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/**
 *Submitted for verification at Etherscan.io on 2021-05-28
*/

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

library FullMath {
    function fullMul(uint256 x, uint256 y) private pure returns (uint256 l, uint256 h) {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);
        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;
        require(h < d, 'FullMath::mulDiv: overflow');
        return fullDiv(l, h, d);
    }
}

library Babylonian {

    function sqrt(uint256 x) internal pure returns (uint256) {
        if (x == 0) return 0;

        uint256 xx = x;
        uint256 r = 1;
        if (xx >= 0x100000000000000000000000000000000) {
            xx >>= 128;
            r <<= 64;
        }
        if (xx >= 0x10000000000000000) {
            xx >>= 64;
            r <<= 32;
        }
        if (xx >= 0x100000000) {
            xx >>= 32;
            r <<= 16;
        }
        if (xx >= 0x10000) {
            xx >>= 16;
            r <<= 8;
        }
        if (xx >= 0x100) {
            xx >>= 8;
            r <<= 4;
        }
        if (xx >= 0x10) {
            xx >>= 4;
            r <<= 2;
        }
        if (xx >= 0x8) {
            r <<= 1;
        }
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1; // Seven iterations should be enough
        uint256 r1 = x / r;
        return (r < r1 ? r : r1);
    }
}

library BitMath {

    function mostSignificantBit(uint256 x) internal pure returns (uint8 r) {
        require(x > 0, 'BitMath::mostSignificantBit: zero');

        if (x >= 0x100000000000000000000000000000000) {
            x >>= 128;
            r += 128;
        }
        if (x >= 0x10000000000000000) {
            x >>= 64;
            r += 64;
        }
        if (x >= 0x100000000) {
            x >>= 32;
            r += 32;
        }
        if (x >= 0x10000) {
            x >>= 16;
            r += 16;
        }
        if (x >= 0x100) {
            x >>= 8;
            r += 8;
        }
        if (x >= 0x10) {
            x >>= 4;
            r += 4;
        }
        if (x >= 0x4) {
            x >>= 2;
            r += 2;
        }
        if (x >= 0x2) r += 1;
    }
}

library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = 0x10000000000000000000000000000;
    uint256 private constant Q224 = 0x100000000000000000000000000000000000000000000000000000000;
    uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a uq112x112 into a uint with 18 decimals of precision
    function decode112with18(uq112x112 memory self) internal pure returns (uint) {
        return uint(self._x) / 5192296858534827;
    }

    function fraction(uint256 numerator, uint256 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, 'FixedPoint::fraction: division by zero');
        if (numerator == 0) return FixedPoint.uq112x112(0);

        if (numerator <= uint144(-1)) {
            uint256 result = (numerator << RESOLUTION) / denominator;
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        } else {
            uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        }
    }

    // square root of a UQ112x112
    // lossy between 0/1 and 40 bits
    function sqrt(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        if (self._x <= uint144(-1)) {
            return uq112x112(uint224(Babylonian.sqrt(uint256(self._x) << 112)));
        }

        uint8 safeShiftBits = 255 - BitMath.mostSignificantBit(self._x);
        safeShiftBits -= safeShiftBits % 2;
        return uq112x112(uint224(Babylonian.sqrt(uint256(self._x) << safeShiftBits) << ((112 - safeShiftBits) / 2)));
    }
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {

        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add( div( a, 2), 1 );
            while (b < c) {
                c = b;
                b = div( add( div( a, b ), b), 2 );
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

interface IERC20 {
    function decimals() external view returns (uint8);
}

interface IUniswapV2ERC20 {
    function totalSupply() external view returns (uint);
}

interface IUniswapV2Pair is IUniswapV2ERC20 {
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function token0() external view returns ( address );
    function token1() external view returns ( address );
}

interface IBondingCalculator {
  function valuation( address pair_, uint amount_ ) external view returns ( uint _value );
}

contract OlympusBondingCalculator is IBondingCalculator {

    using FixedPoint for *;
    using SafeMath for uint;
    using SafeMath for uint112;

    address public immutable OHM;

    constructor( address _OHM ) {
        require( _OHM != address(0) );
        OHM = _OHM;
    }

    function getKValue( address _pair ) public view returns( uint k_ ) {
        uint token0 = IERC20( IUniswapV2Pair( _pair ).token0() ).decimals();
        uint token1 = IERC20( IUniswapV2Pair( _pair ).token1() ).decimals();
        uint decimals = token0.add( token1 ).sub( IERC20( _pair ).decimals() );

        (uint reserve0, uint reserve1, ) = IUniswapV2Pair( _pair ).getReserves();
        k_ = reserve0.mul(reserve1).div( 10 ** decimals );
    }

    function getTotalValue( address _pair ) public view returns ( uint _value ) {
        _value = getKValue( _pair ).sqrrt().mul(2);
    }

    function valuation( address _pair, uint amount_ ) external view override returns ( uint _value ) {
        uint totalValue = getTotalValue( _pair );
        uint totalSupply = IUniswapV2Pair( _pair ).totalSupply();

        _value = totalValue.mul( FixedPoint.fraction( amount_, totalSupply ).decode112with18() ).div( 1e18 );
    }

    function markdown( address _pair ) external view returns ( uint ) {
        ( uint reserve0, uint reserve1, ) = IUniswapV2Pair( _pair ).getReserves();

        uint reserve;
        if ( IUniswapV2Pair( _pair ).token0() == OHM ) {
            reserve = reserve1;
        } else {
            reserve = reserve0;
        }
        return reserve.mul( 2 * ( 10 ** IERC20( OHM ).decimals() ) ).div( getTotalValue( _pair ) );
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_OHM","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"OHM","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_pair","type":"address"}],"name":"getKValue","outputs":[{"internalType":"uint256","name":"k_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_pair","type":"address"}],"name":"getTotalValue","outputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_pair","type":"address"}],"name":"markdown","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_pair","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"valuation","outputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000383518188c0c6d7730d91b2c03a03c837814a899

-----Decoded View---------------
Arg [0] : _OHM (address): 0x383518188C0C6d7730D91b2c03a03C837814a899

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000383518188c0c6d7730d91b2c03a03c837814a899

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ipfs://30f83e0ed85f0e017df1706cee83531dc0c311ef3fcf548ef4662e87081dd450