Token
DLP_44674644 (DLP)
ERC-20
Overview
Max Total Supply
4,722,760.687814236 DLP
Holders
8,353
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 9 Decimals)
Balance
43.66739081 DLPLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0x03d6787cdb5e12433b402a3fbed325e35fc06d44
Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x06ac33A2...F97D2d334 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
DVM
Compiler Version
v0.6.9+commit.3e3065ac
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {IFeeRateModel} from "../../libraries/FeeRateModel.sol"; import {IERC20} from "../../interfaces/IERC20.sol"; import {DVMTrader} from "./DVMTrader.sol"; import {DVMFunding} from "./DVMFunding.sol"; import {DVMVault} from "./DVMVault.sol"; /** * @title VendingMachine * * @notice VendingMachine initialization */ contract DVM is DVMTrader, DVMFunding { function init( address maintainer, address baseTokenAddress, address quoteTokenAddress, uint256 lpFeeRate, address mtFeeRateModel, uint256 i, uint256 k, bool isOpenTWAP ) external { require(!_DVM_INITIALIZED_, "DVM_INITIALIZED"); _DVM_INITIALIZED_ = true; require(baseTokenAddress != quoteTokenAddress, "BASE_QUOTE_CAN_NOT_BE_SAME"); _BASE_TOKEN_ = IERC20(baseTokenAddress); _QUOTE_TOKEN_ = IERC20(quoteTokenAddress); require(i > 0 && i <= 10**36); _I_ = i; require(k <= 10**18); _K_ = k; _LP_FEE_RATE_ = lpFeeRate; _MT_FEE_RATE_MODEL_ = IFeeRateModel(mtFeeRateModel); _MAINTAINER_ = maintainer; _IS_OPEN_TWAP_ = isOpenTWAP; if(isOpenTWAP) _BLOCK_TIMESTAMP_LAST_ = uint32(block.timestamp % 2**32); string memory connect = "_"; string memory suffix = "DLP"; name = string(abi.encodePacked(suffix, connect, addressToShortString(address(this)))); symbol = "DLP"; decimals = _BASE_TOKEN_.decimals(); // ============================== Permit ==================================== uint256 chainId; assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( // keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'), 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f, keccak256(bytes(name)), keccak256(bytes("1")), chainId, address(this) ) ); // ========================================================================== } function addressToShortString(address _addr) public pure returns (string memory) { bytes32 value = bytes32(uint256(_addr)); bytes memory alphabet = "0123456789abcdef"; bytes memory str = new bytes(8); for (uint256 i = 0; i < 4; i++) { str[i * 2] = alphabet[uint8(value[i + 12] >> 4)]; str[1 + i * 2] = alphabet[uint8(value[i + 12] & 0x0f)]; } return string(str); } // ============ Version Control ============ function version() external pure returns (string memory) { return "DVM 1.0.2"; } }
// This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol // SPDX-License-Identifier: MIT pragma solidity 0.6.9; pragma experimental ABIEncoderV2; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); function decimals() external view returns (uint8); function name() external view returns (string memory); function symbol() external view returns (string memory); /** * @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); }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; interface IWorldesCallee { function DVMSellShareCall( address sender, uint256 burnShareAmount, uint256 baseAmount, uint256 quoteAmount, bytes calldata data ) external; function DVMFlashLoanCall( address sender, uint256 baseAmount, uint256 quoteAmount, bytes calldata data ) external; function DSPFlashLoanCall( address sender, uint256 baseAmount, uint256 quoteAmount, bytes calldata data ) external; }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {SafeMath} from "./SafeMath.sol"; /** * @title DecimalMath * * @notice Functions for fixed point number with 18 decimals */ library DecimalMath { using SafeMath for uint256; uint256 internal constant ONE = 