Contract 0xc106c836771b0b4f4a0612bd68163ca93be1d340

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x8ff9c6a2d262e62e681e6b5b48597ab2a6607dc6694f3d89733044df83c05b20Deposit16321552022-08-11 20:40:4845 mins ago0x3e92d661bd5063f7df955d68e123b96d069069e9 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117178
0x556623b57f3e9f44545998a5587061cdd8741327f98e449d82edf3b62d9a0fcdClaim_rewards16320962022-08-11 20:28:4257 mins ago0x3e92d661bd5063f7df955d68e123b96d069069e9 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0083159
0xf0a995b75ad4b93114cb2ab0f40a2c06aca09b23de44448dffeabab6683da67eDeposit16320272022-08-11 20:14:061 hr 12 mins ago0xc8da26be4ba7d11f4960f275d5effe93a6a6d7be IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0185902
0x97061e34826dc30caa2a0158e706a86b23fb3b56500d0afa1fb8cb5fe1008216Deposit16320222022-08-11 20:13:061 hr 13 mins ago0x804c4c527f3b278a1b328ebe239359e1c1008398 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117197
0x55ee99c8e8b41d1371f64ee6ed1fc07cd8751d18439255cb0bf063956ecb0c02Deposit16319772022-08-11 20:03:241 hr 22 mins ago0x804c4c527f3b278a1b328ebe239359e1c1008398 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117197
0x7a905da3c49463edd0816adf90258334728f93ea94af2280452a895ca5f09a20Claim_rewards16319512022-08-11 19:57:541 hr 28 mins ago0x804c4c527f3b278a1b328ebe239359e1c1008398 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0066518
0x43bbb383b31b0b9ccec1104199a13e56d715f47e2c33e5f9fd298a85f86dec9cDeposit16318532022-08-11 19:37:241 hr 48 mins ago0xf9b7f3cd29f0020dfd5ab7af828a8967aacf6c76 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍018589
0xc0b0c863d18dbea062aee71eed72393fa5a7496613c1dd9251700d5cacd2d3dbDeposit16316432022-08-11 18:53:482 hrs 32 mins ago0x1eadd8445211e0318ec10623e3ae2a2918e17ee9 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍018589
0x5d8490d9a6cd1d5201fb224f6ee0be27c599bcc42779ae6ee2ce1fd631e9900dDeposit16306112022-08-11 15:20:186 hrs 6 mins ago0xe30dd6bac9e195f5891d7618461a195c6b2ff68a IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍018589
0xd5a2e27c0d3f28b79becaff27e76155ce0f153bcbcf59890b9a4e6b606e7ef46Deposit16304432022-08-11 14:45:546 hrs 40 mins ago0xdeccf3122d665f0e912bac602f0e28c0ae0ea8d2 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117197
0xadde74e926500f23637dc7daed0dc0f7e460ef097fcdab7606c3d3318bf7de91Deposit16303662022-08-11 14:30:246 hrs 55 mins ago0x439511dd6fc762fe28bd015d68157ea462ceb88d IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117178
0x1bdb3913d94f3b36e460406c838ee5c2ad506a45eeb20b680a587c84fc94f57cDeposit16303642022-08-11 14:30:006 hrs 56 mins ago0x1a08b4d6497fa6d5970bd8f6c72bc5fbc8dd500e IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍01877489
0x15e68863595809e31335f797667c533f6cc15bff64d040bd9d41eabf28f702d9Claim_rewards16303162022-08-11 14:20:067 hrs 6 mins ago0x952bf71fb03cdacb03bcf19d169acae0be18ebe1 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0066528
