Contract Source Code (Vyper language format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Submit Audit
• Compare

# @version 0.2.16
"""
@title Simple Vesting Escrow
@author Curve Finance, Yearn Finance
@license MIT
@notice Vests ERC20 tokens for a single address
@dev Intended to be deployed many times via `VotingEscrowFactory`
"""

from vyper.interfaces import ERC20

event Fund:
    recipient: indexed(address)
    amount: uint256

event Claim:
    recipient: indexed(address)
    claimed: uint256

event RugPull:
    recipient: address
    rugged: uint256

event CommitOwnership:
    admin: address

event ApplyOwnership:
    admin: address

recipient: public(address)
token: public(ERC20)
start_time: public(uint256)
end_time: public(uint256)
cliff_length: public(uint256)
total_locked: public(uint256)
total_claimed: public(uint256)
disabled_at: public(uint256)
initialized: public(bool)

admin: public(address)
future_admin: public(address)

@external
def __init__():
    # ensure that the original contract cannot be initialized
    self.initialized = True


@external
@nonreentrant('lock')
def initialize(
    admin: address,
    token: address,
    recipient: address,
    amount: uint256,
    start_time: uint256,
    end_time: uint256,
    cliff_length: uint256,
) -> bool:
    """
    @notice Initialize the contract.
    @dev This function is seperate from `__init__` because of the factory pattern
         used in `VestingEscrowFactory.deploy_vesting_contract`. It may be called
         once per deployment.
    @param admin Admin address
    @param token Address of the ERC20 token being distributed
    @param recipient Address to vest tokens for
    @param amount Amount of tokens being vested for `recipient`
    @param start_time Epoch time at which token distribution starts
    @param end_time Time until everything should be vested
    @param cliff_length Duration after which the first portion vests
    """
    assert not self.initialized  # dev: can only initialize once
    self.initialized = True

    self.token = ERC20(token)
    self.admin = admin
    self.start_time = start_time
    self.end_time = end_time
    self.cliff_length = cliff_length

    assert self.token.transferFrom(msg.sender, self, amount)  # dev: could not fund escrow

    self.recipient = recipient
    self.disabled_at = end_time  # Set to maximum time
    self.total_locked = amount
    log Fund(recipient, amount)

    return True


@internal
@view
def _total_vested_at(time: uint256 = block.timestamp) -> uint256:
    start: uint256 = self.start_time
    end: uint256 = self.end_time
    locked: uint256 = self.total_locked
    if time < start + self.cliff_length:
        return 0
    return min(locked * (time - start) / (end - start), locked)


@internal
@view
def _unclaimed(time: uint256 = block.timestamp) -> uint256:
    return self._total_vested_at(time) - self.total_claimed


@external
@view
def unclaimed() -> uint256:
    """
    @notice Get the number of unclaimed, vested tokens for recipient
    """
    # NOTE: if `rug_pull` is activated, limit by the activation timestamp
    return self._unclaimed(min(block.timestamp, self.disabled_at))


@internal
@view
def _locked(time: uint256 = block.timestamp) -> uint256:
    return self.total_locked - self._total_vested_at(time)


@external
@view
def locked() -> uint256:
    """
    @notice Get the number of locked tokens for recipient
    """
    # NOTE: if `rug_pull` is activated, limit by the activation timestamp
    return self._locked(min(block.timestamp, self.disabled_at))


@external
def claim(beneficiary: address = msg.sender, amount: uint256 = MAX_UINT256):
    """
    @notice Claim tokens which have vested
    @param beneficiary Address to transfer claimed tokens to
    @param amount Amount of tokens to claim
    """
    assert msg.sender == self.recipient  # dev: not recipient

    claim_period_end: uint256 = min(block.timestamp, self.disabled_at)
    claimable: uint256 = min(self._unclaimed(claim_period_end), amount)
    self.total_claimed += claimable

    assert self.token.transfer(beneficiary, claimable)
    log Claim(beneficiary, claimable)


