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Adjust Oracle Ca... | 15501968 | 818 days ago | IN | 0 ETH | 0.06431325 |
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Contract Name:
UniswapV3PriceProvider
Compiler Version
v0.7.6+commit.7338295f
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: BUSL-1.1 pragma solidity 0.7.6; pragma abicoder v2; import "@uniswap/v3-periphery/contracts/libraries/OracleLibrary.sol"; import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Factory.sol"; import "../../utils/TwoStepOwnable.sol"; import "../PriceProvider.sol"; import "../IERC20Like.sol"; /// @title UniswapV3PriceProvider /// @notice Price provider contract that reads prices from UniswapV3 contract UniswapV3PriceProvider is PriceProvider, TwoStepOwnable { struct PriceCalculationData { // Number of seconds for which time-weighted average should be calculated, ie. 1800 means 30 min uint32 periodForAvgPrice; // Estimated blockchain block time uint8 blockTime; } bytes32 private constant _OLD_ERROR_HASH = keccak256(abi.encodeWithSignature("Error(string)", "OLD")); /// @dev this is basically `PriceProvider.quoteToken.decimals()` uint256 private immutable _QUOTE_TOKEN_DECIMALS; // solhint-disable-line var-name-mixedcase /// @dev block time is used to estimate the average number of blocks minted in `periodForAvgPrice` /// block time tends to go down (not up), temporary deviations are not important /// Ethereum's block time is almost never higher than ~15 sec, so in practice we shouldn't need to set it above that /// 60 was chosen as an arbitrary maximum just to prevent human errors uint256 private constant _MAX_ACCEPTED_BLOCK_TIME = 60; /// @dev UniswapV3 factory contract IUniswapV3Factory public immutable uniswapV3Factory; /// @dev priceCalculationData: /// - periodForAvgPrice: Number of seconds for which time-weighted average should be calculated, ie. 1800 is 30 min /// - blockTime: Estimated blockchain block time PriceCalculationData public priceCalculationData; /// @notice Maps asset address to UniV3 pool mapping(address => IUniswapV3Pool) public pools; /// @notice Emitted when TWAP period changes /// @param period new period in seconds, ie. 1800 means 30 min event NewPeriod(uint32 period); /// @notice Emitted when blockTime changes /// @param blockTime block time in seconds event NewBlockTime(uint8 blockTime); /// @notice Emitted when UniV3 pool is set for asset /// @param asset asset address /// @param pool UniV3 pool address event PoolForAsset(address indexed asset, IUniswapV3Pool indexed pool); /// @param _priceProvidersRepository address of PriceProvidersRepository /// @param _factory UniswapV3 factory contract /// @param _priceCalculationData: /// - _periodForAvgPrice period in seconds for TWAP price, ie. 1800 means 30 min /// - _blockTime estimated block time, it is better to set it bit lower than higher that avg block time /// eg. if ETH block time is 13~13.5s, you can set it to 12s constructor( IPriceProvidersRepository _priceProvidersRepository, IUniswapV3Factory _factory, PriceCalculationData memory _priceCalculationData ) PriceProvider(_priceProvidersRepository) { uint24 defaultFee = 500; // Ping for _priceProvidersRepository is not needed here, because PriceProvider does it if (_factory.feeAmountTickSpacing(defaultFee) == 0) revert("InvalidFactory"); if (_priceCalculationData.periodForAvgPrice == 0) revert("InvalidPeriodForAvgPrice"); if ( _priceCalculationData.blockTime == 0 || _priceCalculationData.blockTime >= _MAX_ACCEPTED_BLOCK_TIME ) { revert("InvalidBlockTime"); } _validatePriceCalculationData( _priceCalculationData.periodForAvgPrice, _priceCalculationData.blockTime ); uniswapV3Factory = _factory; priceCalculationData = _priceCalculationData; _QUOTE_TOKEN_DECIMALS = IERC20Like(_priceProvidersRepository.quoteToken()).decimals(); } /// @notice Setup pool for asset. Use it also for update, when you want to change pool for asset. /// Notice: pool must be ready for providing price. See `adjustOracleCardinality`. /// @param _asset asset address /// @param _pool UniV3 pool address function setupAsset(address _asset, IUniswapV3Pool _pool) external onlyManager { verifyPool(_asset, _pool); pools[_asset] = _pool; emit PoolForAsset(_asset, _pool); // make sure getPrice does not revert getPrice(_asset); } /// @notice Change period for which to calculated TWAP prices /// @dev WARNING: when we increase this period, then UniV3 pool that is already initialized /// and set as oracle for asset, will not immediately adjust to new time window. /// We need to call `adjustOracleCardinality` and then wait for buffer to filled up. /// Until that happen, TWAP price will be fetched for shorter period (because of time window adjustment feature). /// @param _period new period in seconds, ie. 1800 means 30 min function changePeriodForAvgPrice(uint32 _period) external onlyManager { // `_period < block.timestamp` is because we making sure we do not underflow if (_period == 0 || _period >= block.timestamp) revert("InvalidPeriodForAvgPrice"); if (priceCalculationData.periodForAvgPrice == _period) revert("PeriodForAvgPriceDidNotChange"); _validatePriceCalculationData(_period, priceCalculationData.blockTime); priceCalculationData.periodForAvgPrice = _period; emit NewPeriod(_period); } /// @notice Change block time which is used to adjust oracle cardinality fot providing TWAP prices /// @param _blockTime it is better to set it bit lower than higher that avg block time /// eg. if ETH block time is 13~13.5s, you can set it to 11-12s /// based on `priceCalculationData.periodForAvgPrice` and `priceCalculationData.blockTime` price provider calculates /// number of blocks for (cardinality) requires for TWAP price. Unfortunately block time can change and this /// can lead to issues with getting price. Edge case will be when we set `_blockTime` to 1, then we have 100% /// guarantee, that no matter how real block time changes, we always can get price. /// Downside will be cost of initialization. That's why it is better to set a bit lower /// and adjust (decrease) in case of issues. function changeBlockTime(uint8 _blockTime) external onlyManager { if (_blockTime == 0 || _blockTime >= _MAX_ACCEPTED_BLOCK_TIME) revert("InvalidBlockTime"); if (priceCalculationData.blockTime == _blockTime) revert("BlockTimeDidNotChange"); _validatePriceCalculationData(priceCalculationData.periodForAvgPrice, _blockTime); priceCalculationData.blockTime = _blockTime; emit NewBlockTime(_blockTime); } /// @notice Adjust UniV3 pool cardinality to Silo's requirements. /// Call `observationsStatus` to see, if you need to execute this method. /// This method prepares pool for setup for price provider. In order to run `setupAsset` for asset, /// pool must have buffer to provide TWAP price. By calling this adjustment (and waiting necessary amount of time) /// pool will be ready for setup. It will collect valid number of observations, so the pool can be used /// once price data is ready. /// @dev Increases observation cardinality for univ3 oracle pool if needed, see getPrice desc for details. /// We should call it on init and when we are changing the pool (univ3 can have multiple pools for the same tokens) /// @param _pool UniV3 pool address function adjustOracleCardinality(IUniswapV3Pool _pool) external { (,,,, uint16 cardinalityNext,,) = _pool.slot0(); PriceCalculationData memory data = priceCalculationData; // ideally we want to have data at every block during periodForAvgPrice // If we want to get TWAP for 5 minutes and assuming we have tx in every block, and block time is 15 sec, // then for 5 minutes we will have 20 blocks, that means our requiredCardinality is 20. uint256 requiredCardinality = data.periodForAvgPrice / data.blockTime; if (cardinalityNext >= requiredCardinality) revert("NotNecessary"); // initialize required amount of slots, it will cost! _pool.increaseObservationCardinalityNext(uint16(requiredCardinality)); } /// @inheritdoc IPriceProvider function assetSupported(address _asset) external view override returns (bool) { return address(pools[_asset]) != address(0) || _asset == quoteToken; } /// @notice This method can provide TWAP quote token price denominated in any other token /// it does NOT validate input pool, so you must be sure you providing correct one /// otherwise result will be wrong or function will throw. /// If pool is correct and it still throwing, please check `observationsStatus(_pool)`. /// @param _pool UniswapV3Pool address that can provide TWAP price and one of the tokens is native (quote) token function quotePrice(IUniswapV3Pool _pool) external view returns (uint256 price) { address base = quoteToken; address token0 = _pool.token0(); address quote = base == token0 ? _pool.token1() : token0; uint128 baseAmount = uint128(10 ** _QUOTE_TOKEN_DECIMALS); int24 timeWeightedAverageTick = _consult(_pool); price = OracleLibrary.getQuoteAtTick(timeWeightedAverageTick, baseAmount, base, quote); } function assetOldestTimestamp(address _asset) external view returns (uint32 oldestTimestamp) { IUniswapV3Pool pool = pools[_asset]; (,, uint16 observationIndex, uint16 currentObservationCardinality,,,) = pool.slot0(); oldestTimestamp = resolveOldestObservationTimestamp(pool, observationIndex, currentObservationCardinality); } /// @notice