Contract 0x951d51baefb72319d9fbe941e1615938d89abfe2

 
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0x808c1073d8d6f5d4c3682be32617d98d402f00d955c97aff951751d468837a9fApprove106747482020-08-17 1:52:36264 days 11 hrs ago0x1ca04bdbc1d24ccad2d27a630ad4eee369dd9ad5 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00382089486
0xde23e3756166672794e7386e40bb476b9e54c4f2001d728c0a177675be40a0cdTransfer106163292020-08-08 1:54:41273 days 11 hrs ago0x938a0af4b86057489bc651dd02c080890d8ed5e5 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00095224545
0x75cc437feeaee4af3720ade6face8963e111f9e3570840b2b92cf07d98739045Transfer106015942020-08-05 19:18:45275 days 18 hrs ago0xe2ca0b055ad5d58dc2daa61f022c86725c6afd62 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00114269454
0xe9413523e1b775c1cd88ae0e2986a13ea3fbc838eb75d4e1742f1a4d0cd526c4Approve105955042020-08-04 20:42:06276 days 16 hrs ago0x076c95c6cd2eb823acc6347fdf5b3dd9b83511e4 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00185190642
0xe7e164557a7ec20600a6d7eb0962ca6028576be0bcd340da842fe1fab4c4cd86Add And Sell ERC...105935632020-08-04 13:28:42276 days 23 hrs ago0x2bafb2c696a78ed3c7084c6af715769455ce48fb IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01102431467
0x33753bd9a37dbe1b90f30bf738b9264471eac2768941902098c1189df6e99672Add And Sell ERC...105935042020-08-04 13:18:48277 days 6 mins ago0x2bafb2c696a78ed3c7084c6af715769455ce48fb IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01102431467
0x98935b0363e8f0da255dbccf9e15626a2ef943bcc1a52c7be5e74485e8f6e3c0Create And Sell ...105934912020-08-04 13:16:14277 days 8 mins ago0x2bafb2c696a78ed3c7084c6af715769455ce48fb IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01634470266
0xd2263f40d83d5707afaab3d85e86aaeb06423959fdb19db48869558b70b3b442Create And Sell ...105930662020-08-04 11:46:27277 days 1 hr ago0x2c5abc767ab347a852112b80bf62b221f15a6fe7 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.014858160
0x6e7072b20fdc5413e485d504d5e6c2826449f8929f2a14cb8c11634170bee25fAdd And Sell ERC...105928312020-08-04 10:55:16277 days 2 hrs ago0x0a338782562e1740b9468f0855dd4c51f29defde IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0104687870
0xed05cd96a664cf0a8a2624432bb22dc97221c5a8ee0f50d5f8eed26881d182d2Create And Sell ...105928222020-08-04 10:52:39277 days 2 hrs ago0x000a0b24b1476f647a2a2fa4474f9ed32c685a8e IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01651793771
0x4283a5ed79660890c1ebaf433879734facccf4f4f007e6935786b260a9027ab2Add And Sell ERC...105927982020-08-04 10:47:14277 days 2 hrs ago0xa077bd3f8cdf7181f2beae0f1ffb71d27285034f IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01036690263
0xa7188efaa86eeb420490c5fdd2f3ce944761072b37974367f6c58dfbdd86abb4Remove Collatera...105926852020-08-04 10:22:03277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0047165490
0x4f9bd5eea61b2bf93185239998a83dc2fc96cf3200e29d1facd130109448fd7dBurn O Tokens105926792020-08-04 10:21:04277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00190323585
0x341c84533f959dccb9ecd7ef10d844a05829faec884cf0ea7a67c87caabf9033Add And Sell ERC...105925982020-08-04 10:00:40277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0139850585
0xacf7f77d1ae978fd778836f4bcfa1de45d858b6aad454e9f481745ca25f011d2Create And Sell ...105925892020-08-04 9:58:07277 days 3 hrs ago0xa077bd3f8cdf7181f2beae0f1ffb71d27285034f IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01510646761
0x7219f3959487c4a6d9928bd96a7524159211864375a7885841f224afa4105154Create And Sell ...105925212020-08-04 9:42:33277 days 3 hrs ago0x0ac545310921e4885dc4cf5f758d7c49e8974482 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01609627565
0x3948ca645d6feac2ca48ddee736de46b47da46514a29c95df378388e21dd63dbCreate And Sell ...105925182020-08-04 9:42:03277 days 3 hrs ago0x2ea631bda7f9bb50b441c7d627f0a89d1fee0ebc IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01659074167
0x213bc0538761191dd42dbc0cb8f15b102b4cf393103cd46aab72ccc44d73d504Approve105925132020-08-04 9:41:41277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00333217575
0xfa315ed788fc7da673244d09891341aee83f247988d3e633f06b92b5cfb1c830Issue O Tokens105925072020-08-04 9:40:36277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.00534637575
0x903c8bbdb09012a60911271b819d431ce08e01323cbdfe918f0428fff1ca8b12Add ERC20Collate...105925002020-08-04 9:39:11277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0051288880
0x4f4f22d647edc19688f543cfe147db0c3f8422482454053811cb8874d3bb06cbCreate And Sell ...105924712020-08-04 9:33:36277 days 3 hrs ago0x02ab1b3a8ac8e1aa17756058e67ef68be0508a2d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0222871590
0xa14d0f59b67b3b5b53ce5af459c9495505aa05aa744026a7e210c33d41b19236Create And Sell ...105890982020-08-03 20:53:53277 days 16 hrs ago0x06423ce89dbe96b4c3cb89bcc39c5642ed851ced IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01114411545
0x053294a353e527a9837aa0b3cdb299aefbf77368ee210fd9d6407a136646cecaCreate And Sell ...105882922020-08-03 17:56:23277 days 19 hrs ago0x02062b8727cdde62cd784382c60d738fcdbb736d IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.01023646844
0x85db41f92e0b55c508035bd552c746eb389cc1a71a3af35b2349c8e705b80cc8Approve105875952020-08-03 15:25:41277 days 21 hrs ago0x3a0cca1a832644b60730e5d4c27947c5de609d62 IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.004576187103
0x95baf66131fa566a835970d42713b854f4ae3705263979a02f66c26bec93f85eApprove105853232020-08-03 6:54:13278 days 6 hrs ago0x66296e35273c4010fe5c5d8e94dca108adbd81fc IN  0x951d51baefb72319d9fbe941e1615938d89abfe20 Ether0.0031100370
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0x56de6c4bd906ee0c067a332e64966db8b1e866c7965c044163a503de6ee6552a105925172020-08-04 9:41:56277 days 3 hrs ago 0x951d51baefb72319d9fbe941e1615938d89abfe2 0xe7870231992ab4b1a01814fa0a599115fe94203f30 Ether
0x56de6c4bd906ee0c067a332e64966db8b1e866c7965c044163a503de6ee6552a105925172020-08-04 9:41:56277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe230 Ether
0x351bcbb182cb11cecb0d50d9f1bf45bd6820b71f7de5ec1ef607518865d43dc2105925042020-08-04 9:40:14277 days 3 hrs ago 0x951d51baefb72319d9fbe941e1615938d89abfe2 0xe7870231992ab4b1a01814fa0a599115fe94203f45 Ether
0x351bcbb182cb11cecb0d50d9f1bf45bd6820b71f7de5ec1ef607518865d43dc2105925042020-08-04 9:40:14277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe227 Ether
0x351bcbb182cb11cecb0d50d9f1bf45bd6820b71f7de5ec1ef607518865d43dc2105925042020-08-04 9:40:14277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe218 Ether
0x1aadc7e064fbbb886820692c9bfe92f59bb19fed21be379166847b876a1f86cd105924692020-08-04 9:33:19277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe275 Ether
0x2f1d502ea1dfb312b5e716fb3ecd72af1354963b5ff9ae2637a72002d9083d2f105924522020-08-04 9:30:20277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe275 Ether
0x04b289b206054a1f4b0e287fd0b5a1dba9300d26f85571c0b56b0b3664dd036a105924442020-08-04 9:28:47277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe275 Ether
0xd06378b73536e7718895069a5219855774d362db47312dc304dfd4b6e39ef000105924282020-08-04 9:25:54277 days 3 hrs ago 0x951d51baefb72319d9fbe941e1615938d89abfe2 0xe7870231992ab4b1a01814fa0a599115fe94203f75 Ether
0xd06378b73536e7718895069a5219855774d362db47312dc304dfd4b6e39ef000105924282020-08-04 9:25:54277 days 3 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe275 Ether
0xa858463f30a08c6f3410ed456e59277fbe62ff14225754d2bb0b4f6a75fdc8ad105924022020-08-04 9:21:30277 days 4 hrs ago 0x951d51baefb72319d9fbe941e1615938d89abfe2 0xe7870231992ab4b1a01814fa0a599115fe94203f272 Ether
0xa858463f30a08c6f3410ed456e59277fbe62ff14225754d2bb0b4f6a75fdc8ad105924022020-08-04 9:21:30277 days 4 hrs ago 0xe7870231992ab4b1a01814fa0a599115fe94203f 0x951d51baefb72319d9fbe941e1615938d89abfe2272 Ether
0x3ab040a20dba4893ff036e6c7becdf6ac29e5186f66618c4d86012192ac46237105634802020-07-30 22:07:23281 days 15 hrs ago Opyn: Options Factory  Contract Creation0 Ether
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x87fe8eba753076a943bd2a5f6c3556188064797e

