff8b3810c4005457ac7ce441ab1c7ec5/contracts/EIP20Interface.sol)

### Contract Members

**Constants & Variables**

```javascript
uint256 public totalSupply;
uint8 public decimals;
```

**Events**

```javascript
event Transfer(address indexed _from, address indexed _to, uint256  _value);
event Approval(address indexed _owner, address indexed _spender, uint256  _value);
```

### Functions

* balanceOf(address \_owner)
* transfer(address \_to, uint256 \_value)
* transferFrom(address \_from, address \_to, uint256 \_value)
* approve(address \_spender, uint256 \_value)
* allowance(address \_owner, address \_spender)

#### balanceOf

```javascript
function balanceOf(address _owner) public view
returns(balance uint256)
```

**Returns**

The balance

**Arguments**

| Name    | Type    | Description                                          |
| ------- | ------- | ---------------------------------------------------- |
| \_owner | address | The address from which the balance will be retrieved |

#### transfer

send `_value` token to `_to` from `msg.sender`

```javascript
function transfer(address _to, uint256 _value) public nonpayable
returns(success bool)
```

**Returns**

Whether the transfer was successful or not

**Arguments**

| Name    | Type    | Description                           |
| ------- | ------- | ------------------------------------- |
| \_to    | address | The address of the recipient          |
| \_value | uint256 | The amount of token to be transferred |

#### transferFrom

send `_value` token to `_to` from `_from` on the condition it is approved by `_from`

```javascript
function transferFrom(address _from, address _to, uint256 _value) public nonpayable
returns(success bool)
```

**Returns**

Whether the transfer was successful or not

**Arguments**

| Name    | Type    | Description                           |
| ------- | ------- | ------------------------------------- |
| \_from  | address | The address of the sender             |
| \_to    | address | The address of the recipient          |
| \_value | uint256 | The amount of token to be transferred |

#### approve

`msg.sender` approves `_spender` to spend `_value` tokens

```javascript
function approve(address _spender, uint256 _value) public nonpayable
returns(success bool)
```

**Returns**

Whether the approval was successful or not

**Arguments**

| Name      | Type    | Description                                            |
| --------- | ------- | ------------------------------------------------------ |
| \_spender | address | The address of the account able to transfer the tokens |
| \_value   | uint256 | The amount of tokens to be approved for transfer       |

#### allowance

```javascript
function allowance(address _owner, address _spender) public view
returns(remaining uint256)
```

**Returns**

Amount of remaining tokens allowed to spent

**Arguments**

| Name      | Type    | Description                                            |
| --------- | ------- | ------------------------------------------------------ |
| \_owner   | address | The address of the account owning tokens               |
| \_spender | address | The address of the account able to transfer the tokens |