Contract 0x7da64233fefb352f8f501b357c018158ed8aa455 1

 
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0xf70971d3ba6ca6f933338eb5f8847d09353bb872346f514d998673211a652e930x617a696014021282021-09-21 11:02:32437 days 16 hrs ago0x7eeac6cddbd1d0b8af061742d41877d7f707289a IN  Create: Vyper_contract0 ETH0.097424365214 ETH
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0x0e1208781d04ebf3f4da143e314748c1c50188613bf75a3599994f425391e3f9430591872022-12-02 18:49:438 hrs 17 mins ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0xcae16e5228859600c9d9395dbbb5aaaa4b0ef6ad30e724e6e325bd1978a78447430556582022-12-02 18:31:278 hrs 35 mins ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x2849fa29167d4518c87ca4658f910ea16edc41e33e9928c1d5cf58f9259320b1429947772022-12-02 13:39:5213 hrs 27 mins ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x218123a4ade89714b9781f5e56227af4e507c040df2e699862190ac3d2cdb8e2428431692022-12-02 0:38:371 day 2 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0xc1cad5a2efd7ad94296d0a92f13c31ac2329be2c23c94b55a24df207adea1c20426130092022-12-01 4:47:411 day 22 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
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0xa5752a1798cdc554b16cfb883e92982d13e79f58aa54c6e58054ad8aa3ad508b425035372022-11-30 17:45:362 days 9 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
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0x841a9233ac318133eff134d0bd2ce24d2f5c14fb412e7012b785d24961d6733c424504782022-11-30 13:44:162 days 13 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x76f3fafc6218679fcd8a6ebb01c71ce4de902072a91b5781cf58e46a47f0273d424504702022-11-30 13:44:142 days 13 hrs ago 0xc120ef573752aad82484ebc9a752dad6f3fec54b 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x563729941f0a7ab73377a74056b6835eda948344f1cd40122fadaebdb8c691b9424224652022-11-30 11:32:532 days 15 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x37e4997ce62a92cb606f70e696135497376f5bece6b95acf3ea65bae63d0aebd424093492022-11-30 10:28:332 days 16 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x29b869d958d3b930bbf1ddd1efe7f9e92448ce4c2e32434c4a0aa2f0180524a2423983822022-11-30 9:35:422 days 17 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x897a31dc5823c53ddd3f402cadb5302ef2c64f22c7c540d98763aee1c708cdaf423930982022-11-30 9:10:132 days 17 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x7e737610b6eef8e2ad8940ebf82f172a86db2398774693d81615da04d0b6eef2423756162022-11-30 7:45:322 days 19 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x41129d2a5ec41788a1ba8f8f9c3543ee29901850abb6356c1204f27129e9bc24423657962022-11-30 6:55:032 days 20 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x0bc41c44989557739b32b942dfc915fe9cd09f3bc50a90eed50e1add1bf568fc423654672022-11-30 6:53:132 days 20 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x7f16e42fe87df83e5cc6b56e077a75206233e46a4c3049a1f9df0bcd2901ace0423418912022-11-30 4:34:582 days 22 hrs ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x059062288e1c70f041c821b669f47a782bbe32910582bac945329066405acc52423146222022-11-30 1:53:153 days 1 hr ago 0x0a824b5d4c96ea0ec46306efbd34bf88fe1277e0 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0xf4d05c5cf64333bfc2c095663a8b046aba11e5167d4966fb58185c313df9d860422474272022-11-29 19:50:193 days 7 hrs ago 0x305fc0a3eed959a3bbdc54300a1a140925b4b058 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x5a46ba9925fc53c0f58c6becb46eeac7bd585e97d709ef7ffb20348e07b7731e422437592022-11-29 19:31:273 days 7 hrs ago 0x305fc0a3eed959a3bbdc54300a1a140925b4b058 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x185e99978abfab93d3dc94e388153a2cd964755c03af7d4f1e7240df32603dec422434592022-11-29 19:29:513 days 7 hrs ago 0xd39016475200ab8957e9c772c949ef54bda69111 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x15d1dffd3ae4fa3101dcda0ba88f9a899ad766e849355f367bb1e2ec5c8365ca422432472022-11-29 19:28:473 days 7 hrs ago 0x305fc0a3eed959a3bbdc54300a1a140925b4b058 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
0x8af44f886f2e488a79ef6021e492140e749572c7a928396a2ea8ba7aa99aa7e2421759552022-11-29 14:17:423 days 12 hrs ago 0xd39016475200ab8957e9c772c949ef54bda69111 0x7da64233fefb352f8f501b357c018158ed8aa4550 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Vyper_contract

