solidity-staking-vault's Introduction

solidity-staking-vault

Requirements

You are asked to write smart contracts for an ETH staking app.
User can stake their ETH in a vault (Constant APR 10%)
User gets rewarded in devUSDC (an ERC20 token you will create as well)
Assume that devUSDC is always worth $1
When a user stakes ETH: all of that ETH will be put as collateral in Compound (v2).
When a user wants to Withdraw their ETH. The vault will take out the ETH the user staked (without the yields) from Compound - and will give it back to the user with the devUSDC rewards
Minimum amount to stake is 5 ETH
To get the price of ETH you will need to use a price oracle from chainlink

Deployments

Source	Address
Vault.sol	0x714d3F5F2F1529541E306034498492c941B5C370
DevUSDC.sol	0xE592BF7Fe43a5e76BEF7E336cA846bAa57A44241

Development

Install dependencies

npm install

Lint code

npm run lint

Execute test cases

Tests are executed in a mainnet fork at block 15804036. Forking mainnet requires an active internet connection.

npx hardhat test

Configure environment variables in .env.local file

cp .env .env.local
vim .env.local

Deploy contracts

Make sure to set an appropriate GOERLI_PRIVATE_KEY variable in the .env.local file before executing any commands.

npx hardhat run --network goerli scripts/deploy.ts

Verify contracts

Make sure to set the ETHERSCAN_API_KEY variable in the .env.local file before executing any commands.

# replace placeholders with the values logged by deploy script
npx hardhat verify --network goerli <devusdc-address>
npx hardhat verify --network goerli <vault-address> <devusdc-address> <price-feed-address> <compound-ether-address>

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