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Contract

0x8882eB84d0c4894753C0450f2D514E39883c0C82

Overview

frxETH Balance | FXTL Balance

0 frxETH | 266,611 FXTL

frxETH Value

$0.00

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From
To
Claim_rewards161740792025-02-10 3:41:0919 hrs ago1739158869IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.00100025
Claim_rewards160635042025-02-07 14:15:193 days ago1738937719IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards160441352025-02-07 3:29:413 days ago1738898981IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.00100025
Deposit159258732025-02-04 9:47:376 days ago1738662457IN
0x8882eB84...9883c0C82
0 frxETH0.000000280.00110025
Deposit158933262025-02-03 15:42:437 days ago1738597363IN
0x8882eB84...9883c0C82
0 frxETH0.000000230.00100025
Claim_rewards158843162025-02-03 10:42:237 days ago1738579343IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards158772832025-02-03 6:47:577 days ago1738565277IN
0x8882eB84...9883c0C82
0 frxETH0.00000010.00110025
Claim_rewards158481402025-02-02 14:36:318 days ago1738506991IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.00100025
Claim_rewards158135222025-02-01 19:22:359 days ago1738437755IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Withdraw158134312025-02-01 19:19:339 days ago1738437573IN
0x8882eB84...9883c0C82
0 frxETH0.000000280.00110025
Claim_rewards157177622025-01-30 14:10:3511 days ago1738246235IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards156968682025-01-30 2:34:0711 days ago1738204447IN
0x8882eB84...9883c0C82
0 frxETH0.00000010.00110025
Claim_rewards156740722025-01-29 13:54:1512 days ago1738158855IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Deposit156617112025-01-29 7:02:1312 days ago1738134133IN
0x8882eB84...9883c0C82
0 frxETH0.000000280.00110025
Claim_rewards155228212025-01-26 1:52:3315 days ago1737856353IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.0012003
Claim_rewards155186922025-01-25 23:34:5515 days ago1737848095IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards154513952025-01-24 10:11:4117 days ago1737713501IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards154354082025-01-24 1:18:4717 days ago1737681527IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.00100025
Claim_rewards154061462025-01-23 9:03:2318 days ago1737623003IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Deposit153462012025-01-21 23:45:1319 days ago1737503113IN
0x8882eB84...9883c0C82
0 frxETH0.000000220.00100025
Claim_rewards153454182025-01-21 23:19:0720 days ago1737501547IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards153395202025-01-21 20:02:3120 days ago1737489751IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Claim_rewards152865262025-01-20 14:36:0321 days ago1737383763IN
0x8882eB84...9883c0C82
0 frxETH0.000000090.00100025
Claim_rewards152780252025-01-20 9:52:4121 days ago1737366761IN
0x8882eB84...9883c0C82
0 frxETH0.000000080.00100025
Deposit152682472025-01-20 4:26:4521 days ago1737347205IN
0x8882eB84...9883c0C82
0 frxETH0.000000230.00100025
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Latest 1 internal transaction

Parent Transaction Hash Block From To
22870712024-03-25 16:40:53322 days ago1711384853  Contract Creation0 frxETH

