Contract Source Code (Vyper language format)

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# 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,
    ]

• 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"}]}]

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