Solo Margin

dydx Flashloan
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npm init -y
npm install --save-dev hardhat
npx hardhat

npm i @openzeppelin/contracts@^4.3.2
npm install --save-dev dotenv

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If you need testnet funds, use the Alchemy testnet faucet.

This project shows how to swap, add and remove liquidity

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On DyDx the fees that you have to pay for flashloan is 2 wei

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First thing to do, set the address of the contract to call flashloan on dydx (SOLO)

Next, set up some state variable, event and struct: flashUser, Log, MyCustomData

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• Initiate a solo contract at the address of SOLO
• We need the marketId Market ID's: 0 WETH; 1 SAI, 2 USDC, 3 DAI
• Calculate the amount that we will need to repay by using _getRepaymentAmountInternal provided by DydxFlashloanBase.sol
• Approve the SOLO contract to spend the repayment amount
• The way you request a flashloan on DyDx is by creating 3 actions:
  • Withdraw: using _getWithdrawAction()
  • Call callFunction(): using _getCallAction()
  • Deposit: back using getDepositAction()
• We also need accountInfos[] that we will get by calling _getAccountInfo()
• Once we created these 3 actions in operations[], we submit it over to the solo contract by calling operate() and passing in the 3 actions and accountInfos[]

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dydx will callback this function

• We only want the solo contract to be able to call this function, require it to restrict access
• Check that the initiator of the flashloan is this contract by requiring it
• Decode the data passed from the input
• From MyCustomData decoded get back the repayAmount
• Exctract also bal to make sure we ahve enough amount to repay back the flashloan
• Write custom code: Arbitrage. For the example we just set flashUser state variable and Log bal, repay and profit variables

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We will borrow 1 000 000 USDC

To make sure we have enough amount to pay back flashloan, we will fund the contract with 2 000 000 USDC and check the balance of SOLO contract

npx hardhat test test/flashloan.test.js

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hardhat.config.js

  networks: {
        hardhat: {
          forking: {
            url: `https://eth-mainnet.alchemyapi.io/v2/${process.env.ALCHEMY_API_KEY}`,
       },
     },
  }

Note: Replace the ${} component of the URL with your personal Alchemy API key.

npx hardhat test testunlock-accounts.test.js

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This contract assumes that token0 and token1 both have same decimals

Consider Uniswap trading fee = 0.3%

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• Flashloan test
• More reading
• Arbitrage using dydx Flashloan

See the open issues for a full list of proposed features (and known issues).

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Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

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Distributed under the MIT License. See LICENSE.txt for more information.

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Reda Aboutika - @twitter - [email protected]

Project Link: https://github.com/Aboudoc/dydx-Flashloan.git

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• Smart Contract Engineer

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