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Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Vyper_contract
- Optimization enabled
- false
- Compiler version
- v0.2.8
- Verified at
- 2022-07-13T09:39:45.181583Z
Constructor Arguments
000000000000000000000000217d950570b256774d3b824723f7570f5e1c6fbf000000000000000000000000217d950570b256774d3b824723f7570f5e1c6fbf0000000000000000000000001153335a3c0f3c2036d239f3a378aa149101d56900000000000000000000000011cc35ceec84058a61705fe219496d67c0834a4d0000000000000000000000004b6a673b282442543f81d88c79f4754f42de4993
Contract source code
# @version 0.2.8
"""
@title "Zap" Depositer for permissionless USD metapools
@author Curve.Fi
@license Copyright (c) Curve.Fi, 2021 - all rights reserved
"""
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 decimals() -> uint256: view
def balanceOf(_owner: address) -> uint256: view
interface CurveMeta:
def add_liquidity(amounts: uint256[N_COINS], min_mint_amount: uint256, _receiver: address) -> uint256: nonpayable
def remove_liquidity(_amount: uint256, min_amounts: uint256[N_COINS]) -> uint256[N_COINS]: nonpayable
def remove_liquidity_one_coin(_token_amount: uint256, i: int128, min_amount: uint256, _receiver: address) -> uint256: nonpayable
def remove_liquidity_imbalance(amounts: uint256[N_COINS], max_burn_amount: uint256) -> uint256: nonpayable
def calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> uint256: view
def calc_token_amount(amounts: uint256[N_COINS], deposit: bool) -> uint256: view
def coins(i: uint256) -> address: view
interface CurveBase:
def add_liquidity(amounts: uint256[BASE_N_COINS], min_mint_amount: uint256): nonpayable
def remove_liquidity(_amount: uint256, min_amounts: uint256[BASE_N_COINS]): nonpayable
def remove_liquidity_one_coin(_token_amount: uint256, i: int128, min_amount: uint256): nonpayable
def remove_liquidity_imbalance(amounts: uint256[BASE_N_COINS], max_burn_amount: uint256): nonpayable
def calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> uint256: view
def calc_token_amount(amounts: uint256[BASE_N_COINS], deposit: bool) -> uint256: view
def coins(i: uint256) -> address: view
def fee() -> uint256: view
N_COINS: constant(int128) = 2
MAX_COIN: constant(int128) = N_COINS-1
BASE_N_COINS: constant(int128) = 3
N_ALL_COINS: constant(int128) = N_COINS + BASE_N_COINS - 1
FEE_DENOMINATOR: constant(uint256) = 10 ** 10
FEE_IMPRECISION: constant(uint256) = 100 * 10 ** 8 # % of the fee
base_pool: public(address)
base_lp_token: public(address)
base_coins: public(address[3])
