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Token

Acala Developers

MultiCurrency Predeploy Contract

You can use this predeploy contract to call currencies pallet

This contracts will interact with currencies pallet

Methods

allowance

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

Get the remaining number of tokens that spender will be allowed to spend.

Parameters

Name Type Description
owner address The owner address.
spender address The spender address.

Returns

Name Type Description
_0 uint256 Returns the remaining number of tokens. The spender will be allowed to spend on behalf of owner through {transferFrom}. This is zero by default.

approve

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

Sets amount as the allowance of spender over the caller's tokens.

It'll emit an {Approval} event. If amount is the maximum uint256, the allowance is not updated on transferFrom. This is semantically equivalent to an infinite approval.

Parameters

Name Type Description
spender address Approve the spender.
amount uint256 The approve amount.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

balanceOf

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

Get the amount of tokens owned by account.

Parameters

Name Type Description
account address The specified user.

Returns

Name Type Description
_0 uint256 Returns the amount of tokens owned by account.

decimals

function decimals() external view returns (uint8)

Get the number of decimals used to get its user representation.

Returns

Name Type Description
_0 uint8 Returns the number of decimals.

decreaseAllowance

function decreaseAllowance(address spender, uint256 subtractedValue) external nonpayable returns (bool)

Atomically decreases the allowance granted to spender by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance.

Parameters

Name Type Description
spender address must have allowance for the caller of at least subtractedValue. It cannot be the zero address.
subtractedValue uint256 The subtracted value.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

increaseAllowance

function increaseAllowance(address spender, uint256 addedValue) external nonpayable returns (bool)

Atomically increases the allowance granted to spender by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance.

Parameters

Name Type Description
spender address It cannot be the zero address.
addedValue uint256 The added value.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

name

function name() external view returns (string)

Get the name of the token.

Returns

Name Type Description
_0 string Returns the name of the token.

symbol

function symbol() external view returns (string)

Get the symbol of the token, usually a shorter version of the name.

Returns

Name Type Description
_0 string Returns the symbol of the token.

totalSupply

function totalSupply() external view returns (uint256)

Get the amount of tokens in existence.

Returns

Name Type Description
_0 uint256 Returns amount of tokens in existence.

transfer

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

Moves amount tokens from the caller's account to to.

It'll emit an {Transfer} event. The caller must have a balance of at least amount.

Parameters

Name Type Description
to address The dest address, it cannot be the zero address.
amount uint256 The transfer amount.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

transferFrom

function transferFrom(address from, address to, uint256 amount) external nonpayable returns (bool)

Moves amount tokens from from to to using the allowance mechanism. amount is then deducted from the caller's allowance.

It'll emit an {Transfer} event.

Parameters

Name Type Description
from address Transfer amount from the address. The caller must have allowance for from's tokens of at least amount. It cannot be the zero address.
to address Transfer amount to the address. It cannot be the zero address.
amount uint256 The transfer amount.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

transferToAccountId32

function transferToAccountId32(bytes32 dest, uint256 amount) external nonpayable returns (bool)

Moves amount tokens from the caller's account to dest, which is AccountId32 type account.

It'll emit an {TransferToAccountId32} event. The caller must have a balance of at least amount.

Parameters

Name Type Description
dest bytes32 The dest AccountId32 type account, it cannot be the zero AccountId32.
amount uint256 The transfer amount.

Returns

Name Type Description
_0 bool Returns a boolean value indicating whether the operation succeeded.

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

Name Type Description
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

Name Type Description
from indexed address undefined
to indexed address undefined
value uint256 undefined

TransferToAccountId32

event TransferToAccountId32(address indexed sender, bytes32 indexed dest, uint256 amount)

Transfer event to AccountId32 type account.

This is Transfer event which transfer AccountId32 type account.

Parameters

Name Type Description
sender indexed address The sender of the transaction.
dest indexed bytes32 The dest AccountId32 type account.
amount uint256 The transfer amount.