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0x7ca5b0a2910B33e9759DC7dDB0413949071D7575
 

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This contract matches the deployed Bytecode of the Source Code for Contract 0x64E3C23b...1c1ac041d
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Vyper_contract

Compiler Version
vyper:0.2.4

Optimization Enabled:
N/A

Other Settings:
MIT license
# @version 0.2.4
"""
@title Liquidity Gauge
@author Curve Finance
@license MIT
@notice Used for measuring liquidity and insurance
"""

from vyper.interfaces import ERC20

interface CRV20:
    def future_epoch_time_write() -> uint256: nonpayable
    def rate() -> uint256: view

interface Controller:
    def period() -> int128: view
    def period_write() -> int128: nonpayable
    def period_timestamp(p: int128) -> uint256: view
    def gauge_relative_weight(addr: address, time: uint256) -> uint256: view
    def voting_escrow() -> address: view
    def checkpoint(): nonpayable
    def checkpoint_gauge(addr: address): nonpayable

interface Minter:
    def token() -> address: view
    def controller() -> address: view
    def minted(user: address, gauge: address) -> uint256: view

interface VotingEscrow:
    def user_point_epoch(addr: address) -> uint256: view
    def user_point_history__ts(addr: address, epoch: uint256) -> uint256: view


event Deposit:
    provider: indexed(address)
    value: uint256

event Withdraw:
    provider: indexed(address)
    value: uint256

event UpdateLiquidityLimit:
    user: address
    original_balance: uint256
    original_supply: uint256
    working_balance: uint256
    working_supply: uint256


TOKENLESS_PRODUCTION: constant(uint256) = 40
BOOST_WARMUP: constant(uint256) = 2 * 7 * 86400
WEEK: constant(uint256) = 604800

minter: public(address)
crv_token: public(address)
lp_token: public(address)
controller: public(address)
voting_escrow: public(address)
balanceOf: public(HashMap[address, uint256])
totalSupply: public(uint256)
future_epoch_time: public(uint256)

# caller -> recipient -> can deposit?
approved_to_deposit: public(HashMap[address, HashMap[address, bool]])

working_balances: public(HashMap[address, uint256])
working_supply: public(uint256)

# The goal is to be able to calculate ∫(rate * balance / totalSupply dt) from 0 till checkpoint
# All values are kept in units of being multiplied by 1e18
period: public(int128)
period_timestamp: public(uint256[100000000000000000000000000000])

# 1e18 * ∫(rate(t) / totalSupply(t) dt) from 0 till checkpoint
integrate_inv_supply: public(uint256[100000000000000000000000000000])  # bump epoch when rate() changes

# 1e18 * ∫(rate(t) / totalSupply(t) dt) from (last_action) till checkpoint
integrate_inv_supply_of: public(HashMap[address, uint256])
integrate_checkpoint_of: public(HashMap[address, uint256])


# ∫(balance * rate(t) / totalSupply(t) dt) from 0 till checkpoint
# Units: rate * t = already number of coins per address to issue
integrate_fraction: public(HashMap[address, uint256])

inflation_rate: public(uint256)


@external
def __init__(lp_addr: address, _minter: address):
    """
    @notice Contract constructor
    @param lp_addr Liquidity Pool contract address
    @param _minter Minter contract address
    """

    assert lp_addr != ZERO_ADDRESS
    assert _minter != ZERO_ADDRESS

    self.lp_token = lp_addr
    self.minter = _minter
    crv_addr: address = Minter(_minter).token()
    self.crv_token = crv_addr
    controller_addr: address = Minter(_minter).controller()
    self.controller = controller_addr
    self.voting_escrow = Controller(controller_addr).voting_escrow()
    self.period_timestamp[0] = block.timestamp
    self.inflation_rate = CRV20(crv_addr).rate()
    self.future_epoch_time = CRV20(crv_addr).future_epoch_time_write()