Check if UniV3 pool has enough cardinality to meet Silo's requirements /// If it does not have, please execute `adjustOracleCardinality`. /// @param _pool UniV3 pool address /// @return bufferFull TRUE if buffer is ready to provide TWAP price rof required period /// @return enoughObservations TRUE if buffer has enough observations spots (they don't have to be filled up yet) function observationsStatus(IUniswapV3Pool _pool) public view returns ( bool bufferFull, bool enoughObservations, uint16 currentCardinality ) { PriceCalculationData memory data = priceCalculationData; ( ,,, uint16 currentObservationCardinality, uint16 observationCardinalityNext,, ) = _pool.slot0(); // ideally we want to have data at every block during periodForAvgPrice uint256 requiredCardinality = data.periodForAvgPrice / data.blockTime; bufferFull = currentObservationCardinality >= requiredCardinality; enoughObservations = observationCardinalityNext >= requiredCardinality; currentCardinality = currentObservationCardinality; } /// @dev It verifies, if provider pool for asset (and quote token) is valid. /// Throws when there is no pool or pool is empty (zero liquidity) or not ready for price /// @param _asset asset for which prices are going to be calculated /// @param _pool UniV3 pool address /// @return true if verification successful, otherwise throws function verifyPool(address _asset, IUniswapV3Pool _pool) public view returns (bool) { if (_asset == address(0)) revert("AssetIsZero"); if (address(_pool) == address(0)) revert("PoolIsZero"); address quote = quoteToken; uint24 fee = _pool.fee(); if (uniswapV3Factory.getPool(_asset, quote, fee) != address(_pool)) revert("InvalidPoolForAsset"); uint256 liquidity = IERC20Like(quote).balanceOf(address(_pool)); if (liquidity == 0) revert("EmptyPool"); (bool bufferFull,,) = observationsStatus(_pool); if (!bufferFull) revert("BufferNotFull"); return true; } /// @dev UniV3 saves price only on: mint, burn and swap. /// Mint and burn will write observation only when "current tick is inside the passed range" of ticks. /// I think that means, that if we minting/burning outside ticks range (so outside current price) /// it will not modify observation. So we left with swap. /// /// Swap will write observation under this condition: /// // update tick and write an oracle entry if the tick change /// if (state.tick != slot0Start.tick) { /// that means, it is possible that price will be up to date (in a range of same tick) /// but observation timestamp will be old. /// /// Every pool by default comes with just one slot for observation (cardinality == 1). /// We can increase number of slots so TWAP price will be "better". /// When we increase, we have to wait until new tx will write new observation. /// Based on all above, we can tell how old is observation, but this does not mean the price is wrong. /// UniV3 recommends to use `observe` and `OracleLibrary.consult` uses it. /// `observe` reverts if `secondsAgo` > oldest observation, means, if there is any price observation in selected /// time frame, it will revert. Otherwise it will return either exact TWAP price or by interpolation. /// /// Conclusion: we can choose how many observation pool will be storing, but we need to remember, /// not all of them might be used to provide our price. Final question is: how many observations we need? /// /// How UniV3 calculates TWAP /// we ask for TWAP on time range ago:now using `OracleLibrary.consult`, it is all about find the right tick /// - we call `IUniswapV3Pool(pool).observe(secondAgo)` that returns two accumulator values (for ago and now) /// - each observation is resolved by `observeSingle` /// - for _now_ we just using latest observation, and if it does not match timestamp, we interpolate (!) /// and this is how we got the _tickCumulative_, so in extreme situation, if last observation was made day ago, /// UniV3 will interpolate to reflect _tickCumulative_ at current time /// - for _ago_ we search for observation using `getSurroundingObservations` that give us /// before and after observation, base on which we calculate "avg" and we have target _tickCumulative_ /// - getSurroundingObservations: it's job is to find 2 observations based on which we calculate tickCumulative /// here is where all calculations can revert, if ago < oldest observation, otherwise it will be calculated /// either by interpolation or we will have exact match /// - now with both _tickCumulative_s we calculating TWAP /// /// recommended observations are = 30 min / blockTime /// @inheritdoc IPriceProvider function getPrice(address _asset) public view override returns (uint256 price) { address quote = quoteToken; if (_asset == quote) { return 10 ** _QUOTE_TOKEN_DECIMALS; } uint256 decimals = IERC20Like(_asset).decimals(); require(decimals <= 38, "power overflow"); // we need 10**decimals be less than 2**128 uint256 baseAmount = 10 ** decimals; IUniswapV3Pool pool = pools[_asset]; if (address(pool) == address(0)) revert("PoolNotSet"); int24 timeWeightedAverageTick = _consult(pool); price = OracleLibrary.getQuoteAtTick(timeWeightedAverageTick, uint128(baseAmount), _asset, quote); } /// @param _pool uniswap V3 pool address /// @param _currentObservationIndex the most-recently updated index of the observations array /// @param _currentObservationCardinality the current maximum number of observations that are being stored /// @return oldestTimestamp last observation timestamp function resolveOldestObservationTimestamp( IUniswapV3Pool _pool, uint16 _currentObservationIndex, uint16 _currentObservationCardinality ) public view returns (uint32 oldestTimestamp) { bool initialized; ( oldestTimestamp,,, initialized ) = _pool.observations((_currentObservationIndex + 1) % _currentObservationCardinality); // if not initialized, we just check id#0 as this will be the oldest if (!initialized) { (oldestTimestamp,,,) = _pool.observations(0); } } /// @notice Fetches time-weighted average tick using Uniswap V3 oracle /// @dev this is based on `OracleLibrary.consult`, we adjusted it to handle `OLD` error, time window will adjust /// to available pool observations /// @param _pool Address of Uniswap V3 pool that we want to observe /// @return timeWeightedAverageTick time-weighted average tick from (block.timestamp - period) to block.timestamp function _consult(IUniswapV3Pool _pool) internal view returns (int24 timeWeightedAverageTick) { (uint32 period, int56[] memory tickCumulatives) = _calculatePeriodAndTicks(_pool); int56 tickCumulativesDelta = tickCumulatives[1] - tickCumulatives[0]; timeWeightedAverageTick = int24(tickCumulativesDelta / period); // Always round to negative infinity if (tickCumulativesDelta < 0 && (tickCumulativesDelta % period != 0)) timeWeightedAverageTick--; } /// @param _pool Address of Uniswap V3 pool /// @return period Number of seconds in the past to start calculating time-weighted average /// @return tickCumulatives Cumulative tick values as of each secondsAgos from the current block timestamp function _calculatePeriodAndTicks(IUniswapV3Pool _pool) internal view returns (uint32 period, int56[] memory tickCumulatives) { period = priceCalculationData.periodForAvgPrice; bool old; (tickCumulatives, old) = _observe(_pool, period); if (old) { (,, uint16 observationIndex, uint16 currentObservationCardinality,,,) = _pool.slot0(); uint32 latestTimestamp = resolveOldestObservationTimestamp(_pool, observationIndex, currentObservationCardinality); period = uint32(block.timestamp - latestTimestamp); (tickCumulatives, old) = _observe(_pool, period); if (old) revert("STILL OLD"); } } /// @param _pool UniV3 pool address /// @param _period Number of seconds in the past to start calculating time-weighted average function _observe(IUniswapV3Pool _pool, uint32 _period) internal view returns (int56[] memory tickCumulatives, bool old) { uint32[] memory secondAgos = new uint32[](2); secondAgos[0] = _period; // secondAgos[1] = 0; // default is 0 try _pool.observe(secondAgos) returns (int56[] memory ticks, uint160[] memory) { tickCumulatives = ticks; old = false; } catch (bytes memory reason) { if (keccak256(reason) != _OLD_ERROR_HASH) _revertBytes(reason, "_observe"); old = true; } } function _validatePriceCalculationData(uint32 _periodForAvgPrice, uint8 _blockTime) private pure { uint256 requiredCardinality = _periodForAvgPrice / _blockTime; if (requiredCardinality > type(uint16).max) revert("InvalidRequiredCardinality"); } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title The interface for the Uniswap V3 Factory /// @notice The Uniswap V3 Factory facilitates creation of Uniswap V3 pools and control over the protocol fees interface IUniswapV3Factory { /// @notice Emitted when the owner of the factory is changed /// @param oldOwner The owner before the owner was changed /// @param newOwner The owner after the owner was changed event OwnerChanged(address indexed oldOwner, address indexed newOwner); /// @notice Emitted when a pool is created /// @param token0 The first token of the pool by address sort order /// @param token1 The second token of the pool by address sort order /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip /// @param tickSpacing The minimum number of