Contract 0xDC24316b9AE028F1497c275EB9192a3Ea0f67022 10

Lido 
 
 
Txn Hash
Method
Block
From
To
Value
0xcd2b7f478c5fbe2cdcdc6a42d8027159b5f9e6b3c8bf03cf5ece4cd786d95692Exchange152974142022-08-07 20:38:411 hr 13 mins ago0xcb26dfc9855ce5a69534eb8319271f11b7610f67 IN  Lido: Curve Liquidity Farming Pool Contract50 Ether0.000849597
0x582b27ee4c6bec4cbefe1ae3fe924d97f33c838f55983cf0f920644b6d0ded8bAdd_liquidity152971432022-08-07 19:39:292 hrs 13 mins ago0xe4ade48b4d05871fb944baf471c8c90400b13bce IN  Lido: Curve Liquidity Farming Pool Contract2 Ether0.0024104 16.00193625
0xe1ebbfbc27bc227d46e40a6e50467d21d992e92cdd18c53516ae5dad40fbd0fdRemove_liquidity...152971242022-08-07 19:35:002 hrs 17 mins ago0x131c71e79b62c38df5123bd89559577e3abbdce7 IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00177843 13.59813756
0x19ac195ad04351f894ffbd1d70d497fa3bf1a93cedbe7fe8e20508840760d5b0Add_liquidity152970882022-08-07 19:26:352 hrs 26 mins ago0x131c71e79b62c38df5123bd89559577e3abbdce7 IN  Lido: Curve Liquidity Farming Pool Contract2 Ether0.00177251 11.76717188
0x2ac34e4220980ff6ec18596f0d956da35d8d0e795075f028a8d9e050ff75aa4cAdd_liquidity152967562022-08-07 18:14:113 hrs 38 mins ago0xc9d11e891c31b39a7f3481192dddd97dc1f69948 IN  Lido: Curve Liquidity Farming Pool Contract102.6 Ether0.00124209 8.24457339
0xa95609c0bca4711d3d916472479b63c19c207c14ab564fd8a33088f7b0bd33daAdd_liquidity152965652022-08-07 17:30:534 hrs 21 mins ago0xc9d11e891c31b39a7f3481192dddd97dc1f69948 IN  Lido: Curve Liquidity Farming Pool Contract0.9 Ether0.00494688 32.84087396
0x84f1a6e810527be49d3cac61076cabc3ec8d7a15d9d45fdc9efe84a1f74fed4cRemove_liquidity152965542022-08-07 17:27:584 hrs 24 mins ago0xff17a891c6ca64ba5847b138e46b9859fd9cd9de IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00313899 26.59918084
0xbeb067e36381b3f283806d61bdb11823b24a4301b50f683372917e242c53495bAdd_liquidity152965342022-08-07 17:22:214 hrs 30 mins ago0xdf3c8e63677c79b24608bded80ced65667513bcb IN  Lido: Curve Liquidity Farming Pool Contract74.6 Ether0.0037393 20.6633723
0x910f30495087ea9439d8a7444c86eff05a712f85b9907b6c390ba20dd27bb87bExchange152964842022-08-07 17:10:354 hrs 42 mins ago0x96fa1eb18e9c0216ad8685dc03259b1df20fd9d0 IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00314219 23.04338979
0x94f863dce6cb512f9a097be5cb7619617f01a31c5c14e00afd05ee6a3450d195Add_liquidity152964552022-08-07 17:04:214 hrs 48 mins ago0xfe86e169775846cf2b630af737fc57a861a13e64 IN  Lido: Curve Liquidity Farming Pool Contract1.22246404 Ether0.00537785 29.72387171
0x1712edf6e029d724de78738d0b8d26f301a9c877336287a87d10a1ccfbc8d192Add_liquidity152964252022-08-07 16:56:544 hrs 55 mins ago0x6aa1fe4b4f69d2b87646a165b6a89dc489010021 IN  Lido: Curve Liquidity Farming Pool Contract3.5 Ether0.00214818 11.87402209
