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Contract Source Code Verified (Exact Match)

Contract Name:
Orders

Compiler Version
v0.7.5+commit.eb77ed08

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
File 1 of 11 : Orders.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;

import 'SafeMath.sol';
import 'Math.sol';
import 'IIntegralFactory.sol';
import 'IIntegralPair.sol';
import 'TokenShares.sol';

library Orders {
    using SafeMath for uint256;
    using TokenShares for TokenShares.Data;
    using TransferHelper for address;

    enum OrderType { Empty, Deposit, Withdraw, Sell, Buy }
    enum OrderStatus { NonExistent, EnqueuedWaiting, EnqueuedReady, ExecutedSucceeded, ExecutedFailed, Canceled }

    event MaxGasLimitSet(uint256 maxGasLimit);
    event GasPriceInertiaSet(uint256 gasPriceInertia);
    event MaxGasPriceImpactSet(uint256 maxGasPriceImpact);
    event TransferGasCostSet(address token, uint256 gasCost);

    event DepositEnqueued(uint256 indexed orderId, uint128 validAfterTimestamp, uint256 gasPrice);
    event WithdrawEnqueued(uint256 indexed orderId, uint128 validAfterTimestamp, uint256 gasPrice);
    event SellEnqueued(uint256 indexed orderId, uint128 validAfterTimestamp, uint256 gasPrice);
    event BuyEnqueued(uint256 indexed orderId, uint128 validAfterTimestamp, uint256 gasPrice);

    uint8 private constant DEPOSIT_TYPE = 1;
    uint8 private constant WITHDRAW_TYPE = 2;
    uint8 private constant BUY_TYPE = 3;
    uint8 private constant BUY_INVERTED_TYPE = 4;
    uint8 private constant SELL_TYPE = 5;
    uint8 private constant SELL_INVERTED_TYPE = 6;

    uint8 private constant UNWRAP_NOT_FAILED = 0;
    uint8 private constant KEEP_NOT_FAILED = 1;
    uint8 private constant UNWRAP_FAILED = 2;
    uint8 private constant KEEP_FAILED = 3;

    uint256 private constant ETHER_TRANSFER_COST = 2300;
    uint256 private constant BUFFER_COST = 10000;
    uint256 private constant EXECUTE_PREPARATION_COST = 55000; // dequeue + getPair in execute

    uint256 public constant ETHER_TRANSFER_CALL_COST = 10000;
    uint256 public constant PAIR_TRANSFER_COST = 55000;
    uint256 public constant REFUND_END_COST = 2 * ETHER_TRANSFER_COST + BUFFER_COST;
    uint256 public constant ORDER_BASE_COST = EXECUTE_PREPARATION_COST + REFUND_END_COST;

    uint256 private constant TIMESTAMP_OFFSET = 1609455600; // 2021 Jan 1

    struct PairInfo {
        address pair;
        address token0;
        address token1;
    }

    struct Data {
        uint256 delay;
        uint256 newestOrderId;
        uint256 lastProcessedOrderId;
        mapping(uint256 => StoredOrder) orderQueue;
        address factory;
        uint256 maxGasLimit;
        uint256 gasPrice;
        uint256 gasPriceInertia;
        uint256 maxGasPriceImpact;
        mapping(uint32 => PairInfo) pairs;
        mapping(address => uint256) transferGasCosts;
        mapping(uint256 => bool) canceled;
        mapping(address => bool) depositDisabled;
        mapping(address => bool) withdrawDisabled;
        mapping(address => bool) buyDisabled;
        mapping(address => bool) sellDisabled;
    }

    struct StoredOrder {
        // slot 1
        uint8 orderType;
        uint32 validAfterTimestamp;
        uint8 unwrapAndFailure;
        uint32 deadline;
        uint32 gasLimit;
        uint32 gasPrice;
        uint112 liquidityOrRatio;
        // slot 1
        uint112 value0;
        uint112 value1;
        uint32 pairId;
        // slot2
        address to;
        uint32 minRatioChangeToSwap;
        uint32 minSwapPrice;
        uint32 maxSwapPrice;
    }

    struct DepositOrder {
        uint32 pairId;
        uint256 share0;
        uint256 share1;
        uint256 initialRatio;
        uint256 minRatioChangeToSwap;
        uint256 minSwapPrice;
        uint256 maxSwapPrice;
        bool unwrap;
        address to;
        uint256 gasPrice;
        uint256 gasLimit;
        uint256 deadline;
    }

    struct WithdrawOrder {
        uint32 pairId;
        uint256 liquidity;
        uint256 amount0Min;
        uint256 amount1Min;
        bool unwrap;
        address to;
        uint256 gasPrice;
        uint256 gasLimit;
        uint256 deadline;
    }

    struct SellOrder {
        uint32 pairId;
        bool inverse;
        uint256 shareIn;
        uint256 amountOutMin;
        bool unwrap;
        address to;
        uint256 gasPrice;
        uint256 gasLimit;
        uint256 deadline;
    }

    struct BuyOrder {
        uint32 pairId;
        bool inverse;
        uint256 shareInMax;
        uint256 amountOut;
        bool unwrap;
        address to;
        uint256 gasPrice;
        uint256 gasLimit;
        uint256 deadline;
    }