@internal
def _update_liquidity_limit(addr: address, l: uint256, L: uint256):
    """
    @notice Calculate limits which depend on the amount of CRV token per-user.
            Effectively it calculates working balances to apply amplification
            of CRV production by CRV
    @param addr User address
    @param l User's amount of liquidity (LP tokens)
    @param L Total amount of liquidity (LP tokens)
    """
    # To be called after totalSupply is updated
    _voting_escrow: address = self.voting_escrow
    voting_balance: uint256 = ERC20(_voting_escrow).balanceOf(addr)
    voting_total: uint256 = ERC20(_voting_escrow).totalSupply()

    lim: uint256 = l * TOKENLESS_PRODUCTION / 100
    if (voting_total > 0) and (block.timestamp > self.period_timestamp[0] + BOOST_WARMUP):
        lim += L * voting_balance / voting_total * (100 - TOKENLESS_PRODUCTION) / 100

    lim = min(l, lim)
    old_bal: uint256 = self.working_balances[addr]
    self.working_balances[addr] = lim
    _working_supply: uint256 = self.working_supply + lim - old_bal
    self.working_supply = _working_supply

    log UpdateLiquidityLimit(addr, l, L, lim, _working_supply)


@internal
def _checkpoint(addr: address):
    """
    @notice Checkpoint for a user
    @param addr User address
    """
    _token: address = self.crv_token
    _controller: address = self.controller
    _period: int128 = self.period
    _period_time: uint256 = self.period_timestamp[_period]
    _integrate_inv_supply: uint256 = self.integrate_inv_supply[_period]
    rate: uint256 = self.inflation_rate
    new_rate: uint256 = rate
    prev_future_epoch: uint256 = self.future_epoch_time
    if prev_future_epoch >= _period_time:
        self.future_epoch_time = CRV20(_token).future_epoch_time_write()
        new_rate = CRV20(_token).rate()
        self.inflation_rate = new_rate
    Controller(_controller).checkpoint_gauge(self)

    _working_balance: uint256 = self.working_balances[addr]
    _working_supply: uint256 = self.working_supply

    # Update integral of 1/supply
    if block.timestamp > _period_time:
        prev_week_time: uint256 = _period_time
        week_time: uint256 = min((_period_time + WEEK) / WEEK * WEEK, block.timestamp)

        for i in range(500):
            dt: uint256 = week_time - prev_week_time
            w: uint256 = Controller(_controller).gauge_relative_weight(self, prev_week_time / WEEK * WEEK)

            if _working_supply > 0:
                if prev_future_epoch >= prev_week_time and prev_future_epoch < week_time:
                    # If we went across one or multiple epochs, apply the rate
                    # of the first epoch until it ends, and then the rate of
                    # the last epoch.
                    # If more than one epoch is crossed - the gauge gets less,
                    # but that'd meen it wasn't called for more than 1 year
                    _integrate_inv_supply += rate * w * (prev_future_epoch - prev_week_time) / _working_supply
                    rate = new_rate
                    _integrate_inv_supply += rate * w * (week_time - prev_future_epoch) / _working_supply
                else:
                    _integrate_inv_supply += rate * w * dt / _working_supply
                # On precisions of the calculation
                # rate ~= 10e18
                # last_weight > 0.01 * 1e18 = 1e16 (if pool weight is 1%)
                # _working_supply ~= TVL * 1e18 ~= 1e26 ($100M for example)
                # The largest loss is at dt = 1
                # Loss is 1e-9 - acceptable

            if week_time == block.timestamp:
                break
            prev_week_time = week_time
            week_time = min(week_time + WEEK, block.timestamp)

    _period += 1
    self.period = _period
    self.period_timestamp[_period] = block.timestamp
    self.integrate_inv_supply[_period] = _integrate_inv_supply