ticks between initialized ticks /// @param pool The address of the created pool event PoolCreated( address indexed token0, address indexed token1, uint24 indexed fee, int24 tickSpacing, address pool ); /// @notice Emitted when a new fee amount is enabled for pool creation via the factory /// @param fee The enabled fee, denominated in hundredths of a bip /// @param tickSpacing The minimum number of ticks between initialized ticks for pools created with the given fee event FeeAmountEnabled(uint24 indexed fee, int24 indexed tickSpacing); /// @notice Returns the current owner of the factory /// @dev Can be changed by the current owner via setOwner /// @return The address of the factory owner function owner() external view returns (address); /// @notice Returns the tick spacing for a given fee amount, if enabled, or 0 if not enabled /// @dev A fee amount can never be removed, so this value should be hard coded or cached in the calling context /// @param fee The enabled fee, denominated in hundredths of a bip. Returns 0 in case of unenabled fee /// @return The tick spacing function feeAmountTickSpacing(uint24 fee) external view returns (int24); /// @notice Returns the pool address for a given pair of tokens and a fee, or address 0 if it does not exist /// @dev tokenA and tokenB may be passed in either token0/token1 or token1/token0 order /// @param tokenA The contract address of either token0 or token1 /// @param tokenB The contract address of the other token /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip /// @return pool The pool address function getPool( address tokenA, address tokenB, uint24 fee ) external view returns (address pool); /// @notice Creates a pool for the given two tokens and fee /// @param tokenA One of the two tokens in the desired pool /// @param tokenB The other of the two tokens in the desired pool /// @param fee The desired fee for the pool /// @dev tokenA and tokenB may be passed in either order: token0/token1 or token1/token0. tickSpacing is retrieved /// from the fee. The call will revert if the pool already exists, the fee is invalid, or the token arguments /// are invalid. /// @return pool The address of the newly created pool function createPool( address tokenA, address tokenB, uint24 fee ) external returns (address pool); /// @notice Updates the owner of the factory /// @dev Must be called by the current owner /// @param _owner The new owner of the factory function setOwner(address _owner) external; /// @notice Enables a fee amount with the given tickSpacing /// @dev Fee amounts may never be removed once enabled /// @param fee The fee amount to enable, denominated in hundredths of a bip (i.e. 1e-6) /// @param tickSpacing The spacing between ticks to be enforced for all pools created with the given fee amount function enableFeeAmount(uint24 fee, int24 tickSpacing) external; }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; import './pool/IUniswapV3PoolImmutables.sol'; import './pool/IUniswapV3PoolState.sol'; import './pool/IUniswapV3PoolDerivedState.sol'; import './pool/IUniswapV3PoolActions.sol'; import './pool/IUniswapV3PoolOwnerActions.sol'; import './pool/IUniswapV3PoolEvents.sol'; /// @title The interface for a Uniswap V3 Pool /// @notice A Uniswap pool facilitates swapping and automated market making between any two assets that strictly conform /// to the ERC20 specification /// @dev The pool interface is broken up into many smaller pieces interface IUniswapV3Pool is IUniswapV3PoolImmutables, IUniswapV3PoolState, IUniswapV3PoolDerivedState, IUniswapV3PoolActions, IUniswapV3PoolOwnerActions, IUniswapV3PoolEvents { }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Permissionless pool actions /// @notice Contains pool methods that can be called by anyone interface IUniswapV3PoolActions { /// @notice Sets the initial price for the pool /// @dev Price is represented as a sqrt(amountToken1/amountToken0) Q64.96 value /// @param sqrtPriceX96 the initial sqrt price of the pool as a Q64.96 function initialize(uint160 sqrtPriceX96) external; /// @notice Adds liquidity for the given recipient/tickLower/tickUpper position /// @dev The caller of this method receives a callback in the form of IUniswapV3MintCallback#uniswapV3MintCallback /// in which they must pay any token0 or token1 owed for the liquidity. The amount of token0/token1 due depends /// on tickLower, tickUpper, the amount of liquidity, and the current price. /// @param recipient The address for which the liquidity will be created /// @param tickLower The lower tick of the position in which to add liquidity /// @param tickUpper The upper tick of the position in which to add liquidity /// @param amount The amount of liquidity to mint /// @param data Any data that should be passed through to the callback /// @return amount0 The amount of token0 that was paid to mint the given amount of liquidity. Matches the value in the callback /// @return amount1 The amount of token1 that was paid to mint the given amount of liquidity. Matches the value in the callback function mint( address recipient, int24 tickLower, int24 tickUpper, uint128 amount, bytes calldata data ) external returns (uint256 amount0, uint256 amount1); /// @notice Collects tokens owed to a position /// @dev Does not recompute fees earned, which must be done either via mint or burn of any amount of liquidity. /// Collect must be called by the position owner. To withdraw only token0 or only token1, amount0Requested or /// amount1Requested may be set to zero. To withdraw all tokens owed, caller may pass any value greater than the /// actual tokens owed, e.g. type(uint128).max. Tokens owed may be from accumulated swap fees or burned liquidity. /// @param recipient The address which should receive the fees collected /// @param tickLower The lower tick of the position for which to collect fees /// @param tickUpper The upper tick of the position for which to collect fees /// @param amount0Requested How much token0 should be withdrawn from the fees owed /// @param amount1Requested How much token1 should be withdrawn from the fees owed /// @return amount0 The amount of fees collected in token0 /// @return amount1 The amount of fees collected in token1 function collect( address recipient, int24 tickLower, int24 tickUpper, uint128 amount0Requested, uint128 amount1Requested ) external returns (uint128 amount0, uint128 amount1); /// @notice Burn liquidity from the sender and account tokens owed for the liquidity to the position /// @dev Can be used to trigger a recalculation of fees owed to a position by calling with an amount of 0 /// @dev Fees must be collected separately via a call to #collect /// @param tickLower The lower tick of the position for which to burn liquidity /// @param tickUpper The upper tick of the position for which to burn liquidity /// @param amount How much liquidity to burn /// @return amount0 The amount of token0 sent to the recipient /// @return amount1 The amount of token1 sent to the recipient function burn( int24 tickLower, int24 tickUpper, uint128 amount ) external returns (uint256 amount0, uint256 amount1); /// @notice Swap token0 for token1, or token1 for token0 /// @dev The caller of this method receives a callback in the form of IUniswapV3SwapCallback#uniswapV3SwapCallback /// @param recipient The address to receive the output of the swap /// @param zeroForOne The direction of the swap, true for token0 to token1, false for token1 to token0 /// @param amountSpecified The amount of the swap, which implicitly configures the swap as exact input (positive), or exact output (negative) /// @param sqrtPriceLimitX96 The Q64.96 sqrt price limit. If zero for one, the price cannot be less than this /// value after the swap. If one for zero, the price cannot be greater than this value after the swap /// @param data Any data to be passed through to the callback /// @return amount0 The delta of the balance of token0 of the pool, exact when negative, minimum when positive /// @return amount1 The delta of the balance of token1 of the pool, exact when negative, minimum when positive function swap( address recipient, bool zeroForOne, int256 amountSpecified, uint160 sqrtPriceLimitX96, bytes calldata data ) external returns (int256 amount0, int256 amount1); /// @notice Receive token0 and/or token1 and pay it back, plus a fee, in the callback /// @dev The caller of this method receives a callback in the form of IUniswapV3FlashCallback#uniswapV3FlashCallback /// @dev Can be used to donate underlying tokens pro-rata to currently in-range liquidity providers by calling /// with 0 amount{0,1} and sending the donation amount(s) from the callback /// @param recipient The address which will receive the token0 and token1 amounts /// @param amount0 The amount of token0 to send /// @param amount1 The amount of token1 to send /// @param data Any data to be passed through to the callback function flash( address recipient, uint256 amount0, uint256 amount1, bytes calldata data ) external; /// @notice Increase the maximum number of price and liquidity observations that this pool will store /// @dev This method is no-op if the pool already has an observationCardinalityNext greater than or equal to /// the input observationCardinalityNext. /// @param