ETH Price: $2,694.83 (-1.76%)

Contract

0xDC24316b9AE028F1497c275EB9192a3Ea0f67022
 

Overview

ETH Balance

24,770.516462454714696532 ETH

Eth Value

$66,752,361.84 (@ $2,694.83/ETH)

Token Holdings

Multichain Info

1 address found via
Transaction Hash
Method
Block
From
To
Remove_liquidity...218527402025-02-15 15:32:5953 mins ago1739633579IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.00011230.88213533
Remove_liquidity...218515512025-02-15 11:32:354 hrs ago1739619155IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000114470.9
Remove_liquidity...218510892025-02-15 9:59:116 hrs ago1739613551IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000104430.82120478
Exchange218507272025-02-15 8:45:597 hrs ago1739609159IN
Lido: Curve Liquidity Farming Pool Contract
214 ETH0.00009850.83199079
Exchange218457502025-02-14 15:59:4724 hrs ago1739548787IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000285662.25065146
Exchange218450562025-02-14 13:40:1126 hrs ago1739540411IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000270382.13029057
Add_liquidity218448792025-02-14 13:04:3527 hrs ago1739538275IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000153970.9089885
Remove_liquidity...218442232025-02-14 10:51:4729 hrs ago1739530307IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000113740.89427102
Add_liquidity218406762025-02-13 22:56:3541 hrs ago1739487395IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000272192.01792367
Remove_liquidity218406322025-02-13 22:47:4741 hrs ago1739486867IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000200011.93917559
Remove_liquidity218386432025-02-13 16:07:112 days ago1739462831IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000478274.12324474
Exchange218385862025-02-13 15:55:472 days ago1739462147IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000440243.46925548
Remove_liquidity...218381422025-02-13 14:25:232 days ago1739456723IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000376432.96013152
Exchange218380862025-02-13 14:14:112 days ago1739456051IN
Lido: Curve Liquidity Farming Pool Contract
32.2 ETH0.000343362.9
Remove_liquidity...218370942025-02-13 10:53:592 days ago1739444039IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000114530.90065396
Remove_liquidity...218369552025-02-13 10:26:112 days ago1739442371IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.00012410.97594484
Exchange218366322025-02-13 9:21:112 days ago1739438471IN
Lido: Curve Liquidity Farming Pool Contract
10 ETH0.000195341.44769187
Exchange218364762025-02-13 8:49:472 days ago1739436587IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000132841.04668128
Exchange218359182025-02-13 6:57:112 days ago1739429831IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000433683.41691181
Remove_liquidity...218341502025-02-13 1:01:112 days ago1739408471IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000161181.26754083
Exchange218339972025-02-13 0:30:232 days ago1739406623IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.00012861.01325923
Exchange218324862025-02-12 19:27:232 days ago1739388443IN
Lido: Curve Liquidity Farming Pool Contract
214 ETH0.000185071.57030552
Remove_liquidity218317512025-02-12 16:59:352 days ago1739379575IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000368493.17678404
Exchange218312362025-02-12 15:15:473 days ago1739373347IN
Lido: Curve Liquidity Farming Pool Contract
393 ETH0.000258362.19214399
Exchange218309972025-02-12 14:27:353 days ago1739370455IN
Lido: Curve Liquidity Farming Pool Contract
0 ETH0.000444593.36468308
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Latest 25 internal transactions (View All)

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Parent Transaction Hash Block
From
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218529692025-02-15 16:19:117 mins ago1739636351
Lido: Curve Liquidity Farming Pool Contract
9.99807826 ETH
218529092025-02-15 16:07:1119 mins ago1739635631
Lido: Curve Liquidity Farming Pool Contract
0.03690692 ETH
218528962025-02-15 16:04:3522 mins ago1739635475
Lido: Curve Liquidity Farming Pool Contract
0.03690692 ETH
218528912025-02-15 16:03:3523 mins ago1739635415
Lido: Curve Liquidity Farming Pool Contract
10.55798009 ETH
218528742025-02-15 16:00:1126 mins ago1739635211
Lido: Curve Liquidity Farming Pool Contract
38.78546319 ETH
218528682025-02-15 15:58:5927 mins ago1739635139
Lido: Curve Liquidity Farming Pool Contract
0.02999437 ETH
218528442025-02-15 15:54:1132 mins ago1739634851
Lido: Curve Liquidity Farming Pool Contract
0.00105234 ETH
218528182025-02-15 15:48:4737 mins ago1739634527
Lido: Curve Liquidity Farming Pool Contract
0.06098856 ETH
218527982025-02-15 15:44:4741 mins ago1739634287
Lido: Curve Liquidity Farming Pool Contract
8.60860841 ETH
218527962025-02-15 15:44:2342 mins ago1739634263
Lido: Curve Liquidity Farming Pool Contract
61.8270428 ETH
218527902025-02-15 15:43:1143 mins ago1739634191
Lido: Curve Liquidity Farming Pool Contract
0.03428113 ETH
218527722025-02-15 15:39:3547 mins ago1739633975
Lido: Curve Liquidity Farming Pool Contract
0.03428113 ETH
218527632025-02-15 15:37:3549 mins ago1739633855
Lido: Curve Liquidity Farming Pool Contract
0.04449138 ETH
218527462025-02-15 15:34:1152 mins ago1739633651
Lido: Curve Liquidity Farming Pool Contract
0.04499129 ETH
218527402025-02-15 15:32:5953 mins ago1739633579
Lido: Curve Liquidity Farming Pool Contract
3.41705315 ETH
218526622025-02-15 15:17:231 hr ago1739632643
Lido: Curve Liquidity Farming Pool Contract
0.03279365 ETH
218526382025-02-15 15:12:351 hr ago1739632355
Lido: Curve Liquidity Farming Pool Contract
0.03229375 ETH
218524832025-02-15 14:40:591 hr ago1739630459
Lido: Curve Liquidity Farming Pool Contract
0.03509321 ETH
218524832025-02-15 14:40:591 hr ago1739630459
Lido: Curve Liquidity Farming Pool Contract
0.26994778 ETH
218523482025-02-15 14:13:472 hrs ago1739628827
Lido: Curve Liquidity Farming Pool Contract
0.98941606 ETH
218523242025-02-15 14:08:592 hrs ago1739628539
Lido: Curve Liquidity Farming Pool Contract
0.03493224 ETH
218523162025-02-15 14:07:232 hrs ago1739628443
Lido: Curve Liquidity Farming Pool Contract
4.94473552 ETH
218523072025-02-15 14:05:352 hrs ago1739628335
Lido: Curve Liquidity Farming Pool Contract
17.49001797 ETH
218522742025-02-15 13:58:472 hrs ago1739627927
Lido: Curve Liquidity Farming Pool Contract
0.1996361 ETH
218521272025-02-15 13:29:112 hrs ago1739626151
Lido: Curve Liquidity Farming Pool Contract
13.43548804 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x32fb6b59...6FF3F4906
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:
default evmVersion, 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.