Contract
0x27e611fd27b276acbd5ffd632e5eaebec9761e40
4
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OVERVIEW
Curve is an exchange liquidity pool on Ethereum (like Uniswap) designed for (1) extremely efficient stablecoin trading (2) low risk, supplemental fee income for liquidity providers, without an opportunity cost.
Latest 1 internal transaction
Parent Txn Hash | Block | From | To | Value | |||
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0xdd432d932cdd32bc56383034da821139d99f7048e869aa776e047e3fea2403f6 | 2320909 | 716 days 17 hrs ago | Fantom: Deployer | Contract Creation | 0 FTM |
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Contract Source Code Verified (Exact Match)
Contract Name:
Vyper_contract
Compiler Version
vyper:0.2.7
Contract Source Code (Vyper language format)
# @version ^0.2.7 """ @title StableSwap @author Curve.Fi @license Copyright (c) Curve.Fi, 2020 - all rights reserved @notice Minimal pool implementation with no lending @dev 3pool implementation on Fantom """ interface ERC20: def transfer(_receiver: address, _amount: uint256): nonpayable def transferFrom(_sender: address, _receiver: address, _amount: uint256): nonpayable def approve(_spender: address, _amount: uint256): nonpayable def balanceOf(_owner: address) -> uint256: view interface CurveToken: def totalSupply() -> uint256: view def mint(_to: address, _value: uint256) -> bool: nonpayable def burnFrom(_to: address, _value: uint256) -> bool: nonpayable # Events 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 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 PRECISION_MUL: constant(uint256[N_COINS]) = [1, 1000000000000] RATES: constant(uint256[N_COINS]) = [1000000000000000000, 1000000000000000000000000000000] # 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 ADMIN_ACTIONS_DELAY: constant(uint256) = 3 * 86400 MIN_RAMP_TIME: constant(uint256) = 86400 coins: public(address[N_COINS]) balances: public(uint256[N_COINS]) fee: public(uint256) # fee * 1e10 admin_fee: public(uint256) # admin_fee * 1e10 owner: public(address) A_PRECISION: constant(uint256) = 100 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 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__( _name: String[32], _symbol: String[10], _owner: address, _coins: address[N_COINS], _A: uint256, _fee: uint256, _admin_fee: uint256 ): """ @notice Contract constructor @param _name Name of the new pool @param _symbol Token symbol @param _owner Contract owner address @param _coins Addresses of ERC20 conracts of coins @param _A Amplification coefficient multiplied by n * (n - 1) @param _fee Fee to charge for exchanges @param _admin_fee Admin fee """ for i in range(N_COINS): assert _coins[i] != 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.name = _name self.symbol = _symbol # 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 @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. """ # NOTE: vyper does not allow underflows # so the following subtraction would revert on insufficient balance self.balanceOf[msg.sender] -= _value self.balanceOf[_to] += _value log 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.balanceOf[_from] -= _value self.balanceOf[_to] += _value _allowance: uint256 = self.allowance[_from][msg.sender] if _allowance != MAX_UINT256: self.allowance[_from][msg.sender] = _allowance - _value log Transfer(_from, _to, _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 @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 A() -> uint256: return self._A() / A_PRECISION @view @external def A_precise() -> uint256: return self._A() @view @internal def _xp_sstore() -> uint256[N_COINS]: result: uint256[N_COINS] = RATES for i in range(N_COINS): result[i] = result[i] * self.balances[i] / PRECISION return result @pure @internal def _xp_mem(_balances: uint256[N_COINS]) -> uint256[N_COINS]: result: uint256[N_COINS] = RATES for i in range(N_COINS): result[i] = result[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 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) # If division by 0, this will be borked: only withdrawal will work. And that is good 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 @internal def _get_D_mem(_balances: uint256[N_COINS], _amp: uint256) -> uint256: return self._get_D(self._xp_mem(_balances), _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 """ D: uint256 = self._get_D(self._xp_sstore(), 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 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(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_mem(balances, amp) diff: uint256 = 0 if _is_deposit: diff = D1 - D0 else: diff = D0 - D1 return diff * self.totalSupply / D0 @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 amp: uint256 = self._A() old_balances: uint256[N_COINS] = self.balances # Initial invariant D0: uint256 = self._get_D_mem(old_balances, amp) token_supply: uint256 = self.