    function decodeType(uint256 internalType) internal pure returns (OrderType orderType) {
        if (internalType == DEPOSIT_TYPE) {
            orderType = OrderType.Deposit;
        } else if (internalType == WITHDRAW_TYPE) {
            orderType = OrderType.Withdraw;
        } else if (internalType == BUY_TYPE) {
            orderType = OrderType.Buy;
        } else if (internalType == BUY_INVERTED_TYPE) {
            orderType = OrderType.Buy;
        } else if (internalType == SELL_TYPE) {
            orderType = OrderType.Sell;
        } else if (internalType == SELL_INVERTED_TYPE) {
            orderType = OrderType.Sell;
        } else {
            orderType = OrderType.Empty;
        }
    }

    function getOrder(Data storage data, uint256 orderId)
        public
        view
        returns (OrderType orderType, uint256 validAfterTimestamp)
    {
        StoredOrder storage order = data.orderQueue[orderId];
        uint8 internalType = order.orderType;
        validAfterTimestamp = uint32ToTimestamp(order.validAfterTimestamp);
        orderType = decodeType(internalType);
    }

    function getOrderStatus(Data storage data, uint256 orderId) external view returns (OrderStatus orderStatus) {
        if (orderId > data.newestOrderId) {
            return OrderStatus.NonExistent;
        }
        if (data.canceled[orderId]) {
            return OrderStatus.Canceled;
        }
        if (isRefundFailed(data, orderId)) {
            return OrderStatus.ExecutedFailed;
        }
        (OrderType orderType, uint256 validAfterTimestamp) = getOrder(data, orderId);
        if (orderType == OrderType.Empty) {
            return OrderStatus.ExecutedSucceeded;
        }
        if (validAfterTimestamp >= block.timestamp) {
            return OrderStatus.EnqueuedWaiting;
        }
        return OrderStatus.EnqueuedReady;
    }

    function getPair(
        Data storage data,
        address tokenA,
        address tokenB
    )
        internal
        returns (
            address pair,
            uint32 pairId,
            bool inverted
        )
    {
        inverted = tokenA > tokenB;
        (address token0, address token1) = inverted ? (tokenB, tokenA) : (tokenA, tokenB);
        pair = IIntegralFactory(data.factory).getPair(token0, token1);
        pairId = uint32(bytes4(keccak256(abi.encodePacked((pair)))));
        require(pair != address(0), 'OS_PAIR_NONEXISTENT');
        if (data.pairs[pairId].pair == address(0)) {
            data.pairs[pairId] = PairInfo(pair, token0, token1);
        }
    }

    function getPairInfo(Data storage data, uint32 pairId)
        external
        view
        returns (
            address pair,
            address token0,
            address token1
        )
    {
        PairInfo storage info = data.pairs[pairId];
        pair = info.pair;
        token0 = info.token0;
        token1 = info.token1;
    }

    function getDepositOrder(Data storage data, uint256 index) public view returns (DepositOrder memory order) {
        StoredOrder memory stored = data.orderQueue[index];
        require(stored.orderType == DEPOSIT_TYPE, 'OS_INVALID_ORDER_TYPE');
        order.pairId = stored.pairId;
        order.share0 = stored.value0;
        order.share1 = stored.value1;
        order.initialRatio = stored.liquidityOrRatio;
        order.minRatioChangeToSwap = stored.minRatioChangeToSwap;
        order.minSwapPrice = float32ToUint(stored.minSwapPrice);
        order.maxSwapPrice = float32ToUint(stored.maxSwapPrice);
        order.unwrap = getUnwrap(stored.unwrapAndFailure);
        order.to = stored.to;
        order.gasPrice = uint32ToGasPrice(stored.gasPrice);
        order.gasLimit = stored.gasLimit;
        order.deadline = uint32ToTimestamp(stored.deadline);
    }

    function getWithdrawOrder(Data storage data, uint256 index) public view returns (WithdrawOrder memory order) {
        StoredOrder memory stored = data.orderQueue[index];
        require(stored.orderType == WITHDRAW_TYPE, 'OS_INVALID_ORDER_TYPE');
        order.pairId = stored.pairId;
        order.liquidity = stored.liquidityOrRatio;
        order.amount0Min = stored.value0;
        order.amount1Min = stored.value1;
        order.unwrap = getUnwrap(stored.unwrapAndFailure);
        order.to = stored.to;
        order.gasPrice = uint32ToGasPrice(stored.gasPrice);
        order.gasLimit = stored.gasLimit;
        order.deadline = uint32ToTimestamp(stored.deadline);
    }

    function getSellOrder(Data storage data, uint256 index) public view returns (SellOrder memory order) {
        StoredOrder memory stored = data.orderQueue[index];
        require(stored.orderType == SELL_TYPE || stored.orderType == SELL_INVERTED_TYPE, 'OS_INVALID_ORDER_TYPE');
        order.pairId = stored.pairId;
        order.inverse = stored.orderType == SELL_INVERTED_TYPE;
        order.shareIn = stored.value0;
        order.amountOutMin = stored.value1;
        order.unwrap = getUnwrap(stored.unwrapAndFailure);
        order.to = stored.to;
        order.gasPrice = uint32ToGasPrice(stored.gasPrice);
        order.gasLimit = stored.gasLimit;
        order.deadline = uint32ToTimestamp(stored.deadline);
    }

