Hifi Protocol

The core Hifi fixed-rate, fixed-term lending protocol. Hifi is a decentralized finance protocol that brings fixed-rate, fixed-term lending to Ethereum-based blockchains.

The build artifacts can be browsed via unpkg.com.

Installation

With yarn:

$ yarn add @hifi/protocol

Or npm:

$ npm install @hifi/protocol

Usage

The node package that you just installed contains both Solidity and JavaScript code. The former is the smart contracts themselves; the latter, the smart contract ABIs and the TypeChain bindings.

Solidity

The core Hifi protocol can only be compiled with Solidity v0.8.4 and above, because we are reverting with custom errors instead of reason strings.

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.8.4;

import "@hifi/protocol/contracts/core/balance-sheet/IBalanceSheetV2.sol";

contract YourContract {
    // Find the address on https://docs.hifi.finance
    IBalanceSheetV2 balanceSheet = IBalanceSheetV2(0x...);

    function queryAccountLiquidity(address user) external view returns (uint256 excessLiquidity, uint256 shortfallLiquidity) {
        (excessLiquidity, shortfallLiquidity) = balanceSheet.getCurrentAccountLiquidity(user);
    }

    function queryCollateralAmount(address user, IErc20 collateral) external view returns (uint256 collateralAmount) {
        collateralAmount = balanceSheet.getCollateralAmount(user, collateral);
    }

    function queryDebtAmount(address user, IHToken hToken) external view returns (uint256 debtAmount) {
        debtAmount = balanceSheet.getDebtAmount(user, hToken);
    }
}

JavaScript

import type { BalanceSheetV2__factory } from "@hifi/protocol/dist/types/factories/contracts/core/balance-sheet/BalanceSheetV2__factory";

async function queryAccountLiquidity() {
  const signer = "..."; // Get hold of an ethers.js Signer
  const balanceSheetFactory = new BalanceSheetV2__factory(signer); // Find the address on https://docs.hifi.finance
  const balanceSheet = balanceSheetFactory.attach("0x...");
  const user = "0x...";
  const accountLiquidity = await balanceSheet.getCurrentAccountLiquidity(user);
}

Deployment

Fintroller

$ yarn hardhat deploy:contract:fintroller \
    --new-owner ${NEW_OWNER} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

Chainlink Operator

$ yarn hardhat deploy:contract:chainlink-operator \
    --new-owner ${NEW_OWNER} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

Balance Sheet

$ yarn hardhat deploy:contract:balance-sheet \
    --fintroller ${FINTROLLER} \
    --oracle ${ORACLE} \
    --new-owner ${NEW_OWNER} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

HToken

$ yarn hardhat deploy:contract:h-token \
    --name ${NAME} \
    --symbol ${SYMBOL} \
    --maturity ${MATURITY} \
    --balance-sheet ${BALANCE_SHEET} \
    --fintroller ${FINTROLLER} \
    --underlying ${UNDERLYING} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

Simple Price Feed

$ yarn hardhat deploy:contract:simple-price-feed \
    --description ${DESCRIPTION} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

Stablecoin Price Feed

$ yarn hardhat deploy:contract:stablecoin-price-feed \
    --price ${PRICE} \
    --description ${DESCRIPTION} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

Uniswap V3 Price Feed

$ yarn hardhat deploy:contract:uniswap-v3-price-feed \
    --pool ${POOL} \
    --quoteAsset ${QUOTE_ASSET} \
    --twapInterval ${TWAP_INTERVAL} \
    --maxPrice ${MAX_PRICE} \
    --confirmations 5 \
    --network ${NETWORK} \
    --print true \
    --verify true

License

BUSL 1.1 © Mainframe Group Inc.