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Latest 25 from a total of 251 transactions
Transaction Hash MethodBlockFromToAdd_liquidity 20137380 2024-06-21 3:22:23 24 days ago 1718940143 IN 0 ETH$0.00 0.00061512 3.22216611 Remove_liquidity... 19692226 2024-04-19 21:41:47 87 days ago 1713562907 IN 0 ETH$0.00 0.00125864 8.36057226 Remove_liquidity... 19566312 2024-04-02 6:23:59 104 days ago 1712039039 IN 0 ETH$0.00 0.00288131 17.46154609 Remove_liquidity... 19563136 2024-04-01 19:43:59 105 days ago 1712000639 IN 0 ETH$0.00 0.00467308 30.82000598 Remove_liquidity... 19453612 2024-03-17 9:15:11 120 days ago 1710666911 IN 0 ETH$0.00 0.00459254 29.55895684 Remove_liquidity... 19396708 2024-03-09 9:41:11 128 days ago 1709977271 IN 0 ETH$0.00 0.00576164 39.45387178 Approve 19198647 2024-02-10 15:40:47 156 days ago 1707579647 IN 0 ETH$0.00 0.00185112 37.85222134 Add_liquidity 19198617 2024-02-10 15:34:47 156 days ago 1707579287 IN 0 ETH$0.00 0.00659584 35.52051892 Approve 19070371 2024-01-23 15:50:11 174 days ago 1706025011 IN 0 ETH$0.00 0.00072635 27.28619739 Approve 19070369 2024-01-23 15:49:47 174 days ago 1706024987 IN 0 ETH$0.00 0.00076222 28.63366552 Approve 19070272 2024-01-23 15:30:23 174 days ago 1706023823 IN 0 ETH$0.00 0.00123799 25.3147741 Remove_liquidity 19027122 2024-01-17 14:11:47 180 days ago 1705500707 IN 0 ETH$0.00 0.0049333 34.9812841 Remove_liquidity 19000248 2024-01-13 20:07:11 184 days ago 1705176431 IN 0 ETH$0.00 0.00271533 19.2572794 Remove_liquidity 18973684 2024-01-10 2:51:11 187 days ago 1704855071 IN 0 ETH$0.00 0.00477367 30.1583281 Approve 18938116 2024-01-05 2:29:23 192 days ago 1704421763 IN 0 ETH$0.00 0.00091442 18.69844631 Transfer 18938105 2024-01-05 2:27:11 192 days ago 1704421631 IN 0 ETH$0.00 0.00077236 15.76294921 Approve 18938020 2024-01-05 2:10:11 192 days ago 1704420611 IN 0 ETH$0.00 0.00130498 26.6845377 Add_liquidity 18937998 2024-01-05 2:05:47 192 days ago 1704420347 IN 0 ETH$0.00 0.00513846 31.70795299 Remove_liquidity... 18906720 2023-12-31 16:43:23 197 days ago 1704041003 IN 0 ETH$0.00 0.00279838 18.56811484 Approve 18904446 2023-12-31 9:03:47 197 days ago 1704013427 IN 0 ETH$0.00 0.00060392 12.35220675 Add_liquidity 18904443 2023-12-31 9:03:11 197 days ago 1704013391 IN 0 ETH$0.00 0.0023458 12.63120446 Approve 18895502 2023-12-30 2:53:11 198 days ago 1703904791 IN 0 ETH$0.00 0.00073231 15.06689586 Add_liquidity 18895484 2023-12-30 2:49:35 198 days ago 1703904575 IN 0 ETH$0.00 0.00333982 17.68450254 Remove_liquidity... 18815614 2023-12-18 21:41:35 210 days ago 1702935695 IN 0 ETH$0.00 0.01038121 70.68833541 Remove_liquidity 18705958 2023-12-03 12:47:23 225 days ago 1701607643 IN 0 ETH$0.00 0.00416249 29.46710757 Latest 1 internal transaction
Advanced mode:Parent Transaction Hash Block From To 16683219 2023-02-22 9:52:47 509 days ago 1677059567 Contract Creation 0 ETH$0.00 Loading...LoadingMinimal Proxy Contract for 0x24d937143d3f5cf04c72ba112735151a8cae2262
Contract Name:Vyper_contract
Compiler Versionvyper:0.2.15
Contract Source Code (Vyper language format)
# @version 0.2.15 """ @title StableSwap @author Curve.Fi @license Copyright (c) Curve.Fi, 2020-2021 - all rights reserved @notice 2 coin pool implementation with no lending @dev ERC20 support for return True/revert, return True/False, return None Support for positive-rebasing and fee-on-transfer tokens """ from vyper.interfaces import ERC20 interface Factory: def convert_fees() -> bool: nonpayable def get_fee_receiver(_pool: address) -> address: view def admin() -> address: view event Transfer: sender: indexed(address) receiver: indexed(address) value: uint256 event Approval: owner: indexed(address) spender: indexed(address) value: uint256 event TokenExchange: buyer: