Contract 0x4d13d387f372dbe5125b7d78e75094ac85b31edc 1

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x3c9947f7674deb6558372d128deaf8bf9ba5206095a70f62c38d12ad79e425bfUser_checkpoint325699022024-02-22 0:35:4021 hrs 21 mins ago0xe9735f7d85a57bfb860c1e2c1c7b4f587ba0f6e7 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.001016487263
0x76450b9fc832145bc000d13d42343ece428e030d85b847a4f68bbcb240a38ad2Deposit325248392024-02-19 6:03:053 days 15 hrs ago0x58eb12c597f652799b138cc3f6659be987f846a4 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.004277088011
0x84955d3edbb22b9e2d3565fddbec447bc82b65db4145bcbaf9d411e4e1635976Deposit325150342024-02-18 15:34:004 days 6 hrs ago0xc98d785eceea2b074fffc24f682c8ad9fa2d9d8d IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000639947726
0x47baeb8b30f62f85bc682aea93004fb8acc0911451eeeef141b223c3254c1531Deposit324953902024-02-17 10:31:405 days 11 hrs ago0x607ae3e1d1301411bbb71a391e2f3f79b93d15af IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000402775505
0xb6b9d8c802373476fc038cafb3a4546a51cca4ed21a1d5d2746010d9383b5cdfDeposit324717402024-02-15 23:41:006 days 22 hrs ago0xe58585b22cc2ac4270a2b92c2d2d8c5db5a3330e IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000344293502
0xd4628152fe9d803818336192d4ef21d7053c936db1bfe77d1af408df2446b017Withdraw324716302024-02-15 23:31:056 days 22 hrs ago0x78e87757861185ec5e8c0ef6bf0c69fa7832df6c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.00039050016
0x2b08f4b9a14b95bf66fa1d4b457135b2233e8a2b1a7235e97cf396de201e823cDeposit324580232024-02-15 3:23:307 days 18 hrs ago0x41a1458fdee14e108ce46ea28077cff9454b3085 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.005536931503
0x83aafa4f6c04d41b1b307bcc05659b3d146caeccddc25e91c4e3ca909274ee6bDeposit324331422024-02-13 14:59:459 days 6 hrs ago0x4f0779d4683416ffa8f7ea9d6947dc3440d0bf3e IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000547233229
0xd79e7e11d1ff78d034fb0e1a6e607315fed0100db3ebe5e7cb9b9ab89b8498f9Deposit324295512024-02-13 9:44:409 days 12 hrs ago0x9a80ec4259baf2d62ba5cdea03049f0cc53244a0 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000614860117
0x9d6a3ce86bbd104b8d32c2675b792a293b0ead2198da17fe1c74468efafaac52Deposit324293952024-02-13 9:31:109 days 12 hrs ago0x9a80ec4259baf2d62ba5cdea03049f0cc53244a0 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.00289919301
0xd66b3f9afe5bf9f5270124586f08222f2452617c5b4cf8196d8d56a79d396ac4Deposit324070212024-02-12 0:49:2510 days 21 hrs ago0xc30682cf6461208f1d002b28f585546321a77526 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.002112137169
0x556647712d6d34d5ddeeccec3324c63b3903bd531dca0a5503677cb71b6f8d5eDeposit323569382024-02-08 23:47:2013 days 22 hrs ago0x78e87757861185ec5e8c0ef6bf0c69fa7832df6c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.0019218513
0x18525232db2cdac1b9fc1544dc4d51f3b066d5036a23928964b44466e33c6520Withdraw323497902024-02-08 13:19:1014 days 8 hrs ago0xac6d12019cc68c04a3cc5c0288b3c504c0c5c8c4 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000311253001
0x56d2aa58b0235eff15e27ea060a089519c31f6a1053f37363ba2750cbddf6870Deposit323409022024-02-08 0:21:2014 days 21 hrs ago0x78e87757861185ec5e8c0ef6bf0c69fa7832df6c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000322828442
0x4c080fa0cee8583efdf3609c6e2735fc72eae42b2f3bdcaf9dd26de2733f113dDeposit323263672024-02-07 2:29:3515 days 19 hrs ago0x28c974c18c6553b445c4b77f35d83f3499acf58f IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.001054156
0xab2479f9bc351f19f338c21c942190aec909ace1972995baca15c6729b48d335Deposit323081422024-02-05 23:29:0016 days 22 hrs ago0x78e87757861185ec5e8c0ef6bf0c69fa7832df6c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.001412536457
0xe7e076c3700c2701f41985f1c6ae4a02b8e8e5e72ae782b0a4cf623868d3de48Withdraw323037462024-02-05 16:58:4517 days 4 hrs ago0x142c0056feb860a4c7597e1b110e5fa724a88c7c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.0008715084
0xacb0b4c2c86a4a69149c4824eb7429213bb4d9d84a25dff6eff34d279bf2709bDeposit322857122024-02-04 14:19:3518 days 7 hrs ago0x8ae8b2d61723a072738be9239c9cd6bc9e02af49 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000447656922
0x4856b772b3fe1d2a6b668a3eeb6b78b22b67f84da98bd3c3d3c869939562898fDeposit322786712024-02-04 3:59:0018 days 17 hrs ago0xc61336b9f40ea1e03f0200cd0f636256ac806aed IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000957538694
0xeef43e41ca16a4a143f404e1c56e5c0c9cbf235c6bdaebffd5ecd2484f38f695Deposit322709762024-02-03 16:34:2019 days 5 hrs ago0x67dd646ef1866f4314951c9704535cbbc9db7c92 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.0015241303
0x7c74cb9b23931e9b9b8692019d7c74111c0c866f9ae9c2818c4b296607b6cbeeDeposit322558082024-02-02 18:18:2520 days 3 hrs ago0x142c0056feb860a4c7597e1b110e5fa724a88c7c IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.0006852326
0x1d99ca634954a176a09503566a332df31e387ee76cd3542ba8a930af8cd21d1bUser_checkpoint322274632024-02-01 0:35:4021 days 21 hrs ago0xe9735f7d85a57bfb860c1e2c1c7b4f587ba0f6e7 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000705764823
0xf687b235a6ee93d803190da6435174a0ea8f66e777e28562aae41668d4ca15bfDeposit321875382024-01-29 14:17:5024 days 7 hrs ago0xc98d785eceea2b074fffc24f682c8ad9fa2d9d8d IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.00034402664
0x69095bcb16a15337b62de6c5d432b77d6b7a60bbee4ef5d807da220f48770a10Withdraw321863722024-01-29 12:35:1524 days 9 hrs ago0xc98d785eceea2b074fffc24f682c8ad9fa2d9d8d IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000292577822
0x5a3e8ef47aef5ad5c484bbc926dde1c4c9bf3cf147c15487cb7b2ecf8ca9d0b6User_checkpoint321126512024-01-25 0:35:4028 days 21 hrs ago0xe9735f7d85a57bfb860c1e2c1c7b4f587ba0f6e7 IN  0x4d13d387f372dbe5125b7d78e75094ac85b31edc0 xDAI0.000328705651
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0x4e419f8f0663bc508fb1797f7be2d311ed604480981a3db09efccea75f6da0e1302743082023-10-03 9:12:35142 days 12 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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