Contract Name:
oToken

Compiler Version
v0.5.10+commit.5a6ea5b1

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Unlicense license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-03-16
*/

// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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;
    }

    /**
     * @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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

     /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

// File: contracts/lib/CompoundOracleInterface.sol

pragma solidity ^0.5.0;
// AT MAINNET ADDRESS: 0x02557a5E05DeFeFFD4cAe6D83eA3d173B272c904

contract CompoundOracleInterface {
    // returns asset:eth -- to get USDC:eth, have to do 10**24/result,


    constructor() public {
    }

    /**
  * @notice retrieves price of an asset
  * @dev function to get price for an asset
  * @param asset Asset for which to get the price
  * @return uint mantissa of asset price (scaled by 1e18) or zero if unset or contract paused
  */
    function getPrice(address asset) public view returns (uint);
    function getUnderlyingPrice(ERC20 cToken) public view returns (uint);
    // function getPrice(address asset) public view returns (uint) {
    //     return 527557000000000;
    // }

}

// File: contracts/lib/UniswapExchangeInterface.sol

pragma solidity 0.5.10;


// Solidity Interface
contract UniswapExchangeInterface {
    // Address of ERC20 token sold on this exchange
    function tokenAddress() external view returns (address token);
    // Address of Uniswap Factory
    function factoryAddress() external view returns (address factory);
    // Provide Liquidity
    function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256);
    function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256);
    // Get Prices
    function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought);
    function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold);
    function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought);
    function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold);
    // Trade ETH to ERC20
    function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256  tokens_bought);
    function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256  tokens_bought);
    function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256  eth_sold);
    function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256  eth_sold);
    // Trade ERC20 to ETH
    function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256  eth_bought);
    function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256  eth_bought);
    function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256  tokens_sold);
    function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256  tokens_sold);
    // Trade ERC20 to ERC20
    function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256  tokens_sold);
    function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_sold);
    // Trade ERC20 to Custom Pool
    function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256  tokens_sold);
    function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_sold);
    // ERC20 comaptibility for liquidity tokens
    bytes32 public name;
    bytes32 public symbol;
    uint256 public decimals;
    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    // Never use
    function setup(address token_addr) external;
}

// File: contracts/lib/UniswapFactoryInterface.sol

pragma solidity 0.5.10;


// Solidity Interface
contract UniswapFactoryInterface {
    // Public Variables
    address public exchangeTemplate;
    uint256 public tokenCount;
    // // Create Exchange
    function createExchange(address token) external returns (address exchange);
    // Get Exchange and Token Info
    function getExchange(address token) external view returns (address exchange);
    function getToken(address exchange) external view returns (address token);
    function getTokenWithId(uint256 tokenId) external view returns (address token);
    // Never use
    function initializeFactory(address template) external;
    // function createExchange(address token) external returns (address exchange) {
    //     return 0x06D014475F84Bb45b9cdeD1Cf3A1b8FE3FbAf128;
    // }
    // // Get Exchange and Token Info
    // function getExchange(address token) external view returns (address exchange){
    //     return 0x06D014475F84Bb45b9cdeD1Cf3A1b8FE3FbAf128;
    // }
    // function getToken(address exchange) external view returns (address token) {
    //     return 0x06D014475F84Bb45b9cdeD1Cf3A1b8FE3FbAf128;
    // }
    // function getTokenWithId(uint256 tokenId) external view returns (address token) {
    //     return 0x06D014475F84Bb45b9cdeD1Cf3A1b8FE3FbAf128;
    // }
}

// File: contracts/OptionsUtils.sol

pragma solidity 0.5.10;





contract OptionsUtils {
    // defauls are for mainnet
    UniswapFactoryInterface public UNISWAP_FACTORY;

    CompoundOracleInterface public COMPOUND_ORACLE;

    constructor(address _uniswapFactory, address _compoundOracle) public {
        UNISWAP_FACTORY = UniswapFactoryInterface(_uniswapFactory);
        COMPOUND_ORACLE = CompoundOracleInterface(_compoundOracle);
    }

    // TODO: for now gets Uniswap, later update to get other exchanges
    function getExchange(address _token)
        public
        view
        returns (UniswapExchangeInterface)
    {
        if (address(UNISWAP_FACTORY.getExchange(_token)) == address(0)) {
            revert("No payout exchange");
        }

        UniswapExchangeInterface exchange = UniswapExchangeInterface(
            UNISWAP_FACTORY.getExchange(_token)
        );

        return exchange;
    }

    function isETH(IERC20 _ierc20) public pure returns (bool) {
        return _ierc20 == IERC20(0);
    }
}

// File: contracts/OptionsExchange.sol

pragma solidity 0.5.10;






contract OptionsExchange {
    uint256 constant LARGE_BLOCK_SIZE = 1651753129000;
    uint256 constant LARGE_APPROVAL_NUMBER = 10**30;

    UniswapFactoryInterface public UNISWAP_FACTORY;

    constructor(address _uniswapFactory) public {
        UNISWAP_FACTORY = UniswapFactoryInterface(_uniswapFactory);
    }

    /*** Events ***/
    event SellOTokens(
        address seller,
        address payable receiver,
        address oTokenAddress,
        address payoutTokenAddress,
        uint256 oTokensToSell,
        uint256 payoutTokensReceived
    );
    event BuyOTokens(
        address buyer,
        address payable receiver,
        address oTokenAddress,
        address paymentTokenAddress,
        uint256 oTokensToBuy,
        uint256 premiumPaid
    );

    /**
    * @notice This function sells oTokens on Uniswap and sends back payoutTokens to the receiver
    * @param receiver The address to send the payout tokens back to
    * @param oTokenAddress The address of the oToken to sell
    * @param payoutTokenAddress The address of the token to receive the premiums in
    * @param oTokensToSell The number of oTokens to sell
    */
    function sellOTokens(
        address payable receiver,
        address oTokenAddress,
        address payoutTokenAddress,
        uint256 oTokensToSell
    ) public {
        // @note: first need to bootstrap the uniswap exchange to get the address.
        IERC20 oToken = IERC20(oTokenAddress);
        IERC20 payoutToken = IERC20(payoutTokenAddress);
        oToken.transferFrom(msg.sender, address(this), oTokensToSell);
        uint256 payoutTokensReceived = uniswapSellOToken(
            oToken,
            payoutToken,
            oTokensToSell,
            receiver
        );

        emit SellOTokens(
            msg.sender,
            receiver,
            oTokenAddress,
            payoutTokenAddress,
            oTokensToSell,
            payoutTokensReceived
        );
    }

