ETH Price: $2,899.45 (-1.03%)
Gas: 37 Gwei

Contract

0xDC24316b9AE028F1497c275EB9192a3Ea0f67022
 

Overview

ETH Balance

44,695.106011738049575789 ETH

Eth Value

$129,591,171.87 (@ $2,899.45/ETH)

Token Holdings

Transaction Hash
Method
Block
From
To
Value
0x76be71114e9a921aad618683dbc92a8b659bd654e4c3d89ff8aa6e65d104be95Remove_liquidity...(pending)2024-02-21 16:30:202 hrs 21 mins ago1708533020IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH(Pending)(Pending)
Exchange192776312024-02-21 17:51:351 hr ago1708537895IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0067930651.3098148
Remove_liquidity...192760642024-02-21 12:34:356 hrs 17 mins ago1708518875IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0037716629.62094184
Remove_liquidity...192759612024-02-21 12:13:596 hrs 37 mins ago1708517639IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.005668944.52937643
Remove_liquidity...192746772024-02-21 7:53:3510 hrs 58 mins ago1708502015IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0041288632.43237551
Remove_liquidity...192731452024-02-21 2:42:5916 hrs 8 mins ago1708483379IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0046342936.40248857
Add_liquidity192730392024-02-21 2:21:2316 hrs 30 mins ago1708482083IN
Lido: Curve Liquidity Farming Pool Contract
0.4 ETH0.0051894235.73492155
Remove_liquidity...192730012024-02-21 2:13:3516 hrs 38 mins ago1708481615IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0045013535.35828404
Remove_liquidity...192728942024-02-21 1:51:4717 hrs ago1708480307IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.004327933.99584784
Remove_liquidity...192715942024-02-20 21:29:3521 hrs 22 mins ago1708464575IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0048841438.3723063
Remove_liquidity...192714872024-02-20 21:07:4721 hrs 44 mins ago1708463267IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0042417533.32221303
Exchange192706772024-02-20 18:24:351 day 27 mins ago1708453475IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0047615635.97189751
Exchange192706522024-02-20 18:19:351 day 32 mins ago1708453175IN
Lido: Curve Liquidity Farming Pool Contract
365 ETH0.0042402835.7431666
Exchange192705342024-02-20 17:55:471 day 56 mins ago1708451747IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0061427346.41453487
Remove_liquidity...192700402024-02-20 16:16:231 day 2 hrs ago1708445783IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0055378438.34251986
Remove_liquidity...192685832024-02-20 11:21:111 day 7 hrs ago1708428071IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0041044432.2405592
Add_liquidity192679762024-02-20 9:17:231 day 9 hrs ago1708420643IN
Lido: Curve Liquidity Farming Pool Contract
0.005 ETH0.0044927430.9400654
Remove_liquidity192664492024-02-20 4:10:471 day 14 hrs ago1708402247IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0027461820.59737798
Remove_liquidity...192644722024-02-19 21:32:471 day 21 hrs ago1708378367IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0048866338.38465168
Exchange192643612024-02-19 21:10:111 day 21 hrs ago1708377011IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0075364959.07781984
Exchange192638542024-02-19 19:28:231 day 23 hrs ago1708370903IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0052832239.91287247
Remove_liquidity...192622652024-02-19 14:06:352 days 4 hrs ago1708351595IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0065935746.19389012
Add_liquidity192622582024-02-19 14:05:112 days 4 hrs ago1708351511IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0065658238.70787748
Remove_liquidity...192606572024-02-19 8:40:352 days 10 hrs ago1708332035IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.0052036431.39888433
Remove_liquidity...192593932024-02-19 4:24:232 days 14 hrs ago1708316663IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.002403618.88392885
View all transactions

Latest 25 internal transactions (View All)

