@unioncredit/v2-sdk

Union v2 SDK

A library to help developers build own contracts that interact with Union protocol.

Structure

• BaseUnionMember - has the basic functions of Union member.
• UnionBorrower - implements all the functions of a Union member that can borrower from other members.
• UnionVoucher - implements all the functions of Union member that can vouch for other members.

Getting Started

Installation

npm install @unioncredit/v2-sdk

Imports

import "@unioncredit/v2-sdk/contracts/BaseUnionMember.sol";
import "@unioncredit/v2-sdk/contracts/UnionVoucher.sol";
import "@unioncredit/v2-sdk/contracts/UnionBorrower.sol";

Example Borrower

An example implementation of a contract that is a Union member. Once registered this contract would be able to borrow DAI and use it to buy OSQTH.

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@unioncredit/v2-sdk/contracts/UnionBorrower.sol";

/**
 * @notice A UnionMember that borrows DAI to go long on OSQTH
 */
contract SqueethWithFriends is UnionBorrower {
  address public dai;

  constructor(address _dai) {
    dai = _dai;
  }

  function borrowAndSqueeth(uint256 _amountInDai) external {
    _borrow(_amountInDai);
    _investInSqueeth(_amountInDai);
  }

  function sellAndRepay(uint _amountInSqueeth) external {
    _sellSqueeth(_amountInSqueeth);
    uint balance = IERC20(dai).balanceOf(address(this));
    _repayBorrow(balance);
  }

  function _investInSqueeth(uint256 _amountInDai) internal {
    // buy OSQTH with DAI
  }

  function _sellSqueeth(uint256 _amountInSqueeth) internal {
    // sell OSQTH for DAI
  }
}

Example Voucher

An example implementation of a contract that is a Union member. Once registered this contract would be able to vouch for frankfrank holders.

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@unioncredit/v2-sdk/contracts/UnionVoucher.sol";

/**
 * @notice A UnionMember that vouches for holders of frankfrank
 */
contract FrankFrankFriends is UnionVoucher {
  uint256 public vouchAmount;
  IERC721 public frank;

  constructor(uint _vouchAmount, IERC721 _frank) {
    vouchAmount = _vouchAmount;
    frank = _frank;
  }

  function stake() external {
    uint balance = IERC20(dai).balanceOf(address(this));
    _stake(balance);
  }

  function vouchForFrankFrank(address holder) external {
    require(frank.balanceOf(holder) > 0, "!holder");
    _updateTrust(holder, vouchAmount);
  }

  function cancelPaperHands(address holder) external {
    require(frank.balanceOf(holder) <= 0, "!paper hands");
    _cancelVouch(holder);
  }
}