0x7f90cebcc3b744c3170eecae50d6a1d72d162c81ba429228921b9c6ee09b2249Add_liquidity152964252022-08-07 16:56:544 hrs 55 mins ago0x2ca3a2b525e75b2f20f59deccae3ffa4bdf3eaa2 IN  Lido: Curve Liquidity Farming Pool Contract51.3 Ether0.00178889 11.87402209
0x826d95eabae48faebe37c31db068307165561e990b26105cb1d2132967ce628aAdd_liquidity152964142022-08-07 16:55:064 hrs 57 mins ago0x76fdff72c8d1dd69bfc7d6597f805b062608cba2 IN  Lido: Curve Liquidity Farming Pool Contract1.2 Ether0.00247801 16.45077507
0x071a8676e185601709fbab59b030fa1f8fda0179b3db35bd5dd2a62570a16183Add_liquidity152963902022-08-07 16:49:385 hrs 2 mins ago0xb08856994dd338b0db1253dcab0e5f56e27f3985 IN  Lido: Curve Liquidity Farming Pool Contract48.3 Ether0.00234656 15.57567515
0x342fa714f3a290a92dc367e523ddc510f3bc169a18a0ba56ac08877ea25c77e2Remove_liquidity...152962942022-08-07 16:29:515 hrs 22 mins ago0x2b4c7caee6a012d90159bbb7f09ca8e1fd5fb066 IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00340359 25.10745849
0x2c43ede5b4f55619c65b4d9ed3efc19b7a0bc108147fe9efed9ce1a54ffa4d1eAdd_liquidity152962502022-08-07 16:20:515 hrs 31 mins ago0x2b4c7caee6a012d90159bbb7f09ca8e1fd5fb066 IN  Lido: Curve Liquidity Farming Pool Contract27 Ether0.00365789 24.2797796
0xbfa5ab77c2b25baaee09c2178042e5d37ef06680098529983518037a02c93e8cAdd_liquidity152961442022-08-07 15:58:575 hrs 53 mins agoENS Name surfacemachine.eth IN  Lido: Curve Liquidity Farming Pool Contract11 Ether0.00176001 9.7271197
0x51befe664ada87f1d8498a51adaf1110be2276729a64a31ce6622c6f2babc2d2Remove_liquidity...152958942022-08-07 15:10:476 hrs 41 mins agoENS Name dadada.eth IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00276649 21.14913737
0x860039e157fbfaa073bcaea205c3ab7458fcbf879f74a37c9015fd12d38cd679Remove_liquidity...152957462022-08-07 14:41:277 hrs 11 mins ago0x716dcfbacd8008787b1dbea38a967f604a152095 IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.0008903 6.80615479
0x0b6d000082d3300856a760403dc5e5d26031a07a5fdc7f6e3144f0cd1c52ecb2Exchange152956082022-08-07 14:13:507 hrs 38 mins ago0xbc64bde4c3b70147c47c16dd9277a6aaef7e0f02 IN  Lido: Curve Liquidity Farming Pool Contract2,000 Ether0.00138219 11.38708381
0xa6ccbc80123859ff46d2eb2f99a471ad4f4562fa35d155348a0b223f2cb5780bAdd_liquidity152953222022-08-07 13:04:378 hrs 47 mins ago0x00edad537af5fd77f4477e82857536c604ac0f62 IN  Lido: Curve Liquidity Farming Pool Contract0.00317032 Ether0.00119993 6.63302175
0xff3651fff4b0cf8fd94bfc05018ba6ab639e5b4b761185c34fd8056abec1de6fRemove_liquidity152952142022-08-07 12:37:339 hrs 15 mins agoENS Name ethpie.eth IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00061363 5.19977832
0x249b649ae35bee0d3d302d9df70e8d219253024e0971017b387c860d23e39908Exchange152950962022-08-07 12:15:599 hrs 36 mins agoENS Name manzopower.eth IN  Lido: Curve Liquidity Farming Pool Contract11.2 Ether0.00158429 11.44335494