    function getBuyOrder(Data storage data, uint256 index) public view returns (BuyOrder memory order) {
        StoredOrder memory stored = data.orderQueue[index];
        require(stored.orderType == BUY_TYPE || stored.orderType == BUY_INVERTED_TYPE, 'OS_INVALID_ORDER_TYPE');
        order.pairId = stored.pairId;
        order.inverse = stored.orderType == BUY_INVERTED_TYPE;
        order.shareInMax = stored.value0;
        order.amountOut = stored.value1;
        order.unwrap = getUnwrap(stored.unwrapAndFailure);
        order.to = stored.to;
        order.gasPrice = uint32ToGasPrice(stored.gasPrice);
        order.gasLimit = stored.gasLimit;
        order.deadline = uint32ToTimestamp(stored.deadline);
    }

    function getFailedOrderType(Data storage data, uint256 orderId)
        external
        view
        returns (OrderType orderType, uint256 validAfterTimestamp)
    {
        require(isRefundFailed(data, orderId), 'OS_NO_POSSIBLE_REFUND');
        (orderType, validAfterTimestamp) = getOrder(data, orderId);
    }

    function getUnwrap(uint8 unwrapAndFailure) private pure returns (bool) {
        return unwrapAndFailure == UNWRAP_FAILED || unwrapAndFailure == UNWRAP_NOT_FAILED;
    }

    function getUnwrapAndFailure(bool unwrap) private pure returns (uint8) {
        return unwrap ? UNWRAP_NOT_FAILED : KEEP_NOT_FAILED;
    }

    function timestampToUint32(uint256 timestamp) private pure returns (uint32 timestamp32) {
        if (timestamp == uint256(-1)) {
            return uint32(-1);
        }
        timestamp32 = uintToUint32(timestamp.sub(TIMESTAMP_OFFSET));
    }

    function uint32ToTimestamp(uint32 timestamp32) private pure returns (uint256 timestamp) {
        if (timestamp32 == uint32(-1)) {
            return uint256(-1);
        }
        if (timestamp32 == 0) {
            return 0;
        }
        timestamp = uint256(timestamp32) + TIMESTAMP_OFFSET;
    }

    function gasPriceToUint32(uint256 gasPrice) private pure returns (uint32 gasPrice32) {
        require((gasPrice / 1e6) * 1e6 == gasPrice, 'OS_GAS_PRICE_PRECISION');
        gasPrice32 = uintToUint32(gasPrice / 1e6);
    }

    function uint32ToGasPrice(uint32 gasPrice32) public pure returns (uint256 gasPrice) {
        gasPrice = uint256(gasPrice32) * 1e6;
    }

    function uintToUint32(uint256 number) private pure returns (uint32 number32) {
        number32 = uint32(number);
        require(uint256(number32) == number, 'OS_OVERFLOW_32');
    }

    function uintToUint112(uint256 number) private pure returns (uint112 number112) {
        number112 = uint112(number);
        require(uint256(number112) == number, 'OS_OVERFLOW_112');
    }

    function uintToFloat32(uint256 number) internal pure returns (uint32 float32) {
        // Number is encoded on 4 bytes. 3 bytes for mantissa and 1 for exponent.
        // If the number fits in the mantissa we set the exponent to zero and return.
        if (number < 2 << 24) {
            return uint32(number << 8);
        }
        // We find the exponent by counting the number of trailing zeroes.
        // Simultaneously we remove those zeroes from the number.
        uint32 exponent;
        for (exponent = 0; exponent < 256 - 24; exponent++) {
            // Last bit is one.
            if (number & 1 == 1) {
                break;
            }
            number = number >> 1;
        }
        // The number must fit in the mantissa.
        require(number < 2 << 24, 'OS_OVERFLOW_FLOAT_ENCODE');
        // Set the first three bytes to the number and the fourth to the exponent.
        float32 = uint32(number << 8) | exponent;
    }

    function float32ToUint(uint32 float32) internal pure returns (uint256 number) {
        // Number is encoded on 4 bytes. 3 bytes for mantissa and 1 for exponent.
        // We get the exponent by extracting the last byte.
        uint256 exponent = float32 & 0xFF;
        // Sanity check. Only triggered for values not encoded with uintToFloat32.
        require(exponent <= 256 - 24, 'OS_OVERFLOW_FLOAT_DECODE');
        // We get the mantissa by extracting the first three bytes and removing the fourth.
        uint256 mantissa = (float32 & 0xFFFFFF00) >> 8;
        // We add exponent number zeroes after the mantissa.
        number = mantissa << exponent;
    }

    function enqueueDepositOrder(Data storage data, DepositOrder memory depositOrder) internal {
        data.newestOrderId++;
        uint128 validAfterTimestamp = uint128(block.timestamp + data.delay);
        emit DepositEnqueued(data.newestOrderId, validAfterTimestamp, depositOrder.gasPrice);
        data.orderQueue[data.newestOrderId] = StoredOrder(
            DEPOSIT_TYPE,
            timestampToUint32(validAfterTimestamp),
            getUnwrapAndFailure(depositOrder.unwrap),
            timestampToUint32(depositOrder.deadline),
            uintToUint32(depositOrder.gasLimit),
            gasPriceToUint32(depositOrder.gasPrice),
            uintToUint112(depositOrder.initialRatio),
            uintToUint112(depositOrder.share0),
            uintToUint112(depositOrder.share1),
            depositOrder.pairId,
            depositOrder.to,
            uint32(depositOrder.minRatioChangeToSwap),
            uintToFloat32(depositOrder.minSwapPrice),
            uintToFloat32(depositOrder.maxSwapPrice)
        );
    }