Compiler Version
vyper:0.2.15

Optimization Enabled:
N/A

Other Settings:
, None license

Contract Source Code (Vyper language format)

# @version 0.2.15
"""
@title StableSwap
@author Curve.Fi
@license Copyright (c) Curve.Fi, 2020-2021 - all rights reserved
@notice 2 coin pool implementation with no lending
@dev ERC20 support for return True/revert, return True/False, return None
     Uses native Ether as coins[0]
"""

from vyper.interfaces import ERC20

interface Factory:
    def convert_fees() -> bool: nonpayable
    def get_fee_receiver(_pool: address) -> address: view
    def admin() -> address: view


event Transfer:
    sender: indexed(address)
    receiver: indexed(address)
    value: uint256

event Approval:
    owner: indexed(address)
    spender: indexed(address)
    value: uint256

event TokenExchange:
    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
    token_supply: uint256

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

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

event StopRampA:
    A: uint256
    t: uint256


N_COINS: constant(int128) = 2
PRECISION: constant(uint256) = 10 ** 18

FEE_DENOMINATOR: constant(uint256) = 10 ** 10
ADMIN_FEE: constant(uint256) = 5000000000

A_PRECISION: constant(uint256) = 100
MAX_A: constant(uint256) = 10 ** 6
MAX_A_CHANGE: constant(uint256) = 10
MIN_RAMP_TIME: constant(uint256) = 86400

factory: address

coins: public(address[N_COINS])
balances: public(uint256[N_COINS])
fee: public(uint256)  # fee * 1e10

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

rate_multipliers: uint256[N_COINS]

name: public(String[64])
symbol: public(String[32])

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


@external
def __init__():
    # we do this to prevent the implementation contract from being used as a pool
    self.fee = 31337


@external
def initialize(
    _name: String[32],
    _symbol: String[10],
    _coins: address[4],
    _rate_multipliers: uint256[4],
    _A: uint256,
    _fee: uint256,
):
    """
    @notice Contract constructor
    @param _name Name of the new pool
    @param _symbol Token symbol
    @param _coins List of all ERC20 conract addresses of coins
    @param _rate_multipliers List of number of decimals in coins
    @param _A Amplification coefficient multiplied by n ** (n - 1)
    @param _fee Fee to charge for exchanges
    """
    # check if fee was already set to prevent initializing contract twice
    assert self.fee == 0

    # additional sanity checks for ETH configuration
    assert _coins[0] == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
    assert _rate_multipliers[0] == 10**18

    for i in range(N_COINS):
        coin: address = _coins[i]
        if coin == ZERO_ADDRESS:
            break
        self.coins[i] = coin
        self.rate_multipliers[i] = _rate_multipliers[i]

    A: uint256 = _A * A_PRECISION
    self.initial_A = A
    self.future_A = A
    self.fee = _fee
    self.factory = msg.sender

    self.name = concat("Curve.fi Factory Pool: ", _name)
    self.symbol = concat(_symbol, "-f")

    # fire a transfer event so block explorers identify the contract as an ERC20
    log Transfer(ZERO_ADDRESS, self, 0)


### ERC20 Functionality ###

@view
@external
def decimals() -> uint256:
    """
    @notice Get the number of decimals for this token
    @dev Implemented as a view method to reduce gas costs
    @return uint256 decimal places
    """
    return 18