    /**
    * @notice This function buys oTokens on Uniswap and using paymentTokens from the receiver
    * @param receiver The address to send the oTokens back to
    * @param oTokenAddress The address of the oToken to buy
    * @param paymentTokenAddress The address of the token to pay the premiums in
    * @param oTokensToBuy The number of oTokens to buy
    */
    function buyOTokens(
        address payable receiver,
        address oTokenAddress,
        address paymentTokenAddress,
        uint256 oTokensToBuy
    ) public payable {
        IERC20 oToken = IERC20(oTokenAddress);
        IERC20 paymentToken = IERC20(paymentTokenAddress);
        uniswapBuyOToken(paymentToken, oToken, oTokensToBuy, receiver);
    }

    /**
    * @notice This function calculates the amount of premiums that the seller
    * will receive if they sold oTokens on Uniswap
    * @param oTokenAddress The address of the oToken to sell
    * @param payoutTokenAddress The address of the token to receive the premiums in
    * @param oTokensToSell The number of oTokens to sell
    */
    function premiumReceived(
        address oTokenAddress,
        address payoutTokenAddress,
        uint256 oTokensToSell
    ) public view returns (uint256) {
        // get the amount of ETH that will be paid out if oTokensToSell is sold.
        UniswapExchangeInterface oTokenExchange = getExchange(oTokenAddress);
        uint256 ethReceived = oTokenExchange.getTokenToEthInputPrice(
            oTokensToSell
        );

        if (!isETH(IERC20(payoutTokenAddress))) {
            // get the amount of payout tokens that will be received if the ethRecieved is sold.
            UniswapExchangeInterface payoutExchange = getExchange(
                payoutTokenAddress
            );
            return payoutExchange.getEthToTokenInputPrice(ethReceived);
        }
        return ethReceived;

    }

    /**
    * @notice This function calculates the premiums to be paid if a buyer wants to
    * buy oTokens on Uniswap
    * @param oTokenAddress The address of the oToken to buy
    * @param paymentTokenAddress The address of the token to pay the premiums in
    * @param oTokensToBuy The number of oTokens to buy
    */
    function premiumToPay(
        address oTokenAddress,
        address paymentTokenAddress,
        uint256 oTokensToBuy
    ) public view returns (uint256) {
        // get the amount of ETH that needs to be paid for oTokensToBuy.
        UniswapExchangeInterface oTokenExchange = getExchange(oTokenAddress);
        uint256 ethToPay = oTokenExchange.getEthToTokenOutputPrice(
            oTokensToBuy
        );

        if (!isETH(IERC20(paymentTokenAddress))) {
            // get the amount of paymentTokens that needs to be paid to get the desired ethToPay.
            UniswapExchangeInterface paymentTokenExchange = getExchange(
                paymentTokenAddress
            );
            return paymentTokenExchange.getTokenToEthOutputPrice(ethToPay);
        }

        return ethToPay;
    }

    function uniswapSellOToken(
        IERC20 oToken,
        IERC20 payoutToken,
        uint256 _amt,
        address payable _transferTo
    ) internal returns (uint256) {
        require(!isETH(oToken), "Can only sell oTokens");
        UniswapExchangeInterface exchange = getExchange(address(oToken));

        if (isETH(payoutToken)) {
            //Token to ETH
            oToken.approve(address(exchange), _amt);
            return
                exchange.tokenToEthTransferInput(
                    _amt,
                    1,
                    LARGE_BLOCK_SIZE,
                    _transferTo
                );
        } else {
            //Token to Token
            oToken.approve(address(exchange), _amt);
            return
                exchange.tokenToTokenTransferInput(
                    _amt,
                    1,
                    1,
                    LARGE_BLOCK_SIZE,
                    _transferTo,
                    address(payoutToken)
                );
        }
    }

    function uniswapBuyOToken(
        IERC20 paymentToken,
        IERC20 oToken,
        uint256 _amt,
        address payable _transferTo
    ) public returns (uint256) {
        require(!isETH(oToken), "Can only buy oTokens");

        if (!isETH(paymentToken)) {
            UniswapExchangeInterface exchange = getExchange(
                address(paymentToken)
            );

            uint256 paymentTokensToTransfer = premiumToPay(
                address(oToken),
                address(paymentToken),
                _amt
            );
            paymentToken.transferFrom(
                msg.sender,
                address(this),
                paymentTokensToTransfer
            );

            // Token to Token
            paymentToken.approve(address(exchange), LARGE_APPROVAL_NUMBER);

            emit BuyOTokens(
                msg.sender,
                _transferTo,
                address(oToken),
                address(paymentToken),
                _amt,
                paymentTokensToTransfer
            );

            return
                exchange.tokenToTokenTransferInput(
                    paymentTokensToTransfer,
                    1,
                    1,
                    LARGE_BLOCK_SIZE,
                    _transferTo,
                    address(oToken)
                );
        } else {
            // ETH to Token
            UniswapExchangeInterface exchange = UniswapExchangeInterface(
                UNISWAP_FACTORY.getExchange(address(oToken))
            );

            uint256 ethToTransfer = exchange.getEthToTokenOutputPrice(_amt);

            emit BuyOTokens(
                msg.sender,
                _transferTo,
                address(oToken),
                address(paymentToken),
                _amt,
                ethToTransfer
            );

            return
                exchange.ethToTokenTransferOutput.value(ethToTransfer)(
                    _amt,
                    LARGE_BLOCK_SIZE,
                    _transferTo
                );
        }
    }

    function getExchange(address _token)
        internal
        view
        returns (UniswapExchangeInterface)
    {
        UniswapExchangeInterface exchange = UniswapExchangeInterface(
            UNISWAP_FACTORY.getExchange(_token)
        );

        if (address(exchange) == address(0)) {
            revert("No payout exchange");
        }

        return exchange;
    }

    function isETH(IERC20 _ierc20) internal pure returns (bool) {
        return _ierc20 == IERC20(0);
    }

    function() external payable {
        // to get ether from uniswap exchanges
    }

}

// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

// File: @openzeppelin/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/OptionsContract.sol

pragma solidity 0.5.10;











/**
 * @title Opyn's Options Contract
 * @author Opyn
 */
contract OptionsContract is Ownable, ERC20 {
    using SafeMath for uint256;

    /* represents floting point numbers, where number = value * 10 ** exponent
    i.e 0.1 = 10 * 10 ** -3 */
    struct Number {
        uint256 value;
        int32 exponent;
    }

    // Keeps track of the weighted collateral and weighted debt for each vault.
    struct Vault {
        uint256 collateral;
        uint256 oTokensIssued;
        uint256 underlying;
        bool owned;
    }

    OptionsExchange public optionsExchange;

    mapping(address => Vault) internal vaults;

    address payable[] internal vaultOwners;

    // 10 is 0.01 i.e. 1% incentive.
    Number public liquidationIncentive = Number(10, -3);

    // 100 is egs. 0.1 i.e. 10%.
    Number public transactionFee = Number(0, -3);

    /* 500 is 0.5. Max amount that a Vault can be liquidated by i.e.
    max collateral that can be taken in one function call */
    Number public liquidationFactor = Number(500, -3);

    /* 16 means 1.6. The minimum ratio of a Vault's collateral to insurance promised.
    The ratio is calculated as below:
    vault.collateral / (Vault.oTokensIssued * strikePrice) */
    Number public minCollateralizationRatio = Number(16, -1);

