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Contract Source Code Verified (Exact Match)
Contract Name:
CurveCryptoViews3Optimized
Compiler Version
vyper:0.3.10
Contract Source Code (Vyper language format)
# pragma version 0.3.10 # pragma optimize gas # pragma evm-version paris """ @title CurveCryptoViews3Optimized @author Curve.Fi @license Copyright (c) Curve.Fi, 2020-2023 - all rights reserved @notice This contract contains view-only external methods which can be gas-inefficient when called from smart contracts. """ from vyper.interfaces import ERC20 interface Curve: def MATH() -> Math: view def A() -> uint256: view def gamma() -> uint256: view def price_scale(i: uint256) -> uint256: view def price_oracle(i: uint256) -> uint256: view def get_virtual_price() -> uint256: view def balances(i: uint256) -> uint256: view def D() -> uint256: view def fee_calc(xp: uint256[N_COINS]) -> uint256: view def calc_token_fee( amounts: uint256[N_COINS], xp: uint256[N_COINS] ) -> uint256: view def future_A_gamma_time() -> uint256: view def totalSupply() -> uint256: view def precisions() -> uint256[N_COINS]: view def packed_fee_params() -> uint256: view interface Math: def newton_D( ANN: uint256, gamma: uint256, x_unsorted: uint256[N_COINS], K0_prev: uint256 ) -> uint256: view def get_y( ANN: uint256, gamma: uint256, x: uint256[N_COINS], D: uint256, i: uint256, ) -> uint256[2]: view def cbrt(x: uint256) -> uint256: view def reduction_coefficient( x: uint256[N_COINS], fee_gamma: uint256 ) -> uint256: view N_COINS: constant(uint256) = 3 PRECISION: constant(uint256) = 10**18 @external @view def get_dy( i: uint256, j: uint256, dx: uint256, swap: address ) -> uint256: dy: uint256 = 0 xp: uint256[N_COINS] = empty(uint256[N_COINS]) # dy = (get_y(x + dx) - y) * (1 - fee) dy, xp = self._get_dy_nofee(i, j, dx, swap) dy -= Curve(swap).fee_calc(xp) * dy / 10**10 return dy @view @external def get_dx( i: uint256, j: uint256, dy: uint256, swap: address ) -> uint256: dx: uint256 = 0 xp: uint256[N_COINS] = empty(uint256[N_COINS]) fee_dy: uint256 = 0 _dy: uint256 = dy # for more precise dx (but never exact), increase num loops for k in range(5): dx, xp = self._get_dx_fee(i, j, _dy, swap) fee_dy = Curve(swap).fee_calc(xp) * _dy / 10**10 _dy = dy + fee_dy + 1 return dx @view @external def calc_withdraw_one_coin( token_amount: uint256, i: uint256, swap: address ) -> uint256: return self._calc_withdraw_one_coin(token_amount, i, swap)[0] @view @external def calc_token_amount( amounts: uint256[N_COINS], deposit: bool, swap: address ) -> uint256: d_token: uint256 = 0 amountsp: uint256[N_COINS] = empty(uint256[N_COINS]) xp: uint256[N_COINS] = empty(uint256[N_COINS]) d_token, amountsp, xp = self._calc_dtoken_nofee(amounts, deposit, swap) d_token -= ( Curve(swap).calc_token_fee(amountsp, xp) * d_token / 10**10 + 1 ) return d_token @external @view def calc_fee_get_dy(i: uint256, j: uint256, dx: uint256, swap: address ) -> uint256: dy: uint256 = 0 xp: uint256[N_COINS] = empty(uint256[N_COINS]) dy, xp = self._get_dy_nofee(i, j, dx, swap) return Curve(swap).fee_calc(xp) * dy / 10**10 @external @view def calc_fee_withdraw_one_coin( token_amount: uint256, i: uint256, swap: address ) -> uint256: return self._calc_withdraw_one_coin(token_amount, i, swap)[1] @view @external def calc_fee_token_amount( amounts: uint256[N_COINS], deposit: bool, swap: address ) -> uint256: d_token: uint256 = 0 amountsp: uint256[N_COINS] = empty(uint256[N_COINS]) xp: uint256[N_COINS] = empty(uint256[N_COINS]) d_token, amountsp, xp = self._calc_dtoken_nofee(amounts, deposit, swap) return Curve(swap).calc_token_fee(amountsp, xp) * d_token / 10**10 + 1 @internal @view def _calc_D_ramp( A: uint256, gamma: uint256, xp: uint256[N_COINS], precisions: uint256[N_COINS], price_scale: uint256[N_COINS - 1], swap: address ) -> uint256: math: Math = Curve(swap).MATH() D: uint256 = Curve(swap).D() if Curve(swap).future_A_gamma_time() > block.timestamp: _xp: uint256[N_COINS] = xp _xp[0] *= precisions[0] for k in range(N_COINS - 1): _xp[k + 1] = ( _xp[k + 1] * price_scale[k] * precisions[k + 1] / PRECISION ) D = math.newton_D(A, gamma, _xp, 0) return D @internal @view def _get_dx_fee( i: uint256, j: uint256, dy: uint256, swap: address ) -> (uint256, uint256[N_COINS]): # here, dy must include fees (and 1 wei offset) assert i != j and i < N_COINS and j < N_COINS, "coin index out of range" assert dy > 0, "do not exchange out 0 coins" math: Math = Curve(swap).MATH() xp: uint256[N_COINS] = empty(uint256[N_COINS]) precisions: uint256[N_COINS] = empty(uint256[N_COINS]) price_scale: uint256[N_COINS-1] = empty(uint256[N_COINS-1]) D: uint256 = 0 token_supply: uint256 = 0 A: uint256 = 0 gamma: uint256 = 0 xp, D, token_supply, price_scale, A, gamma, precisions = self._prep_calc(swap) # adjust xp with output dy. dy contains fee element, which we handle later # (hence this internal method is called _get_dx_fee) xp[j] -= dy xp[0] *= precisions[0] for k in range(N_COINS - 1): xp[k + 1] = xp[k + 1] * price_scale[k] * precisions[k + 1] / PRECISION x_out: uint256[2] = math.get_y(A, gamma, xp, D, i) dx: uint256 = x_out[0] - xp[i] xp[i] = x_out[0] if i > 0: dx = dx * PRECISION / price_scale[i - 1] dx /= precisions[i] return dx, xp @internal @view def _get_dy_nofee( i: uint256, j: uint256, dx: uint256, swap: address ) -> (uint256, uint256[N_COINS]): assert i != j and i < N_COINS and j < N_COINS, "coin index out of range" assert dx > 0, "do not exchange 0 coins" math: Math = Curve(swap).MATH() xp: uint256[N_COINS] = empty(uint256[N_COINS]) precisions: uint256[N_COINS] = empty(uint256[N_COINS]) price_scale: uint256[N_COINS-1] = empty(uint256[N_COINS-1]) D: uint256 = 0 token_supply: uint256 = 0 A: uint256 = 0 gamma: uint256 = 0 xp, D, token_supply, price_scale, A, gamma, precisions = self._prep_calc(swap) # adjust xp with input dx xp[i] += dx xp[0] *= precisions[0] for k in range(N_COINS - 1): xp[k + 1] = xp[k + 1] * price_scale[k] * precisions[k + 1] / PRECISION y_out: uint256[2] = math.get_y(A, gamma, xp, D, j) dy: uint256 = xp[j] - y_out[0] - 1 xp[j] = y_out[0] if j > 0: dy = dy * PRECISION / price_scale[j - 1] dy /= precisions[j] return dy, xp @internal @view def _calc_dtoken_nofee( amounts: uint256[N_COINS], deposit: bool, swap: address ) -> (uint256, uint256[N_COINS], uint256[N_COINS]): math: Math = Curve(swap).MATH() xp: uint256[N_COINS] = empty(uint256[N_COINS]) precisions: uint256[N_COINS] = empty(uint256[N_COINS]) price_scale: uint256[N_COINS-1] = empty(uint256[N_COINS-1]) D0: uint256 = 0 token_supply: uint256 = 0 A: uint256 = 0 gamma: uint256 = 0 xp, D0, token_supply, price_scale, A, gamma, precisions = self._prep_calc(swap) amountsp: uint256[N_COINS] = amounts if deposit: for k in range(N_COINS): xp[k] += amounts[k] else: for k in range(N_COINS): xp[k] -= amounts[k] xp[0] *= precisions[0] amountsp[0] *= precisions[0] for k in range(N_COINS - 1): p: uint256 = price_scale[k] * precisions[k + 1] xp[k + 1] = xp[k + 1] * p / PRECISION amountsp[k + 1] = amountsp[k + 1] * p / PRECISION D: uint256 = math.newton_D(A, gamma, xp, 0) d_token: uint256 = token_supply * D / D0 if deposit: d_token -= token_supply else: d_token = token_supply - d_token return d_token, amountsp, xp @internal @view def _calc_withdraw_one_coin( token_amount: uint256, i: uint256, swap: address ) -> (uint256, uint256): token_supply: uint256 = Curve(swap).totalSupply() assert token_amount <= token_supply # dev: token amount more than supply assert i < N_COINS # dev: coin out of range math: Math = Curve(swap).MATH() xx: uint256[N_COINS] = empty(uint256[N_COINS]) price_scale: uint256[N_COINS-1] = empty(uint256[N_COINS-1]) for k in range(N_COINS): xx[k] = Curve(swap).balances(k) if k > 0: price_scale[k - 1] = Curve(swap).price_scale(k - 1) precisions: uint256[N_COINS] = Curve(swap).precisions() A: uint256 = Curve(swap).A() gamma: uint256 = Curve(swap).gamma() xp: uint256[N_COINS] = precisions D0: uint256 = 0 p: uint256 = 0 price_scale_i: uint256 = PRECISION * precisions[0] xp[0] *= xx[0] for k in range(1, N_COINS): p = price_scale[k-1] if i == k: price_scale_i = p * xp[i] xp[k] = xp[k] * xx[k] * p / PRECISION if Curve(swap).future_A_gamma_time() > block.timestamp: D0 = math.newton_D(A, gamma, xp, 0) else: D0 = Curve(swap).D() D: uint256 = D0 fee: uint256 = self._fee(xp, swap) dD: uint256 = token_amount * D / token_supply D_fee: uint256 = fee * dD / (2 * 10**10) + 1 approx_fee: uint256 = N_COINS * D_fee * xx[i] / D D -= (dD - D_fee) y_out: uint256[2] = math.get_y(A, gamma, xp, D, i) dy: uint256 = (xp[i] - y_out[0]) * PRECISION / price_scale_i xp[i] = y_out[0] return dy, approx_fee @internal @view def _fee(xp: uint256[N_COINS], swap: address) -> uint256: math: Math = Curve(swap).MATH() packed_fee_params: uint256 = Curve(swap).packed_fee_params() fee_params: uint256[3] = self._unpack(packed_fee_params) f: uint256 = math.reduction_coefficient(xp, fee_params[2]) return (fee_params[0] * f + fee_params[1] * (10**18 - f)) / 10**18 @internal @view def _prep_calc(swap: address) -> ( uint256[N_COINS], uint256, uint256, uint256[N_COINS-1], uint256, uint256, uint256[N_COINS] ): precisions: uint256[N_COINS] = Curve(swap).precisions() token_supply: uint256 = Curve(swap).totalSupply() xp: uint256[N_COINS] = empty(uint256[N_COINS]) for k in range(N_COINS): xp[k] = Curve(swap).balances(k) price_scale: uint256[N_COINS - 1] = empty(uint256[N_COINS - 1]) for k in range(N_COINS - 1): price_scale[k] = Curve(swap).price_scale(k) A: uint256 = Curve(swap).A() gamma: uint256 = Curve(swap).gamma() D: uint256 = self._calc_D_ramp( A, gamma, xp, precisions, price_scale, swap ) return xp, D, token_supply, price_scale, A, gamma, precisions @internal @view def _unpack(_packed: uint256) -> uint256[3]: """ @notice Unpacks a uint256 into 3 integers (values must be <= 10**18) @param val The uint256 to unpack @return The unpacked uint256[3] """ return [ (_packed >> 128) & 18446744073709551615, (_packed >> 64) & 18446744073709551615, _packed & 18446744073709551615, ]
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"stateMutability":"view","type":"function","name":"get_dy","inputs":[{"name":"i","type":"uint256"},{"name":"j","type":"uint256"},{"name":"dx","type":"uint256"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"get_dx","inputs":[{"name":"i","type":"uint256"},{"name":"j","type":"uint256"},{"name":"dy","type":"uint256"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"calc_withdraw_one_coin","inputs":[{"name":"token_amount","type":"uint256"},{"name":"i","type":"uint256"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"calc_token_amount","inputs":[{"name":"amounts","type":"uint256[3]"},{"name":"deposit","type":"bool"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"calc_fee_get_dy","inputs":[{"name":"i","type":"uint256"},{"name":"j","type":"uint256"},{"name":"dx","type":"uint256"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"calc_fee_withdraw_one_coin","inputs":[{"name":"token_amount","type":"uint256"},{"name":"i","type":"uint256"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"calc_fee_token_amount","inputs":[{"name":"amounts","type":"uint256[3]"},{"name":"deposit","type":"bool"},{"name":"swap","type":"address"}],"outputs":[{"name":"","type":"uint256"}]}]
Contract Creation Code
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.