# coin -> pool -> is approved to transfer?
is_approved: HashMap[address, HashMap[address, bool]]
@external
def __init__(_base_pool: address,_base_lp_token: address,_base_coins:address[3]):
"""
@notice Contract constructor
"""
self.base_pool = _base_pool
self.base_lp_token = _base_lp_token
self.base_coins = _base_coins
base_coins: address[3] = self.base_coins
for coin in base_coins:
ERC20(coin).approve(self.base_pool, MAX_UINT256)
@external
def add_liquidity(
_pool: address,
_deposit_amounts: uint256[N_ALL_COINS],
_min_mint_amount: uint256,
_receiver: address = msg.sender,
) -> uint256:
"""
@notice Wrap underlying coins and deposit them into `_pool`
@param _pool Address of the pool to deposit into
@param _deposit_amounts List of amounts of underlying coins to deposit
@param _min_mint_amount Minimum amount of LP tokens to mint from the deposit
@param _receiver Address that receives the LP tokens
@return Amount of LP tokens received by depositing
"""
meta_amounts: uint256[N_COINS] = empty(uint256[N_COINS])
base_amounts: uint256[BASE_N_COINS] = empty(uint256[BASE_N_COINS])
deposit_base: bool = False
base_coins: address[3] = self.base_coins
if _deposit_amounts[0] != 0:
coin: address = CurveMeta(_pool).coins(0)
if not self.is_approved[coin][_pool]:
ERC20(coin).approve(_pool, MAX_UINT256)
self.is_approved[coin][_pool] = True
ERC20(coin).transferFrom(msg.sender, self, _deposit_amounts[0])
meta_amounts[0] = _deposit_amounts[0]
for i in range(1, N_ALL_COINS):
amount: uint256 = _deposit_amounts[i]
if amount == 0:
continue
deposit_base = True
base_idx: uint256 = i - 1
coin: address = base_coins[base_idx]
ERC20(coin).transferFrom(msg.sender, self, amount)
# Handle potential Tether fees
if i == N_ALL_COINS - 1:
base_amounts[base_idx] = ERC20(coin).balanceOf(self)
else:
base_amounts[base_idx] = amount
# Deposit to the base pool
if deposit_base:
coin: address = self.base_lp_token
CurveBase(self.base_pool).add_liquidity(base_amounts, 0)
meta_amounts[MAX_COIN] = ERC20(coin).balanceOf(self)
if not self.is_approved[coin][_pool]:
ERC20(coin).approve(_pool, MAX_UINT256)
self.is_approved[coin][_pool] = True
# Deposit to the meta pool
return CurveMeta(_pool).add_liquidity(meta_amounts, _min_mint_amount, _receiver)
@external
def remove_liquidity(
_pool: address,
_burn_amount: uint256,
_min_amounts: uint256[N_ALL_COINS],
_receiver: address = msg.sender
) -> uint256[N_ALL_COINS]:
"""
@notice Withdraw and unwrap coins from the pool
@dev Withdrawal amounts are based on current deposit ratios
@param _pool Address of the pool to deposit into
@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 LP tokens
@return List of amounts of underlying coins that were withdrawn
"""
ERC20(_pool).transferFrom(msg.sender, self, _burn_amount)
min_amounts_base: uint256[BASE_N_COINS] = empty(uint256[BASE_N_COINS])
amounts: uint256[N_ALL_COINS] = empty(uint256[N_ALL_COINS])
# Withdraw from meta
meta_received: uint256[N_COINS] = CurveMeta(_pool).remove_liquidity(
_burn_amount,
[_min_amounts[0], convert(0, uint256)]
)
# Withdraw from base
for i in range(BASE_N_COINS):
min_amounts_base[i] = _min_amounts[MAX_COIN+i]
CurveBase(self.base_pool).remove_liquidity(meta_received[1], min_amounts_base)
# Transfer all coins out
coin: address = CurveMeta(_pool).coins(0)
ERC20(coin).transfer(_receiver, meta_received[0])
amounts[0] = meta_received[0]
base_coins: address[BASE_N_COINS] = self.base_coins
for i in range(1, N_ALL_COINS):
coin = base_coins[i-1]
amounts[i] = ERC20(coin).balanceOf(self)
ERC20(coin).transfer(_receiver, amounts[i])
return amounts
@external
def remove_liquidity_one_coin(
_pool: address,
_burn_amount: uint256,
i: int128,
_min_amount: uint256,
_receiver: address=msg.sender
) -> uint256:
"""
@notice Withdraw and unwrap a single coin from the pool
@param _pool Address of the pool to deposit into