    // The amount of insurance promised per oToken
    Number public strikePrice;

    // The amount of underlying that 1 oToken protects.
    Number public oTokenExchangeRate;

    /* UNIX time.
    Exercise period starts at `(expiry - windowSize)` and ends at `expiry` */
    uint256 internal windowSize;

    /* The total fees accumulated in the contract any time liquidate or exercise is called */
    uint256 internal totalFee;

    // The time of expiry of the options contract
    uint256 public expiry;

    // The precision of the collateral
    int32 public collateralExp = -18;

    // The precision of the underlying
    int32 public underlyingExp = -18;

    // The collateral asset
    IERC20 public collateral;

    // The asset being protected by the insurance
    IERC20 public underlying;

    // The asset in which insurance is denominated in.
    IERC20 public strike;

    // The Oracle used for the contract
    CompoundOracleInterface public COMPOUND_ORACLE;

    // The name of  the contract
    string public name;

    // The symbol of  the contract
    string public symbol;

    // The number of decimals of the contract
    uint8 public decimals;

    /**
    * @param _collateral The collateral asset
    * @param _collExp The precision of the collateral (-18 if ETH)
    * @param _underlying The asset that is being protected
    * @param _underlyingExp The precision of the underlying asset
    * @param _oTokenExchangeExp The precision of the `amount of underlying` that 1 oToken protects
    * @param _strikePrice The amount of strike asset that will be paid out per oToken
    * @param _strikeExp The precision of the strike price.
    * @param _strike The asset in which the insurance is calculated
    * @param _expiry The time at which the insurance expires
    * @param _optionsExchange The contract which interfaces with the exchange + oracle
    * @param _oracleAddress The address of the oracle
    * @param _windowSize UNIX time. Exercise window is from `expiry - _windowSize` to `expiry`.
    */
    constructor(
        IERC20 _collateral,
        int32 _collExp,
        IERC20 _underlying,
        int32 _underlyingExp,
        int32 _oTokenExchangeExp,
        uint256 _strikePrice,
        int32 _strikeExp,
        IERC20 _strike,
        uint256 _expiry,
        OptionsExchange _optionsExchange,
        address _oracleAddress,
        uint256 _windowSize
    ) public {
        require(block.timestamp < _expiry, "Can't deploy an expired contract");
        require(
            _windowSize <= _expiry,
            "Exercise window can't be longer than the contract's lifespan"
        );
        require(
            isWithinExponentRange(_collExp),
            "collateral exponent not within expected range"
        );
        require(
            isWithinExponentRange(_underlyingExp),
            "underlying exponent not within expected range"
        );
        require(
            isWithinExponentRange(_strikeExp),
            "strike price exponent not within expected range"
        );
        require(
            isWithinExponentRange(_oTokenExchangeExp),
            "oToken exchange rate exponent not within expected range"
        );

        collateral = _collateral;
        collateralExp = _collExp;

        underlying = _underlying;
        underlyingExp = _underlyingExp;
        oTokenExchangeRate = Number(1, _oTokenExchangeExp);

        strikePrice = Number(_strikePrice, _strikeExp);
        strike = _strike;

        expiry = _expiry;
        COMPOUND_ORACLE = CompoundOracleInterface(_oracleAddress);
        optionsExchange = _optionsExchange;
        windowSize = _windowSize;
    }

    /*** Events ***/
    event VaultOpened(address payable vaultOwner);
    event ETHCollateralAdded(
        address payable vaultOwner,
        uint256 amount,
        address payer
    );
    event ERC20CollateralAdded(
        address payable vaultOwner,
        uint256 amount,
        address payer
    );
    event IssuedOTokens(
        address issuedTo,
        uint256 oTokensIssued,
        address payable vaultOwner
    );
    event Liquidate(
        uint256 amtCollateralToPay,
        address payable vaultOwner,
        address payable liquidator
    );
    event Exercise(
        uint256 amtUnderlyingToPay,
        uint256 amtCollateralToPay,
        address payable exerciser,
        address payable vaultExercisedFrom
    );
    event RedeemVaultBalance(
        uint256 amtCollateralRedeemed,
        uint256 amtUnderlyingRedeemed,
        address payable vaultOwner
    );
    event BurnOTokens(address payable vaultOwner, uint256 oTokensBurned);
    event RemoveCollateral(uint256 amtRemoved, address payable vaultOwner);
    event UpdateParameters(
        uint256 liquidationIncentive,
        uint256 liquidationFactor,
        uint256 transactionFee,
        uint256 minCollateralizationRatio,
        address owner
    );
    event TransferFee(address payable to, uint256 fees);
    event RemoveUnderlying(
        uint256 amountUnderlying,
        address payable vaultOwner
    );

    /**
     * @dev Throws if called Options contract is expired.
     */
    modifier notExpired() {
        require(!hasExpired(), "Options contract expired");
        _;
    }

    /**
     * @notice This function gets the array of vaultOwners
     */
    function getVaultOwners() public view returns (address payable[] memory) {
        address payable[] memory owners;
        uint256 index = 0;
        for (uint256 i = 0; i < vaultOwners.length; i++) {
            if (hasVault(vaultOwners[i])) {
                owners[index] = vaultOwners[i];
                index++;
            }
        }

        return owners;
    }

    /**
     * @notice Can only be called by owner. Used to update the fees, minminCollateralizationRatio, etc
     * @param _liquidationIncentive The incentive paid to liquidator. 10 is 0.01 i.e. 1% incentive.
     * @param _liquidationFactor Max amount that a Vault can be liquidated by. 500 is 0.5.
     * @param _transactionFee The fees paid to our protocol every time a execution happens. 100 is egs. 0.1 i.e. 10%.
     * @param _minCollateralizationRatio The minimum ratio of a Vault's collateral to insurance promised. 16 means 1.6.
     */
    function updateParameters(
        uint256 _liquidationIncentive,
        uint256 _liquidationFactor,
        uint256 _transactionFee,
        uint256 _minCollateralizationRatio
    ) public onlyOwner {
        require(
            _liquidationIncentive <= 200,
            "Can't have >20% liquidation incentive"
        );
        require(
            _liquidationFactor <= 1000,
            "Can't liquidate more than 100% of the vault"
        );
        require(_transactionFee <= 100, "Can't have transaction fee > 10%");
        require(
            _minCollateralizationRatio >= 10,
            "Can't have minCollateralizationRatio < 1"
        );

        liquidationIncentive.value = _liquidationIncentive;
        liquidationFactor.value = _liquidationFactor;
        transactionFee.value = _transactionFee;
        minCollateralizationRatio.value = _minCollateralizationRatio;

        emit UpdateParameters(
            _liquidationIncentive,
            _liquidationFactor,
            _transactionFee,
            _minCollateralizationRatio,
            owner()
        );
    }

    /**
     * @notice Can only be called by owner. Used to set the name, symbol and decimals of the contract
     * @param _name The name of the contract
     * @param _symbol The symbol of the contract
     */
    function setDetails(string memory _name, string memory _symbol)
        public
        onlyOwner
    {
        name = _name;
        symbol = _symbol;
        decimals = uint8(-1 * oTokenExchangeRate.exponent);
        require(
            decimals >= 0,
            "1 oToken cannot protect less than the smallest unit of the asset"
        );
    }

    /**
     * @notice Can only be called by owner. Used to take out the protocol fees from the contract.
     * @param _address The address to send the fee to.
     */
    function transferFee(address payable _address) public onlyOwner {
        uint256 fees = totalFee;
        totalFee = 0;
        transferCollateral(_address, fees);

        emit TransferFee(_address, fees);
    }

    /**
     * @notice Checks if a `owner` has already created a Vault
     * @param owner The address of the supposed owner
     * @return true or false
     */
    function hasVault(address payable owner) public view returns (bool) {
        return vaults[owner].owned;
    }

