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Earns Real Revenue — DeFi Liquidation Bot Architecture — Building a Production Keeper That Earns Real Revenue
Liquidation bots (keepers) earn the liquidation bonus on undercollateralized positions — typically 5–15% of the collateral. A well-built keeper earns $10,000–$500,000/month in liquid markets. Here is the complete production architecture. 1. Continuously monitors all open borrowing positions in a lending protocol 2. Whe...
const { ethers } = require('ethers'); class AaveLiquidationKeeper { constructor(provider, signer, aavePool, oracle) { this.provider = provider; this.signer = signer; this.aavePool = new ethers.Contract(aavePool, AAVE_POOL_ABI, signer); this.oracle = new ethers.Contract(oracle, ORACLE_ABI, provider); this.monitoredPosit...
// Use Aave flash loan to liquidate without capital contract FlashLoanLiquidator is IFlashLoanReceiver { IPool public aavePool; function liquidateWithFlashLoan( address collateralAsset, address debtAsset, address borrower, uint256 debtAmount ) external { // Flash loan the debt amount to repay aavePool.flashLoanSimple(...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
With flash loan liquidations: $0 in capital (but you pay the 0.05% flash loan fee). With direct liquidation: you need sufficient capital in the debt asset to cover 50% of the largest position you want to liquidate. Most production keepers use flash loans to avoid capital requirements.
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