    function enqueueWithdrawOrder(Data storage data, WithdrawOrder memory withdrawOrder) internal {
        data.newestOrderId++;
        uint128 validAfterTimestamp = uint128(block.timestamp + data.delay);
        emit WithdrawEnqueued(data.newestOrderId, validAfterTimestamp, withdrawOrder.gasPrice);
        data.orderQueue[data.newestOrderId] = StoredOrder(
            WITHDRAW_TYPE,
            timestampToUint32(validAfterTimestamp),
            getUnwrapAndFailure(withdrawOrder.unwrap),
            timestampToUint32(withdrawOrder.deadline),
            uintToUint32(withdrawOrder.gasLimit),
            gasPriceToUint32(withdrawOrder.gasPrice),
            uintToUint112(withdrawOrder.liquidity),
            uintToUint112(withdrawOrder.amount0Min),
            uintToUint112(withdrawOrder.amount1Min),
            withdrawOrder.pairId,
            withdrawOrder.to,
            0, // maxRatioChange
            0, // minSwapPrice
            0 // maxSwapPrice
        );
    }

    function enqueueSellOrder(Data storage data, SellOrder memory sellOrder) internal {
        data.newestOrderId++;
        uint128 validAfterTimestamp = uint128(block.timestamp + data.delay);
        emit SellEnqueued(data.newestOrderId, validAfterTimestamp, sellOrder.gasPrice);
        data.orderQueue[data.newestOrderId] = StoredOrder(
            sellOrder.inverse ? SELL_INVERTED_TYPE : SELL_TYPE,
            timestampToUint32(validAfterTimestamp),
            getUnwrapAndFailure(sellOrder.unwrap),
            timestampToUint32(sellOrder.deadline),
            uintToUint32(sellOrder.gasLimit),
            gasPriceToUint32(sellOrder.gasPrice),
            0, // liquidityOrRatio
            uintToUint112(sellOrder.shareIn),
            uintToUint112(sellOrder.amountOutMin),
            sellOrder.pairId,
            sellOrder.to,
            0, // maxRatioChange
            0, // minSwapPrice
            0 // maxSwapPrice
        );
    }

    function enqueueBuyOrder(Data storage data, BuyOrder memory buyOrder) internal {
        data.newestOrderId++;
        uint128 validAfterTimestamp = uint128(block.timestamp + data.delay);
        emit BuyEnqueued(data.newestOrderId, validAfterTimestamp, buyOrder.gasPrice);
        data.orderQueue[data.newestOrderId] = StoredOrder(
            buyOrder.inverse ? BUY_INVERTED_TYPE : BUY_TYPE,
            timestampToUint32(validAfterTimestamp),
            getUnwrapAndFailure(buyOrder.unwrap),
            timestampToUint32(buyOrder.deadline),
            uintToUint32(buyOrder.gasLimit),
            gasPriceToUint32(buyOrder.gasPrice),
            0, // liquidityOrRatio
            uintToUint112(buyOrder.shareInMax),
            uintToUint112(buyOrder.amountOut),
            buyOrder.pairId,
            buyOrder.to,
            0, // maxRatioChange
            0, // minSwapPrice
            0 // maxSwapPrice
        );
    }

    function isRefundFailed(Data storage data, uint256 index) internal view returns (bool) {
        uint8 unwrapAndFailure = data.orderQueue[index].unwrapAndFailure;
        return unwrapAndFailure == UNWRAP_FAILED || unwrapAndFailure == KEEP_FAILED;
    }

    function markRefundFailed(Data storage data) internal {
        StoredOrder storage stored = data.orderQueue[data.lastProcessedOrderId];
        stored.unwrapAndFailure = stored.unwrapAndFailure == UNWRAP_NOT_FAILED ? UNWRAP_FAILED : KEEP_FAILED;
    }

    function getNextOrder(Data storage data) internal view returns (OrderType orderType, uint256 validAfterTimestamp) {
        return getOrder(data, data.lastProcessedOrderId + 1);
    }

    function dequeueCanceledOrder(Data storage data) external {
        data.lastProcessedOrderId++;
    }

    function dequeueDepositOrder(Data storage data) external returns (DepositOrder memory order) {
        data.lastProcessedOrderId++;
        order = getDepositOrder(data, data.lastProcessedOrderId);
    }

    function dequeueWithdrawOrder(Data storage data) external returns (WithdrawOrder memory order) {
        data.lastProcessedOrderId++;
        order = getWithdrawOrder(data, data.lastProcessedOrderId);
    }

    function dequeueSellOrder(Data storage data) external returns (SellOrder memory order) {
        data.lastProcessedOrderId++;
        order = getSellOrder(data, data.lastProcessedOrderId);
    }

