This is grim-reaper: EVM-based on-chain liquidation bot for Aave V3 built with Huff language. Optimized for gas efficiency. This repo doesn't include any off-chain architecture.
The following will need to be installed. Please follow the links and instructions.
- Install dependencies
Once you've cloned and entered into your repository, you need to install the necessary dependencies. In order to do so, simply run:
pnpm install
forge install- Build & Test
To build and test your contracts, you can run:
forge build
forge testFor more information on how to use Foundry, check out the Foundry Github Repository and the foundry-huff library repository.
| Single Liquidation (Optimizer runs: 200) | Gas Used | Bytecode Size (kB) |
|---|---|---|
| Solidity Contract | 94877 | 1.039 |
| Assembly | 94024 | 0.336 |
| Assembly (GrimReaper L2) | 94060 | 0.350 + table |
| Huff Contract | 93942 | 0.248 |
| Huff Contract (GrimReaper L2) | 93976 | 0.260 + table |
| Single Liquidation (Optimizer runs: 10_000_000) | Gas Used | Bytecode Size (kB) |
|---|---|---|
| Solidity Contract | 94301 | 1.342 |
| Assembly | 93508 | 0.363 |
| Assembly (GrimReaper L2) | 93544 | 0.377 + table |
| Huff Contract | 93438 | 0.248 |
| Huff Contract (GrimReaper L2) | 93472 | 0.260 + table |
66270gas is used for the liquidation logic itself on mock Aave v3 pool.
Note: Optimizer runs affects how well the compiler optimizes tests contract as well. So, it affects measurements.
- solc version: 0.8.24, evm version: cancun with
bytecode_hash = "none"andcbor_metadata = false. forge test -vv --mt=testGas_Liquidate
- Support limited kinds of collateral tokens and remove
collateralparameter from main entrypoint- O(1) selector table for token addresses to remove calldata size. (
GrimReaper L2) - Approve once on contract deployment instead of every liquidation
- O(1) selector table for token addresses to remove calldata size. (
- Replace
jumpiwith other operations- Use
mload(type(uint256).max)forjumpiif-else-revert pattern (GrimReaperHuff)
- Use
- Abuse
returndatasize,calldatasize,chainidandmsizeforpushoperations (GrimReaperHuff)
These smart contracts are being provided as is. No guarantee, representation or warranty is being made, express or implied, as to the safety or correctness of the user interface or the smart contracts. They have not been audited and as such there can be no assurance they will work as intended, and users may experience delays, failures, errors, omissions, loss of transmitted information or loss of funds. The creators are not liable for any of the foregoing. Users should proceed with caution and use at their own risk.