0xcef89765d387ee3519d7af7301b118e02d7f4b0c4d0ebc942ecd3af365c07df9Claim_rewards16300412022-08-11 13:23:188 hrs 3 mins ago0x439511dd6fc762fe28bd015d68157ea462ceb88d IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0083159
0x7883d62ec88aac6d02677f04d1525b092a33f6fb49df2080a51766a352006310Deposit16299762022-08-11 13:10:068 hrs 16 mins ago0xdeccf3122d665f0e912bac602f0e28c0ae0ea8d2 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117188
0x40ef40b211c38a6a03b08e458e48b79242048c2051469b403a61c25ed676acb7Deposit16299372022-08-11 13:01:488 hrs 24 mins ago0x13a2c0ee5c5ac96afcd0026740c0788367a8afcc IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117188
0xa11a4bf164a9005a88ce3d314a6d149640b69cc3b639ecb31482568c5268c7f3Claim_rewards16299312022-08-11 13:00:188 hrs 26 mins ago0x13a2c0ee5c5ac96afcd0026740c0788367a8afcc IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0103059
0x02e7f3873b00971e58bae2ffff2c8bfea24b8911f473ff7dcaf6048ba57bced9Claim_rewards16296372022-08-11 11:59:069 hrs 27 mins ago0xa0dce7aaeacafc6f2860b81dc692d5d0a68e3c90 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0066528
0x4c291c3f241862c0a22846df8d69afae6b092ce8028e90b72ada60bd1c8c1e74Claim_rewards16296242022-08-11 11:56:309 hrs 29 mins ago0x28b70a43e069e35e31f3f01fe0f9664858488336 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0066528
0x3562e22cbb34161520c6ecbb01a54b4a1ca8161f53afb543c20f52708ebc0d59Withdraw16295492022-08-11 11:41:129 hrs 45 mins ago0x1effb1361921130b9d5259da5fabc91c3efb6234 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0144169
0xa431e4cbd7494d80071baa868a4f4fecd4a7eb10b52ce78a0af3ddf2013fbd76Claim_rewards16294962022-08-11 11:30:069 hrs 56 mins ago0x6d5eebdfed88a9d24e49c4ed576390cc9933ca21 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0103059
0xe5befaf5a622f74d357c0720f1e4f93bf69a0fe0dcbf7dd39fa5757e3aae8739Deposit16291772022-08-11 10:24:1211 hrs 2 mins ago0xa213a08a306b76fd0ba3a3e3abc979d5f3e6a5ec IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍018773678
0xedd967690df0c97baa52f0edd56c0e02eb5ff74b1954880c7ef55b86283cf23fDeposit16290092022-08-11 9:49:0611 hrs 37 mins ago0x11cc69ac73a83f4b3cb1420f2faf7b09491f1d8e IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0117178
0x3816825322f21ae52f0926acd87ac4c18020e433c594dd64b064d10ad71e652bClaim_rewards16289922022-08-11 9:45:3611 hrs 40 mins ago0x11cc69ac73a83f4b3cb1420f2faf7b09491f1d8e IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0083159
0xc42a4e38f5f0604ed638fadba7bd001875620a715c61570a16c2b96a7c538240Claim_rewards16288652022-08-11 9:19:0012 hrs 7 mins ago0x952bf71fb03cdacb03bcf19d169acae0be18ebe1 IN  0xc106c836771b0b4f4a0612bd68163ca93be1d3400 GLMR0.‍0066528
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0x430cefd0ffdfa1cabe1a0f907b6349d439080b4b760c8b8c5cd10df2e287af3e15819252022-08-04 14:58:307 days 6 hrs ago 0xabc000d88f23bb45525e447528dbf656a9d55bf5  Contract Creation0 GLMR
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Minimal Proxy Contract for 0x9336da074c4f585a8b59a8c2b77a32b630cde5a1

