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0x6f40ACC62F15eA50a67dd5183cC3Cd7Aa4257830

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0 ETH

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0x611b9f6154871792024-03-14 23:17:1296 days ago1710458232IN
 Create: ExchangeSettlementLib
0 ETH0.000221750.14036081

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Contract Source Code Verified (Exact Match)

Contract Name:
ExchangeSettlementLib

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2024-03-15
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: ExchangeSettlementLib.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/ExchangeSettlementLib.sol
* Docs: https://docs.synthetix.io/contracts/ExchangeSettlementLib
*
* Contract Dependencies: (none)
* Libraries: 
*	- ExchangeSettlementLib
*	- SafeDecimalMath
*	- SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2024 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity >=0.4.24;

// https://docs.synthetix.io/contracts/source/interfaces/isynth
interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}


interface IVirtualSynth {
    // Views
    function balanceOfUnderlying(address account) external view returns (uint);

    function rate() external view returns (uint);

    function readyToSettle() external view returns (bool);

    function secsLeftInWaitingPeriod() external view returns (uint);

    function settled() external view returns (bool);

    function synth() external view returns (ISynth);

    // Mutative functions
    function settle(address account) external;
}


pragma experimental ABIEncoderV2;


// https://docs.synthetix.io/contracts/source/interfaces/iexchanger
interface IExchanger {
    struct ExchangeEntrySettlement {
        bytes32 src;
        uint amount;
        bytes32 dest;
        uint reclaim;
        uint rebate;
        uint srcRoundIdAtPeriodEnd;
        uint destRoundIdAtPeriodEnd;
        uint timestamp;
    }

    struct ExchangeEntry {
        uint sourceRate;
        uint destinationRate;
        uint destinationAmount;
        uint exchangeFeeRate;
        uint exchangeDynamicFeeRate;
        uint roundIdForSrc;
        uint roundIdForDest;
        uint sourceAmountAfterSettlement;
    }

    // Views
    function calculateAmountAfterSettlement(
        address from,
        bytes32 currencyKey,
        uint amount,
        uint refunded
    ) external view returns (uint amountAfterSettlement);

    function isSynthRateInvalid(bytes32 currencyKey) external view returns (bool);

    function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) external view returns (uint);

    function settlementOwing(address account, bytes32 currencyKey)
        external
        view
        returns (
            uint reclaimAmount,
            uint rebateAmount,
            uint numEntries
        );

    function hasWaitingPeriodOrSettlementOwing(address account, bytes32 currencyKey) external view returns (bool);

    function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint);

    function dynamicFeeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey)
        external
        view
        returns (uint feeRate, bool tooVolatile);

    function getAmountsForExchange(
        uint sourceAmount,
        bytes32 sourceCurrencyKey,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint amountReceived,
            uint fee,
            uint exchangeFeeRate
        );

    function priceDeviationThresholdFactor() external view returns (uint);

    function waitingPeriodSecs() external view returns (uint);

    function lastExchangeRate(bytes32 currencyKey) external view returns (uint);

    // Mutative functions
    function exchange(
        address exchangeForAddress,
        address from,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address destinationAddress,
        bool virtualSynth,
        address rewardAddress,
        bytes32 trackingCode
    ) external returns (uint amountReceived, IVirtualSynth vSynth);

    function exchangeAtomically(
        address from,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address destinationAddress,
        bytes32 trackingCode,
        uint minAmount
    ) external returns (uint amountReceived);

    function settle(address from, bytes32 currencyKey)
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntries
        );
}

// Used to have strongly-typed access to internal mutative functions in Synthetix
interface ISynthetixInternal {
    function emitExchangeTracking(
        bytes32 trackingCode,
        bytes32 toCurrencyKey,
        uint256 toAmount,
        uint256 fee
    ) external;

    function emitSynthExchange(
        address account,
        bytes32 fromCurrencyKey,
        uint fromAmount,
        bytes32 toCurrencyKey,
        uint toAmount,
        address toAddress
    ) external;

    function emitAtomicSynthExchange(
        address account,
        bytes32 fromCurrencyKey,
        uint fromAmount,
        bytes32 toCurrencyKey,
        uint toAmount,
        address toAddress
    ) external;

    function emitExchangeReclaim(
        address account,
        bytes32 currencyKey,
        uint amount
    ) external;

    function emitExchangeRebate(
        address account,
        bytes32 currencyKey,
        uint amount
    ) external;
}

interface IExchangerInternalDebtCache {
    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external;