    function dequeueBuyOrder(Data storage data) external returns (BuyOrder memory order) {
        data.lastProcessedOrderId++;
        order = getBuyOrder(data, data.lastProcessedOrderId);
    }

    function forgetOrder(Data storage data, uint256 orderId) internal {
        delete data.orderQueue[orderId];
    }

    function forgetLastProcessedOrder(Data storage data) internal {
        delete data.orderQueue[data.lastProcessedOrderId];
    }

    struct DepositParams {
        address token0;
        address token1;
        uint256 amount0;
        uint256 amount1;
        uint256 initialRatio;
        uint256 minRatioChangeToSwap;
        uint256 minSwapPrice;
        uint256 maxSwapPrice;
        bool wrap;
        address to;
        uint256 gasLimit;
        uint256 submitDeadline;
        uint256 executionDeadline;
    }

    function deposit(
        Data storage data,
        DepositParams calldata depositParams,
        TokenShares.Data storage tokenShares
    ) external {
        require(
            data.transferGasCosts[depositParams.token0] != 0 && data.transferGasCosts[depositParams.token1] != 0,
            'OS_TOKEN_TRANSFER_GAS_COST_UNSET'
        );
        checkOrderParams(
            data,
            depositParams.to,
            depositParams.gasLimit,
            depositParams.submitDeadline,
            depositParams.executionDeadline,
            ORDER_BASE_COST.add(data.transferGasCosts[depositParams.token0]).add(
                data.transferGasCosts[depositParams.token1]
            )
        );
        require(depositParams.amount0 != 0 || depositParams.amount1 != 0, 'OS_NO_AMOUNT');
        (address pair, uint32 pairId, bool inverted) = getPair(data, depositParams.token0, depositParams.token1);
        require(!data.depositDisabled[pair], 'OS_DEPOSIT_DISABLED');

        uint256 value = msg.value;

        // allocate gas refund
        if (depositParams.token0 == tokenShares.weth && depositParams.wrap) {
            value = value.sub(depositParams.amount0, 'OS_NOT_ENOUGH_FUNDS');
        } else if (depositParams.token1 == tokenShares.weth && depositParams.wrap) {
            value = value.sub(depositParams.amount1, 'OS_NOT_ENOUGH_FUNDS');
        }
        allocateGasRefund(data, value, depositParams.gasLimit);

        uint256 shares0 = tokenShares.amountToShares(depositParams.token0, depositParams.amount0, depositParams.wrap);
        uint256 shares1 = tokenShares.amountToShares(depositParams.token1, depositParams.amount1, depositParams.wrap);

        IIntegralPair(pair).syncWithOracle();
        enqueueDepositOrder(
            data,
            DepositOrder(
                pairId,
                inverted ? shares1 : shares0,
                inverted ? shares0 : shares1,
                depositParams.initialRatio,
                depositParams.minRatioChangeToSwap,
                depositParams.minSwapPrice,
                depositParams.maxSwapPrice,
                depositParams.wrap,
                depositParams.to,
                data.gasPrice,
                depositParams.gasLimit,
                depositParams.executionDeadline
            )
        );
    }

    struct WithdrawParams {
        address token0;
        address token1;
        uint256 liquidity;
        uint256 amount0Min;
        uint256 amount1Min;
        bool unwrap;
        address to;
        uint256 gasLimit;
        uint256 submitDeadline;
        uint256 executionDeadline;
    }

    function withdraw(Data storage data, WithdrawParams calldata withdrawParams) external {
        (address pair, uint32 pairId, bool inverted) = getPair(data, withdrawParams.token0, withdrawParams.token1);
        require(!data.withdrawDisabled[pair], 'OS_WITHDRAW_DISABLED');
        checkOrderParams(
            data,
            withdrawParams.to,
            withdrawParams.gasLimit,
            withdrawParams.submitDeadline,
            withdrawParams.executionDeadline,
            ORDER_BASE_COST.add(PAIR_TRANSFER_COST)
        );
        require(withdrawParams.liquidity != 0, 'OS_NO_LIQUIDITY');

        allocateGasRefund(data, msg.value, withdrawParams.gasLimit);
        pair.safeTransferFrom(msg.sender, address(this), withdrawParams.liquidity);

        IIntegralPair(pair).syncWithOracle();
        enqueueWithdrawOrder(
            data,
            WithdrawOrder(
                pairId,
                withdrawParams.liquidity,
                inverted ? withdrawParams.amount1Min : withdrawParams.amount0Min,
                inverted ? withdrawParams.amount0Min : withdrawParams.amount1Min,
                withdrawParams.unwrap,
                withdrawParams.to,
                data.gasPrice,
                withdrawParams.gasLimit,
                withdrawParams.executionDeadline
            )
        );
    }

    struct SellParams {
        address tokenIn;
        address tokenOut;
        uint256 amountIn;
        uint256 amountOutMin;
        bool wrapUnwrap;
        address to;
        uint256 gasLimit;
        uint256 submitDeadline;
        uint256 executionDeadline;
    }

    function sell(
        Data storage data,
        SellParams calldata sellParams,
        TokenShares.Data storage tokenShares
    ) external {
        require(data.transferGasCosts[sellParams.tokenIn] != 0, 'OS_TOKEN_TRANSFER_GAS_COST_UNSET');
        checkOrderParams(
            data,
            sellParams.to,
            sellParams.gasLimit,
            sellParams.submitDeadline,
            sellParams.executionDeadline,
            ORDER_BASE_COST.add(data.transferGasCosts[sellParams.tokenIn])
        );
        require(sellParams.amountIn != 0, 'OS_NO_AMOUNT_IN');
        (address pair, uint32 pairId, bool inverted) = getPair(data, sellParams.tokenIn, sellParams.tokenOut);
        require(!data.sellDisabled[pair], 'OS_SELL_DISABLED');
        uint256 value = msg.value;

