Aragon Fundraising App

Architecture

Contracts

BondingCurve

Interface

function buy(uint256 _value) external payable;
function sell(uint256 _amount) external;

Roles

	Description	Grantee
BUY_ROLE	Buy bonds against ETH or ERC-20 collateral	ANY_ADDRESS
SELL_ROLE	Redeem bonds for ETH or ERC-20 collateral	ANY_ADDRESS

CollateralPool

Interface

function deposit(address _token, uint256 _value) external payable;
function transfer(address _token, uint256 _value) external;
function execute(address _target, bytes _data) external;

Roles

	Description	Grantee
DEPOSIT_ROLE	Deposit ETH or ERC-20 into the CollateralPool	BondingCurve contract[s]
TRANSFER_ROLE	Transfer ETH or ERC-20 out of the CollateralPool	BondingCurve contract[s] and Tap contract
SAFE_EXECUTE_ROLE	Execute balance neutral transactions on external contract	Voting [BOND] contract

Notes

Depending on the token address the contract must also hook into the BondingCurve contract to let it [optionally] update its vBalance state variable [thus reflecting the requested changes in the price curve]

Tap

Interface

function updateTap(uint256 _tap) external;
function updateVault(address _vault) external;
function withdraw() external;

Roles

	Description	Grantee
UPDATE_TAP_ROLE	Update tap rate	Voting [BOND] contract
WITHDRAW_ROLE	Initialize ETH or ERC-20 transfer on the CollateralPool to the discretionary Vault	ANY_ADDRESS

Notes

Implementing the tap system as an external contract owning TRANSFER_ROLE over the CollateralPool contract provides more modularity than implementing it directly into the CollateralPool contract.