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 # balances store amounts of c-tokens new_balances[i] += _amounts[i] # Invariant after change D1: uint256 = self._get_D_mem(new_balances, amp) assert D1 > D0 # We need to recalculate the invariant accounting for fees # to calculate fair user's share D2: uint256 = D1 fees: uint256[N_COINS] = empty(uint256[N_COINS]) mint_amount: 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 new_balance: uint256 = new_balances[i] if ideal_balance > new_balance: difference = ideal_balance - new_balance else: difference = new_balance - ideal_balance fees[i] = fee * difference / FEE_DENOMINATOR self.balances[i] = new_balance - (fees[i] * admin_fee / FEE_DENOMINATOR) new_balances[i] -= fees[i] D2 = self._get_D_mem(new_balances, amp) mint_amount = token_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 for i in range(N_COINS): if _amounts[i] > 0: # "safeTransferFrom" which works for ERC20s which return bool or not _response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transferFrom(address,address,uint256)"), convert(msg.sender, bytes32), convert(self, bytes32), convert(_amounts[i], bytes32), ), max_outsize=32, ) if len(_response) > 0: assert convert(_response, bool) # dev: failed transfer # end "safeTransferFrom" # Mint pool tokens token_supply += mint_amount self.balanceOf[msg.sender] += mint_amount self.totalSupply = token_supply log Transfer(ZERO_ADDRESS, 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 + 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 A: uint256 = self._A() D: uint256 = self._get_D(_xp, A) 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 = 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._xp_sstore() rates: uint256[N_COINS] = RATES 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] @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 old_balances: uint256[N_COINS] = self.balances xp: uint256[N_COINS] = self._xp_mem(old_balances) rates: uint256[N_COINS] = RATES 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 * self.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 _response: Bytes[32] = raw_call( self.coins[i], 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) _response = raw_call( self.coins[j], concat( method_id("transfer(address,uint256)"), convert(msg.sender, bytes32), convert(dy, bytes32), ), max_outsize=32, ) if len(_response) > 0: assert convert(_response, bool) 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 """ total_supply: uint256 = self.totalSupply amounts: uint256[N_COINS] = empty(uint256[N_COINS]) fees: uint256[N_COINS] = empty(uint256[N_COINS]) # Fees are unused but we've got them historically in event for i in range(N_COINS): old_balance: uint256 = self.balances[i] value: uint256 = old_balance * _amount / total_supply assert value >= _min_amounts[i], "Withdrawal resulted in fewer coins than expected" self.balances[i] = old_balance - value amounts[i] = value _response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(msg.sender, bytes32), convert(value, bytes32), ), max_outsize=32, ) if len(_response) > 0: assert convert(_response, bool) total_supply -= _amount self.balanceOf[msg.sender] -= _amount self.totalSupply = total_supply log Transfer(msg.sender, ZERO_ADDRESS, _amount) log RemoveLiquidity(msg.sender, amounts, fees, 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_mem(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(new_balances, amp) fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1)) admin_fee: uint256 = self.admin_fee fees: uint256[N_COINS] = empty(uint256[N_COINS]) for i in range(N_COINS): new_balance: uint256 = new_balances[i] ideal_balance: uint256 = D1 * old_balances[i] / D0 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 self.balances[i] = new_balance - (fees[i] * admin_fee / FEE_DENOMINATOR) new_balances[i] = new_balance - fees[i] D2: uint256 = self._get_D_mem(new_balances, amp) token_supply: uint256 = self.totalSupply token_amount: uint256 = (D0 - D2) * token_supply / D0 assert token_amount != 0 # dev: zero tokens burned token_amount += 1 # In case of rounding errors - make it unfavorable for the "attacker" assert token_amount <= _max_burn_amount, "Slippage screwed you" token_supply -= token_amount self.totalSupply = token_supply self.balanceOf[msg.sender] -= token_amount log Transfer(msg.sender, ZERO_ADDRESS, token_amount) for i in range(N_COINS): if _amounts[i] != 0: _response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(msg.sender, bytes32), convert(_amounts[i], bytes32), ), max_outsize=32, ) if len(_response) > 0: assert convert(_response, bool) 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 + 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 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, 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._xp_sstore() D0: uint256 = self._get_D(xp, amp) total_supply: uint256 = self.totalSupply D1: uint256 = D0 - _token_amount * D0 / total_supply new_y: uint256 = self._get_y_D(amp, i, xp, D1) xp_reduced: uint256[N_COINS] = xp fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1)) 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) precisions: uint256[N_COINS] = PRECISION_MUL dy = (dy - 1) / precisions[i] # Withdraw less to account for rounding errors dy_0: uint256 = (xp[i] - new_y) / precisions[i] # w/o fees return dy, dy_0 - dy, total_supply @view @external def calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> uint256: """ @notice Calculate the amount received when withdrawing a single coin @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 total_supply: uint256 = 0 dy, dy_fee, total_supply = self._calc_withdraw_one_coin(_token_amount, i) assert dy >= _min_amount, "Not enough coins removed" self.balances[i] -= (dy + dy_fee * self.admin_fee / FEE_DENOMINATOR) total_supply -= _token_amount self.totalSupply = total_supply self.balanceOf[msg.sender] -= _token_amount log Transfer(msg.sender, ZERO_ADDRESS, _token_amount) _response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(msg.sender, bytes32), convert(dy, bytes32), ), max_outsize=32, ) if len(_response) > 0: assert convert(_response, bool) log RemoveLiquidityOne(msg.sender, _token_amount, dy, total_supply - _token_amount) 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 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 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 @view @external def admin_balances(i: uint256) -> uint256: return ERC20(self.coins[i]).balanceOf(self) - self.balances[i] @external def withdraw_admin_fees(): assert msg.sender == self.owner # dev: only owner for i in range(N_COINS): coin: address = self.coins[i] value: uint256 = ERC20(coin).balanceOf(self) - self.balances[i] if value > 0: _response: Bytes[32] = raw_call( coin, concat( method_id("transfer(address,uint256)"), convert(msg.sender, bytes32), convert(value, bytes32), ), max_outsize=32, ) # dev: failed transfer if len(_response) > 0: assert convert(_response, bool) @external def donate_admin_fees(): assert msg.sender == self.owner # dev: only owner for i in range(N_COINS): self.balances[i] = ERC20(self.coins[i]).balanceOf(self) @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
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _name (string): Curve.fi DAI/USDC
Arg [1] : _symbol (string): DAI+USDC
Arg [2] : _owner (address): 0x2d407ddb06311396fe14d4b49da5f0471447d45c
Arg [3] : _coins (address[2]): 0x8d11ec38a3eb5e956b052f67da8bdc9bef8abf3e,0x04068da6c83afcfa0e13ba15a6696662335d5b75
Arg [4] : _A (uint256): 450
Arg [5] : _fee (uint256): 4000000
Arg [6] : _admin_fee (uint256): 5000000000
-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [2] : 0000000000000000000000002d407ddb06311396fe14d4b49da5f0471447d45c
Arg [3] : 0000000000000000000000008d11ec38a3eb5e956b052f67da8bdc9bef8abf3e
Arg [4] : 00000000000000000000000004068da6c83afcfa0e13ba15a6696662335d5b75
Arg [5] : 00000000000000000000000000000000000000000000000000000000000001c2
Arg [6] : 00000000000000000000000000000000000000000000000000000000003d0900
Arg [7] : 000000000000000000000000000000000000000000000000000000012a05f200
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000011
Arg [9] : 43757276652e6669204441492f55534443000000000000000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [11] : 4441492b55534443000000000000000000000000000000000000000000000000
Age | Block | Fee Address | BC Fee Address | Voting Power | Jailed | Incoming |
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Validator ID :
0 FTM
Amount Staked
0
Amount Delegated
0
Staking Total
0
Staking Start Epoch
0
Staking Start Time
0
Proof of Importance
0
Origination Score
0
Validation Score
0
Active
0
Online
0
Downtime
0 s
Address | Amount | claimed Rewards | Created On Epoch | Created On |
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