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/ICircuitBreaker
interface ICircuitBreaker {
    // Views
    function isInvalid(address oracleAddress, uint value) external view returns (bool);

    function priceDeviationThresholdFactor() external view returns (uint);

    function isDeviationAboveThreshold(uint base, uint comparison) external view returns (bool);

    function lastValue(address oracleAddress) external view returns (uint);

    function circuitBroken(address oracleAddress) external view returns (bool);

    // Mutative functions
    function resetLastValue(address[] calldata oracleAddresses, uint[] calldata values) external;

    function probeCircuitBreaker(address oracleAddress, uint value) external returns (bool circuitBroken);
}


// https://docs.synthetix.io/contracts/source/interfaces/IDirectIntegration
interface IDirectIntegrationManager {
    struct ParameterIntegrationSettings {
        bytes32 currencyKey;
        address dexPriceAggregator;
        address atomicEquivalentForDexPricing;
        uint atomicExchangeFeeRate;
        uint atomicTwapWindow;
        uint atomicMaxVolumePerBlock;
        uint atomicVolatilityConsiderationWindow;
        uint atomicVolatilityUpdateThreshold;
        uint exchangeFeeRate;
        uint exchangeMaxDynamicFee;
        uint exchangeDynamicFeeRounds;
        uint exchangeDynamicFeeThreshold;
        uint exchangeDynamicFeeWeightDecay;
    }

    function getExchangeParameters(address integration, bytes32 key)
        external
        view
        returns (ParameterIntegrationSettings memory settings);

    function setExchangeParameters(
        address integration,
        bytes32[] calldata currencyKeys,
        ParameterIntegrationSettings calldata params
    ) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iexchangerates
interface IExchangeRates {
    // Structs
    struct RateAndUpdatedTime {
        uint216 rate;
        uint40 time;
    }

    // Views
    function aggregators(bytes32 currencyKey) external view returns (address);

    function aggregatorWarningFlags() external view returns (address);

    function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool);

    function anyRateIsInvalidAtRound(bytes32[] calldata currencyKeys, uint[] calldata roundIds) external view returns (bool);

    function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory);

    function effectiveValue(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external view returns (uint value);

    function effectiveValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveValueAndRatesAtRound(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        uint roundIdForSrc,
        uint roundIdForDest
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveAtomicValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint systemValue,
            uint systemSourceRate,
            uint systemDestinationRate
        );

    function effectiveAtomicValueAndRates(
        IDirectIntegrationManager.ParameterIntegrationSettings calldata sourceSettings,
        uint sourceAmount,
        IDirectIntegrationManager.ParameterIntegrationSettings calldata destinationSettings,
        IDirectIntegrationManager.ParameterIntegrationSettings calldata usdSettings
    )
        external
        view
        returns (
            uint value,
            uint systemValue,
            uint systemSourceRate,
            uint systemDestinationRate
        );

    function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);

    function getLastRoundIdBeforeElapsedSecs(
        bytes32 currencyKey,
        uint startingRoundId,
        uint startingTimestamp,
        uint timediff
    ) external view returns (uint);

    function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256);

    function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);

    function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time);

    function rateAndInvalid(bytes32 currencyKey) external view returns (uint rate, bool isInvalid);

    function rateForCurrency(bytes32 currencyKey) external view returns (uint);

    function rateIsFlagged(bytes32 currencyKey) external view returns (bool);

    function rateIsInvalid(bytes32 currencyKey) external view returns (bool);

    function rateIsStale(bytes32 currencyKey) external view returns (bool);

    function rateStalePeriod() external view returns (uint);

    function ratesAndUpdatedTimeForCurrencyLastNRounds(
        bytes32 currencyKey,
        uint numRounds,
        uint roundId
    ) external view returns (uint[] memory rates, uint[] memory times);

    function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory rates, bool anyRateInvalid);

    function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory);

    function synthTooVolatileForAtomicExchange(bytes32 currencyKey) external view returns (bool);

    function synthTooVolatileForAtomicExchange(IDirectIntegrationManager.ParameterIntegrationSettings calldata settings)
        external
        view
        returns (bool);

    function rateWithSafetyChecks(bytes32 currencyKey)
        external
        returns (
            uint rate,
            bool broken,
            bool invalid
        );
}