        // allocate gas refund
        if (sellParams.tokenIn == tokenShares.weth && sellParams.wrapUnwrap) {
            value = value.sub(sellParams.amountIn, 'OS_NOT_ENOUGH_FUNDS');
        }
        allocateGasRefund(data, value, sellParams.gasLimit);

        uint256 shares = tokenShares.amountToShares(sellParams.tokenIn, sellParams.amountIn, sellParams.wrapUnwrap);

        IIntegralPair(pair).syncWithOracle();
        enqueueSellOrder(
            data,
            SellOrder(
                pairId,
                inverted,
                shares,
                sellParams.amountOutMin,
                sellParams.wrapUnwrap,
                sellParams.to,
                data.gasPrice,
                sellParams.gasLimit,
                sellParams.executionDeadline
            )
        );
    }

    struct BuyParams {
        address tokenIn;
        address tokenOut;
        uint256 amountInMax;
        uint256 amountOut;
        bool wrapUnwrap;
        address to;
        uint256 gasLimit;
        uint256 submitDeadline;
        uint256 executionDeadline;
    }

    function buy(
        Data storage data,
        BuyParams calldata buyParams,
        TokenShares.Data storage tokenShares
    ) external {
        require(data.transferGasCosts[buyParams.tokenIn] != 0, 'OS_TOKEN_TRANSFER_GAS_COST_UNSET');
        checkOrderParams(
            data,
            buyParams.to,
            buyParams.gasLimit,
            buyParams.submitDeadline,
            buyParams.executionDeadline,
            ORDER_BASE_COST.add(data.transferGasCosts[buyParams.tokenIn])
        );
        require(buyParams.amountOut != 0, 'OS_NO_AMOUNT_OUT');
        (address pair, uint32 pairId, bool inverted) = getPair(data, buyParams.tokenIn, buyParams.tokenOut);
        require(!data.buyDisabled[pair], 'OS_BUY_DISABLED');

        uint256 value = msg.value;

        // allocate gas refund
        if (buyParams.tokenIn == tokenShares.weth && buyParams.wrapUnwrap) {
            value = value.sub(buyParams.amountInMax, 'OS_NOT_ENOUGH_FUNDS');
        }
        allocateGasRefund(data, value, buyParams.gasLimit);

        uint256 shares = tokenShares.amountToShares(buyParams.tokenIn, buyParams.amountInMax, buyParams.wrapUnwrap);

        IIntegralPair(pair).syncWithOracle();
        enqueueBuyOrder(
            data,
            BuyOrder(
                pairId,
                inverted,
                shares,
                buyParams.amountOut,
                buyParams.wrapUnwrap,
                buyParams.to,
                data.gasPrice,
                buyParams.gasLimit,
                buyParams.executionDeadline
            )
        );
    }

    function checkOrderParams(
        Data storage data,
        address to,
        uint256 gasLimit,
        uint256 submitDeadline,
        uint256 executionDeadline,
        uint256 minGasLimit
    ) private view {
        require(submitDeadline >= block.timestamp, 'OS_EXPIRED');
        require(executionDeadline > block.timestamp.add(data.delay), 'OS_INVALID_DEADLINE');
        require(gasLimit <= data.maxGasLimit, 'OS_GAS_LIMIT_TOO_HIGH');
        require(gasLimit >= minGasLimit, 'OS_GAS_LIMIT_TOO_LOW');
        require(to != address(0), 'OS_NO_ADDRESS');
    }

    function allocateGasRefund(
        Data storage data,
        uint256 value,
        uint256 gasLimit
    ) private returns (uint256 futureFee) {
        futureFee = data.gasPrice.mul(gasLimit);
        require(value >= futureFee, 'OS_NOT_ENOUGH_FUNDS');
        if (value > futureFee) {
            msg.sender.transfer(value.sub(futureFee));
        }
    }

    function updateGasPrice(Data storage data, uint256 gasUsed) external {
        uint256 scale = Math.min(gasUsed, data.maxGasPriceImpact);
        uint256 updated = data.gasPrice.mul(data.gasPriceInertia.sub(scale)).add(tx.gasprice.mul(scale)).div(
            data.gasPriceInertia
        );
        // we lower the precision for gas savings in order queue
        data.gasPrice = updated - (updated % 1e6);
    }

    function setMaxGasLimit(Data storage data, uint256 _maxGasLimit) external {
        require(_maxGasLimit <= 10000000, 'OS_MAX_GAS_LIMIT_TOO_HIGH');
        data.maxGasLimit = _maxGasLimit;
        emit MaxGasLimitSet(_maxGasLimit);
    }

