IERC20
Last updated
Last updated
Interface of the ERC20 standard as defined in the EIP.
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.
Name | Type | Description |
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Name | Type | Description |
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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.
Name | Type | Description |
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Returns the amount of tokens owned by account
.
Returns the amount of tokens in existence.
Moves amount
tokens from the caller's account to to
. Returns a boolean value indicating whether the operation succeeded. Emits a {Transfer} event.
Moves amount
tokens from from
to to
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.
Emitted when the allowance of a spender
for an owner
is set by a call to {approve}. value
is the new allowance.
Emitted when value
tokens are moved from one account (from
) to another (to
). Note that value
may be zero.
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owner
address
undefined
spender
address
undefined
_0
uint256
undefined
spender
address
undefined
amount
uint256
undefined
_0
bool
undefined
account
address
undefined
_0
uint256
undefined
_0
uint256
undefined
to
address
undefined
amount
uint256
undefined
_0
bool
undefined
from
address
undefined
to
address
undefined
amount
uint256
undefined
_0
bool
undefined
owner indexed
address
undefined
spender indexed
address
undefined
value
uint256
undefined
from indexed
address
undefined
to indexed
address
undefined
value
uint256
undefined