@internal
def _transfer(_from: address, _to: address, _value: uint256):
    # # NOTE: vyper does not allow underflows
    # #       so the following subtraction would revert on insufficient balance
    self.balanceOf[_from] -= _value
    self.balanceOf[_to] += _value

    log Transfer(_from, _to, _value)


@external
def transfer(_to : address, _value : uint256) -> bool:
    """
    @dev Transfer token for a specified address
    @param _to The address to transfer to.
    @param _value The amount to be transferred.
    """
    self._transfer(msg.sender, _to, _value)
    return True


@external
def transferFrom(_from : address, _to : address, _value : uint256) -> bool:
    """
     @dev Transfer tokens from one address to another.
     @param _from address The address which you want to send tokens from
     @param _to address The address which you want to transfer to
     @param _value uint256 the amount of tokens to be transferred
    """
    self._transfer(_from, _to, _value)

    _allowance: uint256 = self.allowance[_from][msg.sender]
    if _allowance != MAX_UINT256:
        self.allowance[_from][msg.sender] = _allowance - _value

    return True


@external
def approve(_spender : address, _value : uint256) -> bool:
    """
    @notice Approve the passed address to transfer the specified amount of
            tokens on behalf of msg.sender
    @dev Beware that changing an allowance via this method brings the risk that
         someone may use both the old and new allowance by unfortunate transaction
         ordering: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    @param _spender The address which will transfer the funds
    @param _value The amount of tokens that may be transferred
    @return bool success
    """
    self.allowance[msg.sender][_spender] = _value

    log Approval(msg.sender, _spender, _value)
    return True


### StableSwap Functionality ###

@view
@external
def get_balances() -> uint256[N_COINS]:
    return self.balances


@view
@internal
def _A() -> uint256:
    """
    Handle ramping A up or down
    """
    t1: uint256 = self.future_A_time
    A1: uint256 = self.future_A

    if block.timestamp < t1:
        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 admin_fee() -> uint256:
    return ADMIN_FEE


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


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


@pure
@internal
def _xp_mem(_rates: uint256[N_COINS], _balances: uint256[N_COINS]) -> uint256[N_COINS]:
    result: uint256[N_COINS] = empty(uint256[N_COINS])
    for i in range(N_COINS):
        result[i] = _rates[i] * _balances[i] / PRECISION
    return result


@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
    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 * D / _xp[0] * D / _xp[1] / (N_COINS)**2
        Dprev: uint256 = 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
@internal
def get_D_mem(_rates: uint256[N_COINS], _balances: uint256[N_COINS], _amp: uint256) -> uint256:
    xp: uint256[N_COINS] = self._xp_mem(_rates, _balances)
    return self.get_D(xp, _amp)


@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
    """
    amp: uint256 = self._A()
    xp: uint256[N_COINS] = self._xp_mem(self.rate_multipliers, self.balances)
    D: uint256 = self.get_D(xp, amp)
    # 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
    return D * PRECISION / self.totalSupply


@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_mem(self.rate_multipliers, balances, amp)
    for i in range(N_COINS):
        amount: uint256 = _amounts[i]
        if _is_deposit:
            balances[i] += amount
        else:
            balances[i] -= amount
    D1: uint256 = self.get_D_mem(self.rate_multipliers, balances, amp)
    diff: uint256 = 0
    if _is_deposit:
        diff = D1 - D0
    else:
        diff = D0 - D1
    return diff * self.totalSupply / D0


@payable
@external
@nonreentrant('lock')
def add_liquidity(
    _amounts: uint256[N_COINS],
    _min_mint_amount: uint256,
    _receiver: address = msg.sender
) -> 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
    @param _receiver Address that owns the minted LP tokens
    @return Amount of LP tokens received by depositing
    """
    amp: uint256 = self._A()
    old_balances: uint256[N_COINS] = self.balances
    rates: uint256[N_COINS] = self.rate_multipliers

