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0x331B9182088e2A7d6D3Fe4742AbA1fB231aEcc56

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Approve162025612025-02-10 19:30:333 hrs ago1739215833IN
Frax Finance: CRV Token
0 frxETH0.000000050.001125
Approve162011192025-02-10 18:42:294 hrs ago1739212949IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve162005722025-02-10 18:24:154 hrs ago1739211855IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161964352025-02-10 16:06:216 hrs ago1739203581IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161964322025-02-10 16:06:156 hrs ago1739203575IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161938192025-02-10 14:39:098 hrs ago1739198349IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Approve161920902025-02-10 13:41:319 hrs ago1739194891IN
Frax Finance: CRV Token
0 frxETH0.000000050.00110025
Approve161837692025-02-10 9:04:0913 hrs ago1739178249IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161833882025-02-10 8:51:2714 hrs ago1739177487IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Transfer161830612025-02-10 8:40:3314 hrs ago1739176833IN
Frax Finance: CRV Token
0 frxETH0.000000030.00100025
Transfer161823292025-02-10 8:16:0914 hrs ago1739175369IN
Frax Finance: CRV Token
0 frxETH0.000000050.00110025
Approve161822072025-02-10 8:12:0514 hrs ago1739175125IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Approve161794162025-02-10 6:39:0316 hrs ago1739169543IN
Frax Finance: CRV Token
0 frxETH0.000000050.0012
Transfer161784312025-02-10 6:06:1316 hrs ago1739167573IN
Frax Finance: CRV Token
0 frxETH0.000000050.0012
Approve161751332025-02-10 4:16:1718 hrs ago1739160977IN
Frax Finance: CRV Token
0 frxETH0.000000050.00110025
Approve161634202025-02-09 21:45:5125 hrs ago1739137551IN
Frax Finance: CRV Token
0 frxETH0.000000050.00110025
Approve161627152025-02-09 21:22:2125 hrs ago1739136141IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161567032025-02-09 18:01:5728 hrs ago1739124117IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Approve161562512025-02-09 17:46:5329 hrs ago1739123213IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Approve161524582025-02-09 15:40:2731 hrs ago1739115627IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161509692025-02-09 14:50:4932 hrs ago1739112649IN
Frax Finance: CRV Token
0 frxETH0.000000040.00100025
Approve161461602025-02-09 12:10:3134 hrs ago1739103031IN
Frax Finance: CRV Token
0 frxETH0.000000050.001125
Approve161456042025-02-09 11:51:5935 hrs ago1739101919IN
Frax Finance: CRV Token
0 frxETH00.00010025
Approve161453662025-02-09 11:44:0335 hrs ago1739101443IN
Frax Finance: CRV Token
0 frxETH0.000000050.00110025
Approve161344342025-02-09 5:39:3941 hrs ago1739079579IN
Frax Finance: CRV Token
0 frxETH0.000000020.00110025
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8169102024-02-20 15:55:31356 days ago1708444531  Contract Creation0 frxETH

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Contract Source Code Verified (Exact Match)

Contract Name:
ERC20

Compiler Version
vyper:0.3.10

Optimization Enabled:
N/A

Other Settings:
default evmVersion, None license

Contract Source Code (Vyper language format)

# @version 0.3.10
"""
@title ERC20
@notice Bridged token implementation
"""
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 Mint:
    account: indexed(address)
    amount: uint256

event Burn:
    account: indexed(address)
    amount: uint256


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)

SUPPORTED_INTERFACES: constant(bytes4[3]) = [
    # ERC165: bytes4(keccak256('supportsInterface(bytes4)'))
    0x01ffc9a7,
    # Interface corresponding to the legacy L2StandardERC20:
    #   bytes4(keccak256('l1Token()')) == 0xc01e1bd6
    #   bytes4(keccak256('mint(address,uint256)')) == 0x40c10f19
    #   bytes4(keccak256('burn(address,uint256)')) == 0x9dc29fac
    0x1d1d8b63,
    # Interface corresponding to the updated OptimismMintableERC20.
    #   bytes4(keccak256('remoteToken()')) == 0xd6c0b2c4
    #   bytes4(keccak256('bridge()')) == 0xe78cea92
    #   bytes4(keccak256('mint(address,uint256)')) == 0x40c10f19
    #   bytes4(keccak256('burn(address,uint256)')) == 0x9dc29fac
    0xec4fc8e3,
]

allowance: public(HashMap[address, HashMap[address, uint256]])
balanceOf: public(HashMap[address, uint256])
totalSupply: public(uint256)

nonces: public(HashMap[address, uint256])
BRIDGE: public(immutable(address))
REMOTE_TOKEN: public(immutable(address))