@param _burn_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 underlying coin to receive
@param _receiver Address that receives the LP tokens
@return Amount of underlying coin received
"""
ERC20(_pool).transferFrom(msg.sender, self, _burn_amount)
coin_amount: uint256 = 0
if i == 0:
coin_amount = CurveMeta(_pool).remove_liquidity_one_coin(_burn_amount, i, _min_amount, _receiver)
else:
base_coins: address[BASE_N_COINS] = self.base_coins
coin: address = base_coins[i - MAX_COIN]
# Withdraw a base pool coin
coin_amount = CurveMeta(_pool).remove_liquidity_one_coin(_burn_amount, MAX_COIN, 0, self)
CurveBase(self.base_pool).remove_liquidity_one_coin(coin_amount, i-MAX_COIN, _min_amount)
coin_amount = ERC20(coin).balanceOf(self)
ERC20(coin).transfer(_receiver, coin_amount)
return coin_amount
@external
def remove_liquidity_imbalance(
_pool: address,
_amounts: uint256[N_ALL_COINS],
_max_burn_amount: uint256,
_receiver: address=msg.sender
) -> uint256:
"""
@notice Withdraw coins from the pool in an imbalanced amount
@param _pool Address of the pool to deposit into
@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 LP tokens
@return Actual amount of the LP token burned in the withdrawal
"""
fee: uint256 = CurveBase(self.base_pool).fee() * BASE_N_COINS / (4 * (BASE_N_COINS - 1))
fee += fee * FEE_IMPRECISION / FEE_DENOMINATOR # Overcharge to account for imprecision
# Transfer the LP token in
ERC20(_pool).transferFrom(msg.sender, self, _max_burn_amount)
withdraw_base: bool = False
amounts_base: uint256[BASE_N_COINS] = empty(uint256[BASE_N_COINS])
amounts_meta: uint256[N_COINS] = empty(uint256[N_COINS])
# determine amounts to withdraw from base pool
for i in range(BASE_N_COINS):
amount: uint256 = _amounts[MAX_COIN + i]
if amount != 0:
amounts_base[i] = amount
withdraw_base = True
# determine amounts to withdraw from metapool
amounts_meta[0] = _amounts[0]
if withdraw_base:
amounts_meta[MAX_COIN] = CurveBase(self.base_pool).calc_token_amount(amounts_base, False)
amounts_meta[MAX_COIN] += amounts_meta[MAX_COIN] * fee / FEE_DENOMINATOR + 1
# withdraw from metapool and return the remaining LP tokens
burn_amount: uint256 = CurveMeta(_pool).remove_liquidity_imbalance(amounts_meta, _max_burn_amount)
ERC20(_pool).transfer(msg.sender, _max_burn_amount - burn_amount)
# withdraw from base pool
if withdraw_base:
CurveBase(self.base_pool).remove_liquidity_imbalance(amounts_base, amounts_meta[MAX_COIN])
coin: address = self.base_lp_token
leftover: uint256 = ERC20(coin).balanceOf(self)
if leftover > 0:
# if some base pool LP tokens remain, re-deposit them for the caller
if not self.is_approved[coin][_pool]:
ERC20(coin).approve(_pool, MAX_UINT256)
self.is_approved[coin][_pool] = True
burn_amount -= CurveMeta(_pool).add_liquidity([convert(0, uint256), leftover], 0, msg.sender)
# transfer withdrawn base pool tokens to caller
base_coins: address[BASE_N_COINS] = self.base_coins
for i in range(BASE_N_COINS):
ERC20(base_coins[i]).transfer(_receiver, amounts_base[i])
# transfer withdrawn metapool tokens to caller
if _amounts[0] > 0:
coin: address = CurveMeta(_pool).coins(0)
ERC20(coin).transfer(_receiver, _amounts[0])
return burn_amount
@view
@external
def calc_withdraw_one_coin(_pool: address, _token_amount: uint256, i: int128) -> uint256:
"""
@notice Calculate the amount received when withdrawing and unwrapping a single coin
@param _pool Address of the pool to deposit into
@param _token_amount Amount of LP tokens to burn in the withdrawal
@param i Index value of the underlying coin to withdraw
@return Amount of coin received
"""
if i < MAX_COIN:
return CurveMeta(_pool).calc_withdraw_one_coin(_token_amount, i)
else:
_base_tokens: uint256 = CurveMeta(_pool).calc_withdraw_one_coin(_token_amount, MAX_COIN)
