Contract 0x492cd2290e5b971eab622d6325cef6a329cf8a58 7

Txn Hash Method
Block
From
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Value [Txn Fee]
0x5ea5e04662c40a692b5ea0257fa0e35b2d925600c6a501bf8d11f49e61fb1129Withdraw319472302024-01-14 21:35:5538 days 23 hrs ago0x1ffaf539ab9c3856ecd499da4ef695de514532ec IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0015747498
0x4ecf820670bd513fe4574398d65457f08ca15844b7ea954a4252423877631576Deposit319468152024-01-14 20:59:2039 days 17 mins ago0x1ffaf539ab9c3856ecd499da4ef695de514532ec IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.008273586
0xf498589890af4a590003453bb0ce124ebef4cc46be451d43dec938c63139cbe7Withdraw319337572024-01-14 1:22:2039 days 19 hrs ago0x72195dda0361f43ce544b750f318d04b35836933 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.001167247626
0xf25db85ab6c133184fde9a08cd35b3a8b25ed908c3d3a6a80bf3cd377622d4e0Deposit319334592024-01-14 0:55:2039 days 20 hrs ago0x72195dda0361f43ce544b750f318d04b35836933 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.002677813047
0x54e28146c158c89f396023b59e65e5f11aeaca69c149eb8b61f96b8ff6c64d97Deposit313479662023-12-09 2:36:0575 days 18 hrs ago0x831db56a947c2a680a0ac4700a87f98db32328d8 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.003926001
0xddd05b414903a7f28e0f9de81f3e336cd6a901925f0d41fb0a47e53d13ea32ecWithdraw313176842023-12-07 6:32:4077 days 14 hrs ago0x1415517e51cd6b8cca8c1da56400ff47aab03644 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0004441074
0xd76fa943d3aa968620e3e33ffca01ca261098144ea5798b19822211b2a5ec04eDeposit313175692023-12-07 6:22:3077 days 14 hrs ago0x1415517e51cd6b8cca8c1da56400ff47aab03644 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0007723512
0xbe069bdd08b899ebb38b126d2731db5228db26a064acece86a54a0b643ef4adaWithdraw313084092023-12-06 17:02:0578 days 4 hrs ago0x59c6d0c21d9700f3dbd25c7533c87eba53ffbfff IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0004845096
0x712ccfc5de6873d0e2610d48153d11eef01fa2322edc568d414a73cb7f10caf9Withdraw313083562023-12-06 16:57:2078 days 4 hrs ago0x0754f1df5f57c969e82a4e6e9d1f1c7d04df7587 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0007469079
0xe8232479a9b9c18b6435dbdcb43b778086fd9989658f7862edb2b4bc48f66984Deposit313083032023-12-06 16:52:2578 days 4 hrs ago0x59c6d0c21d9700f3dbd25c7533c87eba53ffbfff IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0009491184
0x607f166d004bfa65988d81c5e29c2984795575a0bc60a5cdefdf0b9fd011daa0Deposit313076282023-12-06 15:53:1078 days 5 hrs ago0x0754f1df5f57c969e82a4e6e9d1f1c7d04df7587 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.000790896
0x453498984eeb01f22ba49f2b57d1035d0f989783b6c70e9a6283b4fe2f3c0c63Withdraw313022622023-12-06 8:03:5078 days 13 hrs ago0x4d68bf377995c478bb8d3bb1ede71502c7e55e94 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0037347615
0x171edaa3962745fd68ead9607af3d5b27c443f0e7c810b6a28926912c2552204Deposit313022432023-12-06 8:02:1078 days 13 hrs ago0x4d68bf377995c478bb8d3bb1ede71502c7e55e94 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.004874343
0x9f1e32908c8820088f1d14da03b74be5712517dc2438ce112f2001543c9ef941Withdraw312959342023-12-05 22:55:1078 days 22 hrs ago0x2446f1a75162f045d02f23d1d3b0f5a2c0f9a4cb IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.001566919931
0x68b6b38bc874fe819be435092e42e5777e23e0d6809e61c5a854b9cf46f4d78aDeposit312959262023-12-05 22:54:3078 days 22 hrs ago0x2446f1a75162f045d02f23d1d3b0f5a2c0f9a4cb IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.001475292979
0xe94ee873547a76357301b74691f83c9887d8aa9f6cbcb259b012abdecbfce284Deposit312959082023-12-05 22:53:0078 days 22 hrs ago0x2446f1a75162f045d02f23d1d3b0f5a2c0f9a4cb IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.00324938591
0x2d9727d159adcbf4d1965e235247dc74465816f16c2c81ad5da17139230934f5Withdraw312956852023-12-05 22:33:3578 days 22 hrs ago0xdac7a91516112703448b5d1fbc8b679fce838e8a IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.002599281073
0x775903738cf135b59d68de9fc1b1376241e1752235fad249aeb9fe36d15585a4Deposit312956492023-12-05 22:30:3578 days 22 hrs ago0xdac7a91516112703448b5d1fbc8b679fce838e8a IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.00370523648
0x4c1d98fcbbce3ecf9a696477419bfdc196ae9bc0edd8a7a11bc018f3202cce54Deposit312915572023-12-05 16:34:4579 days 4 hrs ago0x4a228f14d2130e8e4636418b52aaf3d6b4e887d3 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.002057888
0x7f9bd948bc5556ac257c8a9e0a3b7a5b586404d331ac56dae4783b1d8d64cb37Withdraw312882312023-12-05 11:41:3579 days 9 hrs ago0x108706524972d0e44936b34109de5bf18ed60c67 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0012921024
0x45f8849f7514600c50eb2dc7abe1df4a76889c32ff967c26a8f91e91b4c9b59bDeposit312882152023-12-05 11:40:0579 days 9 hrs ago0x108706524972d0e44936b34109de5bf18ed60c67 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.0026629256
0x71daea0d9668440968d1f12fa0aa2ec825343eecbfb245f1ef4b05c8128a9194Withdraw312544692023-12-03 10:33:0581 days 10 hrs ago0xa9e14c1df751dc3e710fcb3a92019667ae7fcf2d IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.000619023909
0xb1b4a0c712c80b67b0eb174799160db1d5315c09138a41f69ed913e7c45a379eDeposit312544312023-12-03 10:29:3081 days 10 hrs ago0xa9e14c1df751dc3e710fcb3a92019667ae7fcf2d IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.000706132269
0x076f76d71b0acb0135263d7b4e8d7d87525ce83a33b90ee19b08f799535670faDeposit312543792023-12-03 10:25:1081 days 10 hrs ago0xa9e14c1df751dc3e710fcb3a92019667ae7fcf2d IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.000345741393
0x44b47d7a67b8ea12d8c6e581d68632ab43cb3a69375d00d10366e1c8831bc08eWithdraw311746592023-11-28 13:56:5586 days 7 hrs ago0xa91ca713efb16824297922ba00499490f6df94b0 IN  0x492cd2290e5b971eab622d6325cef6a329cf8a580 xDAI0.002277774339
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0xe6439eb37a104d175e42e7d1fd04acb85e03edd91e3658000352c574b8c71e8e294908362023-08-16 14:51:55190 days 6 hrs ago 0x83e443ef4f9963c77bd860f94500075556668cb8  Contract Creation0 xDAI
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Minimal Proxy Contract for 0x96484f2abf5e58b15176dbf1a799627b53f13b6d

