Practical Flash Loan Arbitrage with Solidity and TypeScript

Define the IFlashLoan interface in solidity, detailing hop, route, and params structs for multi-protocol arbitrage and using bytes data to encode router addresses and paths.

Develop a dodo base contract by importing the flash loan interface and base, implementing a flash loan callback, and validating the loan token as base or code with route utils.

Define the IDODOInterface in Solidity with a flash run function and four external view functions: base token, base reserve, code token, and code reserve.

Explain how the flash loan contract executes a flash loan by calling the dollar based pool and Dodo pool, and overrides the flash loan callback to implement arbitrage across swaps.

Explain how the Dodo Swap mainnet pool on Polygon issues a flash loan, transferring the loan (base or the code token) to your contract and calling the flash loan callback when data is provided via the DVM flash loan call.

Illustrate a flash loan workflow using solidity and TypeScript, borrowing 100 wETH via the Dodo pool, converting through Uniswap v2 and Sushi for a net profit.

Write an abstract flash loan validation contract that enforces correct proportioning of borrowed parts using a 10000 total, via a check total part modifier and a flash loan interface import.

Implement a withdraw contract that inherits ownable and reentrancy guard to securely withdraw ERC-20 tokens via safe ERC-20 transfers, emitting indexed sender withdrawals.

Define the idodo proxy interface by declaring a swap method for token swaps. Use Uniswap v3 and v2 swap routers to perform swap exact tokens for tokens (ERC20).

Implement the internal approve token function in a flash loan contract, including token, two addresses, and a uint to 56 called mountain, and declare Send profit and swap finished events.

Write the execute flash loan function, encode params with abi encode, determine the loan token via route utils, and trigger the flash loan on the dodo pool with hardhat debugging.

Override the flash loan callback, declare and type the parameters, abi decode the data into flash params, and verify the loan amount with the ERC20 balance and a require check.

Execute the route loop function to route loan across swaps, ensuring parts sum to 100%. Use part two amount in to compute each route’s share and trigger the hop loop.

Implement the hop loop function to process a route by iterating hops, using pick protocol to swap wrapped Ethereum to USDC (and beyond), and updating amount for the next hop.

Write the internal protocol method to compute amount out based on hop protocol: v3 for protocol 0, v2 forks for 1–7, and dodo v2 for 8 and above, with logs.

Recap the flash loan callback flow: decode loan data and identify the loan token, route swaps via route and hub loops, select a protocol, and implement the swap functions.

Write the Uniswap v3 function to perform a flash loan swap by decoding input data, configuring the router and fee, approving tokens, and executing the exact input single.

Decode the input to obtain the router address, approve the router, and call Uniswap v2's swap exact tokens for tokens, returning the amount out from the second array index.

Write the DodoSwapV2 function that decodes data, determines swap direction by comparing the base token to path zero, and calls the Dodo proxy to perform a token-to-token swap.

Group uniswap imports and import IO proxy and part library, then implement the flash loan callback with arbitrage logic, balance check, repay loan, and emit swap finished and profit events.

Demonstrate how the Uniswap v3 sqrtPrice x96 derives from price p and q96, and using the quota contract to obtain amount out minimum for wrap ethereum and usdc.

Write a quoter script using ethers to statically query Uniswap v3 quotes, returning amount out and square root price x96 for a wrapped ether to ust trade at 0.3% fee.

Write and deploy a flash loan contract via a deploy contract utility using ethers, a contract factory, and type chain, including deployment logging and returning the deployed contract.

Write an execute flash loan script that constructs a flash loan transaction by obtaining the contract instance from address, abi, and signer, building flash params, and returning the transaction.

Create a util script named find router by protocol that accepts a protocol number and returns the corresponding router address from constants using object.keys.

Write unit tests for a flash loan arbitrage contract, setting up a provider and wallet on polygon fork, deploying the contract, and executing multi-hop arbitrage through Uniswap v2 and SushiSwap.

Write a funding script that impersonates a sender, funds an ERC-20 token to a flash loan contract in a Hardhat testing setup, and demonstrates on a forked mainnet.

Finish unit tests for a Solidity flash loan arbitrage flow, including setting up ERC20 token contracts, impersonation, executing a flash loan, and validating profits with chai.

Create an on-chain price utility that implements get price in Usdc to read prices from DeFi exchanges, using a router and factory, and returns the price, protocol id, and reserves.

Write an async main with a check_arbitrage function that reads on-chain prices from Polygon via router contracts, finds the min and max quotes, and triggers a $20 arbitrage flash loan.

Write the arbitrage flash loan logic in Solidity and TypeScript, configure provider, wallet, and contract, and build params to act on price differences between Uniswap and SushiSwap.

Fork the polygon network with the Falcon dashboard to simulate a flash loan on a mainnet fork. Deploy the flash loan contract and debug transactions with a visual debugger.

Execute a flash loan on the Falcon fork, wrap native currency to wrapped Ethereum, swap via Quick Swap or SushiSwap and Uniswap v2, and arbitrage before repayment.

Cache the roots array length outside the loop to cut sload and mload gas in the flashloan contract; reuse this length for memory arrays and optimize increments.

Explore practical flash loan arbitrage techniques across multiple platforms, emphasize speed with AWS and automated checks, and understand slippage and liquidity risks in automated market maker pools.

Set and validate the amountOutMin for Uniswap v3 and v2 to guard against front-running and slippage, using on-chain checks, square root price limits, and quote exact input methods.

Explore the Dodo pool contracts used for flash loans, focusing on DVM and query cell functions. Add the interface to support Usdc and Usdt pools.

An MF bot executes a flash loan arbitrage across Balancer, Curve, Wiper, and SushiSwap, converting 8.3 atm to 8.71 wrapped Ethereum and earning 0.39 ether (~$1,000).

Execute a flash loan arbitrage on mainnet by funding contract with wrapped ether, borrow 0.1 wETH, swap to usdc on sushi, swap back on quick swap, repay loan, collect profit.