This project is a simple decentrialized app where a user can deposit DAI into our smart contract. Once funds are deposited, the contract compares the interest rate of Compound & Aave, and deposits funds to whichever has the highest interest rate. The user can rebalance his/her funds to ensure that the funds are still currently in the higher interest rate protocol, and can also withdraw at any time.

• Solidity (Writing Smart Contract)
• Javascript (React & Testing)
• Web3 (Blockchain Interaction)
• Truffle (Development Framework)
• Ganache-cli (For Local Blockchain)
• Infura.io (For copying the Ethereum mainnet)
• MetaMask (Ethereum Wallet)
• Openzeppelin (Solidity Math)

• Install NodeJS, I recommend using node version 10.16.3 to avoid any potential dependency issues
• Create or log in to your Infura.io account and create a new project, and save your project ID located in your project settings, you'll need this when starting the ganache-cli server.
• Install MetaMask in your browser.
• Install Ganache-cli. To see if you have ganache-cli installed, in your command line type ganache-cli --version. To install, in your command line type npm install ganache-cli --global

$ git clone https://github.com/dappuniversity/yield-aggregator.git

$ cd yield-aggregator
$ npm install 

In a separate CMD prompt/terminal run:

$ ganache-cli -f https://mainnet.infura.io/v3/<Your-Project-ID> -m <Your-Mnemonic-Phrase> -u 0x9759A6Ac90977b93B58547b4A71c78317f391A28 -p 7545

Replace Your-Project-ID with your Infura Project ID located in the settings of your project. Replace Your-Mnemonic-Phrase with your own mnemonic phrase. If you don't have a mnemonic phrase to include you can omit it:

$ ganache-cli -f https://mainnet.infura.io/v3/<Your-Project-ID> -u 0x9759A6Ac90977b93B58547b4A71c78317f391A28 -p 7545

If you didn't include a mnemonic phrase, after starting the ganache server it will supply you with one, plus 10 accounts you can use, I recommend saving that mnemonic phrase to use it when you need to start (or restart) ganache, and import the 1st private key listed in MetaMask so you can interact with the frontend.

$ truffle migrate --reset

$ node ./mint-dai/dai.js

In a separate CMD prompt/terminal run: $ npm start

$ truffle test

Error: Returned values aren't valid, did it run Out of Gas? You might also see this error if you are not using the correct ABI for the contract you are retrieving data from, requesting data from a block number that does not exist, or querying a node which is not fully synced

This error can happen if you update the smart contract by running a migration. To solve this error, restart your Ganache-cli, run migrations, and mint DAI to your account (Essentially repeat steps 3-5 in project setup). You may have to also reset your MetaMask transactions if you completed any previous transactions, see error below.

RPC Error: Error: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"message":"the tx doesn't have the correct nonce...

You may come across this error while making a transaction, this error can happens if you previously handled any transaction with your MetaMask account and restarted your ganache-cli server. You'll have to reset your MetaMask account by going into your MetaMask settings > advanced > reset account.

Error: while migrating Migrations: Returned error: project ID does not have access to archive state

This error may come up while trying to run $ truffle test, to solve this issue, simply restart your ganache-cli. This will mean having to re-mint your account with DAI