Contract Name:
Vyper_contract

Compiler Version
vyper:0.3.3

Optimization Enabled:
N/A

Other Settings:
, MIT license
Decompile ByteCode

Contract Source Code (Vyper language format)

# @version 0.3.3
"""
@title Child Liquidity Gauge
@license MIT
@author Curve Finance
"""
from vyper.interfaces import ERC20

implements: ERC20


interface ERC20Extended:
    def symbol() -> String[26]: view

interface Minter:
    def minted(_user: address, _gauge: address) -> uint256: view
    def getBalancerToken() -> address: view

interface ERC1271:
    def isValidSignature(_hash: bytes32, _signature: Bytes[65]) -> bytes32: view

interface AuthorizerAdaptor:
    def getVault() -> address: view

interface VotingEscrowDelegationProxy:
    def totalSupply() -> uint256: view
    def adjustedBalanceOf(_account: address) -> uint256: view


event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

event Deposit:
    _user: indexed(address)
    _value: uint256

event Withdraw:
    _user: indexed(address)
    _value: uint256

event UpdateLiquidityLimit:
    _user: indexed(address)
    _original_balance: uint256
    _original_supply: uint256
    _working_balance: uint256
    _working_supply: uint256


struct Reward:
    distributor: address
    period_finish: uint256
    rate: uint256
    last_update: uint256
    integral: uint256


DOMAIN_TYPE_HASH: constant(bytes32) = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
PERMIT_TYPE_HASH: constant(bytes32) = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")
ERC1271_MAGIC_VAL: constant(bytes32) = 0x1626ba7e00000000000000000000000000000000000000000000000000000000

MAX_REWARDS: constant(uint256) = 8
TOKENLESS_PRODUCTION: constant(uint256) = 40
WEEK: constant(uint256) = 86400 * 7


