Covalent Query Token
ERC20
This contract is an ERC20 token.
Name
Covalent Query Token
Symbol
CQT
Decimals
18
Total Supply
1,000,000,000 CQT
About
Covalent (CQT) is a cryptocurrency and operates on the Ethereum platform. Covalent has a current supply of 1,000,000,000 with 49,665,076 in circulation. The last known price of Covalent is 0.34725601 USD and is up 4.40 over the last 24 hours. It is currently trading on 14 active market(s) with $2,089,400.56 traded over the last 24 hours.
Stats
Public Functions
17
Event Types
3
Code Size
32,518 bytes
Constants (1) keyboard_arrow_up
PERMIT_TYPEHASH Constant
bytes32 help
0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9
State Variables (9) keyboard_arrow_up
Functions
owner keyboard_arrow_up
renounceOwnership keyboard_arrow_up
transferOwnership keyboard_arrow_up
Modifiers help
onlyOwner checks for the following:
Source Code
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
name keyboard_arrow_up
symbol keyboard_arrow_up
decimals keyboard_arrow_up
totalSupply keyboard_arrow_up
balanceOf keyboard_arrow_up
transfer keyboard_arrow_up
Requirements help
Source Code
function transfer(address recipient, uint256 amount)
public
virtual
override
returns (bool)
{
_transfer(_msgSender(), recipient, amount);
return true;
}
allowance keyboard_arrow_up
approve keyboard_arrow_up
Requirements help
Source Code
function approve(address spender, uint256 amount)
public
virtual
override
returns (bool)
{
_approve(_msgSender(), spender, amount);
return true;
}
transferFrom keyboard_arrow_up
Requirements help
Source Code
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(
amount,
"ERC20: transfer amount exceeds allowance"
)
);
return true;
}
increaseAllowance keyboard_arrow_up
Requirements help
Source Code
function increaseAllowance(address spender, uint256 addedValue)
public
virtual
returns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].add(addedValue)
);
return true;
}
decreaseAllowance keyboard_arrow_up
Requirements help
Source Code
function decreaseAllowance(address spender, uint256 subtractedValue)
public
virtual
returns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(
subtractedValue,
"ERC20: decreased allowance below zero"
)
);
return true;
}
permit keyboard_arrow_up
Parameters help
Requirements help
Source Code
function permit(
address owner,
address spender,
uint256 amount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual override {
require(block.timestamp <= deadline, "CovalentPermit: expired deadline");
bytes32 hashStruct = keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
amount,
_nonces[owner].current(),
deadline
)
);
bytes32 _hash = keccak256(
abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)
);
address signer = ecrecover(_hash, v, r, s);
require(
signer != address(0) && signer == owner,
"CovalentPermit: Invalid signature"
);
_nonces[owner].increment();
_approve(owner, spender, amount);
}
nonces keyboard_arrow_up
rescueTokens keyboard_arrow_up
Modifiers help
onlyOwner checks for the following:
Requirements help
Source Code
function rescueTokens(
address token,
address destination,
uint256 amount
) external onlyOwner {
require(token != destination, "Invalid address");
require(ERC20(token).transfer(destination, amount), "Retrieve failed");
}
Internal Functions
Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.
internal ERC20Permit.constructor keyboard_arrow_up
Parameters help
This function has no parameters.
Source Code
constructor() internal {
uint256 chainID;
assembly {
chainID := chainid()
}
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
),
keccak256(bytes(name())),
keccak256(bytes("1")), // Version
chainID,
address(this)
)
);
}
internal ERC20._transfer keyboard_arrow_up
Requirements help
Source Code
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(
amount,
"ERC20: transfer amount exceeds balance"
);
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
internal ERC20._mint keyboard_arrow_up
Source Code
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
internal ERC20._burn keyboard_arrow_up
Source Code
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(
amount,
"ERC20: burn amount exceeds balance"
);
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
internal ERC20._approve keyboard_arrow_up
Requirements help
Source Code
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
internal ERC20._setupDecimals keyboard_arrow_up
internal ERC20._beforeTokenTransfer keyboard_arrow_up
internal Context._msgSender keyboard_arrow_up
internal Context._msgData keyboard_arrow_up
Parameters help
This function has no parameters.
Source Code
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
internal Ownable.constructor keyboard_arrow_up
internal Context._msgSender keyboard_arrow_up
internal Context._msgData keyboard_arrow_up
Parameters help
This function has no parameters.
Source Code
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}