// https://docs.synthetix.io/contracts/source/interfaces/iexchangestate
interface IExchangeState {
    // Views
    struct ExchangeEntry {
        bytes32 src;
        uint amount;
        bytes32 dest;
        uint amountReceived;
        uint exchangeFeeRate;
        uint timestamp;
        uint roundIdForSrc;
        uint roundIdForDest;
    }

    function getLengthOfEntries(address account, bytes32 currencyKey) external view returns (uint);

    function getEntryAt(
        address account,
        bytes32 currencyKey,
        uint index
    )
        external
        view
        returns (
            bytes32 src,
            uint amount,
            bytes32 dest,
            uint amountReceived,
            uint exchangeFeeRate,
            uint timestamp,
            uint roundIdForSrc,
            uint roundIdForDest
        );

    function getMaxTimestamp(address account, bytes32 currencyKey) external view returns (uint);

    // Mutative functions
    function appendExchangeEntry(
        address account,
        bytes32 src,
        uint amount,
        bytes32 dest,
        uint amountReceived,
        uint exchangeFeeRate,
        uint timestamp,
        uint roundIdForSrc,
        uint roundIdForDest
    ) external;

    function removeEntries(address account, bytes32 currencyKey) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iissuer
interface IIssuer {
    // Views

    function allNetworksDebtInfo()
        external
        view
        returns (
            uint256 debt,
            uint256 sharesSupply,
            bool isStale
        );

    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function canBurnSynths(address account) external view returns (bool);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function collateralisationRatioAndAnyRatesInvalid(address _issuer)
        external
        view
        returns (uint cratio, bool anyRateIsInvalid);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance);

    function issuanceRatio() external view returns (uint);

    function lastIssueEvent(address account) external view returns (uint);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function minimumStakeTime() external view returns (uint);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey, bool excludeOtherCollateral) external view returns (uint);

    function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance)
        external
        view
        returns (uint transferable, bool anyRateIsInvalid);

    function liquidationAmounts(address account, bool isSelfLiquidation)
        external
        view
        returns (
            uint totalRedeemed,
            uint debtToRemove,
            uint escrowToLiquidate,
            uint initialDebtBalance
        );

    // Restricted: used internally to Synthetix
    function addSynths(ISynth[] calldata synthsToAdd) external;

    function issueSynths(address from, uint amount) external;

    function issueSynthsOnBehalf(
        address issueFor,
        address from,
        uint amount
    ) external;

    function issueMaxSynths(address from) external;

    function issueMaxSynthsOnBehalf(address issueFor, address from) external;

    function burnSynths(address from, uint amount) external;

    function burnSynthsOnBehalf(
        address burnForAddress,
        address from,
        uint amount
    ) external;

    function burnSynthsToTarget(address from) external;

    function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;

    function burnForRedemption(
        address deprecatedSynthProxy,
        address account,
        uint balance
    ) external;

    function setCurrentPeriodId(uint128 periodId) external;

    function liquidateAccount(address account, bool isSelfLiquidation)
        external
        returns (
            uint totalRedeemed,
            uint debtRemoved,
            uint escrowToLiquidate
        );

    function issueSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);

    function burnSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);

    function modifyDebtSharesForMigration(address account, uint amount) external;
}


interface IDebtCache {
    // Views

    function cachedDebt() external view returns (uint);

    function cachedSynthDebt(bytes32 currencyKey) external view returns (uint);

    function cacheTimestamp() external view returns (uint);

    function cacheInvalid() external view returns (bool);

    function cacheStale() external view returns (bool);

    function isInitialized() external view returns (bool);

    function currentSynthDebts(bytes32[] calldata currencyKeys)
        external
        view
        returns (
            uint[] memory debtValues,
            uint futuresDebt,
            uint excludedDebt,
            bool anyRateIsInvalid
        );

    function cachedSynthDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory debtValues);

    function totalNonSnxBackedDebt() external view returns (uint excludedDebt, bool isInvalid);

    function currentDebt() external view returns (uint debt, bool anyRateIsInvalid);

    function cacheInfo()
        external
        view
        returns (
            uint debt,
            uint timestamp,
            bool isInvalid,
            bool isStale
        );

    function excludedIssuedDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory excludedDebts);