BAL: immutable(address)
BAL_PSEUDO_MINTER: immutable(address)
VE_DELEGATION_PROXY: immutable(address)
BAL_VAULT: immutable(address)
AUTHORIZER_ADAPTOR: immutable(address)

DOMAIN_SEPARATOR: public(bytes32)
nonces: public(HashMap[address, uint256])

name: public(String[64])
symbol: public(String[32])

_allowance: HashMap[address, HashMap[address, uint256]]
balanceOf: public(HashMap[address, uint256])
totalSupply: public(uint256)

lp_token: public(address)
version: public(String[128])
factory: public(address)

working_balances: public(HashMap[address, uint256])
working_supply: public(uint256)

period: public(uint256)
period_timestamp: public(HashMap[uint256, uint256])

integrate_checkpoint_of: public(HashMap[address, uint256])
integrate_fraction: public(HashMap[address, uint256])
integrate_inv_supply: public(HashMap[uint256, uint256])
integrate_inv_supply_of: public(HashMap[address, uint256])

# For tracking external rewards
reward_count: public(uint256)
reward_tokens: public(address[MAX_REWARDS])
reward_data: public(HashMap[address, Reward])
# claimant -> default reward receiver
rewards_receiver: public(HashMap[address, address])
# reward token -> claiming address -> integral
reward_integral_for: public(HashMap[address, HashMap[address, uint256]])
# user -> token -> [uint128 claimable amount][uint128 claimed amount]
claim_data: HashMap[address, HashMap[address, uint256]]

is_killed: public(bool)
inflation_rate: public(HashMap[uint256, uint256])


@external
def __init__(
    _voting_escrow_delegation_proxy: address,
    _bal_pseudo_minter: address,
    _authorizer_adaptor: address,
    _version: String[128]
):
    self.lp_token = 0x000000000000000000000000000000000000dEaD
    self.version = _version
    self.factory = 0x000000000000000000000000000000000000dEaD

    VE_DELEGATION_PROXY = _voting_escrow_delegation_proxy
    BAL_PSEUDO_MINTER = _bal_pseudo_minter
    BAL = Minter(_bal_pseudo_minter).getBalancerToken()
    AUTHORIZER_ADAPTOR = _authorizer_adaptor
    BAL_VAULT = AuthorizerAdaptor(_authorizer_adaptor).getVault()


@internal
def _checkpoint(_user: address):
    """
    @notice Checkpoint a user calculating their BAL entitlement
    @param _user User address
    """
    period: uint256 = self.period
    period_time: uint256 = self.period_timestamp[period]
    integrate_inv_supply: uint256 = self.integrate_inv_supply[period]

    # If killed, we skip accumulating inflation in `integrate_inv_supply`
    if block.timestamp > period_time and not self.is_killed:

        working_supply: uint256 = self.working_supply
        prev_week_time: uint256 = period_time
        week_time: uint256 = min((period_time + WEEK) / WEEK * WEEK, block.timestamp)

        for i in range(256):
            dt: uint256 = week_time - prev_week_time

            if working_supply != 0:
                # we don't have to worry about crossing inflation epochs
                # and if we miss any weeks, those weeks inflation rates will be 0 for sure
                # but that means no one interacted with the gauge for that long
                integrate_inv_supply += self.inflation_rate[prev_week_time / WEEK] * 10 ** 18 * dt / working_supply

            if week_time == block.timestamp:
                break
            prev_week_time = week_time
            week_time = min(week_time + WEEK, block.timestamp)

    # check BAL balance and increase weekly inflation rate by delta for the rest of the week
    bal_balance: uint256 = ERC20(BAL).balanceOf(self)
    if bal_balance != 0:
        current_week: uint256 = block.timestamp / WEEK
        self.inflation_rate[current_week] += bal_balance / ((current_week + 1) * WEEK - block.timestamp)
        ERC20(BAL).transfer(BAL_PSEUDO_MINTER, bal_balance)

    period += 1
    self.period = period
    self.period_timestamp[period] = block.timestamp
    self.integrate_inv_supply[period] = integrate_inv_supply

    working_balance: uint256 = self.working_balances[_user]
    self.integrate_fraction[_user] += working_balance * (integrate_inv_supply - self.integrate_inv_supply_of[_user]) / 10 ** 18
    self.integrate_inv_supply_of[_user] = integrate_inv_supply
    self.integrate_checkpoint_of[_user] = block.timestamp