Advanced mode:
Parent Txn Hash Block From To Value
192778532024-02-21 18:36:1115 mins ago1708540571
Lido: Curve Liquidity Farming Pool Contract
0.00649454 ETH
192778442024-02-21 18:34:2317 mins ago1708540463
Lido: Curve Liquidity Farming Pool Contract
130.56 ETH
192777632024-02-21 18:18:1133 mins ago1708539491
Lido: Curve Liquidity Farming Pool Contract
0.0035614 ETH
192776512024-02-21 17:55:3556 mins ago1708538135
Lido: Curve Liquidity Farming Pool Contract
0.62013843 ETH
192776402024-02-21 17:53:2358 mins ago1708538003
Lido: Curve Liquidity Farming Pool Contract
0.00317631 ETH
192776402024-02-21 17:53:2358 mins ago1708538003
Lido: Curve Liquidity Farming Pool Contract
0.01605786 ETH
192776312024-02-21 17:51:351 hr ago1708537895
Lido: Curve Liquidity Farming Pool Contract
30.27226039 ETH
192775882024-02-21 17:42:471 hr 9 mins ago1708537367
Lido: Curve Liquidity Farming Pool Contract
0.01954737 ETH
192775222024-02-21 17:29:231 hr 22 mins ago1708536563
Lido: Curve Liquidity Farming Pool Contract
2.36130427 ETH
192774942024-02-21 17:23:471 hr 28 mins ago1708536227
Lido: Curve Liquidity Farming Pool Contract
3.31866623 ETH
192774262024-02-21 17:10:111 hr 41 mins ago1708535411
Lido: Curve Liquidity Farming Pool Contract
14.64247948 ETH
192772412024-02-21 16:32:472 hrs 19 mins ago1708533167
Lido: Curve Liquidity Farming Pool Contract
19.98999863 ETH
192771802024-02-21 16:20:232 hrs 31 mins ago1708532423
Lido: Curve Liquidity Farming Pool Contract
0.01057319 ETH
192771462024-02-21 16:13:232 hrs 38 mins ago1708532003
Lido: Curve Liquidity Farming Pool Contract
0.02989091 ETH
192771462024-02-21 16:13:232 hrs 38 mins ago1708532003
Lido: Curve Liquidity Farming Pool Contract
0.05514838 ETH
192770712024-02-21 15:58:232 hrs 53 mins ago1708531103
Lido: Curve Liquidity Farming Pool Contract
31.55165205 ETH
192770552024-02-21 15:55:112 hrs 56 mins ago1708530911
Lido: Curve Liquidity Farming Pool Contract
0.74257222 ETH
192769442024-02-21 15:32:593 hrs 18 mins ago1708529579
Lido: Curve Liquidity Farming Pool Contract
0.00894904 ETH
192769112024-02-21 15:25:593 hrs 25 mins ago1708529159
Lido: Curve Liquidity Farming Pool Contract
34.34815927 ETH
192767092024-02-21 14:44:354 hrs 7 mins ago1708526675
Lido: Curve Liquidity Farming Pool Contract
20.83162712 ETH
192766152024-02-21 14:25:354 hrs 26 mins ago1708525535
Lido: Curve Liquidity Farming Pool Contract
0.20747058 ETH
192766092024-02-21 14:24:234 hrs 27 mins ago1708525463
Lido: Curve Liquidity Farming Pool Contract
0.10812779 ETH
192765662024-02-21 14:15:474 hrs 36 mins ago1708524947
Lido: Curve Liquidity Farming Pool Contract
9.99661289 ETH
192764842024-02-21 13:59:234 hrs 52 mins ago1708523963
Lido: Curve Liquidity Farming Pool Contract
3.5861806 ETH
192764542024-02-21 13:53:234 hrs 58 mins ago1708523603
Lido: Curve Liquidity Farming Pool Contract
3.45762613 ETH
View All Internal Transactions
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x32fb6b...FF3F4906
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:0.2.8

Optimization Enabled:
N/A

Other Settings:
None license

Contract Source Code (Vyper language format)

# @version 0.2.8
"""
@title Curve ETH/stETH StableSwap
@author Curve.Fi
@license Copyright (c) Curve.Fi, 2020 - all rights reserved
"""

from vyper.interfaces import ERC20


interface CurveToken:
    def mint(_to: address, _value: uint256) -> bool: nonpayable
    def burnFrom(_to: address, _value: uint256) -> bool: nonpayable


