文件列表:

.env.example (77, 2022-09-05)
brownie-config.yml (648, 2022-09-05)
brownie_hooks.py (46, 2022-09-05)
contracts (0, 2022-09-05)
contracts\BalancerSwapSimulator.sol (7629, 2022-09-05)
contracts\OnChainPricingMainnet.sol (33978, 2022-09-05)
contracts\OnChainPricingMainnetLenient.sol (2002, 2022-09-05)
contracts\OnChainSwapMainnet.sol (10077, 2022-09-05)
contracts\UniV3SwapSimulator.sol (9577, 2022-09-05)
contracts\archive (0, 2022-09-05)
contracts\archive\BasicOnChainPricingMainnetLenient.sol (5113, 2022-09-05)
contracts\archive\FullOnChainPricingMainnet.sol (25087, 2022-09-05)
contracts\libraries (0, 2022-09-05)
contracts\libraries\balancer (0, 2022-09-05)
contracts\libraries\balancer\BalancerFixedPoint.sol (3883, 2022-09-05)
contracts\libraries\balancer\BalancerLogExpMath.sol (19582, 2022-09-05)
contracts\libraries\balancer\BalancerMath.sol (893, 2022-09-05)
contracts\libraries\balancer\BalancerQuoter.sol (2981, 2022-09-05)
contracts\libraries\balancer\BalancerStableMath.sol (5166, 2022-09-05)
contracts\libraries\uniswap (0, 2022-09-05)
contracts\libraries\uniswap\BitMath.sol (2758, 2022-09-05)
contracts\libraries\uniswap\FixedPoint96.sol (295, 2022-09-05)
contracts\libraries\uniswap\FullMath.sol (4919, 2022-09-05)
contracts\libraries\uniswap\LiquidityMath.sol (674, 2022-09-05)
contracts\libraries\uniswap\LowGasSafeMath.sol (1609, 2022-09-05)
contracts\libraries\uniswap\SafeCast.sol (1039, 2022-09-05)
contracts\libraries\uniswap\SqrtPriceMath.sol (10704, 2022-09-05)
contracts\libraries\uniswap\SwapMath.sol (5380, 2022-09-05)
contracts\libraries\uniswap\TickBitmap.sol (3662, 2022-09-05)
contracts\libraries\uniswap\TickMath.sol (8486, 2022-09-05)
contracts\libraries\uniswap\UnsafeMath.sol (574, 2022-09-05)
contracts\tests (0, 2022-09-05)
contracts\tests\PricerWrapper.sol (2529, 2022-09-05)
helpers (0, 2022-09-05)
helpers\utils.py (309, 2022-09-05)
interfaces (0, 2022-09-05)
... ...

# Fair Selling A [BadgerDAO](https://app.badger.com/) sponsored repo of Open Source Contracts for: - Calculating onChain Prices - Executing the best onChain Swap ## Why bother We understand that we cannot prove a optimal price because at any time a new source of liquidity may be available and the contract cannot adapt. However we believe that given a set of constraints (available Dexes, handpicked), we can efficiently compute the best trade available to us In exploring this issue we aim to: - Find the most gas-efficient way to get the best executable price (currently 120 /150k per quote, from 1.6MLN) - Finding the most reliable price we can, to determine if an offer is fair or unfair (Cowswap integration) - Can we create a "trustless swap" that is provably not frontrun nor manipulated? - How would such a "self-defending" contract act and how would it be able to defend itself, get the best quote, and be certain of it (with statistical certainty) ## Current Release V0.3 - Pricer # Notable Contracts ## OnChainPricingMainnet Given a tokenIn, tokenOut and AmountIn, returns a Quote from the most popular dexes - `OnChainPricingMainnet` -> Fully onChain math to find best, single source swap (no fragmented swaps yet) - `OnChainPricingMainnetLenient` -> Slippage tollerant version of the Pricer ### Dexes Support - Curve - UniV2 - UniV3 - Balancer - Sushi Covering >80% TVL on Mainnet. (Prob even more) ## Example Usage BREAKING CHANGE: V3 is back to `view` even for Balancer and UniV3 functions ### isPairSupported Returns true if the pricer will return a non-zero quote NOTE: This is not proof of optimality ```solidity /// @dev Given tokenIn, out and amountIn, returns true if a quote will be non-zero /// @notice Doesn't guarantee optimality, just non-zero function isPairSupported(address tokenIn, address tokenOut, uint256 amountIn) external returns (bool) ``` In Brownie ```python quote = pricer.isPairSupported(t_in, t_out, amt_in) ``` ### findOptimalSwap Returns the best quote given the various Dexes, used Heuristics to save gas (V0.3 will focus on this) NOTE: While the function says optimal, this is not optimal, just best of the bunch, optimality may never be achieved fully on-chain ```solidity function findOptimalSwap(address tokenIn, address tokenOut, uint256 amountIn) external virtual returns (Quote memory) ``` In Brownie ```python quote = pricer.findOptimalSwap(t_in, t_out, amt_in) ``` # Mainnet Pricing Lenient Variation of Pricer with a slippage tollerance # Notable Tests ## Proof that the math is accurate with gas savings These tests compare the PricerV3 (150k per quote) against V2 (1.6MLN per quote) ``` brownie test tests/heuristic_equivalency/test_heuristic_equivalency.py ``` ## Benchmark specific AMM quotes TODO: Improve to just use the specific quote ``` brownie test tests/gas_benchmark/benchmark_pricer_gas.py --gas ``` ## Benchmark coverage of top DeFi Tokens TODO: Add like 200 tokens TODO: Compare against Coingecko API or smth ``` brownie test tests/gas_benchmark/benchmark_token_coverage.py --gas ``` ## Notable Test from V2 Run V3 Pricer against V2, to confirm results are correct, but with gas savings ``` brownie test tests/heuristic_equivalency/test_heuristic_equivalency.py

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