@internal
def _update_liquidity_limit(_user: address, _user_balance: uint256, _total_supply: uint256):
    """
    @notice Calculate working balances to apply amplification of BAL production.
    @param _user The user address
    @param _user_balance User's amount of liquidity (LP tokens)
    @param _total_supply Total amount of liquidity (LP tokens)
    """
    working_balance: uint256 = _user_balance * TOKENLESS_PRODUCTION / 100

    ve: address = VE_DELEGATION_PROXY
    if ve != ZERO_ADDRESS:
        ve_ts: uint256 = VotingEscrowDelegationProxy(ve).totalSupply()
        if ve_ts != 0:
            ve_user_balance: uint256 = VotingEscrowDelegationProxy(ve).adjustedBalanceOf(_user)
            working_balance += _total_supply * ve_user_balance / ve_ts * (100 - TOKENLESS_PRODUCTION) / 100
            working_balance = min(_user_balance, working_balance)

    old_working_balance: uint256 = self.working_balances[_user]
    self.working_balances[_user] = working_balance

    working_supply: uint256 = self.working_supply + working_balance - old_working_balance
    self.working_supply = working_supply

    log UpdateLiquidityLimit(_user, _user_balance, _total_supply, working_balance, working_supply)


@view
@internal
def _all_indexes() -> DynArray[uint256, MAX_REWARDS]:
    indexes: DynArray[uint256, MAX_REWARDS] = []
    for i in range(MAX_REWARDS):
        if i >= self.reward_count:
            break
        indexes.append(i)

    return indexes


@internal
def _checkpoint_rewards(
    _user: address,
    _total_supply: uint256,
    _claim: bool,
    _receiver: address,
    _input_reward_indexes: DynArray[uint256, MAX_REWARDS]
):
    """
    @notice Claim pending rewards and checkpoint rewards for a user
    """
    user_balance: uint256 = 0
    receiver: address = _receiver
    if _user != ZERO_ADDRESS:
        user_balance = self.balanceOf[_user]
        if _claim and _receiver == ZERO_ADDRESS:
            # if receiver is not explicitly declared, check if a default receiver is set
            receiver = self.rewards_receiver[_user]
            if receiver == ZERO_ADDRESS:
                # if no default receiver is set, direct claims to the user
                receiver = _user

    reward_count: uint256 = self.reward_count
    reward_indexes: DynArray[uint256, MAX_REWARDS] = []
    if len(_input_reward_indexes) == 0:
        reward_indexes = self._all_indexes()
    else:
        reward_indexes = _input_reward_indexes

    for i in reward_indexes:
        assert i < reward_count, "INVALID_REWARD_INDEX"

        token: address = self.reward_tokens[i]

        integral: uint256 = self.reward_data[token].integral
        last_update: uint256 = min(block.timestamp, self.reward_data[token].period_finish)
        duration: uint256 = last_update - self.reward_data[token].last_update
        if duration != 0:
            self.reward_data[token].last_update = last_update
            if _total_supply != 0:
                integral += duration * self.reward_data[token].rate * 10**18 / _total_supply
                self.reward_data[token].integral = integral

        if _user != ZERO_ADDRESS:
            integral_for: uint256 = self.reward_integral_for[token][_user]
            new_claimable: uint256 = 0

            if integral_for < integral:
                self.reward_integral_for[token][_user] = integral
                new_claimable = user_balance * (integral - integral_for) / 10**18

            claim_data: uint256 = self.claim_data[_user][token]
            total_claimable: uint256 = shift(claim_data, -128) + new_claimable
            if total_claimable > 0:
                total_claimed: uint256 = claim_data % 2**128
                if _claim:
                    response: Bytes[32] = raw_call(
                        token,
                        _abi_encode(
                            receiver,
                            total_claimable,
                            method_id=method_id("transfer(address,uint256)")
                        ),
                        max_outsize=32,
                    )
                    if len(response) != 0:
                        assert convert(response, bool), "TRANSFER_FAILURE"
                    self.claim_data[_user][token] = total_claimed + total_claimable
                elif new_claimable > 0:
                    self.claim_data[_user][token] = total_claimed + shift(total_claimable, 128)


@internal
def _transfer(_from: address, _to: address, _value: uint256):
    if _value == 0:
        return
    total_supply: uint256 = self.totalSupply

    has_rewards: bool = self.reward_count != 0
    for addr in [_from, _to]:
        self._checkpoint(addr)
        # We need to checkpoint all of the rewards before affecting the gauge token balance for a user,
        # but to do it safely we need to skip making external calls. Therefore, we set _claim to False.
        self._checkpoint_rewards(addr, total_supply, False, ZERO_ADDRESS, [])

    new_balance: uint256 = self.balanceOf[_from] - _value
    self.balanceOf[_from] = new_balance
    self._update_liquidity_limit(_from, new_balance, total_supply)

    new_balance = self.balanceOf[_to] + _value
    self.balanceOf[_to] = new_balance
    self._update_liquidity_limit(_to, new_balance, total_supply)

    log Transfer(_from, _to, _value)