    // Mutative functions

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external;

    function updateCachedSynthDebtWithRate(bytes32 currencyKey, uint currencyRate) external;

    function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external;

    function updateDebtCacheValidity(bool currentlyInvalid) external;

    function purgeCachedSynthDebt(bytes32 currencyKey) external;

    function takeDebtSnapshot() external;

    function recordExcludedDebtChange(bytes32 currencyKey, int256 delta) external;

    function updateCachedsUSDDebt(int amount) external;

    function importExcludedIssuedDebts(IDebtCache prevDebtCache, IIssuer prevIssuer) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/isynthetix
interface ISynthetix {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint);

    function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey) external view returns (uint);

    function totalIssuedSynthsExcludeOtherCollateral(bytes32 currencyKey) external view returns (uint);

    function transferableSynthetix(address account) external view returns (uint transferable);

    function getFirstNonZeroEscrowIndex(address account) external view returns (uint);

    // Mutative Functions
    function burnSynths(uint amount) external;

    function burnSynthsOnBehalf(address burnForAddress, uint amount) external;

    function burnSynthsToTarget() external;

    function burnSynthsToTargetOnBehalf(address burnForAddress) external;

    function exchange(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeOnBehalf(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeWithTracking(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address rewardAddress,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeWithTrackingForInitiator(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address rewardAddress,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeOnBehalfWithTracking(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address rewardAddress,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeWithVirtual(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        bytes32 trackingCode
    ) external returns (uint amountReceived, IVirtualSynth vSynth);

    function exchangeAtomically(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        bytes32 trackingCode,
        uint minAmount
    ) external returns (uint amountReceived);

    function issueMaxSynths() external;

    function issueMaxSynthsOnBehalf(address issueForAddress) external;

    function issueSynths(uint amount) external;

    function issueSynthsOnBehalf(address issueForAddress, uint amount) external;

    function mint() external returns (bool);

    function settle(bytes32 currencyKey)
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntries
        );

    // Liquidations
    function liquidateDelinquentAccount(address account) external returns (bool);

    function liquidateDelinquentAccountEscrowIndex(address account, uint escrowStartIndex) external returns (bool);

    function liquidateSelf() external returns (bool);

    // Restricted Functions

    function mintSecondary(address account, uint amount) external;

    function mintSecondaryRewards(uint amount) external;

    function burnSecondary(address account, uint amount) external;

    function migrateAccountBalances(address account) external returns (uint totalEscrowRevoked, uint totalLiquidBalance);
}


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// Libraries


// https://docs.synthetix.io/contracts/source/libraries/safedecimalmath
library SafeDecimalMath {
    using SafeMath for uint;

    /* Number of decimal places in the representations. */
    uint8 public constant decimals = 18;
    uint8 public constant highPrecisionDecimals = 27;

    /* The number representing 1.0. */
    uint public constant UNIT = 10**uint(decimals);

    /* The number representing 1.0 for higher fidelity numbers. */
    uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
    uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);

    /**
     * @return Provides an interface to UNIT.
     */
    function unit() external pure returns (uint) {
        return UNIT;
    }

    /**
     * @return Provides an interface to PRECISE_UNIT.
     */
    function preciseUnit() external pure returns (uint) {
        return PRECISE_UNIT;
    }