    # Initial invariant
    D0: uint256 = self.get_D_mem(rates, old_balances, amp)

    total_supply: uint256 = self.totalSupply
    new_balances: uint256[N_COINS] = old_balances
    for i in range(N_COINS):
        amount: uint256 = _amounts[i]
        if total_supply == 0:
            assert amount > 0  # dev: initial deposit requires all coins
        new_balances[i] += amount

    # Invariant after change
    D1: uint256 = self.get_D_mem(rates, 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
    if total_supply > 0:
        # Only account for fees if we are not the first to deposit
        base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
        for i in range(N_COINS):
            ideal_balance: uint256 = D1 * old_balances[i] / D0
            difference: uint256 = 0
            new_balance: uint256 = new_balances[i]
            if ideal_balance > new_balance:
                difference = ideal_balance - new_balance
            else:
                difference = new_balance - ideal_balance
            fees[i] = base_fee * difference / FEE_DENOMINATOR
            self.balances[i] = new_balance - (fees[i] * ADMIN_FEE / FEE_DENOMINATOR)
            new_balances[i] -= fees[i]
        D2: uint256 = self.get_D_mem(rates, new_balances, amp)
        mint_amount = total_supply * (D2 - D0) / D0
    else:
        self.balances = new_balances
        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:
        response: Bytes[32] = raw_call(
            self.coins[1],
            concat(
                method_id("transferFrom(address,address,uint256)"),
                convert(msg.sender, bytes32),
                convert(self, bytes32),
                convert(_amounts[1], bytes32),
            ),
            max_outsize=32,
        )
        if len(response) > 0:
            assert convert(response, bool)  # dev: failed transfer
        # end "safeTransferFrom"

    # Mint pool tokens
    total_supply += mint_amount
    self.balanceOf[_receiver] += mint_amount
    self.totalSupply = total_supply
    log Transfer(ZERO_ADDRESS, _receiver, mint_amount)

    log AddLiquidity(msg.sender, _amounts, fees, D1, total_supply)

    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 + x_1 * (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)
    S_: uint256 = 0
    _x: uint256 = 0
    y_prev: uint256 = 0
    c: uint256 = D
    Ann: uint256 = amp * N_COINS

    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:
    """
    @notice Calculate the current output dy given input dx
    @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
    @return Amount of `j` predicted
    """
    rates: uint256[N_COINS] = self.rate_multipliers
    xp: uint256[N_COINS] = self._xp_mem(rates, self.balances)

    x: uint256 = xp[i] + (dx * rates[i] / PRECISION)
    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) * PRECISION / rates[j]


@payable
@external
@nonreentrant('lock')
def exchange(
    i: int128,
    j: int128,
    _dx: uint256,
    _min_dy: uint256,
    _receiver: address = msg.sender,
) -> 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
    """
    rates: uint256[N_COINS] = self.rate_multipliers
    old_balances: uint256[N_COINS] = self.balances
    xp: uint256[N_COINS] = self._xp_mem(rates, old_balances)

    x: uint256 = xp[i] + _dx * rates[i] / PRECISION
    y: uint256 = self.get_y(i, j, x, xp)

    dy: uint256 = xp[j] - y - 1  # -1 just in case there were some rounding errors
    dy_fee: uint256 = dy * self.fee / FEE_DENOMINATOR

    # Convert all to real units
    dy = (dy - dy_fee) * PRECISION / rates[j]
    assert dy >= _min_dy, "Exchange resulted in fewer coins than expected"

    dy_admin_fee: uint256 = dy_fee * ADMIN_FEE / FEE_DENOMINATOR
    dy_admin_fee = dy_admin_fee * PRECISION / rates[j]