@external
@nonreentrant("lock")
def deposit(_value: uint256, _user: address = msg.sender):
    """
    @notice Deposit `_value` LP tokens
    @param _value Number of tokens to deposit
    @param _user The account to send gauge tokens to
    """
    self._checkpoint(_user)
    if _value == 0:
        return

    total_supply: uint256 = self.totalSupply
    new_balance: uint256 = self.balanceOf[_user] + _value

    if self.reward_count != 0:
        # We need to checkpoint all of the rewards before affecting the gauge token balance for a user,
        # but to do it safely we need to skip making external calls. Therefore, we set _claim to False.
        self._checkpoint_rewards(_user, total_supply, False, ZERO_ADDRESS, [])

    total_supply += _value

    self.balanceOf[_user] = new_balance
    self.totalSupply = total_supply

    self._update_liquidity_limit(_user, new_balance, total_supply)

    ERC20(self.lp_token).transferFrom(msg.sender, self, _value)

    log Deposit(_user, _value)
    log Transfer(ZERO_ADDRESS, _user, _value)


@external
@nonreentrant("lock")
def withdraw(_value: uint256, _user: address = msg.sender):
    """
    @notice Withdraw `_value` LP tokens
    @param _value Number of tokens to withdraw
    @param _user The account to send LP tokens to
    """
    self._checkpoint(_user)
    if _value == 0:
        return

    total_supply: uint256 = self.totalSupply
    new_balance: uint256 = self.balanceOf[msg.sender] - _value

    if self.reward_count != 0:
        # We need to checkpoint all of the rewards before affecting the gauge token balance for a user,
        # but to do it safely we need to skip making external calls. Therefore, we set _claim to False.
        self._checkpoint_rewards(_user, total_supply, False, ZERO_ADDRESS, [])

    total_supply -= _value

    self.balanceOf[msg.sender] = new_balance
    self.totalSupply = total_supply

    self._update_liquidity_limit(msg.sender, new_balance, total_supply)

    ERC20(self.lp_token).transfer(_user, _value)

    log Withdraw(_user, _value)
    log Transfer(msg.sender, ZERO_ADDRESS, _value)


@view
@internal
def _get_allowance(owner: address, spender: address) -> uint256:
    """
     @dev Override to grant the Vault infinite allowance, causing for Gauge Tokens to not require approval.
     This is sound as the Vault already provides authorization mechanisms when initiating token transfers, which this
     contract inherits.
    """
    if (spender == BAL_VAULT):
        return MAX_UINT256
    return self._allowance[owner][spender]

@external
@nonreentrant("lock")
def transferFrom(_from: address, _to: address, _value: uint256) -> bool:
    """
    @notice Transfer tokens from one address to another
    @param _from The address which you want to send tokens from
    @param _to The address which you want to transfer to
    @param _value the amount of tokens to be transferred
    @return bool success
    """
    allowance: uint256 = self._get_allowance(_from, msg.sender)
    if allowance != MAX_UINT256:
        self._allowance[_from][msg.sender] = allowance - _value

    self._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. This may be mitigated with the use of
         {increaseAllowance} and {decreaseAllowance}.
         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


@external
def permit(
    _owner: address,
    _spender: address,
    _value: uint256,
    _deadline: uint256,
    _v: uint8,
    _r: bytes32,
    _s: bytes32
) -> bool:
    """
    @notice Approves spender by owner's signature to expend owner's tokens.
        See https://eips.ethereum.org/EIPS/eip-2612.
    @dev Inspired by https://github.com/yearn/yearn-vaults/blob/main/contracts/Vault.vy#L753-L793
    @dev Supports smart contract wallets which implement ERC1271
        https://eips.ethereum.org/EIPS/eip-1271
    @param _owner The address which is a source of funds and has signed the Permit.
    @param _spender The address which is allowed to spend the funds.
    @param _value The amount of tokens to be spent.
    @param _deadline The timestamp after which the Permit is no longer valid.
    @param _v The bytes[64] of the valid secp256k1 signature of permit by owner
    @param _r The bytes[0:32] of the valid secp256k1 signature of permit by owner
    @param _s The bytes[32:64] of the valid secp256k1 signature of permit by owner
    @return True, if transaction completes successfully
    """
    assert _owner != ZERO_ADDRESS, "INVALID_OWNER"
    assert block.timestamp <= _deadline, "DEADLINE_EXPIRED"