    /**
     * @return The result of multiplying x and y, interpreting the operands as fixed-point
     * decimals.
     *
     * @dev A unit factor is divided out after the product of x and y is evaluated,
     * so that product must be less than 2**256. As this is an integer division,
     * the internal division always rounds down. This helps save on gas. Rounding
     * is more expensive on gas.
     */
    function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        return x.mul(y) / UNIT;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of the specified precision unit.
     *
     * @dev The operands should be in the form of a the specified unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function _multiplyDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a precise unit.
     *
     * @dev The operands should be in the precise unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a standard unit.
     *
     * @dev The operands should be in the standard unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is a high
     * precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and UNIT must be less than 2**256. As
     * this is an integer division, the result is always rounded down.
     * This helps save on gas. Rounding is more expensive on gas.
     */
    function divideDecimal(uint x, uint y) internal pure returns (uint) {
        /* Reintroduce the UNIT factor that will be divided out by y. */
        return x.mul(UNIT).div(y);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * decimal in the precision unit specified in the parameter.
     *
     * @dev y is divided after the product of x and the specified precision unit
     * is evaluated, so the product of x and the specified precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function _divideDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        uint resultTimesTen = x.mul(precisionUnit * 10).div(y);

        if (resultTimesTen % 10 >= 5) {
            resultTimesTen += 10;
        }

        return resultTimesTen / 10;
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * standard precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and the standard precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * high precision decimal.
     *
     * @dev y is divided after the product of x and the high precision unit
     * is evaluated, so the product of x and the high precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @dev Convert a standard decimal representation to a high precision one.
     */
    function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
        return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
    }

    /**
     * @dev Convert a high precision decimal to a standard decimal representation.
     */
    function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
        uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    // Computes `a - b`, setting the value to 0 if b > a.
    function floorsub(uint a, uint b) internal pure returns (uint) {
        return b >= a ? 0 : a - b;
    }

    /* ---------- Utilities ---------- */
    /*
     * Absolute value of the input, returned as a signed number.
     */
    function signedAbs(int x) internal pure returns (int) {
        return x < 0 ? -x : x;
    }

    /*
     * Absolute value of the input, returned as an unsigned number.
     */
    function abs(int x) internal pure returns (uint) {
        return uint(signedAbs(x));
    }
}


library ExchangeSettlementLib {
    using SafeMath for uint256;
    using SafeDecimalMath for uint256;

    struct ResolvedAddresses {
        IExchangeState exchangeState;
        IExchangeRates exchangeRates;
        ICircuitBreaker circuitBreaker;
        IExchangerInternalDebtCache debtCache;
        IIssuer issuer;
        ISynthetix synthetix;
    }

    bytes32 internal constant sUSD = "sUSD";

    function internalSettle(
        ResolvedAddresses calldata resolvedAddresses,
        address from,
        bytes32 currencyKey,
        bool updateCache,
        uint waitingPeriod
    )
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntriesSettled
        )
    {
        require(
            maxSecsLeftInWaitingPeriod(resolvedAddresses.exchangeState, from, currencyKey, waitingPeriod) == 0,
            "Cannot settle during waiting period"
        );

        (uint reclaimAmount, uint rebateAmount, uint entries, IExchanger.ExchangeEntrySettlement[] memory settlements) =
            _settlementOwing(resolvedAddresses, from, currencyKey, waitingPeriod);

        if (reclaimAmount > rebateAmount) {
            reclaimed = reclaimAmount.sub(rebateAmount);
            _reclaim(resolvedAddresses, from, currencyKey, reclaimed);
        } else if (rebateAmount > reclaimAmount) {
            refunded = rebateAmount.sub(reclaimAmount);
            _refund(resolvedAddresses, from, currencyKey, refunded);
        }

        // by checking a reclaim or refund we also check that the currency key is still a valid synth,
        // as the deviation check will return 0 if the synth has been removed.
        if (updateCache && (reclaimed > 0 || refunded > 0)) {
            bytes32[] memory key = new bytes32[](1);
            key[0] = currencyKey;
            resolvedAddresses.debtCache.updateCachedSynthDebts(key);
        }

        // emit settlement event for each settled exchange entry
        for (uint i = 0; i < settlements.length; i++) {
            emit ExchangeEntrySettled(
                from,
                settlements[i].src,
                settlements[i].amount,
                settlements[i].dest,
                settlements[i].reclaim,
                settlements[i].rebate,
                settlements[i].srcRoundIdAtPeriodEnd,
                settlements[i].destRoundIdAtPeriodEnd,
                settlements[i].timestamp
            );
        }

        numEntriesSettled = entries;

