Update: Head to Cyfrin Updraft

ℹ️ Important: This repo is no longer maintained; we invite all people learning Solidity to head to Cyfrin Updraft! The 100% free #1 smart contract education platform on earth. Developed with love by Patrick & Cyfrin <3

Requirements

• brownie
• nodejs
• ganache-cli

aave_brownie_py

Put down collateral, Borrow, and repay a loan from Aave! Use this to short assets and accrue interest.

You can see a web3 version of this here.

In our aave_borrow.py script, we do the following:

1. Approve our ETH to be swapped for WETH
2. Swap an amount of ETH for WETH
3. Using deposit_to_aave we deposit the WETH as collateral
4. We use that collateral to borrow DAI with borrow_erc20
5. Then, we pay it back!
6. We can view the txs on etherscan to see what's going on under the hood.

Setup

You'll need python installed. If working with a virtual environment, you can run:

pip install -r requirements.txt

Or, ideally you use pipx:

pip install --user pipx
pipx ensurepath
# restart your terminal
pipx install eth-brownie

You'll need the following environment variables. You can set them all in your .env file:

export WEB3_INFURA_PROJECT_ID=YourProjectID
export PRIVATE_KEY="0xasdfasdfasdfasd..."

• PRIVATE_KEY: Your Private Key from your Wallet. *Note: If using metamask, you'll have to add a 0x to the start of your private key.
• WEB3_INFURA_PROJECT_ID: Your connection to the blockchain. You can get a URL from a service like Infura]. Right now it is hard coded to work with infura, but you can modify it however you want using brownie networks modify.

Run source .env

This doesn't auto-pull in your .env file at the start, so you have to set your environment variables at the start.

And last, be sure to check the aave_dai_token if you're using a testnet DAI token. Aave sometimes changes the token they use on testnet to keep liquidity, please check here for reference. Also, feel free to check the Aave docs as well, to learn more about the tools we are using.

Quickstart - kovan

1. Get some kovan ETH

2. Get some WETH

brownie run scripts/get_weth.py --network kovan

3. Run the script!

brownie run scripts/aave_borrow.py --network kovan

Quickstart - mainnet-fork

Optional for running locally: If you want to run locally, you can install ganache-cli and yarn. Here is where you can install yarn.

yarn global add ganache-cli

Then, you can run ganache-cli --fork YOUR_INFURA_URL_HERE, or just brownie run <YOUR_SCRIPT> --network mainnet-fork

1. Get some WETH, borrow, and repay!

brownie run scripts/aave_borrow.py