    nonce: uint256 = self.nonces[_owner]
    digest: bytes32 = keccak256(
        concat(
            b"\x19\x01",
            self.DOMAIN_SEPARATOR,
            keccak256(_abi_encode(PERMIT_TYPE_HASH, _owner, _spender, _value, nonce, _deadline))
        )
    )

    if _owner.is_contract:
        sig: Bytes[65] = concat(_abi_encode(_r, _s), slice(convert(_v, bytes32), 31, 1))
        assert ERC1271(_owner).isValidSignature(digest, sig) == ERC1271_MAGIC_VAL, "INVALID_SIG"
    else:
        recovered_address: address = ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256))
        assert recovered_address == _owner,"INVALID_SIG"

    self._allowance[_owner][_spender] = _value
    self.nonces[_owner] = nonce + 1

    log Approval(_owner, _spender, _value)
    return True


@external
@nonreentrant("lock")
def transfer(_to: address, _value: uint256) -> bool:
    """
    @notice Transfer token to a specified address
    @param _to The address to transfer to
    @param _value The amount to be transferred
    @return bool success
    """
    self._transfer(msg.sender, _to, _value)
    return True


@external
def increaseAllowance(_spender: address, _added_value: uint256) -> bool:
    """
    @notice Increase the allowance granted to `_spender` by the caller
    @dev This is alternative to {approve} that can be used as a mitigation for
         the potential race condition
    @param _spender The address which will transfer the funds
    @param _added_value The amount of to increase the allowance
    @return bool success
    """
    allowance: uint256 = self._get_allowance(msg.sender, _spender) + _added_value
    self._allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True


@external
def decreaseAllowance(_spender: address, _subtracted_value: uint256) -> bool:
    """
    @notice Decrease the allowance granted to `_spender` by the caller
    @dev This is alternative to {approve} that can be used as a mitigation for
         the potential race condition
    @param _spender The address which will transfer the funds
    @param _subtracted_value The amount of to decrease the allowance
    @return bool success
    """
    allowance: uint256 = self._get_allowance(msg.sender, _spender) - _subtracted_value
    self._allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True


@external
def user_checkpoint(addr: address) -> bool:
    """
    @notice Record a checkpoint for `addr`
    @param addr User address
    @return bool success
    """
    self._checkpoint(addr)
    self._update_liquidity_limit(addr, self.balanceOf[addr], self.totalSupply)
    return True


@external
def claimable_tokens(addr: address) -> uint256:
    """
    @notice Get the number of claimable tokens per user
    @dev This function should be manually changed to "view" in the ABI
    @return uint256 number of claimable tokens per user
    """
    self._checkpoint(addr)
    return self.integrate_fraction[addr] - Minter(BAL_PSEUDO_MINTER).minted(addr, self)


@view
@external
def claimed_reward(_addr: address, _token: address) -> uint256:
    """
    @notice Get the number of already-claimed reward tokens for a user
    @param _addr Account to get reward amount for
    @param _token Token to get reward amount for
    @return uint256 Total amount of `_token` already claimed by `_addr`
    """
    return self.claim_data[_addr][_token] % 2**128


@view
@external
def claimable_reward(_user: address, _reward_token: address) -> uint256:
    """
    @notice Get the number of claimable reward tokens for a user
    @param _user Account to get reward amount for
    @param _reward_token Token to get reward amount for
    @return uint256 Claimable reward token amount
    """
    integral: uint256 = self.reward_data[_reward_token].integral
    total_supply: uint256 = self.totalSupply
    if total_supply != 0:
        last_update: uint256 = min(block.timestamp, self.reward_data[_reward_token].period_finish)
        duration: uint256 = last_update - self.reward_data[_reward_token].last_update
        integral += (duration * self.reward_data[_reward_token].rate * 10**18 / total_supply)

    integral_for: uint256 = self.reward_integral_for[_reward_token][_user]
    new_claimable: uint256 = self.balanceOf[_user] * (integral - integral_for) / 10**18

    return shift(self.claim_data[_user][_reward_token], -128) + new_claimable


@external
def set_rewards_receiver(_receiver: address):
    """
    @notice Set the default reward receiver for the caller.
    @dev When set to ZERO_ADDRESS, rewards are sent to the caller
    @param _receiver Receiver address for any rewards claimed via `claim_rewards`
    """
    self.rewards_receiver[msg.sender] = _receiver