    # Change balances exactly in same way as we change actual ERC20 coin amounts
    self.balances[i] = old_balances[i] + _dx
    # When rounding errors happen, we undercharge admin fee in favor of LP
    self.balances[j] = old_balances[j] - dy - dy_admin_fee

    coin: address = self.coins[1]
    if i == 0:
        assert msg.value == _dx
        response: Bytes[32] = raw_call(
            coin,
            concat(
                method_id("transfer(address,uint256)"),
                convert(_receiver, bytes32),
                convert(dy, bytes32),
            ),
            max_outsize=32,
        )
        if len(response) > 0:
            assert convert(response, bool)
    else:
        assert msg.value == 0
        response: Bytes[32] = raw_call(
            coin,
            concat(
                method_id("transferFrom(address,address,uint256)"),
                convert(msg.sender, bytes32),
                convert(self, bytes32),
                convert(_dx, bytes32),
            ),
            max_outsize=32,
        )
        if len(response) > 0:
            assert convert(response, bool)
        raw_call(_receiver, b"", value=dy)

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

    return dy


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

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

        if i == 0:
            raw_call(_receiver, b"", value=value)
        else:
            response: Bytes[32] = raw_call(
                self.coins[1],
                concat(
                    method_id("transfer(address,uint256)"),
                    convert(_receiver, bytes32),
                    convert(value, bytes32),
                ),
                max_outsize=32,
            )
            if len(response) > 0:
                assert convert(response, bool)

    total_supply -= _burn_amount
    self.balanceOf[msg.sender] -= _burn_amount
    self.totalSupply = total_supply
    log Transfer(msg.sender, ZERO_ADDRESS, _burn_amount)

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

    return amounts


@external
@nonreentrant('lock')
def remove_liquidity_imbalance(
    _amounts: uint256[N_COINS],
    _max_burn_amount: uint256,
    _receiver: address = msg.sender
) -> 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
    @param _receiver Address that receives the withdrawn coins
    @return Actual amount of the LP token burned in the withdrawal
    """
    amp: uint256 = self._A()
    rates: uint256[N_COINS] = self.rate_multipliers
    old_balances: uint256[N_COINS] = self.balances
    D0: uint256 = self.get_D_mem(rates, 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_mem(rates, new_balances, amp)

    fees: uint256[N_COINS] = empty(uint256[N_COINS])
    base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    for i in range(N_COINS):
        ideal_balance: uint256 = D1 * old_balances[i] / D0
        difference: uint256 = 0
        new_balance: uint256 = new_balances[i]
        if ideal_balance > new_balance:
            difference = ideal_balance - new_balance
        else:
            difference = new_balance - ideal_balance
        fees[i] = base_fee * difference / FEE_DENOMINATOR
        self.balances[i] = new_balance - (fees[i] * ADMIN_FEE / FEE_DENOMINATOR)
        new_balances[i] -= fees[i]
    D2: uint256 = self.get_D_mem(rates, new_balances, amp)

    total_supply: uint256 = self.totalSupply
    burn_amount: uint256 = ((D0 - D2) * total_supply / D0) + 1
    assert burn_amount > 1  # dev: zero tokens burned
    assert burn_amount <= _max_burn_amount, "Slippage screwed you"

    total_supply -= burn_amount
    self.totalSupply = total_supply
    self.balanceOf[msg.sender] -= burn_amount
    log Transfer(msg.sender, ZERO_ADDRESS, burn_amount)

    if _amounts[0] != 0:
        raw_call(_receiver, b"", value=_amounts[0])
    if _amounts[1] != 0:
        response: Bytes[32] = raw_call(
            self.coins[1],
            concat(
                method_id("transfer(address,uint256)"),
                convert(_receiver, bytes32),
                convert(_amounts[1], bytes32),
            ),
            max_outsize=32,
        )
        if len(response) > 0:
            assert convert(response, bool)

    log RemoveLiquidityImbalance(msg.sender, _amounts, fees, D1, total_supply)

    return burn_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 + x_1 * (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