        // Now remove all entries, even if no reclaim and no rebate
        resolvedAddresses.exchangeState.removeEntries(from, currencyKey);
    }

    function maxSecsLeftInWaitingPeriod(
        IExchangeState exchangeState,
        address account,
        bytes32 currencyKey,
        uint waitingPeriod
    ) public view returns (uint) {
        return _secsLeftInWaitingPeriodForExchange(exchangeState.getMaxTimestamp(account, currencyKey), waitingPeriod);
    }

    function _secsLeftInWaitingPeriodForExchange(uint timestamp, uint waitingPeriod) internal view returns (uint) {
        if (timestamp == 0 || now >= timestamp.add(waitingPeriod)) {
            return 0;
        }

        return timestamp.add(waitingPeriod).sub(now);
    }

    function _reclaim(
        ResolvedAddresses memory resolvedAddresses,
        address from,
        bytes32 currencyKey,
        uint amount
    ) internal {
        // burn amount from user
        resolvedAddresses.issuer.synths(currencyKey).burn(from, amount);
        ISynthetixInternal(address(resolvedAddresses.synthetix)).emitExchangeReclaim(from, currencyKey, amount);
    }

    function _refund(
        ResolvedAddresses memory resolvedAddresses,
        address from,
        bytes32 currencyKey,
        uint amount
    ) internal {
        // issue amount to user
        resolvedAddresses.issuer.synths(currencyKey).issue(from, amount);
        ISynthetixInternal(address(resolvedAddresses.synthetix)).emitExchangeRebate(from, currencyKey, amount);
    }

    function hasWaitingPeriodOrSettlementOwing(
        ResolvedAddresses calldata resolvedAddresses,
        address account,
        bytes32 currencyKey,
        uint waitingPeriod
    ) external view returns (bool) {
        if (maxSecsLeftInWaitingPeriod(resolvedAddresses.exchangeState, account, currencyKey, waitingPeriod) != 0) {
            return true;
        }

        (uint reclaimAmount, , , ) = _settlementOwing(resolvedAddresses, account, currencyKey, waitingPeriod);

        return reclaimAmount > 0;
    }

    function settlementOwing(
        ResolvedAddresses calldata resolvedAddresses,
        address account,
        bytes32 currencyKey,
        uint waitingPeriod
    )
        external
        view
        returns (
            uint reclaimAmount,
            uint rebateAmount,
            uint numEntries,
            IExchanger.ExchangeEntrySettlement[] memory
        )
    {
        return _settlementOwing(resolvedAddresses, account, currencyKey, waitingPeriod);
    }

    // Internal function to aggregate each individual rebate and reclaim entry for a synth
    function _settlementOwing(
        ResolvedAddresses memory resolvedAddresses,
        address account,
        bytes32 currencyKey,
        uint waitingPeriod
    )
        internal
        view
        returns (
            uint reclaimAmount,
            uint rebateAmount,
            uint numEntries,
            IExchanger.ExchangeEntrySettlement[] memory
        )
    {
        // Need to sum up all reclaim and rebate amounts for the user and the currency key
        numEntries = resolvedAddresses.exchangeState.getLengthOfEntries(account, currencyKey);

        // For each unsettled exchange
        IExchanger.ExchangeEntrySettlement[] memory settlements = new IExchanger.ExchangeEntrySettlement[](numEntries);
        for (uint i = 0; i < numEntries; i++) {
            // fetch the entry from storage
            IExchangeState.ExchangeEntry memory exchangeEntry =
                _getExchangeEntry(resolvedAddresses.exchangeState, account, currencyKey, i);

            // determine the last round ids for src and dest pairs when period ended or latest if not over
            (uint srcRoundIdAtPeriodEnd, uint destRoundIdAtPeriodEnd) =
                _getRoundIdsAtPeriodEnd(resolvedAddresses.exchangeRates, exchangeEntry, waitingPeriod);

            // given these round ids, determine what effective value they should have received
            uint amountShouldHaveReceived;
            {
                (uint destinationAmount, , ) =
                    resolvedAddresses.exchangeRates.effectiveValueAndRatesAtRound(
                        exchangeEntry.src,
                        exchangeEntry.amount,
                        exchangeEntry.dest,
                        srcRoundIdAtPeriodEnd,
                        destRoundIdAtPeriodEnd
                    );