# Events
event TokenExchange:
    buyer: indexed(address)
    sold_id: int128
    tokens_sold: uint256
    bought_id: int128
    tokens_bought: uint256

event TokenExchangeUnderlying:
    buyer: indexed(address)
    sold_id: int128
    tokens_sold: uint256
    bought_id: int128
    tokens_bought: uint256

event AddLiquidity:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    invariant: uint256
    token_supply: uint256

event RemoveLiquidity:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    token_supply: uint256

event RemoveLiquidityOne:
    provider: indexed(address)
    token_amount: uint256
    coin_amount: uint256

event RemoveLiquidityImbalance:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    invariant: uint256
    token_supply: uint256

event CommitNewAdmin:
    deadline: indexed(uint256)
    admin: indexed(address)

event NewAdmin:
    admin: indexed(address)

event CommitNewFee:
    deadline: indexed(uint256)
    fee: uint256
    admin_fee: uint256

event NewFee:
    fee: uint256
    admin_fee: uint256

event RampA:
    old_A: uint256
    new_A: uint256
    initial_time: uint256
    future_time: uint256

event StopRampA:
    A: uint256
    t: uint256


# These constants must be set prior to compiling
N_COINS: constant(int128) = 2

# fixed constants
FEE_DENOMINATOR: constant(uint256) = 10 ** 10
PRECISION: constant(uint256) = 10 ** 18  # The precision to convert to

MAX_ADMIN_FEE: constant(uint256) = 10 * 10 ** 9
MAX_FEE: constant(uint256) = 5 * 10 ** 9

MAX_A: constant(uint256) = 10 ** 6
MAX_A_CHANGE: constant(uint256) = 10
A_PRECISION: constant(uint256) = 100

ADMIN_ACTIONS_DELAY: constant(uint256) = 3 * 86400
MIN_RAMP_TIME: constant(uint256) = 86400

coins: public(address[N_COINS])
admin_balances: public(uint256[N_COINS])

fee: public(uint256)  # fee * 1e10
admin_fee: public(uint256)  # admin_fee * 1e10

owner: public(address)
lp_token: public(address)

initial_A: public(uint256)
future_A: public(uint256)
initial_A_time: public(uint256)
future_A_time: public(uint256)

admin_actions_deadline: public(uint256)
transfer_ownership_deadline: public(uint256)
future_fee: public(uint256)
future_admin_fee: public(uint256)
future_owner: public(address)

is_killed: bool
kill_deadline: uint256
KILL_DEADLINE_DT: constant(uint256) = 2 * 30 * 86400


@external
def __init__(
    _owner: address,
    _coins: address[N_COINS],
    _pool_token: address,
    _A: uint256,
    _fee: uint256,
    _admin_fee: uint256
):
    """
    @notice Contract constructor
    @param _owner Contract owner address
    @param _coins Addresses of ERC20 conracts of coins
    @param _pool_token Address of the token representing LP share
    @param _A Amplification coefficient multiplied by n * (n - 1)
    @param _fee Fee to charge for exchanges
    @param _admin_fee Admin fee
    """
    assert _coins[0] == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
    assert _coins[1] != ZERO_ADDRESS

    self.coins = _coins
    self.initial_A = _A * A_PRECISION
    self.future_A = _A * A_PRECISION
    self.fee = _fee
    self.admin_fee = _admin_fee
    self.owner = _owner
    self.kill_deadline = block.timestamp + KILL_DEADLINE_DT
    self.lp_token = _pool_token


@view
@internal
def _A() -> uint256:
    t1: uint256 = self.future_A_time
    A1: uint256 = self.future_A

    if block.timestamp < t1:
        # handle ramping up and down of A
        A0: uint256 = self.initial_A
        t0: uint256 = self.initial_A_time
        # Expressions in uint256 cannot have negative numbers, thus "if"
        if A1 > A0:
            return A0 + (A1 - A0) * (block.timestamp - t0) / (t1 - t0)
        else:
            return A0 - (A0 - A1) * (block.timestamp - t0) / (t1 - t0)

    else:  # when t1 == 0 or block.timestamp >= t1
        return A1


@view
@external
def A() -> uint256:
    return self._A() / A_PRECISION


@view
@external
def A_precise() -> uint256:
    return self._A()


@view
@internal
def _balances(_value: uint256 = 0) -> uint256[N_COINS]:
    return [
        self.balance - self.admin_balances[0] - _value,
        ERC20(self.coins[1]).balanceOf(self) - self.admin_balances[1]
    ]