Latest 25 Deposits

L2 Txn Hash L1 Deposit Txn Value Token
0xdfa948150e1c76e19559e5f280ed6ec5a3bdfedd7368322935f36bfa8796ce1d2025-02-06 0:05:374 days ago17388003371,668.702101762416007901 Curve DAO To... (CRV)
0x322b6a53287dde8cfdd1ea2b2e13990daa847ea64a95cb35b6894332227334142025-01-30 0:11:2111 days ago17381958811,667.453527676437270768 Curve DAO To... (CRV)
0x3099629b6f1fce1da818ca18bfe9654b6058cf933f91052381c9407a328f6b722025-01-23 0:06:0518 days ago17375907651,660.741038511313147027 Curve DAO To... (CRV)
0xaa7f015f80a6046d952667f1fab278dc3391e501ab06cadbebcc2785be5cc0802025-01-16 0:08:2325 days ago17369861031,658.553354507959352224 Curve DAO To... (CRV)
0xa7ddf2ba3ec10dd51c47ce643e98ab46a529553eabf97b3cc329124c72c2cb622025-01-09 0:05:1732 days ago17363811171,377.284179987071996863 Curve DAO To... (CRV)
0x4f4c320acce06f9ac3fd3dd02bc63f224f63ec6ccfe7d9115010503cd3004b432025-01-02 0:09:1739 days ago17357765571,378.030579156822392472 Curve DAO To... (CRV)
0x0855d19f20906fbe18b6fb9f052290d881c25449d91739413aeefcf801df27c52024-12-26 0:04:3946 days ago17351714791,237.659518462420129761 Curve DAO To... (CRV)
0xe5f7129a411f8840e98e56c10aad0f5774fb8d34b03d679e52ffeaa87d789a822024-12-19 0:09:3953 days ago17345669791,237.963149587557936796 Curve DAO To... (CRV)
0xef75b357798b84bb65576e983d1f8e7f9ae3f0ae2ed5d0e3c439f4d2dbee2a572024-12-12 0:07:3160 days ago17339620514,797.362251870021921986 Curve DAO To... (CRV)
0x1a2bc08242d3b07528d28535877640f7733cb587a7b2da151b7ca0157c9cd0992024-12-05 0:12:1567 days ago17333575354,801.448384308280003825 Curve DAO To... (CRV)
0xe77dc52ad8b9eb9681325ee93b6db44d004f15e5480b18b0c4eed1b248fd78bc2024-11-28 0:19:2574 days ago17327531658,218.020593837286359878 Curve DAO To... (CRV)
0xd54a9026dba031517704081112ef90df88629b49abfa7669772703a68b3bff732024-11-21 0:05:5181 days ago17321475518,236.155951942198478667 Curve DAO To... (CRV)
0xf0c6e951c289c11451cf03070276907c1a76124fc446286f45472807d8d0d8ec2024-11-14 0:23:5988 days ago17315438398,070.30101982999907643 Curve DAO To... (CRV)
0x9a0ec90baa9f49c30580cae36cfead94bf34757a948c09ebcb4e2e138b32737a2024-11-07 0:23:3595 days ago17309390158,072.344880593911820656 Curve DAO To... (CRV)
0xfee350b0389c47e223ad33be1cc9e5b32c8a9c25543e7d2483990b3cd1e077332024-10-31 0:06:17102 days ago17303331776,148.383903282963163673 Curve DAO To... (CRV)
0xc62d47ebebaff045e86879e2c83dabfef8444dfa46d0228e9c1cff78dc73c1772024-10-24 0:18:41109 days ago17297291216,146.130386986606350335 Curve DAO To... (CRV)
0x96774f868942d741c0a4200f8ef89375db8959ff2c250892cacee7734ffe169a2024-10-17 0:14:33116 days ago172912407311,470.180712955198539903 Curve DAO To... (CRV)
0x970c2acb7ef4bd803faaf498701074dc1ea300ce001ddc9bc69dc82a2d671eaa2024-10-10 0:11:55123 days ago172851911511,467.208851761106595734 Curve DAO To... (CRV)
0xc9b571e0ceb75ab3be53dcc7452e822b545b2f2e338308d02ff8de2689a3448c2024-10-03 0:27:17130 days ago17279152376,244.705319713582365217 Curve DAO To... (CRV)
0x9c7ca2d3c319af4e2cdc80e57d466c13bceac2f332fa05cc99cf1208f842c66b2024-09-26 0:08:55137 days ago17273093356,236.431911561724382135 Curve DAO To... (CRV)
0x990ca1cc10ac8939ad00f321b1e19b3a99942a9f4c3a1b7c305392eeb179d68b2024-09-19 0:09:15144 days ago17267045558,436.018764809253123808 Curve DAO To... (CRV)
0xcbf484fa27a188a895d284b0ba22a735a68a709db945322f41954f75478c2a1e2024-09-12 0:08:27151 days ago17260997078,438.78062220104173471 Curve DAO To... (CRV)
0x9d0f0fff6db954136a609a81880c9d730535b73c0e0ff172752073e55a4f55862024-09-05 0:06:23158 days ago17254947832,458.386924568970455364 Curve DAO To... (CRV)
0x8633fcac6d506dd49b04503963e874ba9f6548a498e39ad885c4f29e352c30652024-08-29 0:04:35165 days ago17248898752,458.492942512370950567 Curve DAO To... (CRV)
0x333241ccfca5713f1bead16768dba5218d484dd87666efaa9f264705575e261f2024-08-22 1:16:15172 days ago17242893751,480.424938806841438221 Curve DAO To... (CRV)
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Minimal Proxy Contract for 0x10ac65a9f710c3d607d213784e5b8632c77d5d4f

Contract Name:
Child Liquidity Gauge

Compiler Version
vyper:0.3.1

Optimization Enabled:
N/A

Other Settings:
default evmVersion, None license

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 Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.