                // and deduct the fee from this amount using the exchangeFeeRate from storage
                amountShouldHaveReceived = _deductFeesFromAmount(destinationAmount, exchangeEntry.exchangeFeeRate);
            }

            // SIP-65 settlements where the amount at end of waiting period is beyond the threshold, then
            // settle with no reclaim or rebate
            bool sip65condition =
                resolvedAddresses.circuitBreaker.isDeviationAboveThreshold(
                    exchangeEntry.amountReceived,
                    amountShouldHaveReceived
                );

            uint reclaim;
            uint rebate;

            if (!sip65condition) {
                if (exchangeEntry.amountReceived > amountShouldHaveReceived) {
                    // if they received more than they should have, add to the reclaim tally
                    reclaim = exchangeEntry.amountReceived.sub(amountShouldHaveReceived);
                    reclaimAmount = reclaimAmount.add(reclaim);
                } else if (amountShouldHaveReceived > exchangeEntry.amountReceived) {
                    // if less, add to the rebate tally
                    rebate = amountShouldHaveReceived.sub(exchangeEntry.amountReceived);
                    rebateAmount = rebateAmount.add(rebate);
                }
            }

            settlements[i] = IExchanger.ExchangeEntrySettlement({
                src: exchangeEntry.src,
                amount: exchangeEntry.amount,
                dest: exchangeEntry.dest,
                reclaim: reclaim,
                rebate: rebate,
                srcRoundIdAtPeriodEnd: srcRoundIdAtPeriodEnd,
                destRoundIdAtPeriodEnd: destRoundIdAtPeriodEnd,
                timestamp: exchangeEntry.timestamp
            });
        }

        return (reclaimAmount, rebateAmount, numEntries, settlements);
    }

    function _getExchangeEntry(
        IExchangeState exchangeState,
        address account,
        bytes32 currencyKey,
        uint index
    ) internal view returns (IExchangeState.ExchangeEntry memory) {
        (
            bytes32 src,
            uint amount,
            bytes32 dest,
            uint amountReceived,
            uint exchangeFeeRate,
            uint timestamp,
            uint roundIdForSrc,
            uint roundIdForDest
        ) = exchangeState.getEntryAt(account, currencyKey, index);

        return
            IExchangeState.ExchangeEntry({
                src: src,
                amount: amount,
                dest: dest,
                amountReceived: amountReceived,
                exchangeFeeRate: exchangeFeeRate,
                timestamp: timestamp,
                roundIdForSrc: roundIdForSrc,
                roundIdForDest: roundIdForDest
            });
    }

    function _getRoundIdsAtPeriodEnd(
        IExchangeRates exRates,
        IExchangeState.ExchangeEntry memory exchangeEntry,
        uint waitingPeriod
    ) internal view returns (uint srcRoundIdAtPeriodEnd, uint destRoundIdAtPeriodEnd) {
        srcRoundIdAtPeriodEnd = exRates.getLastRoundIdBeforeElapsedSecs(
            exchangeEntry.src,
            exchangeEntry.roundIdForSrc,
            exchangeEntry.timestamp,
            waitingPeriod
        );
        destRoundIdAtPeriodEnd = exRates.getLastRoundIdBeforeElapsedSecs(
            exchangeEntry.dest,
            exchangeEntry.roundIdForDest,
            exchangeEntry.timestamp,
            waitingPeriod
        );
    }

    function _deductFeesFromAmount(uint destinationAmount, uint exchangeFeeRate)
        internal
        pure
        returns (uint amountReceived)
    {
        amountReceived = destinationAmount.multiplyDecimal(SafeDecimalMath.unit().sub(exchangeFeeRate));
    }

    function appendExchange(
        ResolvedAddresses calldata resolvedAddresses,
        address account,
        bytes32 src,
        uint amount,
        bytes32 dest,
        uint amountReceived,
        uint exchangeFeeRate
    ) external {
        uint roundIdForSrc = resolvedAddresses.exchangeRates.getCurrentRoundId(src);
        uint roundIdForDest = resolvedAddresses.exchangeRates.getCurrentRoundId(dest);
        resolvedAddresses.exchangeState.appendExchangeEntry(
            account,
            src,
            amount,
            dest,
            amountReceived,
            exchangeFeeRate,
            now,
            roundIdForSrc,
            roundIdForDest
        );

        emit ExchangeEntryAppended(
            account,
            src,
            amount,
            dest,
            amountReceived,
            exchangeFeeRate,
            roundIdForSrc,
            roundIdForDest
        );
    }