    function setGasPriceInertia(Data storage data, uint256 _gasPriceInertia) external {
        require(_gasPriceInertia >= 1, 'OS_INVALID_INERTIA');
        data.gasPriceInertia = _gasPriceInertia;
        emit GasPriceInertiaSet(_gasPriceInertia);
    }

    function setMaxGasPriceImpact(Data storage data, uint256 _maxGasPriceImpact) external {
        require(_maxGasPriceImpact <= data.gasPriceInertia, 'OS_INVALID_MAX_GAS_PRICE_IMPACT');
        data.maxGasPriceImpact = _maxGasPriceImpact;
        emit MaxGasPriceImpactSet(_maxGasPriceImpact);
    }

    function setTransferGasCost(
        Data storage data,
        address token,
        uint256 gasCost
    ) external {
        data.transferGasCosts[token] = gasCost;
        emit TransferGasCostSet(token, gasCost);
    }
}

File 2 of 11 : SafeMath.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, 'SM_ADD_OVERFLOW');
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = sub(x, y, 'SM_SUB_UNDERFLOW');
    }

    function sub(
        uint256 x,
        uint256 y,
        string memory message
    ) internal pure returns (uint256 z) {
        require((z = x - y) <= x, message);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, 'SM_MUL_OVERFLOW');
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, 'SM_DIV_BY_ZERO');
        uint256 c = a / b;
        return c;
    }
}

File 3 of 11 : Math.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

// a library for performing various math operations

library Math {
    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x > y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

File 4 of 11 : IIntegralFactory.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

interface IIntegralFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
    event OwnerSet(address owner);

    function owner() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(
        address tokenA,
        address tokenB,
        address oracle,
        address trader
    ) external returns (address pair);

    function setOwner(address) external;

    function setMintFee(
        address tokenA,
        address tokenB,
        uint256 fee
    ) external;

    function setBurnFee(
        address tokenA,
        address tokenB,
        uint256 fee
    ) external;

    function setSwapFee(
        address tokenA,
        address tokenB,
        uint256 fee
    ) external;

    function setOracle(
        address tokenA,
        address tokenB,
        address oracle
    ) external;

    function setTrader(
        address tokenA,
        address tokenB,
        address trader
    ) external;

    function collect(
        address tokenA,
        address tokenB,
        address to
    ) external;

    function withdraw(
        address tokenA,
        address tokenB,
        uint256 amount,
        address to
    ) external;
}

File 5 of 11 : IERC20.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
}

File 6 of 11 : IIntegralERC20.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

import 'IERC20.sol';

interface IIntegralERC20 is IERC20 {
    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
}

File 7 of 11 : IReserves.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

interface IReserves {
    event Sync(uint112 reserve0, uint112 reserve1);
    event Fees(uint256 fee0, uint256 fee1);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 lastTimestamp
        );

    function getReferences()
        external
        view
        returns (
            uint112 reference0,
            uint112 reference1,
            uint32 epoch
        );

    function getFees() external view returns (uint256 fee0, uint256 fee1);
}

File 8 of 11 : IIntegralPair.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

import 'IIntegralERC20.sol';
import 'IReserves.sol';

interface IIntegralPair is IIntegralERC20, IReserves {
    event Mint(address indexed sender, address indexed to);
    event Burn(address indexed sender, address indexed to);
    event Swap(address indexed sender, address indexed to);
    event SetMintFee(uint256 fee);
    event SetBurnFee(uint256 fee);
    event SetSwapFee(uint256 fee);
    event SetOracle(address account);
    event SetTrader(address trader);
    event SetToken0AbsoluteLimit(uint256 limit);
    event SetToken1AbsoluteLimit(uint256 limit);
    event SetToken0RelativeLimit(uint256 limit);
    event SetToken1RelativeLimit(uint256 limit);
    event SetPriceDeviationLimit(uint256 limit);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function oracle() external view returns (address);

    function trader() external view returns (address);

    function mintFee() external view returns (uint256);

    function setMintFee(uint256 fee) external;

    function mint(address to) external returns (uint256 liquidity);

    function burnFee() external view returns (uint256);

    function setBurnFee(uint256 fee) external;

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swapFee() external view returns (uint256);

    function setSwapFee(uint256 fee) external;

    function setOracle(address account) external;

    function setTrader(address account) external;

    function token0AbsoluteLimit() external view returns (uint256);

    function setToken0AbsoluteLimit(uint256 limit) external;

    function token1AbsoluteLimit() external view returns (uint256);

    function setToken1AbsoluteLimit(uint256 limit) external;

    function token0RelativeLimit() external view returns (uint256);

    function setToken0RelativeLimit(uint256 limit) external;

    function token1RelativeLimit() external view returns (uint256);

    function setToken1RelativeLimit(uint256 limit) external;

    function priceDeviationLimit() external view returns (uint256);

    function setPriceDeviationLimit(uint256 limit) external;

    function collect(address to) external;

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to
    ) external;

    function sync() external;

    function initialize(
        address _token0,
        address _token1,
        address _oracle,
        address _trader
    ) external;

    function syncWithOracle() external;

    function fullSync() external;

    function getSpotPrice() external view returns (uint256 spotPrice);

    function getSwapAmount0In(uint256 amount1Out) external view returns (uint256 swapAmount0In);

    function getSwapAmount1In(uint256 amount0Out) external view returns (uint256 swapAmount1In);

    function getSwapAmount0Out(uint256 amount1In) external view returns (uint256 swapAmount0Out);

    function getSwapAmount1Out(uint256 amount0In) external view returns (uint256 swapAmount1Out);

    function getDepositAmount0In(uint256 amount0) external view returns (uint256 depositAmount0In);

    function getDepositAmount1In(uint256 amount1) external view returns (uint256 depositAmount1In);
}