@view
@external
def balances(i: uint256) -> uint256:
    """
    @notice Get the current balance of a coin within the
            pool, less the accrued admin fees
    @param i Index value for the coin to query balance of
    @return Token balance
    """
    return self._balances()[i]


@pure
@internal
def get_D(xp: uint256[N_COINS], amp: uint256) -> uint256:
    """
    D invariant calculation in non-overflowing integer operations
    iteratively

    A * sum(x_i) * n**n + D = A * D * n**n + D**(n+1) / (n**n * prod(x_i))

    Converging solution:
    D[j+1] = (A * n**n * sum(x_i) - D[j]**(n+1) / (n**n prod(x_i))) / (A * n**n - 1)
    """
    S: uint256 = 0
    Dprev: uint256 = 0

    for _x in xp:
        S += _x
    if S == 0:
        return 0

    D: uint256 = S
    Ann: uint256 = amp * N_COINS
    for _i in range(255):
        D_P: uint256 = D
        for _x in xp:
            D_P = D_P * D / (_x * N_COINS + 1)  # +1 is to prevent /0
        Dprev = D
        D = (Ann * S / A_PRECISION + D_P * N_COINS) * D / ((Ann - A_PRECISION) * D / A_PRECISION + (N_COINS + 1) * D_P)
        # Equality with the precision of 1
        if D > Dprev:
            if D - Dprev <= 1:
                return D
        else:
            if Dprev - D <= 1:
                return D
    # convergence typically occurs in 4 rounds or less, this should be unreachable!
    # if it does happen the pool is borked and LPs can withdraw via `remove_liquidity`
    raise


@view
@external
def get_virtual_price() -> uint256:
    """
    @notice The current virtual price of the pool LP token
    @dev Useful for calculating profits
    @return LP token virtual price normalized to 1e18
    """
    D: uint256 = self.get_D(self._balances(), self._A())
    # D is in the units similar to DAI (e.g. converted to precision 1e18)
    # When balanced, D = n * x_u - total virtual value of the portfolio
    token_supply: uint256 = ERC20(self.lp_token).totalSupply()
    return D * PRECISION / token_supply


@view
@external
def calc_token_amount(amounts: uint256[N_COINS], is_deposit: bool) -> uint256:
    """
    @notice Calculate addition or reduction in token supply from a deposit or withdrawal
    @dev This calculation accounts for slippage, but not fees.
         Needed to prevent front-running, not for precise calculations!
    @param amounts Amount of each coin being deposited
    @param is_deposit set True for deposits, False for withdrawals
    @return Expected amount of LP tokens received
    """
    amp: uint256 = self._A()
    balances: uint256[N_COINS] = self._balances()
    D0: uint256 = self.get_D(balances, amp)
    for i in range(N_COINS):
        if is_deposit:
            balances[i] += amounts[i]
        else:
            balances[i] -= amounts[i]
    D1: uint256 = self.get_D(balances, amp)
    token_amount: uint256 = ERC20(self.lp_token).totalSupply()
    diff: uint256 = 0
    if is_deposit:
        diff = D1 - D0
    else:
        diff = D0 - D1
    return diff * token_amount / D0


@payable
@external
@nonreentrant('lock')
def add_liquidity(amounts: uint256[N_COINS], min_mint_amount: uint256) -> uint256:
    """
    @notice Deposit coins into the pool
    @param amounts List of amounts of coins to deposit
    @param min_mint_amount Minimum amount of LP tokens to mint from the deposit
    @return Amount of LP tokens received by depositing
    """
    assert not self.is_killed  # dev: is killed

    # Initial invariant
    amp: uint256 = self._A()
    old_balances: uint256[N_COINS] = self._balances(msg.value)
    D0: uint256 = self.get_D(old_balances, amp)

    lp_token: address = self.lp_token
    token_supply: uint256 = ERC20(lp_token).totalSupply()
    new_balances: uint256[N_COINS] = old_balances
    for i in range(N_COINS):
        if token_supply == 0:
            assert amounts[i] > 0  # dev: initial deposit requires all coins
        new_balances[i] += amounts[i]