indexed(address) sold_id: int128 tokens_sold: uint256 bought_id: int128 tokens_bought: uint256 event AddLiquidity: provider: indexed(address) token_amounts: uint256[N_COINS] fees: uint256[N_COINS] invariant: uint256 token_supply: uint256 event RemoveLiquidity: provider: indexed(address) token_amounts: uint256[N_COINS] fees: uint256[N_COINS] token_supply: uint256 event RemoveLiquidityOne: provider: indexed(address) token_amount: uint256 coin_amount: uint256 token_supply: uint256 event RemoveLiquidityImbalance: provider: indexed(address) token_amounts: uint256[N_COINS] fees: uint256[N_COINS] invariant: uint256 token_supply: uint256 event RampA: old_A: uint256 new_A: uint256 initial_time: uint256 future_time: uint256 event StopRampA: A: uint256 t: uint256 N_COINS: constant(int128) = 2 PRECISION: constant(uint256) = 10 ** 18 FEE_DENOMINATOR: constant(uint256) = 10 ** 10 ADMIN_FEE: constant(uint256) = 5000000000 A_PRECISION: constant(uint256) = 100 MAX_A: constant(uint256) = 10 ** 6 MAX_A_CHANGE: constant(uint256) = 10 MIN_RAMP_TIME: constant(uint256) = 86400 factory: address coins: public(address[N_COINS]) admin_balances: public(uint256[N_COINS]) fee: public(uint256) # fee * 1e10 initial_A: public(uint256) future_A: public(uint256) initial_A_time: public(uint256) future_A_time: public(uint256) rate_multipliers: uint256[N_COINS] name: public(String[64]) symbol: public(String[32]) balanceOf: public(HashMap[address, uint256]) allowance: public(HashMap[address, HashMap[address, uint256]]) totalSupply: public(uint256) @external def __init__(): # we do this to prevent the implementation contract from being used as a pool self.fee = 31337 @external def initialize( _name: String[32], _symbol: String[10], _coins: address[4], _rate_multipliers: uint256[4], _A: uint256, _fee: uint256, ): """ @notice Contract constructor @param _name Name of the new pool @param _symbol Token symbol @param _coins List of all ERC20 conract addresses of coins @param _rate_multipliers List of number of decimals in coins @param _A Amplification coefficient multiplied by n ** (n - 1) @param _fee Fee to charge for exchanges """ # check if fee was already set to prevent initializing contract twice assert self.fee == 0 for i in range(N_COINS): coin: address = _coins[i] if coin == ZERO_ADDRESS: break self.coins[i] = coin self.rate_multipliers[i] = _rate_multipliers[i] A: uint256 = _A * A_PRECISION self.initial_A = A self.future_A = A self.fee = _fee self.factory = msg.sender self.name = concat("Curve.fi Factory Plain Pool: ", _name) self.symbol = concat(_symbol, "-f") # fire a transfer event so block explorers identify the contract as an ERC20 log Transfer(ZERO_ADDRESS, self, 0) ### ERC20 Functionality ### @view @external def decimals() -> uint256: """ @notice Get the number of decimals for this token @dev Implemented as a view method to reduce gas costs @return uint256 decimal places """ return 18 @internal def _transfer(_from: address, _to: address, _value: uint256): # # NOTE: vyper does not allow underflows # # so the following subtraction would revert on insufficient balance self.balanceOf[_from] -= _value self.balanceOf[_to] += _value log Transfer(_from, _to, _value) @external def transfer(_to : address, _value : uint256) -> bool: """ @dev Transfer token for a specified address @param _to The address to transfer to. @param _value The amount to be transferred. """ self._transfer(msg.sender, _to, _value) return True @external def transferFrom(_from : address, _to : address, _value : uint256) -> bool: """ @dev Transfer tokens from one address to another. @param _from address The address which you want to send tokens from @param _to address The address which you want to transfer to @param _value uint256 the amount of