    /**
     * @notice Creates a new empty Vault and sets the owner of the vault to be the msg.sender.
     */
    function openVault() public notExpired returns (bool) {
        require(!hasVault(msg.sender), "Vault already created");

        vaults[msg.sender] = Vault(0, 0, 0, true);
        vaultOwners.push(msg.sender);

        emit VaultOpened(msg.sender);
        return true;
    }

    /**
     * @notice If the collateral type is ETH, anyone can call this function any time before
     * expiry to increase the amount of collateral in a Vault. Will fail if ETH is not the
     * collateral asset.
     * Remember that adding ETH collateral even if no oTokens have been created can put the owner at a
     * risk of losing the collateral if an exercise event happens.
     * Ensure that you issue and immediately sell oTokens to allow the owner to earn premiums.
     * (Either call the createAndSell function in the oToken contract or batch the
     * addERC20Collateral, issueOTokens and sell transactions and ensure they happen atomically to protect
     * the end user).
     * @param vaultOwner the index of the Vault to which collateral will be added.
     */
    function addETHCollateral(address payable vaultOwner)
        public
        payable
        notExpired
        returns (uint256)
    {
        require(isETH(collateral), "ETH is not the specified collateral type");
        require(hasVault(vaultOwner), "Vault does not exist");

        emit ETHCollateralAdded(vaultOwner, msg.value, msg.sender);
        return _addCollateral(vaultOwner, msg.value);
    }

    /**
     * @notice If the collateral type is any ERC20, anyone can call this function any time before
     * expiry to increase the amount of collateral in a Vault. Can only transfer in the collateral asset.
     * Will fail if ETH is the collateral asset.
     * The user has to allow the contract to handle their ERC20 tokens on his behalf before these
     * functions are called.
     * Remember that adding ERC20 collateral even if no oTokens have been created can put the owner at a
     * risk of losing the collateral. Ensure that you issue and immediately sell the oTokens!
     * (Either call the createAndSell function in the oToken contract or batch the
     * addERC20Collateral, issueOTokens and sell transactions and ensure they happen atomically to protect
     * the end user).
     * @param vaultOwner the index of the Vault to which collateral will be added.
     * @param amt the amount of collateral to be transferred in.
     */
    function addERC20Collateral(address payable vaultOwner, uint256 amt)
        public
        notExpired
        returns (uint256)
    {
        require(
            collateral.transferFrom(msg.sender, address(this), amt),
            "Could not transfer in collateral tokens"
        );
        require(hasVault(vaultOwner), "Vault does not exist");

        emit ERC20CollateralAdded(vaultOwner, amt, msg.sender);
        return _addCollateral(vaultOwner, amt);
    }

    /**
     * @notice Returns the amount of underlying to be transferred during an exercise call
     */
    function underlyingRequiredToExercise(uint256 oTokensToExercise)
        public
        view
        returns (uint256)
    {
        uint64 underlyingPerOTokenExp = uint64(
            oTokenExchangeRate.exponent - underlyingExp
        );
        return oTokensToExercise.mul(10**underlyingPerOTokenExp);
    }

    /**
     * @notice Returns true if exercise can be called
     */
    function isExerciseWindow() public view returns (bool) {
        return ((block.timestamp >= expiry.sub(windowSize)) &&
            (block.timestamp < expiry));
    }

    /**
     * @notice Returns true if the oToken contract has expired
     */
    function hasExpired() public view returns (bool) {
        return (block.timestamp >= expiry);
    }

    /**
     * @notice Called by anyone holding the oTokens and underlying during the
     * exercise window i.e. from `expiry - windowSize` time to `expiry` time. The caller
     * transfers in their oTokens and corresponding amount of underlying and gets
     * `strikePrice * oTokens` amount of collateral out. The collateral paid out is taken from
     * the each vault owner starting with the first and iterating until the oTokens to exercise
     * are found.
     * NOTE: This uses a for loop and hence could run out of gas if the array passed in is too big!
     * @param oTokensToExercise the number of oTokens being exercised.
     * @param vaultsToExerciseFrom the array of vaults to exercise from.
     */
    function exercise(
        uint256 oTokensToExercise,
        address payable[] memory vaultsToExerciseFrom
    ) public payable {
        for (uint256 i = 0; i < vaultsToExerciseFrom.length; i++) {
            address payable vaultOwner = vaultsToExerciseFrom[i];
            require(
                hasVault(vaultOwner),
                "Cannot exercise from a vault that doesn't exist"
            );
            Vault storage vault = vaults[vaultOwner];
            if (oTokensToExercise == 0) {
                return;
            } else if (vault.oTokensIssued >= oTokensToExercise) {
                _exercise(oTokensToExercise, vaultOwner);
                return;
            } else {
                oTokensToExercise = oTokensToExercise.sub(vault.oTokensIssued);
                _exercise(vault.oTokensIssued, vaultOwner);
            }
        }
        require(
            oTokensToExercise == 0,
            "Specified vaults have insufficient collateral"
        );
    }

    /**
     * @notice This function allows the vault owner to remove their share of underlying after an exercise
     */
    function removeUnderlying() public {
        require(hasVault(msg.sender), "Vault does not exist");
        Vault storage vault = vaults[msg.sender];

        require(vault.underlying > 0, "No underlying balance");

        uint256 underlyingToTransfer = vault.underlying;
        vault.underlying = 0;

        transferUnderlying(msg.sender, underlyingToTransfer);
        emit RemoveUnderlying(underlyingToTransfer, msg.sender);

    }

    /**
     * @notice This function is called to issue the option tokens. Remember that issuing oTokens even if they
     * haven't been sold can put the owner at a risk of not making premiums on the oTokens. Ensure that you
     * issue and immidiately sell the oTokens! (Either call the createAndSell function in the oToken contract
     * of batch the issueOTokens transaction with a sell transaction and ensure it happens atomically).
     * @dev The owner of a Vault should only be able to have a max of
     * repo.collateral * collateralToStrike / (minminCollateralizationRatio * strikePrice) tokens issued.
     * @param oTokensToIssue The number of o tokens to issue
     * @param receiver The address to send the oTokens to
     */
    function issueOTokens(uint256 oTokensToIssue, address receiver)
        public
        notExpired
    {
        //check that we're properly collateralized to mint this number, then call _mint(address account, uint256 amount)
        require(hasVault(msg.sender), "Vault does not exist");

        Vault storage vault = vaults[msg.sender];

        // checks that the vault is sufficiently collateralized
        uint256 newOTokensBalance = vault.oTokensIssued.add(oTokensToIssue);
        require(isSafe(vault.collateral, newOTokensBalance), "unsafe to mint");

        // issue the oTokens
        vault.oTokensIssued = newOTokensBalance;
        _mint(receiver, oTokensToIssue);

        emit IssuedOTokens(receiver, oTokensToIssue, msg.sender);
        return;
    }

    /**
     * @notice Returns the vault for a given address
     * @param vaultOwner the owner of the Vault to return
     */
    function getVault(address payable vaultOwner)
        public
        view
        returns (uint256, uint256, uint256, bool)
    {
        Vault storage vault = vaults[vaultOwner];
        return (
            vault.collateral,
            vault.oTokensIssued,
            vault.underlying,
            vault.owned
        );
    }

    /**
     * @notice Returns true if the given ERC20 is ETH.
     * @param _ierc20 the ERC20 asset.
     */
    function isETH(IERC20 _ierc20) public pure returns (bool) {
        return _ierc20 == IERC20(0);
    }

    /**
     * @notice allows the owner to burn their oTokens to increase the collateralization ratio of
     * their vault.
     * @param amtToBurn number of oTokens to burn
     * @dev only want to call this function before expiry. After expiry, no benefit to calling it.
     */
    function burnOTokens(uint256 amtToBurn) public notExpired {
        require(hasVault(msg.sender), "Vault does not exist");