observationCardinalityNext The desired minimum number of observations for the pool to store function increaseObservationCardinalityNext(uint16 observationCardinalityNext) external; }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Pool state that is not stored /// @notice Contains view functions to provide information about the pool that is computed rather than stored on the /// blockchain. The functions here may have variable gas costs. interface IUniswapV3PoolDerivedState { /// @notice Returns the cumulative tick and liquidity as of each timestamp `secondsAgo` from the current block timestamp /// @dev To get a time weighted average tick or liquidity-in-range, you must call this with two values, one representing /// the beginning of the period and another for the end of the period. E.g., to get the last hour time-weighted average tick, /// you must call it with secondsAgos = [3600, 0]. /// @dev The time weighted average tick represents the geometric time weighted average price of the pool, in /// log base sqrt(1.0001) of token1 / token0. The TickMath library can be used to go from a tick value to a ratio. /// @param secondsAgos From how long ago each cumulative tick and liquidity value should be returned /// @return tickCumulatives Cumulative tick values as of each `secondsAgos` from the current block timestamp /// @return secondsPerLiquidityCumulativeX128s Cumulative seconds per liquidity-in-range value as of each `secondsAgos` from the current block /// timestamp function observe(uint32[] calldata secondsAgos) external view returns (int56[] memory tickCumulatives, uint160[] memory secondsPerLiquidityCumulativeX128s); /// @notice Returns a snapshot of the tick cumulative, seconds per liquidity and seconds inside a tick range /// @dev Snapshots must only be compared to other snapshots, taken over a period for which a position existed. /// I.e., snapshots cannot be compared if a position is not held for the entire period between when the first /// snapshot is taken and the second snapshot is taken. /// @param tickLower The lower tick of the range /// @param tickUpper The upper tick of the range /// @return tickCumulativeInside The snapshot of the tick accumulator for the range /// @return secondsPerLiquidityInsideX128 The snapshot of seconds per liquidity for the range /// @return secondsInside The snapshot of seconds per liquidity for the range function snapshotCumulativesInside(int24 tickLower, int24 tickUpper) external view returns ( int56 tickCumulativeInside, uint160 secondsPerLiquidityInsideX128, uint32 secondsInside ); }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Events emitted by a pool /// @notice Contains all events emitted by the pool interface IUniswapV3PoolEvents { /// @notice Emitted exactly once by a pool when #initialize is first called on the pool /// @dev Mint/Burn/Swap cannot be emitted by the pool before Initialize /// @param sqrtPriceX96 The initial sqrt price of the pool, as a Q64.96 /// @param tick The initial tick of the pool, i.e. log base 1.0001 of the starting price of the pool event Initialize(uint160 sqrtPriceX96, int24 tick); /// @notice Emitted when liquidity is minted for a given position /// @param sender The address that minted the liquidity /// @param owner The owner of the position and recipient of any minted liquidity /// @param tickLower The lower tick of the position /// @param tickUpper The upper tick of the position /// @param amount The amount of liquidity minted to the position range /// @param amount0 How much token0 was required for the minted liquidity /// @param amount1 How much token1 was required for the minted liquidity event Mint( address sender, address indexed owner, int24 indexed tickLower, int24 indexed tickUpper, uint128 amount, uint256 amount0, uint256 amount1 ); /// @notice Emitted when fees are collected by the owner of a position /// @dev Collect events may be emitted with zero amount0 and amount1 when the caller chooses not to collect fees /// @param owner The owner of the position for which fees are collected /// @param tickLower The lower tick of the position /// @param tickUpper The upper tick of the position /// @param amount0 The amount of token0 fees collected /// @param amount1 The amount of token1 fees collected event Collect( address indexed owner, address recipient, int24 indexed tickLower, int24 indexed tickUpper, uint128 amount0, uint128 amount1 ); /// @notice Emitted when a position's liquidity is removed /// @dev Does not withdraw any fees earned by the liquidity position, which must be withdrawn via #collect /// @param owner The owner of the position for which liquidity is removed /// @param tickLower The lower tick of the position /// @param tickUpper The upper tick of the position /// @param amount The amount of liquidity to remove /// @param amount0 The amount of token0 withdrawn /// @param amount1 The amount of token1 withdrawn event Burn( address indexed owner, int24 indexed tickLower, int24 indexed tickUpper, uint128 amount, uint256 amount0, uint256 amount1 ); /// @notice Emitted by the pool for any swaps between token0 and token1 /// @param sender The address that initiated the swap call, and that received the callback /// @param recipient The address that received the output of the swap /// @param amount0 The delta of the token0 balance of the pool /// @param amount1 The delta of the token1 balance of the pool /// @param sqrtPriceX96 The sqrt(price) of the pool after the swap, as a Q64.96 /// @param liquidity The liquidity of the pool after the swap /// @param tick The log base 1.0001 of price of the pool after the swap event Swap( address indexed sender, address indexed recipient, int256 amount0, int256 amount1, uint160 sqrtPriceX96, uint128 liquidity, int24 tick ); /// @notice Emitted by the pool for any flashes of token0/token1 /// @param sender The address that initiated the swap call, and that received the callback /// @param recipient The address that received the tokens from flash /// @param amount0 The amount of token0 that was flashed /// @param amount1 The amount of token1 that was flashed /// @param paid0 The amount of token0 paid for the flash, which can exceed the amount0 plus the fee /// @param paid1 The amount of token1 paid for the flash, which can exceed the amount1 plus the fee event Flash( address indexed sender, address indexed recipient, uint256 amount0, uint256 amount1, uint256 paid0, uint256 paid1 ); /// @notice Emitted by the pool for increases to the number of observations that can be stored /// @dev observationCardinalityNext is not the observation cardinality until an observation is written at the index /// just before a mint/swap/burn. /// @param observationCardinalityNextOld The previous value of the next observation cardinality /// @param observationCardinalityNextNew The updated value of the next observation cardinality event IncreaseObservationCardinalityNext( uint16 observationCardinalityNextOld, uint16 observationCardinalityNextNew ); /// @notice Emitted when the protocol fee is changed by the pool /// @param feeProtocol0Old The previous value of the token0 protocol fee /// @param feeProtocol1Old The previous value of the token1 protocol fee /// @param feeProtocol0New The updated value of the token0 protocol fee /// @param feeProtocol1New The updated value of the token1 protocol fee event SetFeeProtocol(uint8 feeProtocol0Old, uint8 feeProtocol1Old, uint8 feeProtocol0New, uint8 feeProtocol1New); /// @notice Emitted when the collected protocol fees are withdrawn by the factory owner /// @param sender The address that collects the protocol fees /// @param recipient The address that receives the collected protocol fees /// @param amount0 The amount of token0 protocol fees that is withdrawn /// @param amount0 The amount of token1 protocol fees that is withdrawn event CollectProtocol(address indexed sender, address indexed recipient, uint128 amount0, uint128 amount1); }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Pool state that never changes /// @notice These parameters are fixed for a pool forever, i.e., the methods will always return the same values interface IUniswapV3PoolImmutables { /// @notice The contract that deployed the pool, which must adhere to the IUniswapV3Factory interface /// @return The contract address function factory() external view returns (address); /// @notice The first of the two tokens of the pool, sorted by address /// @return The token contract address function token0() external view returns (address); /// @notice The second of the two tokens of the pool, sorted by address /// @return The token contract address function token1() external view returns (address); /// @notice The pool's fee in hundredths of a bip, i.e. 1e-6 /// @return The fee function fee() external view returns (uint24); /// @notice The pool tick spacing /// @dev Ticks can only be used at multiples of this value, minimum of 1 and always positive /// e.g.: a tickSpacing of 3 means ticks can be initialized every 3rd tick, i.e., ..., -6, -3, 0, 3, 6, ... /// This value is an int24 to avoid casting even though it is always positive. /// @return The tick spacing function tickSpacing() external view returns (int24); /// @notice The maximum