    # Invariant after change
    D1: uint256 = self.get_D(new_balances, amp)
    assert D1 > D0

    # We need to recalculate the invariant accounting for fees
    # to calculate fair user's share
    fees: uint256[N_COINS] = empty(uint256[N_COINS])
    mint_amount: uint256 = 0
    D2: uint256 = 0
    if token_supply > 0:
        # Only account for fees if we are not the first to deposit
        fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
        admin_fee: uint256 = self.admin_fee
        for i in range(N_COINS):
            ideal_balance: uint256 = D1 * old_balances[i] / D0
            difference: uint256 = 0
            if ideal_balance > new_balances[i]:
                difference = ideal_balance - new_balances[i]
            else:
                difference = new_balances[i] - ideal_balance
            fees[i] = fee * difference / FEE_DENOMINATOR
            if admin_fee != 0:
                self.admin_balances[i] += fees[i] * admin_fee / FEE_DENOMINATOR
            new_balances[i] -= fees[i]
        D2 = self.get_D(new_balances, amp)
        mint_amount = token_supply * (D2 - D0) / D0
    else:
        mint_amount = D1  # Take the dust if there was any

    assert mint_amount >= min_mint_amount, "Slippage screwed you"

    # Take coins from the sender
    assert msg.value == amounts[0]
    if amounts[1] > 0:
        assert ERC20(self.coins[1]).transferFrom(msg.sender, self, amounts[1])

    # Mint pool tokens
    CurveToken(lp_token).mint(msg.sender, mint_amount)

    log AddLiquidity(msg.sender, amounts, fees, D1, token_supply + mint_amount)

    return mint_amount


@view
@internal
def get_y(i: int128, j: int128, x: uint256, xp: uint256[N_COINS]) -> uint256:
    """
    Calculate x[j] if one makes x[i] = x

    Done by solving quadratic equation iteratively.
    x_1**2 + x1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A)
    x_1**2 + b*x_1 = c

    x_1 = (x_1**2 + c) / (2*x_1 + b)
    """
    # x in the input is converted to the same price/precision

    assert i != j       # dev: same coin
    assert j >= 0       # dev: j below zero
    assert j < N_COINS  # dev: j above N_COINS

    # should be unreachable, but good for safety
    assert i >= 0
    assert i < N_COINS

    amp: uint256 = self._A()
    D: uint256 = self.get_D(xp, amp)
    Ann: uint256 = amp * N_COINS
    c: uint256 = D
    S_: uint256 = 0
    _x: uint256 = 0
    y_prev: uint256 = 0

    for _i in range(N_COINS):
        if _i == i:
            _x = x
        elif _i != j:
            _x = xp[_i]
        else:
            continue
        S_ += _x
        c = c * D / (_x * N_COINS)
    c = c * D * A_PRECISION / (Ann * N_COINS)
    b: uint256 = S_ + D * A_PRECISION / Ann  # - D
    y: uint256 = D
    for _i in range(255):
        y_prev = y
        y = (y*y + c) / (2 * y + b - D)
        # Equality with the precision of 1
        if y > y_prev:
            if y - y_prev <= 1:
                return y
        else:
            if y_prev - y <= 1:
                return y
    raise


@view
@external
def get_dy(i: int128, j: int128, dx: uint256) -> uint256:
    xp: uint256[N_COINS] = self._balances()
    x: uint256 = xp[i] + dx
    y: uint256 = self.get_y(i, j, x, xp)
    dy: uint256 = xp[j] - y - 1
    fee: uint256 = self.fee * dy / FEE_DENOMINATOR
    return dy - fee


@payable
@external
@nonreentrant('lock')
def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256) -> uint256:
    """
    @notice Perform an exchange between two coins
    @dev Index values can be found via the `coins` public getter method
    @param i Index value for the coin to send
    @param j Index valie of the coin to recieve
    @param dx Amount of `i` being exchanged
    @param min_dy Minimum amount of `j` to receive
    @return Actual amount of `j` received
    """
    assert not self.is_killed  # dev: is killed
    # dx and dy are in aTokens

    xp: uint256[N_COINS] = self._balances(msg.value)

    x: uint256 = xp[i] + dx
    y: uint256 = self.get_y(i, j, x, xp)
    dy: uint256 = xp[j] - y - 1
    dy_fee: uint256 = dy * self.fee / FEE_DENOMINATOR