        Vault storage vault = vaults[msg.sender];

        vault.oTokensIssued = vault.oTokensIssued.sub(amtToBurn);
        _burn(msg.sender, amtToBurn);

        emit BurnOTokens(msg.sender, amtToBurn);
    }

    /**
     * @notice allows the owner to remove excess collateral from the vault before expiry. Removing collateral lowers
     * the collateralization ratio of the vault.
     * @param amtToRemove Amount of collateral to remove in 10^-18.
     */
    function removeCollateral(uint256 amtToRemove) public notExpired {
        require(amtToRemove > 0, "Cannot remove 0 collateral");
        require(hasVault(msg.sender), "Vault does not exist");

        Vault storage vault = vaults[msg.sender];
        require(
            amtToRemove <= getCollateral(msg.sender),
            "Can't remove more collateral than owned"
        );

        // check that vault will remain safe after removing collateral
        uint256 newCollateralBalance = vault.collateral.sub(amtToRemove);

        require(
            isSafe(newCollateralBalance, vault.oTokensIssued),
            "Vault is unsafe"
        );

        // remove the collateral
        vault.collateral = newCollateralBalance;
        transferCollateral(msg.sender, amtToRemove);

        emit RemoveCollateral(amtToRemove, msg.sender);
    }

    /**
     * @notice after expiry, each vault holder can get back their proportional share of collateral
     * from vaults that they own.
     * @dev The owner gets all of their collateral back if no exercise event took their collateral.
     */
    function redeemVaultBalance() public {
        require(hasExpired(), "Can't collect collateral until expiry");
        require(hasVault(msg.sender), "Vault does not exist");

        // pay out owner their share
        Vault storage vault = vaults[msg.sender];

        // To deal with lower precision
        uint256 collateralToTransfer = vault.collateral;
        uint256 underlyingToTransfer = vault.underlying;

        vault.collateral = 0;
        vault.oTokensIssued = 0;
        vault.underlying = 0;

        transferCollateral(msg.sender, collateralToTransfer);
        transferUnderlying(msg.sender, underlyingToTransfer);

        emit RedeemVaultBalance(
            collateralToTransfer,
            underlyingToTransfer,
            msg.sender
        );
    }

    /**
     * This function returns the maximum amount of collateral liquidatable if the given vault is unsafe
     * @param vaultOwner The index of the vault to be liquidated
     */
    function maxOTokensLiquidatable(address payable vaultOwner)
        public
        view
        returns (uint256)
    {
        if (isUnsafe(vaultOwner)) {
            Vault storage vault = vaults[vaultOwner];
            uint256 maxCollateralLiquidatable = vault
                .collateral
                .mul(liquidationFactor.value)
                .div(10**uint256(-liquidationFactor.exponent));

            uint256 one = 10**uint256(-liquidationIncentive.exponent);
            Number memory liqIncentive = Number(
                liquidationIncentive.value.add(one),
                liquidationIncentive.exponent
            );
            return calculateOTokens(maxCollateralLiquidatable, liqIncentive);
        } else {
            return 0;
        }
    }

    /**
     * @notice This function can be called by anyone who notices a vault is undercollateralized.
     * The caller gets a reward for reducing the amount of oTokens in circulation.
     * @dev Liquidator comes with _oTokens. They get _oTokens * strikePrice * (incentive + fee)
     * amount of collateral out. They can liquidate a max of liquidationFactor * vault.collateral out
     * in one function call i.e. partial liquidations.
     * @param vaultOwner The index of the vault to be liquidated
     * @param oTokensToLiquidate The number of oTokens being taken out of circulation
     */
    function liquidate(address payable vaultOwner, uint256 oTokensToLiquidate)
        public
        notExpired
    {
        require(hasVault(vaultOwner), "Vault does not exist");

        Vault storage vault = vaults[vaultOwner];

        // cannot liquidate a safe vault.
        require(isUnsafe(vaultOwner), "Vault is safe");

        // Owner can't liquidate themselves
        require(msg.sender != vaultOwner, "Owner can't liquidate themselves");

        uint256 amtCollateral = calculateCollateralToPay(
            oTokensToLiquidate,
            Number(1, 0)
        );
        uint256 amtIncentive = calculateCollateralToPay(
            oTokensToLiquidate,
            liquidationIncentive
        );
        uint256 amtCollateralToPay = amtCollateral.add(amtIncentive);

        // calculate the maximum amount of collateral that can be liquidated
        uint256 maxCollateralLiquidatable = vault.collateral.mul(
            liquidationFactor.value
        );

        if (liquidationFactor.exponent > 0) {
            maxCollateralLiquidatable = maxCollateralLiquidatable.mul(
                10**uint256(liquidationFactor.exponent)
            );
        } else {
            maxCollateralLiquidatable = maxCollateralLiquidatable.div(
                10**uint256(-1 * liquidationFactor.exponent)
            );
        }

        require(
            amtCollateralToPay <= maxCollateralLiquidatable,
            "Can only liquidate liquidation factor at any given time"
        );

        // deduct the collateral and oTokensIssued
        vault.collateral = vault.collateral.sub(amtCollateralToPay);
        vault.oTokensIssued = vault.oTokensIssued.sub(oTokensToLiquidate);

        // transfer the collateral and burn the _oTokens
        _burn(msg.sender, oTokensToLiquidate);
        transferCollateral(msg.sender, amtCollateralToPay);

        emit Liquidate(amtCollateralToPay, vaultOwner, msg.sender);
    }

    /**
     * @notice checks if a vault is unsafe. If so, it can be liquidated
     * @param vaultOwner The number of the vault to check
     * @return true or false
     */
    function isUnsafe(address payable vaultOwner) public view returns (bool) {
        bool stillUnsafe = !isSafe(
            getCollateral(vaultOwner),
            getOTokensIssued(vaultOwner)
        );
        return stillUnsafe;
    }

    /**
     * @notice This function returns if an -30 <= exponent <= 30
     */
    function isWithinExponentRange(int32 val) internal pure returns (bool) {
        return ((val <= 30) && (val >= -30));
    }

    /**
     * @notice This function calculates and returns the amount of collateral in the vault
    */
    function getCollateral(address payable vaultOwner)
        internal
        view
        returns (uint256)
    {
        Vault storage vault = vaults[vaultOwner];
        return vault.collateral;
    }

    /**
     * @notice This function calculates and returns the amount of puts issued by the Vault
    */
    function getOTokensIssued(address payable vaultOwner)
        internal
        view
        returns (uint256)
    {
        Vault storage vault = vaults[vaultOwner];
        return vault.oTokensIssued;
    }

    /**
     * @notice Called by anyone holding the oTokens and underlying during the
     * exercise window i.e. from `expiry - windowSize` time to `expiry` time. The caller
     * transfers in their oTokens and corresponding amount of underlying and gets
     * `strikePrice * oTokens` amount of collateral out. The collateral paid out is taken from
     * the specified vault holder. At the end of the expiry window, the vault holder can redeem their balance
     * of collateral. The vault owner can withdraw their underlying at any time.
     * The user has to allow the contract to handle their oTokens and underlying on his behalf before these functions are called.
     * @param oTokensToExercise the number of oTokens being exercised.
     * @param vaultToExerciseFrom the address of the vaultOwner to take collateral from.
     * @dev oTokenExchangeRate is the number of underlying tokens that 1 oToken protects.
     */
    function _exercise(
        uint256 oTokensToExercise,
        address payable vaultToExerciseFrom
    ) internal {
        // 1. before exercise window: revert
        require(
            isExerciseWindow(),
            "Can't exercise outside of the exercise window"
        );

        require(hasVault(vaultToExerciseFrom), "Vault does not exist");