    # Update user-specific integrals
    self.integrate_fraction[addr] += _working_balance * (_integrate_inv_supply - self.integrate_inv_supply_of[addr]) / 10 ** 18
    self.integrate_inv_supply_of[addr] = _integrate_inv_supply
    self.integrate_checkpoint_of[addr] = block.timestamp


@external
def user_checkpoint(addr: address) -> bool:
    """
    @notice Record a checkpoint for `addr`
    @param addr User address
    @return bool success
    """
    assert (msg.sender == addr) or (msg.sender == self.minter)  # dev: unauthorized
    self._checkpoint(addr)
    self._update_liquidity_limit(addr, self.balanceOf[addr], self.totalSupply)
    return True


@external
def claimable_tokens(addr: address) -> uint256:
    """
    @notice Get the number of claimable tokens per user
    @dev This function should be manually changed to "view" in the ABI
    @return uint256 number of claimable tokens per user
    """
    self._checkpoint(addr)
    return self.integrate_fraction[addr] - Minter(self.minter).minted(addr, self)


@external
def kick(addr: address):
    """
    @notice Kick `addr` for abusing their boost
    @dev Only if either they had another voting event, or their voting escrow lock expired
    @param addr Address to kick
    """
    _voting_escrow: address = self.voting_escrow
    t_last: uint256 = self.integrate_checkpoint_of[addr]
    t_ve: uint256 = VotingEscrow(_voting_escrow).user_point_history__ts(
        addr, VotingEscrow(_voting_escrow).user_point_epoch(addr)
    )
    _balance: uint256 = self.balanceOf[addr]

    assert ERC20(self.voting_escrow).balanceOf(addr) == 0 or t_ve > t_last # dev: kick not allowed
    assert self.working_balances[addr] > _balance * TOKENLESS_PRODUCTION / 100  # dev: kick not needed

    self._checkpoint(addr)
    self._update_liquidity_limit(addr, self.balanceOf[addr], self.totalSupply)


@external
def set_approve_deposit(addr: address, can_deposit: bool):
    """
    @notice Set whether `addr` can deposit tokens for `msg.sender`
    @param addr Address to set approval on
    @param can_deposit bool - can this account deposit for `msg.sender`?
    """
    self.approved_to_deposit[addr][msg.sender] = can_deposit


@external
@nonreentrant('lock')
def deposit(_value: uint256, addr: address = msg.sender):
    """
    @notice Deposit `_value` LP tokens
    @param _value Number of tokens to deposit
    @param addr Address to deposit for
    """
    if addr != msg.sender:
        assert self.approved_to_deposit[msg.sender][addr], "Not approved"

    self._checkpoint(addr)

    if _value != 0:
        _balance: uint256 = self.balanceOf[addr] + _value
        _supply: uint256 = self.totalSupply + _value
        self.balanceOf[addr] = _balance
        self.totalSupply = _supply

        self._update_liquidity_limit(addr, _balance, _supply)

        assert ERC20(self.lp_token).transferFrom(msg.sender, self, _value)

    log Deposit(addr, _value)


@external
@nonreentrant('lock')
def withdraw(_value: uint256):
    """
    @notice Withdraw `_value` LP tokens
    @param _value Number of tokens to withdraw
    """
    self._checkpoint(msg.sender)

    _balance: uint256 = self.balanceOf[msg.sender] - _value
    _supply: uint256 = self.totalSupply - _value
    self.balanceOf[msg.sender] = _balance
    self.totalSupply = _supply

    self._update_liquidity_limit(msg.sender, _balance, _supply)

    assert ERC20(self.lp_token).transfer(msg.sender, _value)

    log Withdraw(msg.sender, _value)


@external
@view
def integrate_checkpoint() -> uint256:
    return self.period_timestamp[self.period]