@external
@nonreentrant('lock')
def claim_rewards(
    _addr: address = msg.sender,
    _receiver: address = ZERO_ADDRESS,
    _reward_indexes: DynArray[uint256, MAX_REWARDS] = []
):
    """
    @notice Claim available reward tokens for `_addr`
    @param _addr Address to claim for
    @param _receiver Address to transfer rewards to - if set to
                     ZERO_ADDRESS, uses the default reward receiver
                     for the caller
    @param _reward_indexes Array with indexes of the rewards to be checkpointed (all of them by default)
    """
    if _receiver != ZERO_ADDRESS:
        assert _addr == msg.sender, "CANNOT_REDIRECT_CLAIM"  # dev: cannot redirect when claiming for another user
    self._checkpoint_rewards(_addr, self.totalSupply, True, _receiver, _reward_indexes)


@external
def add_reward(_reward_token: address, _distributor: address):
    """
    @notice Set the active reward contract.
    @dev The reward token cannot be BAL, since it is transferred automatically to the pseudo minter during checkpoints.
    """
    assert msg.sender == AUTHORIZER_ADAPTOR, "SENDER_NOT_ALLOWED"  # dev: only owner
    assert _reward_token != BAL, "CANNOT_ADD_BAL_REWARD"

    reward_count: uint256 = self.reward_count
    assert reward_count < MAX_REWARDS, "MAX_REWARDS_REACHED"
    assert self.reward_data[_reward_token].distributor == ZERO_ADDRESS, "REWARD_ALREADY_EXISTS"

    self.reward_data[_reward_token].distributor = _distributor
    self.reward_tokens[reward_count] = _reward_token
    self.reward_count = reward_count + 1


@external
def set_reward_distributor(_reward_token: address, _distributor: address):
    current_distributor: address = self.reward_data[_reward_token].distributor

    assert msg.sender in [current_distributor, AUTHORIZER_ADAPTOR], "SENDER_NOT_ALLOWED"
    assert current_distributor != ZERO_ADDRESS, "REWARD_NOT_ADDED"
    assert _distributor != ZERO_ADDRESS, "INVALID_DISTRIBUTOR"

    self.reward_data[_reward_token].distributor = _distributor


@external
@nonreentrant("lock")
def deposit_reward_token(_reward_token: address, _amount: uint256):
    assert msg.sender == self.reward_data[_reward_token].distributor, "SENDER_NOT_ALLOWED"

    # It is safe to checkpoint all the existing rewards as long as `_claim` is set to false (i.e. no external calls).
    self._checkpoint_rewards(ZERO_ADDRESS, self.totalSupply, False, ZERO_ADDRESS, [])

    response: Bytes[32] = raw_call(
        _reward_token,
        _abi_encode(
            msg.sender,
            self,
            _amount,
            method_id=method_id("transferFrom(address,address,uint256)")
        ),
        max_outsize=32,
    )
    if len(response) != 0:
        assert convert(response, bool), "TRANSFER_FROM_FAILURE"

    period_finish: uint256 = self.reward_data[_reward_token].period_finish
    if block.timestamp >= period_finish:
        self.reward_data[_reward_token].rate = _amount / WEEK
    else:
        remaining: uint256 = period_finish - block.timestamp
        leftover: uint256 = remaining * self.reward_data[_reward_token].rate
        self.reward_data[_reward_token].rate = (_amount + leftover) / WEEK

    self.reward_data[_reward_token].last_update = block.timestamp
    self.reward_data[_reward_token].period_finish = block.timestamp + WEEK


@external
def killGauge():
    """
    @notice Kills the gauge so it always yields a rate of 0 and so cannot mint BAL
    """
    assert msg.sender == AUTHORIZER_ADAPTOR, "SENDER_NOT_ALLOWED"  # dev: only owner

    self.is_killed = True


@external
def unkillGauge():
    """
    @notice Unkills the gauge so it can mint BAL again
    """
    assert msg.sender == AUTHORIZER_ADAPTOR, "SENDER_NOT_ALLOWED"  # dev: only owner

    self.is_killed = False


@view
@external
def decimals() -> uint256:
    """
    @notice Returns the number of decimals the token uses
    """
    return 18


@view
@external
def allowance(owner: address, spender: address) -> uint256:
    """
     @notice Get `spender`'s current allowance from `owner` 
    """
    return self._get_allowance(owner, spender)


@view
@external
def integrate_checkpoint() -> uint256:
    return self.period_timestamp[self.period]


@view
@external
def bal_token() -> address:
    return BAL


@view
@external
def bal_pseudo_minter() -> address:
    return BAL_PSEUDO_MINTER


@view
@external
def voting_escrow_delegation_proxy() -> address:
    return VE_DELEGATION_PROXY