    # Convert all to real units
    dy = dy - dy_fee
    assert dy >= min_dy, "Exchange resulted in fewer coins than expected"

    admin_fee: uint256 = self.admin_fee
    if admin_fee != 0:
        dy_admin_fee: uint256 = dy_fee * admin_fee / FEE_DENOMINATOR
        if dy_admin_fee != 0:
            self.admin_balances[j] += dy_admin_fee

    coin: address = self.coins[1]
    if i == 0:
        assert msg.value == dx
        assert ERC20(coin).transfer(msg.sender, dy)
    else:
        assert msg.value == 0
        assert ERC20(coin).transferFrom(msg.sender, self, dx)
        raw_call(msg.sender, b"", value=dy)

    log TokenExchange(msg.sender, i, dx, j, dy)

    return dy


@external
@nonreentrant('lock')
def remove_liquidity(
    _amount: uint256,
    _min_amounts: uint256[N_COINS],
) -> uint256[N_COINS]:
    """
    @notice Withdraw coins from the pool
    @dev Withdrawal amounts are based on current deposit ratios
    @param _amount Quantity of LP tokens to burn in the withdrawal
    @param _min_amounts Minimum amounts of underlying coins to receive
    @return List of amounts of coins that were withdrawn
    """
    amounts: uint256[N_COINS] = self._balances()
    lp_token: address = self.lp_token
    total_supply: uint256 = ERC20(lp_token).totalSupply()
    CurveToken(lp_token).burnFrom(msg.sender, _amount)  # dev: insufficient funds

    for i in range(N_COINS):
        value: uint256 = amounts[i] * _amount / total_supply
        assert value >= _min_amounts[i], "Withdrawal resulted in fewer coins than expected"

        amounts[i] = value
        if i == 0:
            raw_call(msg.sender, b"", value=value)
        else:
            assert ERC20(self.coins[1]).transfer(msg.sender, value)

    log RemoveLiquidity(msg.sender, amounts, empty(uint256[N_COINS]), total_supply - _amount)

    return amounts


@external
@nonreentrant('lock')
def remove_liquidity_imbalance(
    _amounts: uint256[N_COINS],
    _max_burn_amount: uint256
) -> uint256:
    """
    @notice Withdraw coins from the pool in an imbalanced amount
    @param _amounts List of amounts of underlying coins to withdraw
    @param _max_burn_amount Maximum amount of LP token to burn in the withdrawal
    @return Actual amount of the LP token burned in the withdrawal
    """
    assert not self.is_killed  # dev: is killed

    amp: uint256 = self._A()
    old_balances: uint256[N_COINS] = self._balances()
    D0: uint256 = self.get_D(old_balances, amp)
    new_balances: uint256[N_COINS] = old_balances
    for i in range(N_COINS):
        new_balances[i] -= _amounts[i]
    D1: uint256 = self.get_D(new_balances, amp)

    fees: uint256[N_COINS] = empty(uint256[N_COINS])
    fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    admin_fee: uint256 = self.admin_fee
    for i in range(N_COINS):
        ideal_balance: uint256 = D1 * old_balances[i] / D0
        new_balance: uint256 = new_balances[i]
        difference: uint256 = 0
        if ideal_balance > new_balance:
            difference = ideal_balance - new_balance
        else:
            difference = new_balance - ideal_balance
        fees[i] = fee * difference / FEE_DENOMINATOR
        if admin_fee != 0:
            self.admin_balances[i] += fees[i] * admin_fee / FEE_DENOMINATOR
        new_balances[i] -= fees[i]
    D2: uint256 = self.get_D(new_balances, amp)

    lp_token: address = self.lp_token
    token_supply: uint256 = ERC20(lp_token).totalSupply()
    token_amount: uint256 = (D0 - D2) * token_supply / D0

    assert token_amount != 0  # dev: zero tokens burned
    assert token_amount <= _max_burn_amount, "Slippage screwed you"

    CurveToken(lp_token).burnFrom(msg.sender, token_amount)  # dev: insufficient funds

    if _amounts[0] != 0:
        raw_call(msg.sender, b"", value=_amounts[0])
    if _amounts[1] != 0:
        assert ERC20(self.coins[1]).transfer(msg.sender, _amounts[1])

    log RemoveLiquidityImbalance(msg.sender, _amounts, fees, D1, token_supply - token_amount)

    return token_amount


@pure
@internal
def get_y_D(A_: uint256, i: int128, xp: uint256[N_COINS], D: uint256) -> uint256:
    """
    Calculate x[i] if one reduces D from being calculated for xp to D