        Vault storage vault = vaults[vaultToExerciseFrom];
        require(oTokensToExercise > 0, "Can't exercise 0 oTokens");
        // Check correct amount of oTokens passed in)
        require(
            oTokensToExercise <= vault.oTokensIssued,
            "Can't exercise more oTokens than the owner has"
        );
        // Ensure person calling has enough oTokens
        require(
            balanceOf(msg.sender) >= oTokensToExercise,
            "Not enough oTokens"
        );

        // 1. Check sufficient underlying
        // 1.1 update underlying balances
        uint256 amtUnderlyingToPay = underlyingRequiredToExercise(
            oTokensToExercise
        );
        vault.underlying = vault.underlying.add(amtUnderlyingToPay);

        // 2. Calculate Collateral to pay
        // 2.1 Payout enough collateral to get (strikePrice * oTokens) amount of collateral
        uint256 amtCollateralToPay = calculateCollateralToPay(
            oTokensToExercise,
            Number(1, 0)
        );

        // 2.2 Take a small fee on every exercise
        uint256 amtFee = calculateCollateralToPay(
            oTokensToExercise,
            transactionFee
        );
        totalFee = totalFee.add(amtFee);

        uint256 totalCollateralToPay = amtCollateralToPay.add(amtFee);
        require(
            totalCollateralToPay <= vault.collateral,
            "Vault underwater, can't exercise"
        );

        // 3. Update collateral + oToken balances
        vault.collateral = vault.collateral.sub(totalCollateralToPay);
        vault.oTokensIssued = vault.oTokensIssued.sub(oTokensToExercise);

        // 4. Transfer in underlying, burn oTokens + pay out collateral
        // 4.1 Transfer in underlying
        if (isETH(underlying)) {
            require(msg.value == amtUnderlyingToPay, "Incorrect msg.value");
        } else {
            require(
                underlying.transferFrom(
                    msg.sender,
                    address(this),
                    amtUnderlyingToPay
                ),
                "Could not transfer in tokens"
            );
        }
        // 4.2 burn oTokens
        _burn(msg.sender, oTokensToExercise);

        // 4.3 Pay out collateral
        transferCollateral(msg.sender, amtCollateralToPay);

        emit Exercise(
            amtUnderlyingToPay,
            amtCollateralToPay,
            msg.sender,
            vaultToExerciseFrom
        );

    }

    /**
     * @notice adds `_amt` collateral to `vaultOwner` and returns the new balance of the vault
     * @param vaultOwner the index of the vault
     * @param amt the amount of collateral to add
     */
    function _addCollateral(address payable vaultOwner, uint256 amt)
        internal
        notExpired
        returns (uint256)
    {
        Vault storage vault = vaults[vaultOwner];
        vault.collateral = vault.collateral.add(amt);

        return vault.collateral;
    }

    /**
     * @notice checks if a hypothetical vault is safe with the given collateralAmt and oTokensIssued
     * @param collateralAmt The amount of collateral the hypothetical vault has
     * @param oTokensIssued The amount of oTokens generated by the hypothetical vault
     * @return true or false
     */
    function isSafe(uint256 collateralAmt, uint256 oTokensIssued)
        internal
        view
        returns (bool)
    {
        // get price from Oracle
        uint256 collateralToEthPrice = getPrice(address(collateral));
        uint256 strikeToEthPrice = getPrice(address(strike));

        // check `oTokensIssued * minCollateralizationRatio * strikePrice <= collAmt * collateralToStrikePrice`
        uint256 leftSideVal = oTokensIssued
            .mul(minCollateralizationRatio.value)
            .mul(strikePrice.value);
        int32 leftSideExp = minCollateralizationRatio.exponent +
            strikePrice.exponent;

        uint256 rightSideVal = (collateralAmt.mul(collateralToEthPrice)).div(
            strikeToEthPrice
        );
        int32 rightSideExp = collateralExp;

        uint256 exp = 0;
        bool stillSafe = false;

        if (rightSideExp < leftSideExp) {
            exp = uint256(leftSideExp - rightSideExp);
            stillSafe = leftSideVal.mul(10**exp) <= rightSideVal;
        } else {
            exp = uint256(rightSideExp - leftSideExp);
            stillSafe = leftSideVal <= rightSideVal.mul(10**exp);
        }

        return stillSafe;
    }

    /**
     * This function returns the maximum amount of oTokens that can safely be issued against the specified amount of collateral.
     * @param collateralAmt The amount of collateral against which oTokens will be issued.
     */
    function maxOTokensIssuable(uint256 collateralAmt)
        public
        view
        returns (uint256)
    {
        return calculateOTokens(collateralAmt, minCollateralizationRatio);

    }

    /**
     * @notice This function is used to calculate the amount of tokens that can be issued.
     * @dev The amount of oTokens is determined by:
     * oTokensIssued  <= collateralAmt * collateralToStrikePrice / (proportion * strikePrice)
     * @param collateralAmt The amount of collateral
     * @param proportion The proportion of the collateral to pay out. If 100% of collateral
     * should be paid out, pass in Number(1, 0). The proportion might be less than 100% if
     * you are calculating fees.
     */
    function calculateOTokens(uint256 collateralAmt, Number memory proportion)
        internal
        view
        returns (uint256)
    {
        uint256 collateralToEthPrice = getPrice(address(collateral));
        uint256 strikeToEthPrice = getPrice(address(strike));

        // oTokensIssued  <= collAmt * collateralToStrikePrice / (proportion * strikePrice)
        uint256 denomVal = proportion.value.mul(strikePrice.value);
        int32 denomExp = proportion.exponent + strikePrice.exponent;

        uint256 numeratorVal = (collateralAmt.mul(collateralToEthPrice)).div(
            strikeToEthPrice
        );
        int32 numeratorExp = collateralExp;

        uint256 exp = 0;
        uint256 numOptions = 0;

        if (numeratorExp < denomExp) {
            exp = uint256(denomExp - numeratorExp);
            numOptions = numeratorVal.div(denomVal.mul(10**exp));
        } else {
            exp = uint256(numeratorExp - denomExp);
            numOptions = numeratorVal.mul(10**exp).div(denomVal);
        }

        return numOptions;
    }

    /**
     * @notice This function calculates the amount of collateral to be paid out.
     * @dev The amount of collateral to paid out is determined by:
     * (proportion * strikePrice * strikeToCollateralPrice * oTokens) amount of collateral.
     * @param _oTokens The number of oTokens.
     * @param proportion The proportion of the collateral to pay out. If 100% of collateral
     * should be paid out, pass in Number(1, 0). The proportion might be less than 100% if
     * you are calculating fees.
     */
    function calculateCollateralToPay(
        uint256 _oTokens,
        Number memory proportion
    ) internal view returns (uint256) {
        // Get price from oracle
        uint256 collateralToEthPrice = getPrice(address(collateral));
        uint256 strikeToEthPrice = getPrice(address(strike));

        // calculate how much should be paid out
        uint256 amtCollateralToPayInEthNum = _oTokens
            .mul(strikePrice.value)
            .mul(proportion.value)
            .mul(strikeToEthPrice);
        int32 amtCollateralToPayExp = strikePrice.exponent +
            proportion.exponent -
            collateralExp;
        uint256 amtCollateralToPay = 0;
        if (amtCollateralToPayExp > 0) {
            uint32 exp = uint32(amtCollateralToPayExp);
            amtCollateralToPay = amtCollateralToPayInEthNum.mul(10**exp).div(
                collateralToEthPrice
            );
        } else {
            uint32 exp = uint32(-1 * amtCollateralToPayExp);
            amtCollateralToPay = (amtCollateralToPayInEthNum.div(10**exp)).div(
                collateralToEthPrice
            );
        }

        return amtCollateralToPay;