tokens to be transferred """ self._transfer(_from, _to, _value) _allowance: uint256 = self.allowance[_from][msg.sender] if _allowance != MAX_UINT256: self.allowance[_from][msg.sender] = _allowance - _value return True @external def approve(_spender : address, _value : uint256) -> bool: """ @notice Approve the passed address to transfer the specified amount of tokens on behalf of msg.sender @dev Beware that changing an allowance via this method brings the risk that someone may use both the old and new allowance by unfortunate transaction ordering: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 @param _spender The address which will transfer the funds @param _value The amount of tokens that may be transferred @return bool success """ self.allowance[msg.sender][_spender] = _value log Approval(msg.sender, _spender, _value) return True ### StableSwap Functionality ### @view @internal def _balances() -> uint256[N_COINS]: result: uint256[N_COINS] = empty(uint256[N_COINS]) for i in range(N_COINS): result[i] = ERC20(self.coins[i]).balanceOf(self) - self.admin_balances[i] return result @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] @view @external def get_balances() -> uint256[N_COINS]: return self._balances() @view @internal def _A() -> uint256: """ Handle ramping A up or down """ t1: uint256 = self.future_A_time A1: uint256 = self.future_A if block.timestamp < t1: A0: uint256 = self.initial_A t0: uint256 = self.initial_A_time # Expressions in uint256 cannot have negative numbers, thus "if" if A1 > A0: return A0 + (A1 - A0) * (block.timestamp - t0) / (t1 - t0) else: return A0 - (A0 - A1) * (block.timestamp - t0) / (t1 - t0) else: # when t1 == 0 or block.timestamp >= t1 return A1 @view @external def admin_fee() -> uint256: return ADMIN_FEE @view @external def A() -> uint256: return self._A() / A_PRECISION @view @external def A_precise() -> uint256: return self._A() @pure @internal def _xp_mem(_rates: uint256[N_COINS], _balances: uint256[N_COINS]) -> uint256[N_COINS]: result: uint256[N_COINS] = empty(uint256[N_COINS]) for i in range(N_COINS): result[i] = _rates[i] * _balances[i] / PRECISION return result @pure @internal def get_D(_xp: uint256[N_COINS], _amp: uint256) -> uint256: """ D invariant calculation in non-overflowing integer operations iteratively A * sum(x_i) * n**n + D = A * D * n**n + D**(n+1) / (n**n * prod(x_i)) Converging solution: D[j+1] = (A * n**n * sum(x_i) - D[j]**(n+1) / (n**n prod(x_i))) / (A * n**n - 1) """ S: uint256 = 0 for x in _xp: S += x if S == 0: return 0 D: uint256 = S Ann: uint256 = _amp * N_COINS for i in range(255): D_P: uint256 = D * D / _xp[0] * D / _xp[1] / (N_COINS)**2 Dprev: uint256 = D D = (Ann * S / A_PRECISION + D_P * N_COINS) * D / ((Ann - A_PRECISION) * D / A_PRECISION + (N_COINS + 1) * D_P) # Equality with the precision of 1 if D > Dprev: if D - Dprev <= 1: return D else: if Dprev - D <= 1: return D # convergence typically occurs in 4 rounds or less, this should be unreachable! # if it does happen the pool is borked and LPs can withdraw via `remove_liquidity` raise @view @internal def get_D_mem(_rates: uint256[N_COINS], _balances: uint256[N_COINS], _amp: uint256) -> uint256: xp: uint256[N_COINS] = self._xp_mem(_rates, _balances) return self.get_D(xp, _amp) @view @external def get_virtual_price() -> uint256: """ @notice The current virtual price of the pool LP token @dev Useful for calculating profits @return LP token virtual price normalized to 1e18 """ amp: uint256 = self._A() balances: uint256[N_COINS] = self._balances() xp: uint256[N_COINS] = self._xp_mem(self.rate_multipliers, balances) D: uint256 = self.get_D(xp, amp) # D is in the units similar to DAI (e.g. converted to precision 1e18) # When balanced, D = n * x_u - total