    Done by solving quadratic equation iteratively.
    x_1**2 + x1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A)
    x_1**2 + b*x_1 = c

    x_1 = (x_1**2 + c) / (2*x_1 + b)
    """
    # x in the input is converted to the same price/precision

    assert i >= 0       # dev: i below zero
    assert i < N_COINS  # dev: i above N_COINS

    Ann: uint256 = A_ * N_COINS
    c: uint256 = D
    S_: uint256 = 0
    _x: uint256 = 0
    y_prev: uint256 = 0

    for _i in range(N_COINS):
        if _i != i:
            _x = xp[_i]
        else:
            continue
        S_ += _x
        c = c * D / (_x * N_COINS)
    c = c * D * A_PRECISION / (Ann * N_COINS)
    b: uint256 = S_ + D * A_PRECISION / Ann
    y: uint256 = D

    for _i in range(255):
        y_prev = y
        y = (y*y + c) / (2 * y + b - D)
        # Equality with the precision of 1
        if y > y_prev:
            if y - y_prev <= 1:
                return y
        else:
            if y_prev - y <= 1:
                return y
    raise


@view
@internal
def _calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> (uint256, uint256):
    # First, need to calculate
    # * Get current D
    # * Solve Eqn against y_i for D - _token_amount
    amp: uint256 = self._A()
    xp: uint256[N_COINS] = self._balances()
    D0: uint256 = self.get_D(xp, amp)
    total_supply: uint256 = ERC20(self.lp_token).totalSupply()
    D1: uint256 = D0 - _token_amount * D0 / total_supply
    new_y: uint256 = self.get_y_D(amp, i, xp, D1)

    fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    xp_reduced: uint256[N_COINS] = xp
    for j in range(N_COINS):
        dx_expected: uint256 = 0
        if j == i:
            dx_expected = xp[j] * D1 / D0 - new_y
        else:
            dx_expected = xp[j] - xp[j] * D1 / D0
        xp_reduced[j] -= fee * dx_expected / FEE_DENOMINATOR

    dy: uint256 = xp_reduced[i] - self.get_y_D(amp, i, xp_reduced, D1)

    dy -= 1  # Withdraw less to account for rounding errors
    dy_0: uint256 = xp[i] - new_y  # w/o fees

    return dy, dy_0 - dy


@view
@external
def calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> uint256:
    """
    @notice Calculate the amount received when withdrawing a single coin
    @dev Result is the same for underlying or wrapped asset withdrawals
    @param _token_amount Amount of LP tokens to burn in the withdrawal
    @param i Index value of the coin to withdraw
    @return Amount of coin received
    """
    return self._calc_withdraw_one_coin(_token_amount, i)[0]


@external
@nonreentrant('lock')
def remove_liquidity_one_coin(
    _token_amount: uint256,
    i: int128,
    _min_amount: uint256
) -> uint256:
    """
    @notice Withdraw a single coin from the pool
    @param _token_amount Amount of LP tokens to burn in the withdrawal
    @param i Index value of the coin to withdraw
    @param _min_amount Minimum amount of coin to receive
    @return Amount of coin received
    """
    assert not self.is_killed  # dev: is killed

    dy: uint256 = 0
    dy_fee: uint256 = 0
    dy, dy_fee = self._calc_withdraw_one_coin(_token_amount, i)

    assert dy >= _min_amount, "Not enough coins removed"

    self.admin_balances[i] += dy_fee * self.admin_fee / FEE_DENOMINATOR

    CurveToken(self.lp_token).burnFrom(msg.sender, _token_amount)  # dev: insufficient funds

    if i == 0:
        raw_call(msg.sender, b"", value=dy)
    else:
        assert ERC20(self.coins[1]).transfer(msg.sender, dy)

    log RemoveLiquidityOne(msg.sender, _token_amount, dy)

    return dy


### Admin functions ###

@external
def ramp_A(_future_A: uint256, _future_time: uint256):
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.initial_A_time + MIN_RAMP_TIME
    assert _future_time >= block.timestamp + MIN_RAMP_TIME  # dev: insufficient time