@external
def __init__(_name: String[64], _symbol: String[32], _bridge: address, _remote_token: address):
    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,
        )
    )

    BRIDGE = _bridge
    REMOTE_TOKEN = _remote_token


@internal
def _approve(_owner: address, _spender: address, _value: uint256):
    self.allowance[_owner][_spender] = _value

    log Approval(_owner, _spender, _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


@view
@external
def DOMAIN_SEPARATOR() -> bytes32:
    """
    @notice EIP712 domain separator.
    """
    return self._domain_separator()


@pure
@external
def supportsInterface(_interface_id: bytes4) -> bool:
    """
    @dev Interface identification is specified in ERC-165.
    @param interface_id Id of the interface
    """
    return _interface_id in SUPPORTED_INTERFACES


@pure
@external
def bridge() -> address:
    """
    @notice Address of bridge contract.
    @dev Legacy, use `BRIDGE`
    """
    return BRIDGE


@pure
@external
def l1Token() -> address:
    """
    @notice Address of token on L1.
    @dev Legacy, use `REMOTE_TOKEN`
    """
    return REMOTE_TOKEN


@pure
@external
def remoteToken() -> address:
    """
    @notice Address of token on L1.
    @dev Legacy, use `REMOTE_TOKEN`
    """
    return REMOTE_TOKEN


@external
def mint(_to: address, _value: uint256):
    """
    @notice Mint `_value` amount of tokens to `_to`.
    @dev Only callable by an bridge.
    @param _to The account newly minted tokens are credited to.
    @param _value Amount of token to mint
    """
    assert msg.sender == BRIDGE
    assert _to not in [self, empty(address)]

    self.balanceOf[_to] += _value
    self.totalSupply += _value

    log Transfer(empty(address), _to, _value)
    log Mint(_to, _value)


@external
def burn(_from: address, _value: uint256):
    """
    @notice Burn `_value` amount of tokens from `_from`.
    @dev Only callable by bridge.
    @param _from The account to burn the tokens from.
    @param _value The amount of tokens to burn.
    """
    assert msg.sender == BRIDGE

    self.balanceOf[_from] -= _value
    self.totalSupply -= _value

    log Transfer(_from, empty(address), _value)
    log Burn(_from, _value)

Contract Security Audit

Contract ABI

[{"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":"Mint","inputs":[{"name":"account","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Burn","inputs":[{"name":"account","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_bridge","type":"address"},{"name":"_remote_token","type":"address"}],"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":"view","type":"function","name":"DOMAIN_SEPARATOR","inputs":[],"outputs":[{"name":"","type":"bytes32"}]},{"stateMutability":"pure","type":"function","name":"supportsInterface","inputs":[{"name":"_interface_id","type":"bytes4"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"pure","type":"function","name":"bridge","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"pure","type":"function","name":"l1Token","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"pure","type":"function","name":"remoteToken","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"nonpayable","type":"function","name":"mint","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"burn","inputs":[{"name":"_from","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[]},{"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":"BRIDGE","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"REMOTE_TOKEN","inputs":[],"outputs":[{"name":"","type":"address"}]}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _name (string): Curve DAO Token
Arg [1] : _symbol (string): CRV
Arg [2] : _bridge (address): 0x4200000000000000000000000000000000000010
Arg [3] : _remote_token (address): 0xD533a949740bb3306d119CC777fa900bA034cd52

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000004200000000000000000000000000000000000010
Arg [3] : 000000000000000000000000d533a949740bb3306d119cc777fa900ba034cd52
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [5] : 43757276652044414f20546f6b656e0000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 4352560000000000000000000000000000000000000000000000000000000000


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.