Contract Name:
Vyper_contract

Compiler Version
vyper:0.3.1

Optimization Enabled:
N/A

Other Settings:
, None license
Decompile ByteCode

Contract Source Code (Vyper language format)

# @version 0.3.1
"""
@title Child Liquidity Gauge
@license MIT
@author Curve Finance
"""
from vyper.interfaces import ERC20

implements: ERC20


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

interface Factory:
    def owner() -> address: view
    def voting_escrow() -> address: view

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

interface ERC1271:
    def isValidSignature(_hash: bytes32, _signature: Bytes[65]) -> bytes32: 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
VERSION: constant(String[8]) = "v0.1.0"


CRV: immutable(address)
FACTORY: immutable(address)


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

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

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

lp_token: public(address)
manager: public(address)

voting_escrow: 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__(_crv_token: address, _factory: address):
    self.lp_token = 0x000000000000000000000000000000000000dEaD

    CRV = _crv_token
    FACTORY = _factory


@internal
def _checkpoint(_user: address):
    """
    @notice Checkpoint a user calculating their CRV 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 block.timestamp > period_time:

        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 CRV balance and increase weekly inflation rate by delta for the rest of the week
    crv_balance: uint256 = ERC20(CRV).balanceOf(self)
    if crv_balance != 0:
        current_week: uint256 = block.timestamp / WEEK
        self.inflation_rate[current_week] += crv_balance / ((current_week + 1) * WEEK - block.timestamp)
        ERC20(CRV).transfer(FACTORY, crv_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 CRV production.
    @dev https://resources.curve.fi/guides/boosting-your-crv-rewards#formula
    @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 = self.voting_escrow
    if ve != ZERO_ADDRESS:
        ve_ts: uint256 = ERC20(ve).totalSupply()
        if ve_ts != 0:
            working_balance += _total_supply * ERC20(ve).balanceOf(_user) / 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)


@internal
def _checkpoint_rewards(_user: address, _total_supply: uint256, _claim: bool, _receiver: address):
    """
    @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
    for i in range(MAX_REWARDS):
        if i == reward_count:
            break
        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)
                    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)
        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, _claim_rewards: bool = False):
    """
    @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:
        self._checkpoint_rewards(_user, total_supply, _claim_rewards, 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, _claim_rewards: bool = False):
    """
    @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:
        self._checkpoint_rewards(_user, total_supply, _claim_rewards, 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)


@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.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
    assert block.timestamp <= _deadline

    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
    else:
        assert ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256)) == _owner

    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.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.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
    """
    assert msg.sender in [addr, FACTORY]  # dev: unauthorized
    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(FACTORY).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):
    """
    @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
    """
    if _receiver != ZERO_ADDRESS:
        assert _addr == msg.sender  # dev: cannot redirect when claiming for another user
    self._checkpoint_rewards(_addr, self.totalSupply, True, _receiver)


@external
def add_reward(_reward_token: address, _distributor: address):
    """
    @notice Set the active reward contract
    """
    assert msg.sender == self.manager or msg.sender == Factory(FACTORY).owner()

    reward_count: uint256 = self.reward_count
    assert reward_count < MAX_REWARDS
    assert self.reward_data[_reward_token].distributor == ZERO_ADDRESS

    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 == current_distributor or msg.sender == self.manager or msg.sender == Factory(FACTORY).owner()
    assert current_distributor != ZERO_ADDRESS
    assert _distributor != ZERO_ADDRESS

    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

    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)

    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 set_manager(_manager: address):
    assert msg.sender == Factory(FACTORY).owner()

    self.manager = _manager


@external
def update_voting_escrow():
    """
    @notice Update the voting escrow contract in storage
    """
    self.voting_escrow = Factory(FACTORY).voting_escrow()


@external
def set_killed(_is_killed: bool):
    """
    @notice Set the kill status of the gauge
    @param _is_killed Kill status to put the gauge into
    """
    assert msg.sender == Factory(FACTORY).owner()

    self.is_killed = _is_killed


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


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


@view
@external
def version() -> String[8]:
    return VERSION


@view
@external
def factory() -> address:
    return FACTORY


@external
def initialize(_lp_token: address, _manager: address):
    assert self.lp_token == ZERO_ADDRESS  # dev: already initialzed

    self.lp_token = _lp_token
    self.manager = _manager

    self.voting_escrow = Factory(msg.sender).voting_escrow()

    symbol: String[26] = ERC20Extended(_lp_token).symbol()
    name: String[64] = concat("Curve.fi ", 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(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":"_crv_token","type":"address"},{"name":"_factory","type":"address"}],"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":"deposit","inputs":[{"name":"_value","type":"uint256"},{"name":"_user","type":"address"},{"name":"_claim_rewards","type":"bool"}],"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":"withdraw","inputs":[{"name":"_value","type":"uint256"},{"name":"_user","type":"address"},{"name":"_claim_rewards","type":"bool"}],"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":"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":"set_manager","inputs":[{"name":"_manager","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"update_voting_escrow","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_killed","inputs":[{"name":"_is_killed","type":"bool"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"integrate_checkpoint","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"version","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"factory","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"nonpayable","type":"function","name":"initialize","inputs":[{"name":"_lp_token","type":"address"},{"name":"_manager","type":"address"}],"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":"allowance","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"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":"manager","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"voting_escrow","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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