@external
def rug_pull():
    """
    @notice Disable further flow of tokens and clawback the unvested part to admin
    """
    assert msg.sender == self.admin  # dev: admin only
    # NOTE: Rugging more than once is futile

    self.disabled_at = block.timestamp
    ruggable: uint256 = self._locked()

    assert self.token.transfer(self.admin, ruggable)
    log RugPull(self.recipient, ruggable)


@external
def commit_transfer_ownership(addr: address):
    """
    @notice Transfer ownership of the contract to `addr`
    @param addr Address to have ownership transferred to
    """
    assert msg.sender == self.admin  # dev: admin only
    self.future_admin = addr
    log CommitOwnership(addr)


@external
def apply_transfer_ownership():
    """
    @notice Apply pending ownership transfer
    """
    assert msg.sender == self.future_admin  # dev: future admin only
    self.admin = msg.sender
    self.future_admin = ZERO_ADDRESS
    log ApplyOwnership(msg.sender)


@external
def renounce_ownership():
    """
    @notice Renounce admin control of the escrow
    """
    assert msg.sender == self.admin  # dev: admin only
    self.future_admin = ZERO_ADDRESS
    self.admin = ZERO_ADDRESS
    log ApplyOwnership(ZERO_ADDRESS)

• No Contract Security Audit Submitted- Submit Audit Here

[{"name":"Fund","inputs":[{"name":"recipient","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Claim","inputs":[{"name":"recipient","type":"address","indexed":true},{"name":"claimed","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"RugPull","inputs":[{"name":"recipient","type":"address","indexed":false},{"name":"rugged","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"CommitOwnership","inputs":[{"name":"admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"name":"ApplyOwnership","inputs":[{"name":"admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"initialize","inputs":[{"name":"admin","type":"address"},{"name":"token","type":"address"},{"name":"recipient","type":"address"},{"name":"amount","type":"uint256"},{"name":"start_time","type":"uint256"},{"name":"end_time","type":"uint256"},{"name":"cliff_length","type":"uint256"}],"outputs":[{"name":"","type":"bool"}],"gas":402331},{"stateMutability":"view","type":"function","name":"unclaimed","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":26060},{"stateMutability":"view","type":"function","name":"locked","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":26120},{"stateMutability":"nonpayable","type":"function","name":"claim","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim","inputs":[{"name":"beneficiary","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claim","inputs":[{"name":"beneficiary","type":"address"},{"name":"amount","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"rug_pull","inputs":[],"outputs":[],"gas":72184},{"stateMutability":"nonpayable","type":"function","name":"commit_transfer_ownership","inputs":[{"name":"addr","type":"address"}],"outputs":[],"gas":39595},{"stateMutability":"nonpayable","type":"function","name":"apply_transfer_ownership","inputs":[],"outputs":[],"gas":59523},{"stateMutability":"nonpayable","type":"function","name":"renounce_ownership","inputs":[],"outputs":[],"gas":44555},{"stateMutability":"view","type":"function","name":"recipient","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2628},{"stateMutability":"view","type":"function","name":"token","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2658},{"stateMutability":"view","type":"function","name":"start_time","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2688},{"stateMutability":"view","type":"function","name":"end_time","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2718},{"stateMutability":"view","type":"function","name":"cliff_length","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2748},{"stateMutability":"view","type":"function","name":"total_locked","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2778},{"stateMutability":"view","type":"function","name":"total_claimed","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2808},{"stateMutability":"view","type":"function","name":"disabled_at","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2838},{"stateMutability":"view","type":"function","name":"initialized","inputs":[],"outputs":[{"name":"","type":"bool"}],"gas":2868},{"stateMutability":"view","type":"function","name":"admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2898},{"stateMutability":"view","type":"function","name":"future_admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2928}]