10**18; uint256 internal constant ONE2 = 10**36; function mulFloor(uint256 target, uint256 d) internal pure returns (uint256) { return target.mul(d) / (10**18); } function mulCeil(uint256 target, uint256 d) internal pure returns (uint256) { return target.mul(d).divCeil(10**18); } function divFloor(uint256 target, uint256 d) internal pure returns (uint256) { return target.mul(10**18).div(d); } function divCeil(uint256 target, uint256 d) internal pure returns (uint256) { return target.mul(10**18).divCeil(d); } function reciprocalFloor(uint256 target) internal pure returns (uint256) { return uint256(10**36).div(target); } function reciprocalCeil(uint256 target) internal pure returns (uint256) { return uint256(10**36).divCeil(target); } function powFloor(uint256 target, uint256 e) internal pure returns (uint256) { if (e == 0) { return 10 ** 18; } else if (e == 1) { return target; } else { uint p = powFloor(target, e.div(2)); p = p.mul(p) / (10**18); if (e % 2 == 1) { p = p.mul(target) / (10**18); } return p; } } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {InitializableOwnable} from "../libraries/InitializableOwnable.sol"; interface IFeeRateImpl { function getFeeRate(address pool, address trader) external view returns (uint256); } interface IFeeRateModel { function getFeeRate(address trader) external view returns (uint256); } contract FeeRateModel is InitializableOwnable { address public feeRateImpl; function setFeeProxy(address _feeRateImpl) public onlyOwner { feeRateImpl = _feeRateImpl; } function getFeeRate(address trader) external view returns (uint256) { if(feeRateImpl == address(0)) return 0; return IFeeRateImpl(feeRateImpl).getFeeRate(msg.sender,trader); } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; /** * @title Ownable * * @notice Ownership related functions */ contract InitializableOwnable { address public _OWNER_; address public _NEW_OWNER_; bool internal _INITIALIZED_; // ============ Events ============ event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner); event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // ============ Modifiers ============ modifier notInitialized() { require(!_INITIALIZED_, "_INITIALIZED"); _; } modifier onlyOwner() { require(msg.sender == _OWNER_, "NOT_OWNER"); _; } // ============ Functions ============ function initOwner(address newOwner) public notInitialized { _INITIALIZED_ = true; _OWNER_ = newOwner; } function transferOwnership(address newOwner) public onlyOwner { emit OwnershipTransferPrepared(_OWNER_, newOwner); _NEW_OWNER_ = newOwner; } function claimOwnership() public { require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM"); emit OwnershipTransferred(_OWNER_, _NEW_OWNER_); _OWNER_ = _NEW_OWNER_; _NEW_OWNER_ = address(0); } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {SafeMath} from "../libraries/SafeMath.sol"; import {DecimalMath} from "../libraries/DecimalMath.sol"; import {WorldesMath} from "../libraries/WorldesMath.sol"; /** * @title Pricing * * @notice Worldes Pricing model */ library PMMPricing { using SafeMath for uint256; enum RState {ONE, ABOVE_ONE, BELOW_ONE} struct PMMState { uint256 i; uint256 K; uint256 B; uint256 Q; uint256 B0; uint256 Q0; RState R; } // ============ buy & sell ============ function sellBaseToken(PMMState memory state, uint256 payBaseAmount) internal pure returns (uint256 receiveQuoteAmount, RState newR) { if (state.R == RState.ONE) { // case 1: R=1 // R falls below one receiveQuoteAmount = _ROneSellBaseToken(state, payBaseAmount); newR = RState.BELOW_ONE; } else if (state.R == RState.ABOVE_ONE) { uint256 backToOnePayBase = state.B0.sub(state.B); uint256 backToOneReceiveQuote = state.Q.sub(state.Q0); // case 2: R>1 // complex case, R status depends on trading amount if (payBaseAmount < backToOnePayBase) { // case 2.1: R status do not change