amount of position liquidity that can use any tick in the range /// @dev This parameter is enforced per tick to prevent liquidity from overflowing a uint128 at any point, and /// also prevents out-of-range liquidity from being used to prevent adding in-range liquidity to a pool /// @return The max amount of liquidity per tick function maxLiquidityPerTick() external view returns (uint128); }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Permissioned pool actions /// @notice Contains pool methods that may only be called by the factory owner interface IUniswapV3PoolOwnerActions { /// @notice Set the denominator of the protocol's % share of the fees /// @param feeProtocol0 new protocol fee for token0 of the pool /// @param feeProtocol1 new protocol fee for token1 of the pool function setFeeProtocol(uint8 feeProtocol0, uint8 feeProtocol1) external; /// @notice Collect the protocol fee accrued to the pool /// @param recipient The address to which collected protocol fees should be sent /// @param amount0Requested The maximum amount of token0 to send, can be 0 to collect fees in only token1 /// @param amount1Requested The maximum amount of token1 to send, can be 0 to collect fees in only token0 /// @return amount0 The protocol fee collected in token0 /// @return amount1 The protocol fee collected in token1 function collectProtocol( address recipient, uint128 amount0Requested, uint128 amount1Requested ) external returns (uint128 amount0, uint128 amount1); }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Pool state that can change /// @notice These methods compose the pool's state, and can change with any frequency including multiple times /// per transaction interface IUniswapV3PoolState { /// @notice The 0th storage slot in the pool stores many values, and is exposed as a single method to save gas /// when accessed externally. /// @return sqrtPriceX96 The current price of the pool as a sqrt(token1/token0) Q64.96 value /// tick The current tick of the pool, i.e. according to the last tick transition that was run. /// This value may not always be equal to SqrtTickMath.getTickAtSqrtRatio(sqrtPriceX96) if the price is on a tick /// boundary. /// observationIndex The index of the last oracle observation that was written, /// observationCardinality The current maximum number of observations stored in the pool, /// observationCardinalityNext The next maximum number of observations, to be updated when the observation. /// feeProtocol The protocol fee for both tokens of the pool. /// Encoded as two 4 bit values, where the protocol fee of token1 is shifted 4 bits and the protocol fee of token0 /// is the lower 4 bits. Used as the denominator of a fraction of the swap fee, e.g. 4 means 1/4th of the swap fee. /// unlocked Whether the pool is currently locked to reentrancy function slot0() external view returns ( uint160 sqrtPriceX96, int24 tick, uint16 observationIndex, uint16 observationCardinality, uint16 observationCardinalityNext, uint8 feeProtocol, bool unlocked ); /// @notice The fee growth as a Q128.128 fees of token0 collected per unit of liquidity for the entire life of the pool /// @dev This value can overflow the uint256 function feeGrowthGlobal0X128() external view returns (uint256); /// @notice The fee growth as a Q128.128 fees of token1 collected per unit of liquidity for the entire life of the pool /// @dev This value can overflow the uint256 function feeGrowthGlobal1X128() external view returns (uint256); /// @notice The amounts of token0 and token1 that are owed to the protocol /// @dev Protocol fees will never exceed uint128 max in either token function protocolFees() external view returns (uint128 token0, uint128 token1); /// @notice The currently in range liquidity available to the pool /// @dev This value has no relationship to the total liquidity across all ticks function liquidity() external view returns (uint128); /// @notice Look up information about a specific tick in the pool /// @param tick The tick to look up /// @return liquidityGross the total amount of position liquidity that uses the pool either as tick lower or /// tick upper, /// liquidityNet how much liquidity changes when the pool price crosses the tick, /// feeGrowthOutside0X128 the fee growth on the other side of the tick from the current tick in token0, /// feeGrowthOutside1X128 the fee growth on the other side of the tick from the current tick in token1, /// tickCumulativeOutside the cumulative tick value on the other side of the tick from the current tick /// secondsPerLiquidityOutsideX128 the seconds spent per liquidity on the other side of the tick from the current tick, /// secondsOutside the seconds spent on the other side of the tick from the current tick, /// initialized Set to true if the tick is initialized, i.e. liquidityGross is greater than 0, otherwise equal to false. /// Outside values can only be used if the tick is initialized, i.e. if liquidityGross is greater than 0. /// In addition, these values are only relative and must be used only in comparison to previous snapshots for /// a specific position. function ticks(int24 tick) external view returns ( uint128 liquidityGross, int128 liquidityNet, uint256 feeGrowthOutside0X128, uint256 feeGrowthOutside1X128, int56 tickCumulativeOutside, uint160 secondsPerLiquidityOutsideX128, uint32 secondsOutside, bool initialized ); /// @notice Returns 256 packed tick initialized boolean values. See TickBitmap for more information function tickBitmap(int16 wordPosition) external view returns (uint256); /// @notice Returns the information about a position by the position's key /// @param key The position's key is a hash of a preimage composed by the owner, tickLower and tickUpper /// @return _liquidity The amount of liquidity in the position, /// Returns feeGrowthInside0LastX128 fee growth of token0 inside the tick range as of the last mint/burn/poke, /// Returns feeGrowthInside1LastX128 fee growth of token1 inside the tick range as of the last mint/burn/poke, /// Returns tokensOwed0 the computed amount of token0 owed to the position as of the last mint/burn/poke, /// Returns tokensOwed1 the computed amount of token1 owed to the position as of the last mint/burn/poke function positions(bytes32 key) external view returns ( uint128 _liquidity, uint256 feeGrowthInside0LastX128, uint256 feeGrowthInside1LastX128, uint128 tokensOwed0, uint128 tokensOwed1 ); /// @notice Returns data about a specific observation index /// @param index The element of the observations array to fetch /// @dev You most likely want to use #observe() instead of this method to get an observation as of some amount of time /// ago, rather than at a specific index in the array. /// @return blockTimestamp The timestamp of the observation, /// Returns tickCumulative the tick multiplied by seconds elapsed for the life of the pool as of the observation timestamp, /// Returns secondsPerLiquidityCumulativeX128 the seconds per in range liquidity for the life of the pool as of the observation timestamp, /// Returns initialized whether the observation has been initialized and the values are safe to use function observations(uint256 index) external view returns ( uint32 blockTimestamp, int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128, bool initialized ); }
// SPDX-License-Identifier: MIT pragma solidity >=0.4.0; /// @title Contains 512-bit math functions /// @notice Facilitates multiplication and division that can have overflow of an intermediate value without any loss of precision /// @dev Handles "phantom overflow" i.e., allows multiplication and division where an intermediate value overflows 256 bits library FullMath { /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 /// @param a The multiplicand /// @param b The multiplier /// @param denominator The divisor /// @return result The 256-bit result /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv function mulDiv( uint256 a, uint256 b, uint256 denominator ) internal pure returns (uint256 result) { // 512-bit multiply [prod1 prod0] = a * b // Compute the product mod 2**256 and mod 2**256 - 1 // then use the Chinese Remainder Theorem to reconstruct // the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2**256 + prod0 uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(a, b, not(0)) prod0 := mul(a, b) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division if (prod1 == 0) { require(denominator > 0); assembly { result := div(prod0, denominator) } return result; } // Make sure the result is less than 2**256. // Also prevents denominator == 0 require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0] // Compute remainder using mulmod uint256 remainder; assembly { remainder := mulmod(a, b, denominator) } // Subtract 256 bit number from 512 bit number assembly { prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator // Compute largest power of two divisor of denominator. // Always >= 1. uint256 twos = -denominator & denominator; // Divide denominator by power of two assembly { denominator := div(denominator, twos) } // Divide [prod1 prod0] by the factors of two assembly { prod0 := div(prod0, twos) } // Shift in bits from prod1 into prod0. For this we need // to flip `twos` such that it is 2**256 / twos. // If twos is zero, then it becomes one assembly { twos := add(div(sub(0, twos), twos), 1) } prod0 |= prod1 * twos; // Invert denominator mod 2**256 // Now that denominator is an odd number, it has an inverse // modulo 2**256 such that denominator * inv = 1 mod 2**256. // Compute the inverse by starting with a seed that is correct // correct for four bits. That is, denominator * inv = 1 mod 2**4 uint256 inv = (3 * denominator) ^ 2; // Now use Newton-Raphson iteration to improve the precision. // Thanks to Hensel's lifting lemma, this also works in modular // arithmetic, doubling the correct bits in each step. inv *= 2 - denominator * inv; // inverse mod 2**8 inv *= 2 - denominator * inv; // inverse mod 2**16 inv *= 2 - denominator * inv; // inverse mod 2**32 inv *= 2 - denominator * inv; // inverse mod 2**64 inv *= 2 - denominator * inv; // inverse mod 2**128 inv *= 2 - denominator * inv; // inverse mod 2**256 // Because the division is now exact we can divide by multiplying // with the modular inverse of denominator. This will give us the // correct result modulo 2**256. Since the precoditions guarantee // that the outcome is less than 2**256, this is the final result. // We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inv; return result; } /// @notice Calculates ceil(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 /// @param a The multiplicand /// @param b The multiplier /// @param denominator The divisor /// @return result The 256-bit result function mulDivRoundingUp( uint256 a, uint256 b, uint256 denominator ) internal pure returns (uint256 result) { result = mulDiv(a, b, denominator); if (mulmod(a, b, denominator) > 0) { require(result < type(uint256).max); result++; } } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.7.0; /// @title Optimized overflow and underflow safe math operations /// @notice Contains methods for doing math operations that revert on overflow or underflow for minimal gas cost library LowGasSafeMath { /// @notice Returns x + y, reverts if sum overflows uint256 /// @param x The augend /// @param y The addend /// @return z The sum of x and y function add(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x + y) >= x); } /// @notice Returns x - y, reverts if underflows /// @param x The minuend /// @param y The subtrahend /// @return z The difference of x and y function sub(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x - y) <= x); } /// @notice Returns x * y, reverts if overflows /// @param x The multiplicand /// @param y The multiplier /// @return z The product of x and y function mul(uint256 x, uint256 y) internal pure returns (uint256 z) { require(x == 0 || (z = x * y) / x == y); } /// @notice Returns x + y, reverts if overflows or underflows /// @param x The augend /// @param y The addend /// @return z The sum of x and y function add(int256 x, int256 y) internal pure returns (int256 z) { require((z = x + y) >= x == (y >= 0)); } /// @notice Returns x - y, reverts if overflows or underflows /// @param x The minuend /// @param y The subtrahend /// @return z The difference of x and y function sub(int256 x, int256 y) internal pure returns (int256 z) { require((z = x - y) <= x == (y >= 0)); } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Math library for computing sqrt prices from ticks and vice versa /// @notice Computes sqrt price for ticks of size 1.0001, i.e. sqrt(1.0001^tick) as fixed point Q64.96 numbers. Supports /// prices between 2**-128 and 2**128 library TickMath { /// @dev The minimum tick that may be passed to #getSqrtRatioAtTick computed from log base 1.0001 of 2**-128 int24 internal constant MIN_TICK = -887272; /// @dev The maximum tick that may be passed to #getSqrtRatioAtTick computed from log base 1.0001 of 2**128 int24 internal constant MAX_TICK = -MIN_TICK; /// @dev The minimum value that can be returned from #getSqrtRatioAtTick. Equivalent to getSqrtRatioAtTick(MIN_TICK) uint160 internal constant MIN_SQRT_RATIO = 4295128739; /// @dev The maximum value that can be returned from #getSqrtRatioAtTick. Equivalent to getSqrtRatioAtTick(MAX_TICK) uint160 internal constant MAX_SQRT_RATIO = 1461446703485210103287273052203988822378723970342; /// @notice Calculates sqrt(1.0001^tick) * 2^96 /// @dev Throws if |tick| > max tick /// @param tick The input tick for the above formula /// @return sqrtPriceX96 A Fixed point Q64.96 number representing the sqrt of the ratio of the two assets (token1/token0) /// at the given tick function getSqrtRatioAtTick(int24 tick) internal pure returns (uint160 sqrtPriceX96) { uint256 absTick = tick < 0 ? uint256(-int256(tick)) : uint256(int256(tick)); require(absTick <= uint256(MAX_TICK), 'T'); uint256 ratio = absTick & 0x1 != 0 ? 0xfffcb933bd6fad37aa2d162d1a594001 : 0x100000000000000000000000000000000; if (absTick & 0x2 != 0) ratio = (ratio * 0xfff97272373d413259a46990580e213a) >> 128; if (absTick & 0x4 != 0) ratio = (ratio * 0xfff2e50f5f656932ef12357cf3c7fdcc) >> 128; if (absTick & 0x8 != 0) ratio = (ratio * 0xffe5caca7e10e4e61c3624eaa0941cd0) >> 128; if (absTick & 0x10 != 0) ratio = (ratio * 0xffcb9843d60f6159c9db58835c926644) >> 128; if (absTick & 0x20 != 0) ratio = (ratio * 0xff973b41fa98c081472e6896dfb254c0) >> 128; if (absTick & 0x40 != 0) ratio = (ratio * 0xff2ea16466c96a3843ec78b326b52861) >> 128; if (absTick & 0x80 != 0) ratio = (ratio * 0xfe5dee046a99a2a811c461f1969c3053) >> 128; if (absTick & 0x100 != 0) ratio = (ratio * 0xfcbe86c7900a88aedcffc83b479aa3a4) >> 128; if (absTick & 0x200 != 0) ratio = (ratio * 0xf987a7253ac413176f2b074cf7815e54) >> 128; if (absTick & 0x400 != 0) ratio = (ratio * 0xf3392b0822b70005940c7a398e4b70f3) >> 128; if (absTick & 0x800 != 0) ratio = (ratio * 0xe7159475a2c29b7443b29c7fa6e889d9) >> 128; if (absTick & 0x1000 != 0) ratio = (ratio * 0xd097f3bdfd2022b8845ad8f792aa5825) >> 128; if (absTick & 0x2000 != 0) ratio = (ratio * 0xa9f746462d870fdf8a65dc1f90e061e5) >> 128; if (absTick & 0x4000 != 0) ratio = (ratio * 0x70d869a156d2a1b890bb3df62baf32f7) >> 128; if (absTick & 0x8000 != 0) ratio = (ratio * 0x31be135f97d08fd981231505542fcfa6) >> 128; if (absTick & 0x10000 != 0) ratio = (ratio * 0x9aa508b5b7a84e1c677de54f3e99bc9) >> 128; if (absTick & 0x20000 != 0) ratio = (ratio * 0x5d6af8dedb81196699c329225ee604) >> 128; if (absTick & 0x40000 != 0) ratio = (ratio * 0x2216e584f5fa1ea926041bedfe98) >> 128; if (absTick & 0x80000 != 0) ratio = (ratio * 0x48a170391f7dc42444e8fa2) >> 128; if (tick > 0) ratio = type(uint256).max / ratio; // this divides by 1<<32 rounding up to go from a Q128.128 to a Q128.96. // we then downcast because we know the result always fits within 160 bits due to our tick input constraint // we round up in the division so getTickAtSqrtRatio of the output price is always consistent sqrtPriceX96 = uint160((ratio >> 32) + (ratio % (1 << 32) == 0 ? 0 : 1)); } /// @notice Calculates the greatest tick value such that getRatioAtTick(tick) <= ratio /// @dev Throws in case sqrtPriceX96 < MIN_SQRT_RATIO, as MIN_SQRT_RATIO is the lowest value getRatioAtTick may /// ever return. /// @param sqrtPriceX96 The sqrt ratio for which to compute the tick as a Q64.96 /// @return tick The greatest tick for which the ratio is less than or equal to the input ratio function getTickAtSqrtRatio(uint160 sqrtPriceX96) internal pure returns (int24 tick) { // second inequality must be < because the price can never reach the price at the max tick require(sqrtPriceX96 >= MIN_SQRT_RATIO && sqrtPriceX96 < MAX_SQRT_RATIO, 'R'); uint256 ratio = uint256(sqrtPriceX96) << 32; uint256 r = ratio; uint256 msb = 0; assembly { let f := shl(7, gt(r, 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(6, gt(r, 0xFFFFFFFFFFFFFFFF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(5, gt(r, 0xFFFFFFFF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(4, gt(r, 0xFFFF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(3, gt(r, 0xFF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(2, gt(r, 0xF)) msb := or(msb, f) r := shr(f, r) } assembly { let f := shl(1, gt(r, 0x3)) msb := or(msb, f) r := shr(f, r) } assembly { let f := gt(r, 0x1) msb := or(msb, f) } if (msb >= 128) r = ratio >> (msb - 127); else r = ratio << (127 - msb); int256 log_2 = (int256(msb) - 128) << 64; assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(63, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(62, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(61, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(60, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(59, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(58, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(57, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(56, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(55, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(54, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(53, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(52, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(51, f)) r := shr(f, r) } assembly { r := shr(127, mul(r, r)) let f := shr(128, r) log_2 := or(log_2, shl(50, f)) } int256 log_sqrt10001 = log_2 * 255738958999603826347141; // 128.128 number int24 tickLow = int24((log_sqrt10001 - 3402992956809132418596140100660247210) >> 128); int24 