return CurveBase(self.base_pool).calc_withdraw_one_coin(_base_tokens, i-MAX_COIN)
@view
@external
def calc_token_amount(_pool: address, _amounts: uint256[N_ALL_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 _pool Address of the pool to deposit into
@param _amounts Amount of each underlying coin being deposited
@param _is_deposit set True for deposits, False for withdrawals
@return Expected amount of LP tokens received
"""
meta_amounts: uint256[N_COINS] = empty(uint256[N_COINS])
base_amounts: uint256[BASE_N_COINS] = empty(uint256[BASE_N_COINS])
meta_amounts[0] = _amounts[0]
for i in range(BASE_N_COINS):
base_amounts[i] = _amounts[i + MAX_COIN]
base_tokens: uint256 = CurveBase(self.base_pool).calc_token_amount(base_amounts, _is_deposit)
meta_amounts[MAX_COIN] = base_tokens
return CurveMeta(_pool).calc_token_amount(meta_amounts, _is_deposit)
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","outputs":[],"inputs":[{"type":"address","name":"_base_pool"},{"type":"address","name":"_base_lp_token"},{"type":"address[3]","name":"_base_coins"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"add_liquidity","inputs":[{"type":"address","name":"_pool"},{"type":"uint256[4]","name":"_deposit_amounts"},{"type":"uint256","name":"_min_mint_amount"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"add_liquidity","inputs":[{"type":"address","name":"_pool"},{"type":"uint256[4]","name":"_deposit_amounts"},{"type":"uint256","name":"_min_mint_amount"},{"type":"address","name":"_receiver"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[4]","name":""}],"name":"remove_liquidity","inputs":[{"type":"address","name":"_pool"},{"type":"uint256","name":"_burn_amount"},{"type":"uint256[4]","name":"_min_amounts"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[4]","name":""}],"name":"remove_liquidity","inputs":[{"type":"address","name":"_pool"},{"type":"uint256","name":"_burn_amount"},{"type":"uint256[4]","name":"_min_amounts"},{"type":"address","name":"_receiver"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"remove_liquidity_one_coin","inputs":[{"type":"address","name":"_pool"},{"type":"uint256","name":"_burn_amount"},{"type":"int128","name":"i"},{"type":"uint256","name":"_min_amount"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"remove_liquidity_one_coin","inputs":[{"type":"address","name":"_pool"},{"type":"uint256","name":"_burn_amount"},{"type":"int128","name":"i"},{"type":"uint256","name":"_min_amount"},{"type":"address","name":"_receiver"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"remove_liquidity_imbalance","inputs":[{"type":"address","name":"_pool"},{"type":"uint256[4]","name":"_amounts"},{"type":"uint256","name":"_max_burn_amount"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":""}],"name":"remove_liquidity_imbalance","inputs":[{"type":"address","name":"_pool"},{"type":"uint256[4]","name":"_amounts"},{"type":"uint256","name":"_max_burn_amount"},{"type":"address","name":"_receiver"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":""}],"name":"calc_withdraw_one_coin","inputs":[{"type":"address","name":"_pool"},{"type":"uint256","name":"_token_amount"},{"type":"int128","name":"i"}],"gas":2450},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":""}],"name":"calc_token_amount","inputs":[{"type":"address","name":"_pool"},{"type":"uint256[4]","name":"_amounts"},{"type":"bool","name":"_is_deposit"}],"gas":3517},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":""}],"name":"base_pool","inputs":[],"gas":1241},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":""}],"name":"base_lp_token","inputs":[],"gas":1271},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":""}],"name":"base_coins","inputs":[{"type":"uint256","name":"arg0"}],"gas":1410}]
Contract Creation Code
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