File 9 of 11 : IWETH.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity =0.7.5;

interface IWETH {
    function deposit() external payable;

    function transfer(address to, uint256 value) external returns (bool);

    function withdraw(uint256) external;
}

File 10 of 11 : TransferHelper.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TH_APPROVE_FAILED');
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TH_TRANSFER_FAILED');
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TH_TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{ value: value }(new bytes(0));
        require(success, 'TH_ETH_TRANSFER_FAILED');
    }
}

File 11 of 11 : TokenShares.sol
// SPDX-License-Identifier: GPL-3.0-or-later
// Deployed with donations via Gitcoin GR9

pragma solidity 0.7.5;

import 'IERC20.sol';
import 'IWETH.sol';
import 'SafeMath.sol';
import 'TransferHelper.sol';

library TokenShares {
    using SafeMath for uint256;
    using TransferHelper for address;

    event UnwrapFailed(address to, uint256 amount);

    struct Data {
        mapping(address => uint256) totalShares;
        address weth;
    }

    function setWeth(Data storage data, address _weth) internal {
        data.weth = _weth;
    }

    function sharesToAmount(
        Data storage data,
        address token,
        uint256 share
    ) external returns (uint256) {
        if (share == 0) {
            return 0;
        }
        if (token == data.weth) {
            return share;
        }
        require(data.totalShares[token] >= share, 'TS_INSUFFICIENT_BALANCE');
        uint256 balance = IERC20(token).balanceOf(address(this));
        uint256 value = balance.mul(share).div(data.totalShares[token]);
        data.totalShares[token] = data.totalShares[token].sub(share);
        return value;
    }

    function amountToShares(
        Data storage data,
        address token,
        uint256 amount,
        bool wrap
    ) external returns (uint256) {
        if (amount == 0) {
            return 0;
        }
        if (token == data.weth) {
            if (wrap) {
                require(msg.value >= amount, 'TS_INSUFFICIENT_AMOUNT');
                IWETH(token).deposit{ value: amount }();
            } else {
                token.safeTransferFrom(msg.sender, address(this), amount);
            }
            return amount;
        } else {
            uint256 balanceBefore = IERC20(token).balanceOf(address(this));
            require(balanceBefore > 0 || data.totalShares[token] == 0, 'TS_INVALID_SHARES');
            if (data.totalShares[token] == 0) {
                data.totalShares[token] = balanceBefore;
            }
            token.safeTransferFrom(msg.sender, address(this), amount);
            uint256 balanceAfter = IERC20(token).balanceOf(address(this));
            require(balanceAfter > balanceBefore, 'TS_INVALID_TRANSFER');
            if (balanceBefore > 0) {
                uint256 lastShares = data.totalShares[token];
                data.totalShares[token] = lastShares.mul(balanceAfter).div(balanceBefore);
                return data.totalShares[token] - lastShares;
            } else {
                data.totalShares[token] = balanceAfter;
                data.totalShares[token] = balanceAfter;
                return balanceAfter;
            }
        }
    }

    function onUnwrapFailed(
        Data storage data,
        address to,
        uint256 amount
    ) external {
        emit UnwrapFailed(to, amount);
        IWETH(data.weth).deposit{ value: amount }();
        TransferHelper.safeTransfer(data.weth, to, amount);
    }
}

Settings
{
  "libraries": {
    "SafeMath.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "Math.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IIntegralFactory.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IERC20.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IIntegralERC20.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IReserves.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IIntegralPair.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "IWETH.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "TransferHelper.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "TokenShares.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    },
    "Orders.sol": {
      "TokenShares": "0xc82938b53e0e190459ba4e3502bf26f194760183"
    }
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

API
[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderId","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"validAfterTimestamp","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"gasPrice","type":"uint256"}],"name":"BuyEnqueued","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderId","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"validAfterTimestamp","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"gasPrice","type":"uint256"}],"name":"DepositEnqueued","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"gasPriceInertia","type":"uint256"}],"name":"GasPriceInertiaSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maxGasLimit","type":"uint256"}],"name":"MaxGasLimitSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maxGasPriceImpact","type":"uint256"}],"name":"MaxGasPriceImpactSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderId","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"validAfterTimestamp","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"gasPrice","type":"uint256"}],"name":"SellEnqueued","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"gasCost","type":"uint256"}],"name":"TransferGasCostSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderId","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"validAfterTimestamp","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"gasPrice","type":"uint256"}],"name":"WithdrawEnqueued","type":"event"},{"inputs":[],"name":"ETHER_TRANSFER_CALL_COST","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ORDER_BASE_COST","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PAIR_TRANSFER_COST","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"REFUND_END_COST","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"gasPrice32","type":"uint32"}],"name":"uint32ToGasPrice","outputs":[{"internalType":"uint256","name":"gasPrice","type":"uint256"}],"stateMutability":"pure","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.