0xc79e0c6ec92fc0f17a9d624d2c2c4b7bd51176ef20b9e40ad2eb9bdb37b60f94Remove_liquidity...152950862022-08-07 12:13:339 hrs 39 mins ago0x584baa4b71b0a3fa522658128f36a6a4abeac2ae IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.00233237 16.0912312
0xc067fea498e65055accaa2f75bd66c66515c01b2e4cf2d552ca04d832559bb45Remove_liquidity...152950422022-08-07 12:02:249 hrs 50 mins agoENS Name mandalacapital.eth IN  Lido: Curve Liquidity Farming Pool Contract0 Ether0.0007576 5.79167739
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xf1cb50724df06412979aa7a75a634e87e44941d5408eb75a15de2c2932508049152975462022-08-07 21:11:3141 mins ago Paraswap v5: Augustus Swapper Mainnet Lido: Curve Liquidity Farming Pool Contract2.3 Ether
0x9f7345cd9b0e47f2eff52c8cd39024841ab08f26c2727167fb88a2e570d55726152974942022-08-07 20:59:0553 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract2.921975 Ether
0x5d1234dc227ee45628b19cf95847fa7681c43ce6f1f8b61002a75a2ae3b22a30152974922022-08-07 20:58:4853 mins ago 1inch: Aggregation Executor 1 Lido: Curve Liquidity Farming Pool Contract13.54308929 Ether
0x338ae42d95700ed0bf0973e4ed85e32e2467f3ccc9628ea74533ce69e8315139152973242022-08-07 20:22:031 hr 30 mins ago Lido: Curve Liquidity Farming Pool Contract 0xfa9a30350048b2bf66865ee20363067c66f67e580.09237245 Ether
0xf19873f2a7e05506b16456232f6c013a92c78519e2f31ac085c4fca69d148d46152973002022-08-07 20:15:361 hr 36 mins ago Lido: Curve Liquidity Farming Pool ContractParaswap v5: Augustus Swapper Mainnet0.96315249 Ether
0xc0edcaf5383f854876f5ddfc9caf8659ba587511ed798b901cda35a19644aab3152972622022-08-07 20:07:541 hr 44 mins ago Paraswap v5: Augustus Swapper Mainnet Lido: Curve Liquidity Farming Pool Contract3.37849444 Ether
0x7c97e6c8b2697992a4012bcc306b0c869a9f4fb9810399a0a04a5d39629ddb91152972602022-08-07 20:07:411 hr 44 mins ago Lido: Curve Liquidity Farming Pool Contract 1inch: Aggregation Executor 160.54981261 Ether
0xe3ea0347dd04a60c9c3df55213809ca36e14c4c71b37b88f75a27542e5cf3c9b152972362022-08-07 20:02:341 hr 50 mins ago Lido: Curve Liquidity Farming Pool Contract 0x27239549dd40e1d60f5b80b0c4196923745b1fd20.98852957 Ether
0x89d280cb8320ba5d6d76ec69ba74bbe8d0512c98356064a199b2a78f9f901201152972342022-08-07 20:01:591 hr 50 mins ago 1inch: Aggregation Executor 1 Lido: Curve Liquidity Farming Pool Contract31.65880645 Ether
0xf0d814b22a29fef39abfdf7488670f3759ee4cd4b1c58ac1dd6390b6c095c040152972272022-08-07 20:00:431 hr 51 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract0.35658 Ether
0xfaf678af25384191f257a009437ab936b3e4bb0b5064e2c2d90dec9ffe8cf386152972052022-08-07 19:55:251 hr 57 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract0.9905 Ether
0xe1ebbfbc27bc227d46e40a6e50467d21d992e92cdd18c53516ae5dad40fbd0fd152971242022-08-07 19:35:002 hrs 17 mins ago Lido: Curve Liquidity Farming Pool Contract0x131c71e79b62c38df5123bd89559577e3abbdce71.99879392 Ether