virtual value of the portfolio return D * PRECISION / self.totalSupply @view @external def calc_token_amount(_amounts: uint256[N_COINS], _is_deposit: bool) -> uint256: """ @notice Calculate addition or reduction in token supply from a deposit or withdrawal @dev This calculation accounts for slippage, but not fees. Needed to prevent front-running, not for precise calculations! @param _amounts Amount of each coin being deposited @param _is_deposit set True for deposits, False for withdrawals @return Expected amount of LP tokens received """ amp: uint256 = self._A() balances: uint256[N_COINS] = self._balances() D0: uint256 = self.get_D_mem(self.rate_multipliers, balances, amp) for i in range(N_COINS): amount: uint256 = _amounts[i] if _is_deposit: balances[i] += amount else: balances[i] -= amount D1: uint256 = self.get_D_mem(self.rate_multipliers, balances, amp) diff: uint256 = 0 if _is_deposit: diff = D1 - D0 else: diff = D0 - D1 return diff * self.totalSupply / D0 @external @nonreentrant('lock') def add_liquidity( _amounts: uint256[N_COINS], _min_mint_amount: uint256, _receiver: address = msg.sender ) -> uint256: """ @notice Deposit coins into the pool @param _amounts List of amounts of coins to deposit @param _min_mint_amount Minimum amount of LP tokens to mint from the deposit @param _receiver Address that owns the minted LP tokens @return Amount of LP tokens received by depositing """ amp: uint256 = self._A() old_balances: uint256[N_COINS] = self._balances() rates: uint256[N_COINS] = self.rate_multipliers # Initial invariant D0: uint256 = self.get_D_mem(rates, old_balances, amp) total_supply: uint256 = self.totalSupply new_balances: uint256[N_COINS] = old_balances for i in range(N_COINS): amount: uint256 = _amounts[i] if amount > 0: coin: address = self.coins[i] initial: uint256 = ERC20(coin).balanceOf(self) response: Bytes[32] = raw_call( coin, concat( method_id("transferFrom(address,address,uint256)"), convert(msg.sender, bytes32), convert(self, bytes32), convert(amount, bytes32), ), max_outsize=32, ) if len(response) > 0: assert convert(response, bool) # dev: failed transfer new_balances[i] += ERC20(coin).balanceOf(self) - initial else: assert total_supply != 0 # dev: initial deposit requires all coins # Invariant after change D1: uint256 = self.get_D_mem(rates, new_balances, amp) assert D1 > D0 # We need to recalculate the invariant accounting for fees # to calculate fair user's share fees: uint256[N_COINS] = empty(uint256[N_COINS]) mint_amount: uint256 = 0 if total_supply > 0: # Only account for fees if we are not the first to deposit base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1)) for i in range(N_COINS): ideal_balance: uint256 = D1 * old_balances[i] / D0 difference: uint256 = 0 new_balance: uint256 = new_balances[i] if ideal_balance > new_balance: difference = ideal_balance - new_balance else: difference = new_balance - ideal_balance fees[i] = base_fee * difference / FEE_DENOMINATOR self.admin_balances[i] += fees[i] * ADMIN_FEE / FEE_DENOMINATOR new_balances[i] -= fees[i] D2: uint256 = self.get_D_mem(rates, new_balances, amp) mint_amount = total_supply * (D2 - D0) / D0 else: mint_amount = D1 # Take the dust if there was any assert mint_amount >= _min_mint_amount, "Slippage screwed you" # Mint pool tokens total_supply += mint_amount self.balanceOf[_receiver] += mint_amount self.totalSupply = total_supply log Transfer(ZERO_ADDRESS, _receiver, mint_amount) log AddLiquidity(msg.sender, _amounts, fees, D1, total_supply) return mint_amount @view @internal def get_y(i: int128, j: int128, x: uint256, xp: uint256[N_COINS]) -> uint256: """ Calculate x[j] if one makes x[i] = x Done by solving quadratic equation iteratively. x_1**2 + x_1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A) x_1**2 + b*x_1 = c x_1 = (x_1**2 + c) / (2*x_1 + b) """ # x in the input is converted to the same price/precision assert i != j # dev: same coin assert j >= 0 # dev: j below zero assert j < N_COINS # dev: j above N_COINS # should be unreachable, but good for safety assert i >= 0 assert i < N_COINS amp: uint256 = self._A() D: uint256 = self.get_D(xp, amp) S_: uint256 = 0 _x: uint256 = 0 y_prev: uint256 = 0 c: uint256 = D Ann: uint256 = amp * N_COINS for _i in range(N_COINS): if _i == i: _x = x elif _i != j: _x = xp[_i] else: continue S_ += _x c = c * D / (_x * N_COINS) c = c * D * A_PRECISION / (Ann * N_COINS) b: uint256 = S_ + D * A_PRECISION / Ann # - D y: uint256 = D for _i in range(255): y_prev = y y = (y*y + c) / (2 * y + b - D) # Equality with the precision of 1 if y > y_prev: if y - y_prev <= 1: return y else: if y_prev - y <= 1: return y raise @view @external def get_dy(i: int128, j: int128, dx: uint256) -> uint256: """ @notice Calculate the current output dy given input dx @dev Index values can be found via the `coins` public getter method @param i Index value for the coin to send @param j Index valie of the coin to recieve @param dx Amount of `i` being exchanged @return Amount of `j` predicted """ rates: uint256[N_COINS] = self.rate_multipliers xp: uint256[N_COINS] = self._xp_mem(rates, self._balances()) x: uint256 = xp[i] + (dx * rates[i] / PRECISION) y: uint256 = self.get_y(i, j, x, xp) dy: uint256 = xp[j] - y - 1 fee: uint256 = self.fee * dy / FEE_DENOMINATOR return (dy - fee) * PRECISION / rates[j] @external @nonreentrant('lock') def exchange( i: int128, j: int128, _dx: uint256, _min_dy: uint256, _receiver: address = msg.sender, ) -> uint256: """ @notice Perform an exchange between two coins @dev Index values can be found via the `coins` public getter method @param i Index value for the coin to send @param j Index valie of the coin to recieve @param _dx Amount of `i` being exchanged @param _min_dy Minimum amount of `j` to receive @return Actual amount of `j` received """ rates: uint256[N_COINS] = self.rate_multipliers old_balances: uint256[N_COINS] = self._balances() xp: uint256[N_COINS] = self._xp_mem(rates, old_balances) coin: address = self.coins[i] dx: uint256 = ERC20(coin).balanceOf(self) response: Bytes[32] = raw_call( coin, concat( method_id("transferFrom(address,address,uint256)"), convert(msg.sender, bytes32), convert(self, bytes32), convert(_dx, bytes32), ), max_outsize=32, ) if len(response) > 0: assert convert(response, bool) dx = ERC20(coin).balanceOf(self) - dx 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" self.admin_balances[j] += (dy_fee * ADMIN_FEE / FEE_DENOMINATOR) * PRECISION / rates[j] response = raw_call( self.coins[j], concat( method_id("transfer(address,uint256)"), convert(_receiver, 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( _burn_amount: uint256, _min_amounts: uint256[N_COINS], _receiver: address = msg.sender ) -> uint256[N_COINS]: """ @notice Withdraw coins from the pool @dev Withdrawal amounts are based on current deposit ratios @param _burn_amount Quantity of LP tokens to burn in the withdrawal @param _min_amounts Minimum amounts of underlying coins to receive @param _receiver Address that receives the withdrawn coins @return List of amounts of coins that were withdrawn """ total_supply: uint256 = self.totalSupply amounts: uint256[N_COINS] = empty(uint256[N_COINS]) balances: uint256[N_COINS] = self._balances() for i in range(N_COINS): value: uint256 = balances[i] * _burn_amount / total_supply assert value >= _min_amounts[i], "Withdrawal resulted in fewer coins than expected" amounts[i] = value response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(_receiver, bytes32), convert(value, bytes32), ), max_outsize=32, ) if