IERC20Upgradeable

Interface of the ERC20 standard as defined in the EIP.

Methods

allowance

function allowance(address owner, address spender) external view returns (uint256)

Returns the remaining number of tokens that spender will be allowed to spend on behalf of owner through {transferFrom}. This is zero by default. This value changes when {approve} or {transferFrom} are called.

Parameters

NameTypeDescription

owner

address

undefined

spender

address

undefined

Returns

NameTypeDescription

_0

uint256

undefined

approve

function approve(address spender, uint256 amount) external nonpayable returns (bool)

Sets amount as the allowance of spender over the caller's tokens. Returns a boolean value indicating whether the operation succeeded. IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may use both the old and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 Emits an {Approval} event.

Parameters

NameTypeDescription

spender

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

balanceOf

function balanceOf(address account) external view returns (uint256)

Returns the amount of tokens owned by account.

Parameters

NameTypeDescription

account

address

undefined

Returns

NameTypeDescription

_0

uint256

undefined

totalSupply

function totalSupply() external view returns (uint256)

Returns the amount of tokens in existence.

Returns

NameTypeDescription

_0

uint256

undefined

transfer

function transfer(address recipient, uint256 amount) external nonpayable returns (bool)

Moves amount tokens from the caller's account to recipient. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.

Parameters

NameTypeDescription

recipient

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

transferFrom

function transferFrom(address sender, address recipient, uint256 amount) external nonpayable returns (bool)

Moves amount tokens from sender to recipient using the allowance mechanism. amount is then deducted from the caller's allowance. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.

Parameters

NameTypeDescription

sender

address

undefined

recipient

address

undefined

amount

uint256

undefined

Returns

NameTypeDescription

_0

bool

undefined

Events

Approval

event Approval(address indexed owner, address indexed spender, uint256 value)

Emitted when the allowance of a spender for an owner is set by a call to {approve}. value is the new allowance.

Parameters

NameTypeDescription

owner indexed

address

undefined

spender indexed

address

undefined

value

uint256

undefined

Transfer

event Transfer(address indexed from, address indexed to, uint256 value)

Emitted when value tokens are moved from one account (from) to another (to). Note that value may be zero.

Parameters

NameTypeDescription

from indexed

address

undefined

to indexed

address

undefined

value

uint256

undefined

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