    _initial_A: uint256 = self._A()
    _future_A_p: uint256 = _future_A * A_PRECISION

    assert _future_A > 0 and _future_A < MAX_A
    if _future_A_p < _initial_A:
        assert _future_A_p * MAX_A_CHANGE >= _initial_A
    else:
        assert _future_A_p <= _initial_A * MAX_A_CHANGE

    self.initial_A = _initial_A
    self.future_A = _future_A_p
    self.initial_A_time = block.timestamp
    self.future_A_time = _future_time

    log RampA(_initial_A, _future_A_p, block.timestamp, _future_time)


@external
def stop_ramp_A():
    assert msg.sender == self.owner  # dev: only owner

    current_A: uint256 = self._A()
    self.initial_A = current_A
    self.future_A = current_A
    self.initial_A_time = block.timestamp
    self.future_A_time = block.timestamp
    # now (block.timestamp < t1) is always False, so we return saved A

    log StopRampA(current_A, block.timestamp)


@external
def commit_new_fee(new_fee: uint256, new_admin_fee: uint256):
    assert msg.sender == self.owner  # dev: only owner
    assert self.admin_actions_deadline == 0  # dev: active action
    assert new_fee <= MAX_FEE  # dev: fee exceeds maximum
    assert new_admin_fee <= MAX_ADMIN_FEE  # dev: admin fee exceeds maximum

    _deadline: uint256 = block.timestamp + ADMIN_ACTIONS_DELAY
    self.admin_actions_deadline = _deadline
    self.future_fee = new_fee
    self.future_admin_fee = new_admin_fee

    log CommitNewFee(_deadline, new_fee, new_admin_fee)


@external
@nonreentrant('lock')
def apply_new_fee():
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.admin_actions_deadline  # dev: insufficient time
    assert self.admin_actions_deadline != 0  # dev: no active action

    self.admin_actions_deadline = 0
    _fee: uint256 = self.future_fee
    _admin_fee: uint256 = self.future_admin_fee
    self.fee = _fee
    self.admin_fee = _admin_fee

    log NewFee(_fee, _admin_fee)


@external
def revert_new_parameters():
    assert msg.sender == self.owner  # dev: only owner

    self.admin_actions_deadline = 0


@external
def commit_transfer_ownership(_owner: address):
    assert msg.sender == self.owner  # dev: only owner
    assert self.transfer_ownership_deadline == 0  # dev: active transfer

    _deadline: uint256 = block.timestamp + ADMIN_ACTIONS_DELAY
    self.transfer_ownership_deadline = _deadline
    self.future_owner = _owner

    log CommitNewAdmin(_deadline, _owner)


@external
@nonreentrant('lock')
def apply_transfer_ownership():
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.transfer_ownership_deadline  # dev: insufficient time
    assert self.transfer_ownership_deadline != 0  # dev: no active transfer

    self.transfer_ownership_deadline = 0
    _owner: address = self.future_owner
    self.owner = _owner

    log NewAdmin(_owner)


@external
def revert_transfer_ownership():
    assert msg.sender == self.owner  # dev: only owner

    self.transfer_ownership_deadline = 0


@external
@nonreentrant('lock')
def withdraw_admin_fees():
    assert msg.sender == self.owner  # dev: only owner

    amount: uint256 = self.admin_balances[0]
    if amount != 0:
        raw_call(msg.sender, b"", value=amount)

    amount = self.admin_balances[1]
    if amount != 0:
        assert ERC20(self.coins[1]).transfer(msg.sender, amount)

    self.admin_balances = empty(uint256[N_COINS])


@external
def donate_admin_fees():
    """
    Just in case admin balances somehow become higher than total (rounding error?)
    this can be used to fix the state, too
    """
    assert msg.sender == self.owner  # dev: only owner
    self.admin_balances = empty(uint256[N_COINS])


@external
def kill_me():
    assert msg.sender == self.owner  # dev: only owner
    assert self.kill_deadline > block.timestamp  # dev: deadline has passed
    self.is_killed = True


@external
def unkill_me():
    assert msg.sender == self.owner  # dev: only owner
    self.is_killed = False

Contract Security Audit

Contract ABI

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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.