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

0x600436101561000d5761067d565b600035601c526000513461085457632b4656c881141561011d5760005461085457600160005560043560a01c6108545760243560a01c6108545760443560a01c61085457600954610854576001600955602435600255600435600a5560843560035560a43560045560c435600555602061020060646323b872dd61014052336101605230610180526064356101a05261015c60006002545af11561085457601f3d11156108545760005061020051156108545760443560015560a4356008556064356006556044357fda8220a878ff7a89474ccffdaa31ea1ed1ffbb0207d5051afccc4fbaf81f9bcd61014080808060643581525050602090509050610140a26001600052600060005560206000f35b63669416b881141561017357426008548082111561013b578061013d565b815b90509050610140526101405161014051610160526101605160065801610784565b6101c052610140526101c05160005260206000f35b63cf3090128114156101c95742600854808211156101915780610193565b815b905090506101405261014051610140516101605261016051600658016107f9565b6101c052610140526101c05160005260206000f35b634e71d92d8114156102045733610140527fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff61016052610282565b631e83409a81141561024f577fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff6101605260043560a01c610854576020600461014037600050610282565b63aad3ec9681141561027d5760043560a01c6108545760206004610140376020602461016037600050610282565b61039f565b60015433141561085457426008548082111561029e57806102a0565b815b90509050610180526101405161016051610180516101a051610180516101c0526101c05160065801610784565b610220526101a0526101805261016052610140526102205161016051808211156102f757806102f9565b815b905090506101a052600780546101a051818183011061085457808201905090508155506020610260604463a9059cbb6101c052610140516101e0526101a051610200526101dc60006002545af11561085457601f3d111561085457600050610260511561085457610140517f47cee97cb7acd717b3c0aa1435d004cd5b3c8c57d70dbceb4e4458bbd60e39d46101c08080806101a051815250506020905090506101c0a2005b63713533b381141561046357600a54331415610854574260085561014051600658016107e3565b610160526101405261016051610140526020610200604463a9059cbb61016052600a5461018052610140516101a05261017c60006002545af11561085457601f3d1115610854576000506102005115610854577f26c39210ac9cda246a6cc6e33da67c1971d5f14bbc32e2b66c3e14ab813549d76101608080806001548152505060208101905080806101405181525050604090509050610160a1005b636b441a408114156104c35760043560a01c61085457600a5433141561085457600435600b557f2f56810a6bf40af059b96d3aea4db54081f378029a518390491093a7b67032e961014080808060043581525050602090509050610140a1005b636a1c05ae81141561051a57600b543314156108545733600a556000600b557febee2d5739011062cb4f14113f3b36bf0ffe3da5c0568f64189d1012a11891056101408080803381525050602090509050610140a1005b63b15e13ee81141561057357600a54331415610854576000600b556000600a557febee2d5739011062cb4f14113f3b36bf0ffe3da5c0568f64189d1012a1189105610140808080600081525050602090509050610140a1005b6366d003ac81141561058b5760015460005260206000f35b63fc0c546a8114156105a35760025460005260206000f35b63834ee4178114156105bb5760035460005260206000f35b63162433568114156105d35760045460005260206000f35b6394abf7608114156105eb5760055460005260206000f35b633c48a6208114156106035760065460005260206000f35b636af904c681141561061b5760075460005260206000f35b63ac1a2f698114156106335760085460005260206000f35b63158ef93e81141561064b5760095460005260206000f35b63f851a44081141561066357600a5460005260206000f35b6317f7182a81141561067b57600b5460005260206000f35b505b60006000fd610695575b6101605242610140526106ae565b6000156106ad575b61016052610140526000506106ae565b5b600354610180526004546101a0526006546101c05261018051600554818183011061085457808201905090506101405110156106f257600060005260005161016051565b6101c0516101405161018051808210610854578082039050905080820282158284830414171561085457809050905090506101a051610180518082106108545780820390509050808015610854578204905090506101c05180821115610758578061075a565b815b90509050600052600051610160515661077c575b610160524261014052610795565b600015610794575b6101605261014052600050610795565b5b61014051610160516101405161018052610180516006580161069d565b6101e05261016052610140526101e051600754808210610854578082039050905060005260005161016051566107f1575b61016052426101405261080a565b600015610809575b610160526101405260005061080a565b5b60065461014051610160516101405161018052610180516006580161069d565b6101e05261016052610140526101e051808210610854578082039050905060005260005161016051565b600080fd