tickHi = int24((log_sqrt10001 + 291339464771989622907027621153398088495) >> 128); tick = tickLow == tickHi ? tickLow : getSqrtRatioAtTick(tickHi) <= sqrtPriceX96 ? tickHi : tickLow; } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0 <0.8.0; import '@uniswap/v3-core/contracts/libraries/FullMath.sol'; import '@uniswap/v3-core/contracts/libraries/TickMath.sol'; import '@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol'; import '@uniswap/v3-core/contracts/libraries/LowGasSafeMath.sol'; import '../libraries/PoolAddress.sol'; /// @title Oracle library /// @notice Provides functions to integrate with V3 pool oracle library OracleLibrary { /// @notice Fetches time-weighted average tick using Uniswap V3 oracle /// @param pool Address of Uniswap V3 pool that we want to observe /// @param period Number of seconds in the past to start calculating time-weighted average /// @return timeWeightedAverageTick The time-weighted average tick from (block.timestamp - period) to block.timestamp function consult(address pool, uint32 period) internal view returns (int24 timeWeightedAverageTick) { require(period != 0, 'BP'); uint32[] memory secondAgos = new uint32[](2); secondAgos[0] = period; secondAgos[1] = 0; (int56[] memory tickCumulatives, ) = IUniswapV3Pool(pool).observe(secondAgos); int56 tickCumulativesDelta = tickCumulatives[1] - tickCumulatives[0]; timeWeightedAverageTick = int24(tickCumulativesDelta / period); // Always round to negative infinity if (tickCumulativesDelta < 0 && (tickCumulativesDelta % period != 0)) timeWeightedAverageTick--; } /// @notice Given a tick and a token amount, calculates the amount of token received in exchange /// @param tick Tick value used to calculate the quote /// @param baseAmount Amount of token to be converted /// @param baseToken Address of an ERC20 token contract used as the baseAmount denomination /// @param quoteToken Address of an ERC20 token contract used as the quoteAmount denomination /// @return quoteAmount Amount of quoteToken received for baseAmount of baseToken function getQuoteAtTick( int24 tick, uint128 baseAmount, address baseToken, address quoteToken ) internal pure returns (uint256 quoteAmount) { uint160 sqrtRatioX96 = TickMath.getSqrtRatioAtTick(tick); // Calculate quoteAmount with better precision if it doesn't overflow when multiplied by itself if (sqrtRatioX96 <= type(uint128).max) { uint256 ratioX192 = uint256(sqrtRatioX96) * sqrtRatioX96; quoteAmount = baseToken < quoteToken ? FullMath.mulDiv(ratioX192, baseAmount, 1 << 192) : FullMath.mulDiv(1 << 192, baseAmount, ratioX192); } else { uint256 ratioX128 = FullMath.mulDiv(sqrtRatioX96, sqrtRatioX96, 1 << 64); quoteAmount = baseToken < quoteToken ? FullMath.mulDiv(ratioX128, baseAmount, 1 << 128) : FullMath.mulDiv(1 << 128, baseAmount, ratioX128); } } /// @notice Given a pool, it returns the number of seconds ago of the oldest stored observation /// @param pool Address of Uniswap V3 pool that we want to observe /// @return The number of seconds ago of the oldest observation stored for the pool function getOldestObservationSecondsAgo(address pool) internal view returns (uint32) { (, , uint16 observationIndex, uint16 observationCardinality, , , ) = IUniswapV3Pool(pool).slot0(); require(observationCardinality > 0, 'NI'); (uint32 observationTimestamp, , , bool initialized) = IUniswapV3Pool(pool).observations((observationIndex + 1) % observationCardinality); // The next index might not be initialized if the cardinality is in the process of increasing // In this case the oldest observation is always in index 0 if (!initialized) { (observationTimestamp, , , ) = IUniswapV3Pool(pool).observations(0); } return uint32(block.timestamp) - observationTimestamp; } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.5.0; /// @title Provides functions for deriving a pool address from the factory, tokens, and the fee library PoolAddress { bytes32 internal constant POOL_INIT_CODE_HASH = 0xe34f199b19b2b4f47f68442619d555527d244f78a3297ea89325f843f87b8b54; /// @notice The identifying key of the pool struct PoolKey { address token0; address token1; uint24 fee; } /// @notice Returns PoolKey: the ordered tokens with the matched fee levels /// @param tokenA The first token of a pool, unsorted /// @param tokenB The second token of a pool, unsorted /// @param fee The fee level of the pool /// @return Poolkey The pool details with ordered token0 and token1 assignments function getPoolKey( address tokenA, address tokenB, uint24 fee ) internal pure returns (PoolKey memory) { if (tokenA > tokenB) (tokenA, tokenB) = (tokenB, tokenA); return PoolKey({token0: tokenA, token1: tokenB, fee: fee}); } /// @notice Deterministically computes the pool address given the factory and PoolKey /// @param factory The Uniswap V3 factory contract address /// @param key The PoolKey /// @return pool The contract address of the V3 pool function computeAddress(address factory, PoolKey memory key) internal pure returns (address pool) { require(key.token0 < key.token1); pool = address( uint256( keccak256( abi.encodePacked( hex'ff', factory, keccak256(abi.encode(key.token0, key.token1, key.fee)), POOL_INIT_CODE_HASH ) ) ) ); } }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity >=0.7.6 <0.9.0; /// @title Common interface for Silo Price Providers interface IPriceProvider { /// @notice Returns "Time-Weighted Average Price" for an asset. Calculates TWAP price for quote/asset. /// It unifies all tokens decimal to 18, examples: /// - if asses == quote it returns 1e18 /// - if asset is USDC and quote is ETH and ETH costs ~$3300 then it returns ~0.0003e18 WETH per 1 USDC /// @param _asset address of an asset for which to read price /// @return price of asses with 18 decimals, throws when pool is not ready yet to provide price function getPrice(address _asset) external view returns (uint256 price); /// @dev Informs if PriceProvider is setup for asset. It does not means PriceProvider can provide price right away. /// Some providers implementations need time to "build" buffer for TWAP price, /// so price may not be available yet but this method will return true. /// @param _asset asset in question /// @return TRUE if asset has been setup, otherwise false function assetSupported(address _asset) external view returns (bool); /// @notice Gets token address in which prices are quoted /// @return quoteToken address function quoteToken() external view returns (address); /// @notice Helper method that allows easily detects, if contract is PriceProvider /// @dev this can save us from simple human errors, in case we use invalid address /// but this should NOT be treated as security check /// @return always true function priceProviderPing() external pure returns (bytes4); }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity >=0.7.6 <0.9.0; import "./IPriceProvider.sol"; interface IPriceProvidersRepository { /// @notice Emitted when price provider is added /// @param newPriceProvider new price provider address event NewPriceProvider(IPriceProvider indexed newPriceProvider); /// @notice Emitted when price provider is removed /// @param priceProvider removed price provider address event PriceProviderRemoved(IPriceProvider indexed priceProvider); /// @notice Emitted when asset is assigned to price provider /// @param asset assigned asset address /// @param priceProvider price provider address event PriceProviderForAsset(address indexed asset, IPriceProvider indexed priceProvider); /// @notice Register new price provider /// @param _priceProvider address of price provider function addPriceProvider(IPriceProvider _priceProvider) external; /// @notice Unregister price provider /// @param _priceProvider address of price provider to be removed function removePriceProvider(IPriceProvider _priceProvider) external; /// @notice Sets price provider for asset /// @dev Request for asset price is forwarded to the price provider assigned to that asset /// @param _asset address of an asset for which price provider will be used /// @param _priceProvider address of price provider function setPriceProviderForAsset(address _asset, IPriceProvider _priceProvider) external; /// @notice Returns "Time-Weighted Average Price" for an asset /// @param _asset address of an asset for which to read price /// @return price TWAP price of a token with 18 decimals function getPrice(address _asset) external view returns (uint256 price); /// @notice Gets price provider assigned to an asset /// @param _asset address of an asset for which to get price provider /// @return priceProvider address of price provider function priceProviders(address _asset) external view returns (IPriceProvider priceProvider); /// @notice Gets token address in which prices are quoted /// @return quoteToken address function quoteToken() external view returns (address); /// @notice Gets manager role address /// @return manager role address function manager() external view returns (address); /// @notice Checks if providers are available for an asset /// @param _asset asset address to check /// @return returns TRUE if price feed is ready, otherwise false function providersReadyForAsset(address _asset) external view returns (bool); /// @notice Returns true if address is a registered price provider /// @param _provider address of price provider to be removed /// @return true if address is a registered price provider, otherwise false function isPriceProvider(IPriceProvider _provider) external view returns (bool); /// @notice Gets number of price providers registered /// @return number of price providers registered function providersCount() external view returns (uint256); /// @notice Gets an array of price providers /// @return array of price providers function providerList() external view returns (address[] memory); /// @notice Sanity check function /// @return returns always TRUE function priceProvidersRepositoryPing() external pure returns (bytes4); }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity >=0.7.6 <0.9.0; library Ping { function pong(function() external pure returns(bytes4) pingFunction) internal pure returns (bool) { return pingFunction.address != address(0) && pingFunction.selector == pingFunction(); } }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity 0.7.6; /// @dev This is only meant to be used by price providers, which use a different /// Solidity version than the rest of the codebase. This way de won't need to include /// an additional version of OpenZeppelin's library. interface IERC20Like { function decimals() external view returns (uint8); function balanceOf(address) external view returns(uint256); }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity >=0.7.6 <0.9.0; import "../lib/Ping.sol"; import "../interfaces/IPriceProvider.sol"; import "../interfaces/IPriceProvidersRepository.sol"; /// @title PriceProvider /// @notice Abstract PriceProvider contract, parent of all PriceProviders /// @dev Price provider is a contract that directly integrates with a price source, ie. a DEX or alternative system /// like Chainlink to calculate TWAP prices for assets. Each price provider should support a single price source /// and multiple assets. abstract contract PriceProvider is IPriceProvider { /// @notice PriceProvidersRepository address IPriceProvidersRepository public immutable priceProvidersRepository; /// @notice Token address which prices are quoted in. Must be the same as PriceProvidersRepository.quoteToken address public immutable override quoteToken; modifier onlyManager() { if (priceProvidersRepository.manager() != msg.sender) revert("OnlyManager"); _; } /// @param _priceProvidersRepository address of PriceProvidersRepository constructor(IPriceProvidersRepository _priceProvidersRepository) { if ( !Ping.pong(_priceProvidersRepository.priceProvidersRepositoryPing) ) { revert("InvalidPriceProviderRepository"); } priceProvidersRepository = _priceProvidersRepository; quoteToken = _priceProvidersRepository.quoteToken(); } /// @inheritdoc IPriceProvider function priceProviderPing() external pure override returns (bytes4) { return this.priceProviderPing.selector; } function _revertBytes(bytes memory _errMsg, string memory _customErr) internal pure { if (_errMsg.length > 0) { assembly { // solhint-disable-line no-inline-assembly revert(add(32, _errMsg), mload(_errMsg)) } } revert(_customErr); } }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity >=0.7.6 <0.9.0; /// @title TwoStepOwnable /// @notice Contract that implements the same functionality as popular Ownable contract from openzeppelin library. /// The only difference is that it adds a possibility to transfer ownership in two steps. Single step ownership /// transfer is still supported. /// @dev Two step ownership transfer is meant to be used by humans to avoid human error. Single step ownership /// transfer is meant to be used by smart contracts to avoid over-complicated two step integration. For that reason, /// both ways are supported. abstract contract TwoStepOwnable { /// @dev current owner address private _owner; /// @dev candidate to an owner address private _pendingOwner; /// @notice Emitted when ownership is transferred on `transferOwnership` and `acceptOwnership` /// @param newOwner new owner event OwnershipTransferred(address indexed newOwner); /// @notice Emitted when ownership transfer is proposed, aka pending owner is set /// @param newPendingOwner new proposed/pending owner event OwnershipPending(address indexed newPendingOwner); /** * error OnlyOwner(); * error OnlyPendingOwner(); * error OwnerIsZero(); */ /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { if (owner() != msg.sender) revert("OnlyOwner"); _; } /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _setOwner(msg.sender); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { if (newOwner == address(0)) revert("OwnerIsZero"); _setOwner(newOwner); } /** * @dev Transfers pending ownership of the contract to a new account (`newPendingOwner`) and clears any existing * pending ownership. * Can only be called by the current owner. */ function transferPendingOwnership(address newPendingOwner) public virtual onlyOwner { _setPendingOwner(newPendingOwner); } /** * @dev Clears the pending ownership. * Can only be called by the current owner. */ function removePendingOwnership() public virtual onlyOwner { _setPendingOwner(address(0)); } /** * @dev Transfers ownership of the contract to a pending owner * Can only be called by the pending owner. */ function acceptOwnership() public virtual { if (msg.sender != pendingOwner()) revert("OnlyPendingOwner"); _setOwner(pendingOwner()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Returns the address of the pending owner. */ function pendingOwner() public view virtual returns (address) { return _pendingOwner; } /** * @dev Sets the new owner and emits the corresponding event. */ function _setOwner(address newOwner) private { if (_owner == newOwner) revert("OwnerDidNotChange"); _owner = newOwner; emit OwnershipTransferred(newOwner); if (_pendingOwner != address(0)) { _setPendingOwner(address(0)); } } /** * @dev Sets the new pending owner and emits the corresponding event. */ function _setPendingOwner(address newPendingOwner) private { if (_pendingOwner == newPendingOwner) revert("PendingOwnerDidNotChange"); _pendingOwner = newPendingOwner; emit OwnershipPending(newPendingOwner); } }
{ "evmVersion": "istanbul", "libraries": {}, "metadata": { "bytecodeHash": "ipfs", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 200 }, "remappings": [], "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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IUniswapV3Pool","name":"pool","type":"address"}],"name":"PoolForAsset","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IUniswapV3Pool","name":"_pool","type":"address"}],"name":"adjustOracleCardinality","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"assetOldestTimestamp","outputs":[{"internalType":"uint32","name":"oldestTimestamp","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"assetSupported","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"_blockTime","type":"uint8"}],"name":"changeBlockTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_period","type":"uint32"}],"name":"changePeriodForAvgPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getPrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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IUniswapV3Pool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceCalculationData","outputs":[{"internalType":"uint32","name":"periodForAvgPrice","type":"uint32"},{"internalType":"uint8","name":"blockTime","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceProviderPing","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"priceProvidersRepository","outputs":[{"internalType":"contract IPriceProvidersRepository","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IUniswapV3Pool","name":"_pool","type":"address"}],"name":"quotePrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"quoteToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"removePendingOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract 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IUniswapV3Pool","name":"_pool","type":"address"}],"name":"setupAsset","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newPendingOwner","type":"address"}],"name":"transferPendingOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniswapV3Factory","outputs":[{"internalType":"contract IUniswapV3Factory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"contract IUniswapV3Pool","name":"_pool","type":"address"}],"name":"verifyPool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000007c2ca9d502f2409beceafa68e97a176ff805029f0000000000000000000000001f98431c8ad98523631ae4a59f267346ea31f9840000000000000000000000000000000000000000000000000000000000000708000000000000000000000000000000000000000000000000000000000000000a
-----Decoded View---------------
Arg [0] : _priceProvidersRepository (address): 0x7C2ca9D502f2409BeceAfa68E97a176Ff805029F
Arg [1] : _factory (address): 0x1F98431c8aD98523631AE4a59f267346ea31F984
Arg [2] : _priceCalculationData (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000007c2ca9d502f2409beceafa68e97a176ff805029f
Arg [1] : 0000000000000000000000001f98431c8ad98523631ae4a59f267346ea31f984
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000708
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000a
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.