    // ========== EVENTS ==========
    event ExchangeEntryAppended(
        address indexed account,
        bytes32 src,
        uint256 amount,
        bytes32 dest,
        uint256 amountReceived,
        uint256 exchangeFeeRate,
        uint256 roundIdForSrc,
        uint256 roundIdForDest
    );

    event ExchangeEntrySettled(
        address indexed from,
        bytes32 src,
        uint256 amount,
        bytes32 dest,
        uint256 reclaim,
        uint256 rebate,
        uint256 srcRoundIdAtPeriodEnd,
        uint256 destRoundIdAtPeriodEnd,
        uint256 exchangeTimestamp
    );
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bytes32","name":"src","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"dest","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amountReceived","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"exchangeFeeRate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundIdForSrc","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundIdForDest","type":"uint256"}],"name":"ExchangeEntryAppended","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"bytes32","name":"src","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"dest","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"reclaim","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rebate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"srcRoundIdAtPeriodEnd","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"destRoundIdAtPeriodEnd","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"exchangeTimestamp","type":"uint256"}],"name":"ExchangeEntrySettled","type":"event"},{"constant":true,"inputs":[{"components":[{"internalType":"contract IExchangeState","name":"exchangeState","type":"IExchangeState"},{"internalType":"contract IExchangeRates","name":"exchangeRates","type":"IExchangeRates"},{"internalType":"contract ICircuitBreaker","name":"circuitBreaker","type":"ICircuitBreaker"},{"internalType":"contract IExchangerInternalDebtCache","name":"debtCache","type":"IExchangerInternalDebtCache"},{"internalType":"contract IIssuer","name":"issuer","type":"IIssuer"},{"internalType":"contract ISynthetix","name":"synthetix","type":"ISynthetix"}],"internalType":"struct ExchangeSettlementLib.ResolvedAddresses","name":"resolvedAddresses","type":"tuple"},{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"waitingPeriod","type":"uint256"}],"name":"hasWaitingPeriodOrSettlementOwing","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IExchangeState","name":"exchangeState","type":"IExchangeState"},{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"waitingPeriod","type":"uint256"}],"name":"maxSecsLeftInWaitingPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"components":[{"internalType":"contract IExchangeState","name":"exchangeState","type":"IExchangeState"},{"internalType":"contract IExchangeRates","name":"exchangeRates","type":"IExchangeRates"},{"internalType":"contract ICircuitBreaker","name":"circuitBreaker","type":"ICircuitBreaker"},{"internalType":"contract IExchangerInternalDebtCache","name":"debtCache","type":"IExchangerInternalDebtCache"},{"internalType":"contract IIssuer","name":"issuer","type":"IIssuer"},{"internalType":"contract ISynthetix","name":"synthetix","type":"ISynthetix"}],"internalType":"struct ExchangeSettlementLib.ResolvedAddresses","name":"resolvedAddresses","type":"tuple"},{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"waitingPeriod","type":"uint256"}],"name":"settlementOwing","outputs":[{"internalType":"uint256","name":"reclaimAmount","type":"uint256"},{"internalType":"uint256","name":"rebateAmount","type":"uint256"},{"internalType":"uint256","name":"numEntries","type":"uint256"},{"components":[{"internalType":"bytes32","name":"src","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32","name":"dest","type":"bytes32"},{"internalType":"uint256","name":"reclaim","type":"uint256"},{"internalType":"uint256","name":"rebate","type":"uint256"},{"internalType":"uint256","name":"srcRoundIdAtPeriodEnd","type":"uint256"},{"internalType":"uint256","name":"destRoundIdAtPeriodEnd","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"internalType":"struct IExchanger.ExchangeEntrySettlement[]","name":"","type":"tuple[]"}],"payable":false,"stateMutability":"view","type":"function"}]

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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.