Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
Curve.fi
Overview
Max Total Supply
716,205,627.519519347794077853 crvUSD
Holders
2,650 ( 0.453%)
Market
Price
$1.00 @ 0.000396 ETH (-0.09%)
Onchain Market Cap
$714,344,925.30
Circulating Supply Market Cap
$60,334,399.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
crvUSD Stablecoin
Compiler Version
vyper:0.3.7
Contract Source Code (Vyper language format)
# @version 0.3.7 """ @title crvUSD Stablecoin @author Curve.Fi @license Copyright (c) Curve.Fi, 2020-2023 - all rights reserved """ from vyper.interfaces import ERC20 implements: ERC20 interface ERC1271: def isValidSignature(_hash: bytes32, _signature: Bytes[65]) -> bytes4: view event Approval: owner: indexed(address) spender: indexed(address) value: uint256 event Transfer: sender: indexed(address) receiver: indexed(address) value: uint256 event SetMinter: minter: indexed(address) decimals: public(constant(uint8)) = 18 version: public(constant(String[8])) = "v1.0.0" ERC1271_MAGIC_VAL: constant(bytes4) = 0x1626ba7e EIP712_TYPEHASH: constant(bytes32) = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)" ) EIP2612_TYPEHASH: constant(bytes32) = keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ) VERSION_HASH: constant(bytes32) = keccak256(version) name: public(immutable(String[64])) symbol: public(immutable(String[32])) salt: public(immutable(bytes32)) NAME_HASH: immutable(bytes32) CACHED_CHAIN_ID: immutable(uint256) CACHED_DOMAIN_SEPARATOR: immutable(bytes32) allowance: public(HashMap[address, HashMap[address, uint256]]) balanceOf: public(HashMap[address, uint256]) totalSupply: public(uint256) nonces: public(HashMap[address, uint256]) minter: public(address) @external def __init__(_name: String[64], _symbol: String[32]): name = _name symbol = _symbol NAME_HASH = keccak256(_name) CACHED_CHAIN_ID = chain.id salt = block.prevhash CACHED_DOMAIN_SEPARATOR = keccak256( _abi_encode( EIP712_TYPEHASH, keccak256(_name), VERSION_HASH, chain.id, self, block.prevhash, ) ) self.minter = msg.sender log SetMinter(msg.sender) @internal def _approve(_owner: address, _spender: address, _value: uint256): self.allowance[_owner][_spender] = _value log Approval(_owner, _spender, _value) @internal def _burn(_from: address, _value: uint256): self.balanceOf[_from] -= _value self.totalSupply -= _value log Transfer(_from, empty(address), _value) @internal def _transfer(_from: address, _to: address, _value: uint256): assert _to not in [self, empty(address)] self.balanceOf[_from] -= _value self.balanceOf[_to] += _value log Transfer(_from, _to, _value) @view @internal def _domain_separator() -> bytes32: if chain.id != CACHED_CHAIN_ID: return keccak256( _abi_encode( EIP712_TYPEHASH, NAME_HASH, VERSION_HASH, chain.id, self, salt, ) ) return CACHED_DOMAIN_SEPARATOR @external def transferFrom(_from: address, _to: address, _value: uint256) -> bool: """ @notice Transfer tokens from one account to another. @dev The caller needs to have an allowance from account `_from` greater than or equal to the value being transferred. An allowance equal to the uint256 type's maximum, is considered infinite and does not decrease. @param _from The account which tokens will be spent from. @param _to The account which tokens will be sent to. @param _value The amount of tokens to be transferred. """ allowance: uint256 = self.allowance[_from][msg.sender] if allowance != max_value(uint256): self._approve(_from, msg.sender, allowance - _value) self._transfer(_from, _to, _value) return True @external def transfer(_to: address, _value: uint256) -> bool: """ @notice Transfer tokens to `_to`. @param _to The account to transfer tokens to. @param _value The amount of tokens to transfer. """ self._transfer(msg.sender, _to, _value) return True @external def approve(_spender: address, _value: uint256) -> bool: """ @notice Allow `_spender` to transfer up to `_value` amount of tokens from the caller's account. @dev Non-zero to non-zero approvals are allowed, but should be used cautiously. The methods increaseAllowance + decreaseAllowance are available to prevent any front-running that may occur. @param _spender The account permitted to spend up to `_value` amount of caller's funds. @param _value The amount of tokens `_spender` is allowed to spend. """ self._approve(msg.sender, _spender, _value) return True @external def permit( _owner: address, _spender: address, _value: uint256, _deadline: uint256, _v: uint8, _r: bytes32, _s: bytes32, ) -> bool: """ @notice Permit `_spender` to spend up to `_value` amount of `_owner`'s tokens via a signature. @dev In the event of a chain fork, replay attacks are prevented as domain separator is recalculated. However, this is only if the resulting chains update their chainId. @param _owner The account which generated the signature and is granting an allowance. @param _spender The account which will be granted an allowance. @param _value The approval amount. @param _deadline The deadline by which the signature must be submitted. @param _v The last byte of the ECDSA signature. @param _r The first 32 bytes of the ECDSA signature. @param _s The second 32 bytes of the ECDSA signature. """ assert _owner != empty(address) and block.timestamp <= _deadline nonce: uint256 = self.nonces[_owner] digest: bytes32 = keccak256( concat( b"\x19\x01", self._domain_separator(), keccak256(_abi_encode(EIP2612_TYPEHASH, _owner, _spender, _value, nonce, _deadline)), ) ) if _owner.is_contract: sig: Bytes[65] = concat(_abi_encode(_r, _s), slice(convert(_v, bytes32), 31, 1)) assert ERC1271(_owner).isValidSignature(digest, sig) == ERC1271_MAGIC_VAL else: assert ecrecover(digest, _v, _r, _s) == _owner self.nonces[_owner] = nonce + 1 self._approve(_owner, _spender, _value) return True @external def increaseAllowance(_spender: address, _add_value: uint256) -> bool: """ @notice Increase the allowance granted to `_spender`. @dev This function will never overflow, and instead will bound allowance to MAX_UINT256. This has the potential to grant an infinite approval. @param _spender The account to increase the allowance of. @param _add_value The amount to increase the allowance by. """ cached_allowance: uint256 = self.allowance[msg.sender][_spender] allowance: uint256 = unsafe_add(cached_allowance, _add_value) # check for an overflow if allowance < cached_allowance: allowance = max_value(uint256) if allowance != cached_allowance: self._approve(msg.sender, _spender, allowance) return True @external def decreaseAllowance(_spender: address, _sub_value: uint256) -> bool: """ @notice Decrease the allowance granted to `_spender`. @dev This function will never underflow, and instead will bound allowance to 0. @param _spender The account to decrease the allowance of. @param _sub_value The amount to decrease the allowance by. """ cached_allowance: uint256 = self.allowance[msg.sender][_spender] allowance: uint256 = unsafe_sub(cached_allowance, _sub_value) # check for an underflow if cached_allowance < allowance: allowance = 0 if allowance != cached_allowance: self._approve(msg.sender, _spender, allowance) return True @external def burnFrom(_from: address, _value: uint256) -> bool: """ @notice Burn `_value` amount of tokens from `_from`. @dev The caller must have previously been given an allowance by `_from`. @param _from The account to burn the tokens from. @param _value The amount of tokens to burn. """ allowance: uint256 = self.allowance[_from][msg.sender] if allowance != max_value(uint256): self._approve(_from, msg.sender, allowance - _value) self._burn(_from, _value) return True @external def burn(_value: uint256) -> bool: """ @notice Burn `_value` amount of tokens. @param _value The amount of tokens to burn. """ self._burn(msg.sender, _value) return True @external def mint(_to: address, _value: uint256) -> bool: """ @notice Mint `_value` amount of tokens to `_to`. @dev Only callable by an account with minter privileges. @param _to The account newly minted tokens are credited to. @param _value The amount of tokens to mint. """ assert msg.sender == self.minter assert _to not in [self, empty(address)] self.balanceOf[_to] += _value self.totalSupply += _value log Transfer(empty(address), _to, _value) return True @external def set_minter(_minter: address): assert msg.sender == self.minter self.minter = _minter log SetMinter(_minter) @view @external def DOMAIN_SEPARATOR() -> bytes32: """ @notice EIP712 domain separator. """ return self._domain_separator()
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"name":"Approval","inputs":[{"name":"owner","type":"address","indexed":true},{"name":"spender","type":"address","indexed":true},{"name":"value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Transfer","inputs":[{"name":"sender","type":"address","indexed":true},{"name":"receiver","type":"address","indexed":true},{"name":"value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"SetMinter","inputs":[{"name":"minter","type":"address","indexed":true}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_name","type":"string"},{"name":"_symbol","type":"string"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"transferFrom","inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"transfer","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"approve","inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"permit","inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_deadline","type":"uint256"},{"name":"_v","type":"uint8"},{"name":"_r","type":"bytes32"},{"name":"_s","type":"bytes32"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"increaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_add_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"decreaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_sub_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"burnFrom","inputs":[{"name":"_from","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"burn","inputs":[{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"mint","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"set_minter","inputs":[{"name":"_minter","type":"address"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"DOMAIN_SEPARATOR","inputs":[],"outputs":[{"name":"","type":"bytes32"}]},{"stateMutability":"view","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint8"}]},{"stateMutability":"view","type":"function","name":"version","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"name","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"symbol","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"salt","inputs":[],"outputs":[{"name":"","type":"bytes32"}]},{"stateMutability":"view","type":"function","name":"allowance","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"balanceOf","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"totalSupply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"nonces","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"minter","inputs":[],"outputs":[{"name":"","type":"address"}]}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000001743757276652e46692055534420537461626c65636f696e00000000000000000000000000000000000000000000000000000000000000000000000000000000066372765553440000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): Curve.Fi USD Stablecoin
Arg [1] : _symbol (string): crvUSD
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000017
Arg [3] : 43757276652e46692055534420537461626c65636f696e000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [5] : 6372765553440000000000000000000000000000000000000000000000000000
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