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Parent Txn Hash | Block | From | To | Value | |||
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0xdd432d932cdd32bc56383034da821139d99f7048e869aa776e047e3fea2403f6 | 2320909 | 541 days 13 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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