    }

    /**
     * @notice This function transfers `amt` collateral to `_addr`
     * @param _addr The address to send the collateral to
     * @param _amt The amount of the collateral to pay out.
     */
    function transferCollateral(address payable _addr, uint256 _amt) internal {
        if (isETH(collateral)) {
            _addr.transfer(_amt);
        } else {
            collateral.transfer(_addr, _amt);
        }
    }

    /**
     * @notice This function transfers `amt` underlying to `_addr`
     * @param _addr The address to send the underlying to
     * @param _amt The amount of the underlying to pay out.
     */
    function transferUnderlying(address payable _addr, uint256 _amt) internal {
        if (isETH(underlying)) {
            _addr.transfer(_amt);
        } else {
            underlying.transfer(_addr, _amt);
        }
    }

    /**
     * @notice This function gets the price ETH (wei) to asset price.
     * @param asset The address of the asset to get the price of
     */
    function getPrice(address asset) internal view returns (uint256) {
        if (address(collateral) == address(strike)) {
            return 1;
        } else if (asset == address(0)) {
            return (10**18);
        } else {
            return COMPOUND_ORACLE.getPrice(asset);
        }
    }
}

// File: contracts/oToken.sol

pragma solidity 0.5.10;


/**
 * @title Opyn's Options Contract
 * @author Opyn
 */

contract oToken is OptionsContract {
    /**
    * @param _collateral The collateral asset
    * @param _collExp The precision of the collateral (-18 if ETH)
    * @param _underlying The asset that is being protected
    * @param _underlyingExp The precision of the underlying asset
    * @param _oTokenExchangeExp The precision of the `amount of underlying` that 1 oToken protects
    * @param _strikePrice The amount of strike asset that will be paid out
    * @param _strikeExp The precision of the strike asset (-18 if ETH)
    * @param _strike The asset in which the insurance is calculated
    * @param _expiry The time at which the insurance expires
    * @param _optionsExchange The contract which interfaces with the exchange + oracle
    * @param _oracleAddress The address of the oracle
    * @param _windowSize UNIX time. Exercise window is from `expiry - _windowSize` to `expiry`.
    */
    constructor(
        IERC20 _collateral,
        int32 _collExp,
        IERC20 _underlying,
        int32 _underlyingExp,
        int32 _oTokenExchangeExp,
        uint256 _strikePrice,
        int32 _strikeExp,
        IERC20 _strike,
        uint256 _expiry,
        OptionsExchange _optionsExchange,
        address _oracleAddress,
        uint256 _windowSize
    )
        public
        OptionsContract(
            _collateral,
            _collExp,
            _underlying,
            _underlyingExp,
            _oTokenExchangeExp,
            _strikePrice,
            _strikeExp,
            _strike,
            _expiry,
            _optionsExchange,
            _oracleAddress,
            _windowSize
        )
    {}

    /**
     * @notice opens a Vault, adds ETH collateral, and mints new oTokens in one step
     * Remember that creating oTokens can put the owner at a risk of losing the collateral
     * if an exercise event happens.
     * The sell function provides the owner a chance to earn premiums.
     * Ensure that you create and immediately sell oTokens atmoically.
     * @param amtToCreate number of oTokens to create
     * @param receiver address to send the Options to
     */
    function createETHCollateralOption(uint256 amtToCreate, address receiver)
        external
        payable
    {
        openVault();
        addETHCollateralOption(amtToCreate, receiver);
    }

    /**
     * @notice adds ETH collateral, and mints new oTokens in one step to an existing Vault
     * Remember that creating oTokens can put the owner at a risk of losing the collateral
     * if an exercise event happens.
     * The sell function provides the owner a chance to earn premiums.
     * Ensure that you create and immediately sell oTokens atmoically.
     * @param amtToCreate number of oTokens to create
     * @param receiver address to send the Options to
     */
    function addETHCollateralOption(uint256 amtToCreate, address receiver)
        public
        payable
    {
        addETHCollateral(msg.sender);
        issueOTokens(amtToCreate, receiver);
    }

    /**
     * @notice opens a Vault, adds ETH collateral, mints new oTokens and sell in one step
     * @param amtToCreate number of oTokens to create
     * @param receiver address to receive the premiums
     */
    function createAndSellETHCollateralOption(
        uint256 amtToCreate,
        address payable receiver
    ) external payable {
        openVault();
        addETHCollateralOption(amtToCreate, address(this));
        this.approve(address(optionsExchange), amtToCreate);
        optionsExchange.sellOTokens(
            receiver,
            address(this),
            address(0),
            amtToCreate
        );
    }

    /**
     * @notice adds ETH collateral to an existing Vault, and mints new oTokens and sells the oTokens in one step
     * @param amtToCreate number of oTokens to create
     * @param receiver address to send the Options to
     */
    function addAndSellETHCollateralOption(
        uint256 amtToCreate,
        address payable receiver
    ) public payable {
        addETHCollateral(msg.sender);
        issueOTokens(amtToCreate, address(this));
        this.approve(address(optionsExchange), amtToCreate);
        optionsExchange.sellOTokens(
            receiver,
            address(this),
            address(0),
            amtToCreate
        );
    }

    /**
     * @notice opens a Vault, adds ERC20 collateral, and mints new oTokens in one step
     * Remember that creating oTokens can put the owner at a risk of losing the collateral
     * if an exercise event happens.
     * The sell function provides the owner a chance to earn premiums.
     * Ensure that you create and immediately sell oTokens atmoically.
     * @param amtToCreate number of oTokens to create
     * @param amtCollateral amount of collateral added
     * @param receiver address to send the Options to
     */
    function createERC20CollateralOption(
        uint256 amtToCreate,
        uint256 amtCollateral,
        address receiver
    ) external {
        openVault();
        addERC20CollateralOption(amtToCreate, amtCollateral, receiver);
    }

    /**
     * @notice adds ERC20 collateral, and mints new oTokens in one step
     * Remember that creating oTokens can put the owner at a risk of losing the collateral
     * if an exercise event happens.
     * The sell function provides the owner a chance to earn premiums.
     * Ensure that you create and immediately sell oTokens atmoically.
     * @param amtToCreate number of oTokens to create
     * @param amtCollateral amount of collateral added
     * @param receiver address to send the Options to
     */
    function addERC20CollateralOption(
        uint256 amtToCreate,
        uint256 amtCollateral,
        address receiver
    ) public {
        addERC20Collateral(msg.sender, amtCollateral);
        issueOTokens(amtToCreate, receiver);
    }

    /**
     * @notice opens a Vault, adds ERC20 collateral, mints new oTokens and sells the oTokens in one step
     * @param amtToCreate number of oTokens to create
     * @param amtCollateral amount of collateral added
     * @param receiver address to send the Options to
     */
    function createAndSellERC20CollateralOption(
        uint256 amtToCreate,
        uint256 amtCollateral,
        address payable receiver
    ) external {
        openVault();
        addERC20CollateralOption(amtToCreate, amtCollateral, address(this));
        this.approve(address(optionsExchange), amtToCreate);
        optionsExchange.sellOTokens(
            receiver,
            address(this),
            address(0),
            amtToCreate
        );
    }

    /**
     * @notice adds ERC20 collateral, mints new oTokens and sells the oTokens in one step
     * @param amtToCreate number of oTokens to create
     * @param amtCollateral amount of collateral added
     * @param receiver address to send the Options to
     */
    function addAndSellERC20CollateralOption(
        uint256 amtToCreate,
        uint256 amtCollateral,
        address payable receiver
    ) public {
        addERC20Collateral(msg.sender, amtCollateral);
        issueOTokens(amtToCreate, address(this));
        this.approve(address(optionsExchange), amtToCreate);
        optionsExchange.sellOTokens(
            receiver,
            address(this),
            address(0),
            amtToCreate
        );
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://24408987c6dcfcda4c0e73ff0354366a3d057faa494c86e0ef89208047b75fda
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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