0x7f647df9e8ecc34548b3cb1e3cc84b8f861c0b5886aaff5480b83d6dd94984d0152970942022-08-07 19:27:472 hrs 24 mins ago Lido: Curve Liquidity Farming Pool Contract DSProxy #213,8613.95509029 Ether
0xbd50c4f57a6649d4b23b72864d62a6315ecc4b9661ff8ab0a776324ff9933bbc152970502022-08-07 19:17:312 hrs 35 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract13.80477192 Ether
0x52e0181a6064ff84cd9f42ca16cf265af568ee5286a077102dad5b11343a15e3152970002022-08-07 19:07:472 hrs 44 mins ago 0x0031130c56162e00a7e9c01ee4147b11cbac8776 Lido: Curve Liquidity Farming Pool Contract1.456426 Ether
0x464d331e7265a4fd9c6b5b21b01df067cd4e8949b45a351f3dd3942a2317a563152969052022-08-07 18:46:053 hrs 6 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract0.9905 Ether
0xbb6826d7ce4c90c9309ca7d4a221f26053f0e524e0e5596ef532921f7406f571152968972022-08-07 18:44:343 hrs 8 mins ago Lido: Curve Liquidity Farming Pool Contract 1inch: Aggregation Executor 1118.19257222 Ether
0x9bbccf297fdf82160b5f46272a04e6a801acdd3218ba12d16bf26f8a6931db5d152967402022-08-07 18:11:473 hrs 40 mins ago 1inch: Aggregation Executor 1 Lido: Curve Liquidity Farming Pool Contract220 Ether
0x98d184967be797c342e138b2efda13f71988699cd187178d1168af9362d7bbf1152967272022-08-07 18:09:143 hrs 43 mins ago Lido: Curve Liquidity Farming Pool ContractParaswap v5: Augustus Swapper Mainnet2.40771278 Ether
0xc059fd710cc72562ebf27f5f10f206c084959babd5a5d3e1f8afb98b231d14f9152967022022-08-07 18:02:593 hrs 49 mins ago 1inch: Aggregation Executor 1 Lido: Curve Liquidity Farming Pool Contract240 Ether
0x843b9eba7e147e382229cef42f473630a2c49a47e112b5fc396775934bde3802152966782022-08-07 17:56:423 hrs 55 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract2.90219414 Ether
0x7f1f9da35fe6229847735662350d2bbb45e79b9cdd1d591b5b8a4c6903363a8d152966362022-08-07 17:46:514 hrs 5 mins ago 0x27239549dd40e1d60f5b80b0c4196923745b1fd2 Lido: Curve Liquidity Farming Pool Contract1.981 Ether
0xda4cd6fc26c4c3c6b9838b22338c0c898d8be37f84f338776d737549afbf07e1152966342022-08-07 17:46:374 hrs 5 mins ago 0x07f36cf3c834e423536680f560b6bad0319f5411 Lido: Curve Liquidity Farming Pool Contract0.49 Ether
0x84f1a6e810527be49d3cac61076cabc3ec8d7a15d9d45fdc9efe84a1f74fed4c152965542022-08-07 17:27:584 hrs 24 mins ago Lido: Curve Liquidity Farming Pool Contract0xff17a891c6ca64ba5847b138e46b9859fd9cd9de0.07385504 Ether
0x910f30495087ea9439d8a7444c86eff05a712f85b9907b6c390ba20dd27bb87b152964842022-08-07 17:10:354 hrs 42 mins ago Lido: Curve Liquidity Farming Pool Contract0x96fa1eb18e9c0216ad8685dc03259b1df20fd9d041.05334924 Ether
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x32fb6b5901fcb16d522a84713750e716ff3f4906

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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Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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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.