Contract Security Audit

Contract ABI

[{"name":"Deposit","inputs":[{"type":"address","name":"provider","indexed":true},{"type":"uint256","name":"value","indexed":false}],"anonymous":false,"type":"event"},{"name":"Withdraw","inputs":[{"type":"address","name":"provider","indexed":true},{"type":"uint256","name":"value","indexed":false}],"anonymous":false,"type":"event"},{"name":"UpdateLiquidityLimit","inputs":[{"type":"address","name":"user","indexed":false},{"type":"uint256","name":"original_balance","indexed":false},{"type":"uint256","name":"original_supply","indexed":false},{"type":"uint256","name":"working_balance","indexed":false},{"type":"uint256","name":"working_supply","indexed":false}],"anonymous":false,"type":"event"},{"outputs":[],"inputs":[{"type":"address","name":"lp_addr"},{"type":"address","name":"_minter"}],"stateMutability":"nonpayable","type":"constructor"},{"name":"user_checkpoint","outputs":[{"type":"bool","name":""}],"inputs":[{"type":"address","name":"addr"}],"stateMutability":"nonpayable","type":"function","gas":2079152},{"name":"claimable_tokens","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"addr"}],"stateMutability":"nonpayable","type":"function","gas":1998318},{"name":"kick","outputs":[],"inputs":[{"type":"address","name":"addr"}],"stateMutability":"nonpayable","type":"function","gas":2084532},{"name":"set_approve_deposit","outputs":[],"inputs":[{"type":"address","name":"addr"},{"type":"bool","name":"can_deposit"}],"stateMutability":"nonpayable","type":"function","gas":35766},{"name":"deposit","outputs":[],"inputs":[{"type":"uint256","name":"_value"}],"stateMutability":"nonpayable","type":"function"},{"name":"deposit","outputs":[],"inputs":[{"type":"uint256","name":"_value"},{"type":"address","name":"addr"}],"stateMutability":"nonpayable","type":"function"},{"name":"withdraw","outputs":[],"inputs":[{"type":"uint256","name":"_value"}],"stateMutability":"nonpayable","type":"function","gas":2208318},{"name":"integrate_checkpoint","outputs":[{"type":"uint256","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":2297},{"name":"minter","outputs":[{"type":"address","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1421},{"name":"crv_token","outputs":[{"type":"address","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1451},{"name":"lp_token","outputs":[{"type":"address","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1481},{"name":"controller","outputs":[{"type":"address","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1511},{"name":"voting_escrow","outputs":[{"type":"address","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1541},{"name":"balanceOf","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"arg0"}],"stateMutability":"view","type":"function","gas":1725},{"name":"totalSupply","outputs":[{"type":"uint256","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1601},{"name":"future_epoch_time","outputs":[{"type":"uint256","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1631},{"name":"approved_to_deposit","outputs":[{"type":"bool","name":""}],"inputs":[{"type":"address","name":"arg0"},{"type":"address","name":"arg1"}],"stateMutability":"view","type":"function","gas":1969},{"name":"working_balances","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"arg0"}],"stateMutability":"view","type":"function","gas":1845},{"name":"working_supply","outputs":[{"type":"uint256","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1721},{"name":"period","outputs":[{"type":"int128","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1751},{"name":"period_timestamp","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"uint256","name":"arg0"}],"stateMutability":"view","type":"function","gas":1890},{"name":"integrate_inv_supply","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"uint256","name":"arg0"}],"stateMutability":"view","type":"function","gas":1920},{"name":"integrate_inv_supply_of","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"arg0"}],"stateMutability":"view","type":"function","gas":1995},{"name":"integrate_checkpoint_of","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"arg0"}],"stateMutability":"view","type":"function","gas":2025},{"name":"integrate_fraction","outputs":[{"type":"uint256","name":""}],"inputs":[{"type":"address","name":"arg0"}],"stateMutability":"view","type":"function","gas":2055},{"name":"inflation_rate","outputs":[{"type":"uint256","name":""}],"inputs":[],"stateMutability":"view","type":"function","gas":1931}]

Deployed Bytecode

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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.