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

    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(_burn_amount: uint256, i: int128) -> uint256[2]:
    # First, need to calculate
    # * Get current D
    # * Solve Eqn against y_i for D - _token_amount
    amp: uint256 = self._A()
    rates: uint256[N_COINS] = self.rate_multipliers
    xp: uint256[N_COINS] = self._xp_mem(rates, self.balances)
    D0: uint256 = self.get_D(xp, amp)

    total_supply: uint256 = self.totalSupply
    D1: uint256 = D0 - _burn_amount * D0 / total_supply
    new_y: uint256 = self.get_y_D(amp, i, xp, D1)

    base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    xp_reduced: uint256[N_COINS] = empty(uint256[N_COINS])

    for j in range(N_COINS):
        dx_expected: uint256 = 0
        xp_j: uint256 = xp[j]
        if j == i:
            dx_expected = xp_j * D1 / D0 - new_y
        else:
            dx_expected = xp_j - xp_j * D1 / D0
        xp_reduced[j] = xp_j - base_fee * dx_expected / FEE_DENOMINATOR

    dy: uint256 = xp_reduced[i] - self.get_y_D(amp, i, xp_reduced, D1)
    dy_0: uint256 = (xp[i] - new_y) * PRECISION / rates[i]  # w/o fees
    dy = (dy - 1) * PRECISION / rates[i]  # Withdraw less to account for rounding errors

    return [dy, dy_0 - dy]


@view
@external
def calc_withdraw_one_coin(_burn_amount: uint256, i: int128) -> uint256:
    """
    @notice Calculate the amount received when withdrawing a single coin
    @param _burn_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(_burn_amount, i)[0]


@external
@nonreentrant('lock')
def remove_liquidity_one_coin(
    _burn_amount: uint256,
    i: int128,
    _min_received: uint256,
    _receiver: address = msg.sender,
) -> uint256:
    """
    @notice Withdraw a single coin from the pool
    @param _burn_amount Amount of LP tokens to burn in the withdrawal
    @param i Index value of the coin to withdraw
    @param _min_received Minimum amount of coin to receive
    @param _receiver Address that receives the withdrawn coins
    @return Amount of coin received
    """
    dy: uint256[2] = self._calc_withdraw_one_coin(_burn_amount, i)
    assert dy[0] >= _min_received, "Not enough coins removed"

    self.balances[i] -= (dy[0] + dy[1] * ADMIN_FEE / FEE_DENOMINATOR)
    total_supply: uint256 = self.totalSupply - _burn_amount
    self.totalSupply = total_supply
    self.balanceOf[msg.sender] -= _burn_amount
    log Transfer(msg.sender, ZERO_ADDRESS, _burn_amount)

    if i == 0:
        raw_call(_receiver, b"", value=dy[0])
    else:
        response: Bytes[32] = raw_call(
            self.coins[1],
            concat(
                method_id("transfer(address,uint256)"),
                convert(_receiver, bytes32),
                convert(dy[0], bytes32),
            ),
            max_outsize=32,
        )
        if len(response) > 0:
            assert convert(response, bool)

    log RemoveLiquidityOne(msg.sender, _burn_amount, dy[0], total_supply)

    return dy[0]


@external
def ramp_A(_future_A: uint256, _future_time: uint256):
    assert msg.sender == Factory(self.factory).admin()  # 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 == Factory(self.factory).admin()  # 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)


@view
@external
def admin_balances(i: uint256) -> uint256:
    if i == 0:
        return self.balance - self.balances[0]
    else:
        return ERC20(self.coins[i]).balanceOf(self) - self.balances[i]


@external
def withdraw_admin_fees():
    receiver: address = Factory(self.factory).get_fee_receiver(self)

    fees: uint256 = self.balance - self.balances[0]
    raw_call(receiver, b"", value=fees)

    coin: address = self.coins[1]
    fees = ERC20(coin).balanceOf(self) - self.balances[1]
    raw_call(
    coin,
    concat(
        method_id("transfer(address,uint256)"),
        convert(receiver, bytes32),
        convert(fees, bytes32)
    )
)

Contract ABI

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