@view
@external
def authorizer_adaptor() -> address:
    """
    @notice Return the authorizer adaptor address.
    """
    return AUTHORIZER_ADAPTOR


@external
def initialize(_lp_token: address, _version: String[128]):
    assert self.lp_token == ZERO_ADDRESS, "ALREADY_INITIALIZED"  # dev: already initialzed

    self.lp_token = _lp_token
    self.version = _version
    self.factory = msg.sender

    symbol: String[26] = ERC20Extended(_lp_token).symbol()
    name: String[64] = concat("Balancer ", symbol, " Gauge Deposit")

    self.name = name
    self.symbol = concat(symbol, "-gauge")

    self.period_timestamp[0] = block.timestamp
    self.DOMAIN_SEPARATOR = keccak256(
        _abi_encode(
            DOMAIN_TYPE_HASH,
            keccak256(name),
            keccak256(self.version),
            chain.id,
            self
        )
    )

Contract ABI

[{"name":"Approval","inputs":[{"name":"_owner","type":"address","indexed":true},{"name":"_spender","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Transfer","inputs":[{"name":"_from","type":"address","indexed":true},{"name":"_to","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Deposit","inputs":[{"name":"_user","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Withdraw","inputs":[{"name":"_user","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"UpdateLiquidityLimit","inputs":[{"name":"_user","type":"address","indexed":true},{"name":"_original_balance","type":"uint256","indexed":false},{"name":"_original_supply","type":"uint256","indexed":false},{"name":"_working_balance","type":"uint256","indexed":false},{"name":"_working_supply","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_voting_escrow_delegation_proxy","type":"address"},{"name":"_bal_pseudo_minter","type":"address"},{"name":"_authorizer_adaptor","type":"address"},{"name":"_version","type":"string"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"deposit","inputs":[{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"deposit","inputs":[{"name":"_value","type":"uint256"},{"name":"_user","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"withdraw","inputs":[{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"withdraw","inputs":[{"name":"_value","type":"uint256"},{"name":"_user","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"transferFrom","inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"approve","inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"permit","inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_deadline","type":"uint256"},{"name":"_v","type":"uint8"},{"name":"_r","type":"bytes32"},{"name":"_s","type":"bytes32"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"transfer","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"increaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_added_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"decreaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_subtracted_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"user_checkpoint","inputs":[{"name":"addr","type":"address"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"claimable_tokens","inputs":[{"name":"addr","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"claimed_reward","inputs":[{"name":"_addr","type":"address"},{"name":"_token","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"claimable_reward","inputs":[{"name":"_user","type":"address"},{"name":"_reward_token","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"nonpayable","type":"function","name":"set_rewards_receiver","inputs":[{"name":"_receiver","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim_rewards","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim_rewards","inputs":[{"name":"_addr","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim_rewards","inputs":[{"name":"_addr","type":"address"},{"name":"_receiver","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim_rewards","inputs":[{"name":"_addr","type":"address"},{"name":"_receiver","type":"address"},{"name":"_reward_indexes","type":"uint256[]"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"add_reward","inputs":[{"name":"_reward_token","type":"address"},{"name":"_distributor","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_reward_distributor","inputs":[{"name":"_reward_token","type":"address"},{"name":"_distributor","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"deposit_reward_token","inputs":[{"name":"_reward_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"killGauge","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"unkillGauge","inputs":[],"outputs":[]},{"stateMutability":"view","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"allowance","inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_checkpoint","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"bal_token","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"bal_pseudo_minter","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"voting_escrow_delegation_proxy","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"authorizer_adaptor","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"nonpayable","type":"function","name":"initialize","inputs":[{"name":"_lp_token","type":"address"},{"name":"_version","type":"string"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"DOMAIN_SEPARATOR","inputs":[],"outputs":[{"name":"","type":"bytes32"}]},{"stateMutability":"view","type":"function","name":"nonces","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"name","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"symbol","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"balanceOf","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"totalSupply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"lp_token","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"version","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"factory","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"working_balances","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"working_supply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"period","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"period_timestamp","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_checkpoint_of","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_fraction","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_inv_supply","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_inv_supply_of","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"reward_count","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"reward_tokens","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"reward_data","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"tuple","components":[{"name":"distributor","type":"address"},{"name":"period_finish","type":"uint256"},{"name":"rate","type":"uint256"},{"name":"last_update","type":"uint256"},{"name":"integral","type":"uint256"}]}]},{"stateMutability":"view","type":"function","name":"rewards_receiver","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"reward_integral_for","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"is_killed","inputs":[],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"view","type":"function","name":"inflation_rate","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]}]

Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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