len(response) > 0: assert convert(response, bool) total_supply -= _burn_amount self.balanceOf[msg.sender] -= _burn_amount self.totalSupply = total_supply log Transfer(msg.sender, ZERO_ADDRESS, _burn_amount) log RemoveLiquidity(msg.sender, amounts, empty(uint256[N_COINS]), total_supply) return amounts @external @nonreentrant('lock') def remove_liquidity_imbalance( _amounts: uint256[N_COINS], _max_burn_amount: uint256, _receiver: address = msg.sender ) -> uint256: """ @notice Withdraw coins from the pool in an imbalanced amount @param _amounts List of amounts of underlying coins to withdraw @param _max_burn_amount Maximum amount of LP token to burn in the withdrawal @param _receiver Address that receives the withdrawn coins @return Actual amount of the LP token burned in the withdrawal """ amp: uint256 = self._A() old_balances: uint256[N_COINS] = self._balances() rates: uint256[N_COINS] = self.rate_multipliers D0: uint256 = self.get_D_mem(rates, old_balances, amp) new_balances: uint256[N_COINS] = old_balances for i in range(N_COINS): amount: uint256 = _amounts[i] if amount != 0: new_balances[i] -= amount response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(_receiver, bytes32), convert(amount, bytes32), ), max_outsize=32, ) if len(response) > 0: assert convert(response, bool) D1: uint256 = self.get_D_mem(rates, new_balances, amp) fees: uint256[N_COINS] = empty(uint256[N_COINS]) base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1)) for i in range(N_COINS): ideal_balance: uint256 = D1 * old_balances[i] / D0 difference: uint256 = 0 new_balance: uint256 = new_balances[i] if ideal_balance > new_balance: difference = ideal_balance - new_balance else: difference = new_balance - ideal_balance fees[i] = base_fee * difference / FEE_DENOMINATOR self.admin_balances[i] += fees[i] * ADMIN_FEE / FEE_DENOMINATOR new_balances[i] -= fees[i] D2: uint256 = self.get_D_mem(rates, new_balances, amp) total_supply: uint256 = self.totalSupply burn_amount: uint256 = ((D0 - D2) * total_supply / D0) + 1 assert burn_amount > 1 # dev: zero tokens burned assert burn_amount <= _max_burn_amount, "Slippage screwed you" total_supply -= burn_amount self.totalSupply = total_supply self.balanceOf[msg.sender] -= burn_amount log Transfer(msg.sender, ZERO_ADDRESS, burn_amount) log RemoveLiquidityImbalance(msg.sender, _amounts, fees, D1, total_supply) return burn_amount @pure @internal def get_y_D(A: uint256, i: int128, xp: uint256[N_COINS], D: uint256) -> uint256: """ Calculate x[i] if one reduces D from being calculated for xp to D Done by solving quadratic equation iteratively. x_1**2 + x_1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A) x_1**2 + b*x_1 = c x_1 = (x_1**2 + c) / (2*x_1 + b) """ # x in the input is converted to the same price/precision assert i >= 0 # dev: i below zero assert i < N_COINS # dev: i above N_COINS S_: uint256 = 0 _x: uint256 = 0 y_prev: uint256 = 0 c: uint256 = D Ann: uint256 = A * N_COINS for _i in range(N_COINS): if _i != i: _x = xp[_i] else: continue S_ += _x c = c * D / (_x * N_COINS) c = c * D * A_PRECISION / (Ann * N_COINS) b: uint256 = S_ + D * A_PRECISION / Ann y: uint256 = D for _i in range(255): y_prev = y y = (y*y + c) / (2 * y + b - D) # Equality with the precision of 1 if y > y_prev: if y - y_prev <= 1: return y else: if y_prev - y <= 1: return y raise @view @internal def _calc_withdraw_one_coin(_burn_amount: uint256, i: int128) -> uint256[2]: # First, need to calculate # * Get current D # * Solve Eqn against y_i for D - _token_amount amp: uint256 = self._A() rates: uint256[N_COINS] = self.rate_multipliers xp: uint256[N_COINS] = self._xp_mem(rates, self._balances()) D0: uint256 = self.get_D(xp, amp) total_supply: uint256 = self.totalSupply D1: uint256 = D0 - _burn_amount * D0 / total_supply new_y: uint256 = self.get_y_D(amp, i, xp, D1) base_fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1)) xp_reduced: uint256[N_COINS] = empty(uint256[N_COINS]) for j in range(N_COINS): dx_expected: uint256 = 0 xp_j: uint256 = xp[j] if j == i: dx_expected = xp_j * D1 / D0 - new_y else: dx_expected = xp_j - xp_j * D1 / D0 xp_reduced[j] = xp_j - base_fee * dx_expected / FEE_DENOMINATOR dy: uint256 = xp_reduced[i] - self.get_y_D(amp, i, xp_reduced, D1) dy_0: uint256 = (xp[i] - new_y) * PRECISION / rates[i] # w/o fees dy = (dy - 1) * PRECISION / rates[i] # Withdraw less to account for rounding errors return [dy, dy_0 - dy] @view @external def calc_withdraw_one_coin(_burn_amount: uint256, i: int128) -> uint256: """ @notice Calculate the amount received when withdrawing a single coin @param _burn_amount Amount of LP tokens to burn in the withdrawal @param i Index value of the coin to withdraw @return Amount of coin received """ return self._calc_withdraw_one_coin(_burn_amount, i)[0] @external @nonreentrant('lock') def remove_liquidity_one_coin( _burn_amount: uint256, i: int128, _min_received: uint256, _receiver: address = msg.sender, ) -> uint256: """ @notice Withdraw a single coin from the pool @param _burn_amount Amount of LP tokens to burn in the withdrawal @param i Index value of the coin to withdraw @param _min_received Minimum amount of coin to receive @param _receiver Address that receives the withdrawn coins @return Amount of coin received """ dy: uint256[2] = self._calc_withdraw_one_coin(_burn_amount, i) assert dy[0] >= _min_received, "Not enough coins removed" self.admin_balances[i] += dy[1] * ADMIN_FEE / FEE_DENOMINATOR total_supply: uint256 = self.totalSupply - _burn_amount self.totalSupply = total_supply self.balanceOf[msg.sender] -= _burn_amount log Transfer(msg.sender, ZERO_ADDRESS, _burn_amount) response: Bytes[32] = raw_call( self.coins[i], concat( method_id("transfer(address,uint256)"), convert(_receiver, bytes32), convert(dy[0], bytes32), ), max_outsize=32, ) if len(response) > 0: assert convert(response, bool) log RemoveLiquidityOne(msg.sender, _burn_amount, dy[0], total_supply) return dy[0] @external def ramp_A(_future_A: uint256, _future_time: uint256): assert msg.sender == Factory(self.factory).admin() # dev: only owner assert block.timestamp >= self.initial_A_time + MIN_RAMP_TIME assert _future_time >= block.timestamp + MIN_RAMP_TIME # dev: insufficient time _initial_A: uint256 = self._A() _future_A_p: uint256 = _future_A * A_PRECISION assert _future_A > 0 and _future_A < MAX_A if _future_A_p < _initial_A: assert _future_A_p * MAX_A_CHANGE >= _initial_A else: assert _future_A_p <= _initial_A * MAX_A_CHANGE self.initial_A = _initial_A self.future_A = _future_A_p self.initial_A_time = block.timestamp self.future_A_time = _future_time log RampA(_initial_A, _future_A_p, block.timestamp, _future_time) @external def stop_ramp_A(): assert msg.sender == Factory(self.factory).admin() # dev: only owner current_A: uint256 = self._A() self.initial_A = current_A self.future_A = current_A self.initial_A_time = block.timestamp self.future_A_time = block.timestamp # now (block.timestamp < t1) is always False, so we return saved A log StopRampA(current_A, block.timestamp) @external def withdraw_admin_fees(): receiver: address = Factory(self.factory).get_fee_receiver(self) for i in range(N_COINS): amount: uint256 = self.admin_balances[i] if amount != 0: coin: address = self.coins[i] raw_call( coin, concat( method_id("transfer(address,uint256)"), convert(receiver, bytes32), convert(amount, bytes32) ) ) self.admin_balances[i] = 0
Contract ABI
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