receiveQuoteAmount = _RAboveSellBaseToken(state, payBaseAmount); newR = RState.ABOVE_ONE; if (receiveQuoteAmount > backToOneReceiveQuote) { // [Important corner case!] may enter this branch when some precision problem happens. And consequently contribute to negative spare quote amount // to make sure spare quote>=0, mannually set receiveQuote=backToOneReceiveQuote receiveQuoteAmount = backToOneReceiveQuote; } } else if (payBaseAmount == backToOnePayBase) { // case 2.2: R status changes to ONE receiveQuoteAmount = backToOneReceiveQuote; newR = RState.ONE; } else { // case 2.3: R status changes to BELOW_ONE receiveQuoteAmount = backToOneReceiveQuote.add( _ROneSellBaseToken(state, payBaseAmount.sub(backToOnePayBase)) ); newR = RState.BELOW_ONE; } } else { // state.R == RState.BELOW_ONE // case 3: R<1 receiveQuoteAmount = _RBelowSellBaseToken(state, payBaseAmount); newR = RState.BELOW_ONE; } } function sellQuoteToken(PMMState memory state, uint256 payQuoteAmount) internal pure returns (uint256 receiveBaseAmount, RState newR) { if (state.R == RState.ONE) { receiveBaseAmount = _ROneSellQuoteToken(state, payQuoteAmount); newR = RState.ABOVE_ONE; } else if (state.R == RState.ABOVE_ONE) { receiveBaseAmount = _RAboveSellQuoteToken(state, payQuoteAmount); newR = RState.ABOVE_ONE; } else { uint256 backToOnePayQuote = state.Q0.sub(state.Q); uint256 backToOneReceiveBase = state.B.sub(state.B0); if (payQuoteAmount < backToOnePayQuote) { receiveBaseAmount = _RBelowSellQuoteToken(state, payQuoteAmount); newR = RState.BELOW_ONE; if (receiveBaseAmount > backToOneReceiveBase) { receiveBaseAmount = backToOneReceiveBase; } } else if (payQuoteAmount == backToOnePayQuote) { receiveBaseAmount = backToOneReceiveBase; newR = RState.ONE; } else { receiveBaseAmount = backToOneReceiveBase.add( _ROneSellQuoteToken(state, payQuoteAmount.sub(backToOnePayQuote)) ); newR = RState.ABOVE_ONE; } } } // ============ R = 1 cases ============ function _ROneSellBaseToken(PMMState memory state, uint256 payBaseAmount) internal pure returns ( uint256 // receiveQuoteToken ) { // in theory Q2 <= targetQuoteTokenAmount // however when amount is close to 0, precision problems may cause Q2 > targetQuoteTokenAmount return WorldesMath._SolveQuadraticFunctionForTrade( state.Q0, state.Q0, payBaseAmount, state.i, state.K ); } function _ROneSellQuoteToken(PMMState memory state, uint256 payQuoteAmount) internal pure returns ( uint256 // receiveBaseToken ) { return WorldesMath._SolveQuadraticFunctionForTrade( state.B0, state.B0, payQuoteAmount, DecimalMath.reciprocalFloor(state.i), state.K ); } // ============ R < 1 cases ============ function _RBelowSellQuoteToken(PMMState memory state, uint256 payQuoteAmount) internal pure returns ( uint256 // receiveBaseToken ) { return WorldesMath._GeneralIntegrate( state.Q0, state.Q.add(payQuoteAmount), state.Q, DecimalMath.reciprocalFloor(state.i), state.K ); } function _RBelowSellBaseToken(PMMState memory state, uint256 payBaseAmount) internal pure returns ( uint256 // receiveQuoteToken ) { return WorldesMath._SolveQuadraticFunctionForTrade( state.Q0, state.Q, payBaseAmount, state.i, state.K ); } // ============ R > 1 cases ============ function _RAboveSellBaseToken(PMMState memory state, uint256 payBaseAmount) internal pure returns ( uint256 // receiveQuoteToken ) { return WorldesMath._GeneralIntegrate( state.B0, state.B.add(payBaseAmount), state.B, state.i, state.K ); } function _RAboveSellQuoteToken(PMMState memory state, uint256 payQuoteAmount) internal pure returns ( uint256 // receiveBaseToken ) { return WorldesMath._SolveQuadraticFunctionForTrade( state.B0, state.B, payQuoteAmount, DecimalMath.reciprocalFloor(state.i), state.K ); } // ============ Helper functions ============ function adjustedTarget(PMMState memory state) internal pure { if (state.R == RState.BELOW_ONE) { state.Q0 = WorldesMath._SolveQuadraticFunctionForTarget( state.Q, state.B.sub(state.B0), state.i, state.K ); } else if (state.R == RState.ABOVE_ONE) { state.B0 = WorldesMath._SolveQuadraticFunctionForTarget( state.B, state.Q.sub(state.Q0), DecimalMath.reciprocalFloor(state.i), state.K ); } } function getMidPrice(PMMState memory state) internal pure returns (uint256) { if (state.R == RState.BELOW_ONE) { uint256 R = DecimalMath.divFloor(state.Q0.mul(state.Q0).div(state.Q), state.Q); R = DecimalMath.ONE.sub(state.K).add(DecimalMath.mulFloor(state.K, R)); return DecimalMath.divFloor(state.i, R); } else { uint256 R = DecimalMath.divFloor(state.B0.mul(state.B0).div(state.B), state.B); R = DecimalMath.ONE.sub(state.K).add(DecimalMath.mulFloor(state.K, R)); return DecimalMath.mulFloor(state.i, R); } } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; /** * @title ReentrancyGuard * * @notice Protect functions from Reentrancy Attack */ contract ReentrancyGuard { // https://solidity.readthedocs.io/en/latest/control-structures.html?highlight=zero-state#scoping-and-declarations // zero-state of _ENTERED_ is false bool private _ENTERED_; modifier preventReentrant() { require(!_ENTERED_, "REENTRANT"); _ENTERED_ = true; _; _ENTERED_ = false; } }
/* SPDX-License-Identifier: Apache-2.0 This is a simplified version of OpenZepplin's SafeERC20 library */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {IERC20} from "../interfaces/IERC20.sol"; import {SafeMath} from "./SafeMath.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn( token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value) ); } function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. // A Solidity high level call has three parts: // 1. The target address is checked to verify it contains contract code // 2. The call itself is made, and success asserted // 3. The return value is decoded, which in turn checks the size of the returned data. // solhint-disable-next-line max-line-length // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = address(token).call(data); require(success, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; /** * @title SafeMath * * @notice Math operations with safety checks that revert on error */ library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "MUL_ERROR"); return c; } function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "DIVIDING_ERROR"); return a / b; } function divCeil(uint256 a, uint256 b) internal pure returns (uint256) { uint256 quotient = div(a, b); uint256 remainder = a - quotient * b; if (remainder > 0) { return quotient + 1; } else { return quotient; } } function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SUB_ERROR"); return a - b; } function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "ADD_ERROR"); return c; } function sqrt(uint256 x) internal pure returns (uint256 y) { uint256 z = x / 2 + 1; y = x; while (z < y) { y = z; z = (x / z + z) / 2; } } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {SafeMath} from "./SafeMath.sol"; import {DecimalMath} from "./DecimalMath.sol"; /** * @title WorldesMath * * @notice Functions for complex calculating. Including ONE Integration and TWO Quadratic solutions */ library WorldesMath { using SafeMath for uint256; /* Integrate worldes curve from V1 to V2 require V0>=V1>=V2>0 res = (1-k)i(V1-V2)+ikV0*V0(1/V2-1/V1) let V1-V2=delta res = i*delta*(1-k+k(V0^2/V1/V2)) i is the price of V-res trading pair support k=1 & k=0 case [round down] */ function _GeneralIntegrate( uint256 V0, uint256 V1, uint256 V2, uint256 i, uint256 k ) internal pure returns (uint256) { require(V0 > 0, "TARGET_IS_ZERO"); uint256 fairAmount = i.mul(V1.sub(V2)); // i*delta if (k == 0) { return fairAmount.div(DecimalMath.ONE); } uint256 V0V0V1V2 = DecimalMath.divFloor(V0.mul(V0).div(V1), V2); uint256 penalty = DecimalMath.mulFloor(k, V0V0V1V2); // k(V0^2/V1/V2) return DecimalMath.ONE.sub(k).add(penalty).mul(fairAmount).div(DecimalMath.ONE2); } /* Follow the integration function above i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2) Assume Q2=Q0, Given Q1 and deltaB, solve Q0 i is the price of delta-V trading pair give out target of V support k=1 & k=0 case [round down] */ function _SolveQuadraticFunctionForTarget( uint256 V1, uint256 delta, uint256 i, uint256 k ) internal pure returns (uint256) { if (k == 0) { return V1.add(DecimalMath.mulFloor(i, delta)); } // V0 = V1*(1+(sqrt-1)/2k) // sqrt = √(1+4kidelta/V1) // premium = 1+(sqrt-1)/2k // uint256 sqrt = (4 * k).mul(i).mul(delta).div(V1).add(DecimalMath.ONE2).sqrt(); if (V1 == 0) { return 0; } uint256 sqrt; uint256 ki = (4 * k).mul(i); if (ki == 0) { sqrt = DecimalMath.ONE; } else if ((ki * delta) / ki == delta) { sqrt = (ki * delta).div(V1).add(DecimalMath.ONE2).sqrt(); } else { sqrt = ki.div(V1).mul(delta).add(DecimalMath.ONE2).sqrt(); } uint256 premium = DecimalMath.divFloor(sqrt.sub(DecimalMath.ONE), k * 2).add(DecimalMath.ONE); // V0 is greater than or equal to V1 according to the solution return DecimalMath.mulFloor(V1, premium); } /* Follow the integration expression above, we have: i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2) Given Q1 and deltaB, solve Q2 This is a quadratic function and the standard version is aQ2^2 + bQ2 + c = 0, where a=1-k -b=(1-k)Q1-kQ0^2/Q1+i*deltaB c=-kQ0^2 and Q2=(-b+sqrt(b^2+4(1-k)kQ0^2))/2(1-k) note: another root is negative, abondan if deltaBSig=true, then Q2>Q1, user sell Q and receive B if deltaBSig=false, then Q2<Q1, user sell B and receive Q return |Q1-Q2| as we only support sell amount as delta, the deltaB is always negative the input ideltaB is actually -ideltaB in the equation i is the price of delta-V trading pair support k=1 & k=0 case [round down] */ function _SolveQuadraticFunctionForTrade( uint256 V0, uint256 V1, uint256 delta, uint256 i, uint256 k ) internal pure returns (uint256) { require(V0 > 0, "TARGET_IS_ZERO"); if (delta == 0) { return 0; } if (k == 0) { return DecimalMath.mulFloor(i, delta) > V1 ? V1 : DecimalMath.mulFloor(i, delta); } if (k == DecimalMath.ONE) { // if k==1 // Q2=Q1/(1+ideltaBQ1/Q0/Q0) // temp = ideltaBQ1/Q0/Q0 // Q2 = Q1/(1+temp) // Q1-Q2 = Q1*(1-1/(1+temp)) = Q1*(temp/(1+temp)) // uint256 temp = i.mul(delta).mul(V1).div(V0.mul(V0)); uint256 temp; uint256 idelta = i.mul(delta); if (idelta == 0) { temp = 0; } else if ((idelta * V1) / idelta == V1) { temp = (idelta * V1).div(V0.mul(V0)); } else { temp = delta.mul(V1).div(V0).mul(i).div(V0); } return V1.mul(temp).div(temp.add(DecimalMath.ONE)); } // calculate -b value and sig // b = kQ0^2/Q1-i*deltaB-(1-k)Q1 // part1 = (1-k)Q1 >=0 // part2 = kQ0^2/Q1-i*deltaB >=0 // bAbs = abs(part1-part2) // if part1>part2 => b is negative => bSig is false // if part2>part1 => b is positive => bSig is true uint256 part2 = k.mul(V0).div(V1).mul(V0).add(i.mul(delta)); // kQ0^2/Q1-i*deltaB uint256 bAbs = DecimalMath.ONE.sub(k).mul(V1); // (1-k)Q1 bool bSig; if (bAbs >= part2) { bAbs = bAbs - part2; bSig = false; } else { bAbs = part2 - bAbs; bSig = true; } bAbs = bAbs.div(DecimalMath.ONE); // calculate sqrt uint256 squareRoot = DecimalMath.mulFloor( DecimalMath.ONE.sub(k).mul(4), DecimalMath.mulFloor(k, V0).mul(V0) ); // 4(1-k)kQ0^2 squareRoot = bAbs.mul(bAbs).add(squareRoot).sqrt(); // sqrt(b*b+4(1-k)kQ0*Q0) // final res uint256 denominator = DecimalMath.ONE.sub(k).mul(2); // 2(1-k) uint256 numerator; if (bSig) { numerator = squareRoot.sub(bAbs); if (numerator == 0) { revert("WorldesMath: should not be zero"); } } else { numerator = bAbs.add(squareRoot); } uint256 V2 = DecimalMath.divCeil(numerator, denominator); if (V2 > V1) { return 0; } else { return V1 - V2; } } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {DVMVault} from "./DVMVault.sol"; import {DecimalMath} from "../../libraries/DecimalMath.sol"; import {IWorldesCallee} from "../../interfaces/IWorldesCallee.sol"; contract DVMFunding is DVMVault { // ============ Events ============ event BuyShares(address to, uint256 increaseShares, uint256 totalShares); event SellShares(address payer, address to, uint256 decreaseShares, uint256 totalShares); // ============ Buy & Sell Shares ============ // buy shares [round down] function buyShares(address to) external preventReentrant returns ( uint256 shares, uint256 baseInput, uint256 quoteInput ) { uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this)); uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this)); uint256 baseReserve = _BASE_RESERVE_; uint256 quoteReserve = _QUOTE_RESERVE_; baseInput = baseBalance.sub(baseReserve); quoteInput = quoteBalance.sub(quoteReserve); require(baseInput > 0, "NO_BASE_INPUT"); // Round down when withdrawing. Therefore, never be a situation occuring balance is 0 but totalsupply is not 0 // But May Happen,reserve >0 But totalSupply = 0 if (totalSupply == 0) { // case 1. initial supply shares = baseBalance; // 以免出现balance很大但shares很小的情况 // require(_QUOTE_TARGET_ > 0, "QUOTE_TARGET_IS_ZERO"); require(shares > 2001, "MINT_AMOUNT_NOT_ENOUGH"); _mint(address(0), 1001); shares -= 1001; } else if (baseReserve > 0 && quoteReserve == 0) { // case 2. supply when quote reserve is 0 shares = baseInput.mul(totalSupply).div(baseReserve); } else if (baseReserve > 0 && quoteReserve > 0) { // case 3. normal case uint256 baseInputRatio = DecimalMath.divFloor(baseInput, baseReserve); uint256 quoteInputRatio = DecimalMath.divFloor(quoteInput, quoteReserve); uint256 mintRatio = quoteInputRatio < baseInputRatio ? quoteInputRatio : baseInputRatio; shares = DecimalMath.mulFloor(totalSupply, mintRatio); } _mint(to, shares); _setReserve(baseBalance, quoteBalance); emit BuyShares(to, shares, _SHARES_[to]); } // sell shares [round down] function sellShares( uint256 shareAmount, address to, uint256 baseMinAmount, uint256 quoteMinAmount, bytes calldata data, uint256 deadline ) external preventReentrant returns (uint256 baseAmount, uint256 quoteAmount) { require(deadline >= block.timestamp, "TIME_EXPIRED"); require(shareAmount <= _SHARES_[msg.sender], "DLP_NOT_ENOUGH"); require(to != address(this), "SELL_BACK_NOT_ALLOWED"); uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this)); uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this)); uint256 totalShares = totalSupply; baseAmount = baseBalance.mul(shareAmount).div(totalShares); quoteAmount = quoteBalance.mul(shareAmount).div(totalShares); require( baseAmount >= baseMinAmount && quoteAmount >= quoteMinAmount, "WITHDRAW_NOT_ENOUGH" ); _burn(msg.sender, shareAmount); _transferBaseOut(to, baseAmount); _transferQuoteOut(to, quoteAmount); _sync(); if (data.length > 0) { IWorldesCallee(to).DVMSellShareCall( msg.sender, shareAmount, baseAmount, quoteAmount, data ); } emit SellShares(msg.sender, to, shareAmount, _SHARES_[msg.sender]); } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {ReentrancyGuard} from "../../libraries/ReentrancyGuard.sol"; import {SafeMath} from "../../libraries/SafeMath.sol"; import {WorldesMath} from "../../libraries/WorldesMath.sol"; import {DecimalMath} from "../../libraries/DecimalMath.sol"; import {IFeeRateModel} from "../../libraries/FeeRateModel.sol"; import {IERC20} from "../../interfaces/IERC20.sol"; import {PMMPricing} from "../../libraries/PMMPricing.sol"; contract DVMStorage is ReentrancyGuard { using SafeMath for uint256; bool public _IS_OPEN_TWAP_ = false; bool internal _DVM_INITIALIZED_; // ============ Core Address ============ address public _MAINTAINER_; IERC20 public _BASE_TOKEN_; IERC20 public _QUOTE_TOKEN_; uint112 public _BASE_RESERVE_; uint112 public _QUOTE_RESERVE_; uint32 public _BLOCK_TIMESTAMP_LAST_; uint256 public _BASE_PRICE_CUMULATIVE_LAST_; // ============ Shares (ERC20) ============ string public symbol; uint8 public decimals; string public name; uint256 public totalSupply; mapping(address => uint256) internal _SHARES_; mapping(address => mapping(address => uint256)) internal _ALLOWED_; // ================= Permit ====================== bytes32 public DOMAIN_SEPARATOR; // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; mapping(address => uint256) public nonces; // ============ Variables for Pricing ============ uint256 public _LP_FEE_RATE_; IFeeRateModel public _MT_FEE_RATE_MODEL_; uint256 public _K_; uint256 public _I_; // ============ Helper Functions ============ function getPMMState() public view returns (PMMPricing.PMMState memory state) { state.i = _I_; state.K = _K_; state.B = _BASE_RESERVE_; state.Q = _QUOTE_RESERVE_; state.B0 = 0; // will be calculated in adjustedTarget state.Q0 = 0; state.R = PMMPricing.RState.ABOVE_ONE; PMMPricing.adjustedTarget(state); } function getPMMStateForCall() external view returns ( uint256 i, uint256 K, uint256 B, uint256 Q, uint256 B0, uint256 Q0, uint256 R ) { PMMPricing.PMMState memory state = getPMMState(); i = state.i; K = state.K; B = state.B; Q = state.Q; B0 = state.B0; Q0 = state.Q0; R = uint256(state.R); } function getMidPrice() public view returns (uint256 midPrice) { return PMMPricing.getMidPrice(getPMMState()); } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {DVMVault} from "./DVMVault.sol"; import {SafeMath} from "../../libraries/SafeMath.sol"; import {DecimalMath} from "../../libraries/DecimalMath.sol"; import {WorldesMath} from "../../libraries/WorldesMath.sol"; import {IWorldesCallee} from "../../interfaces/IWorldesCallee.sol"; import {PMMPricing} from "../../libraries/PMMPricing.sol"; contract DVMTrader is DVMVault { using SafeMath for uint256; // ============ Events ============ event WorldesSwap( address fromToken, address toToken, uint256 fromAmount, uint256 toAmount, address trader, address receiver ); event WorldesFlashLoan( address borrower, address assetTo, uint256 baseAmount, uint256 quoteAmount ); // ============ Trade Functions ============ function sellBase(address to) external preventReentrant returns (uint256 receiveQuoteAmount) { uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this)); uint256 baseInput = baseBalance.sub(uint256(_BASE_RESERVE_)); uint256 mtFee; (receiveQuoteAmount, mtFee) = querySellBase(tx.origin, baseInput); _transferQuoteOut(to, receiveQuoteAmount); _transferQuoteOut(_MAINTAINER_, mtFee); _setReserve(baseBalance, _QUOTE_TOKEN_.balanceOf(address(this))); emit WorldesSwap( address(_BASE_TOKEN_), address(_QUOTE_TOKEN_), baseInput, receiveQuoteAmount, msg.sender, to ); } function sellQuote(address to) external preventReentrant returns (uint256 receiveBaseAmount) { uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this)); uint256 quoteInput = quoteBalance.sub(uint256(_QUOTE_RESERVE_)); uint256 mtFee; (receiveBaseAmount, mtFee) = querySellQuote(tx.origin, quoteInput); _transferBaseOut(to, receiveBaseAmount); _transferBaseOut(_MAINTAINER_, mtFee); _setReserve(_BASE_TOKEN_.balanceOf(address(this)), quoteBalance); emit WorldesSwap( address(_QUOTE_TOKEN_), address(_BASE_TOKEN_), quoteInput, receiveBaseAmount, msg.sender, to ); } function flashLoan( uint256 baseAmount, uint256 quoteAmount, address assetTo, bytes calldata data ) external preventReentrant { _transferBaseOut(assetTo, baseAmount); _transferQuoteOut(assetTo, quoteAmount); if (data.length > 0) IWorldesCallee(assetTo).DVMFlashLoanCall(msg.sender, baseAmount, quoteAmount, data); uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this)); uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this)); // no input -> pure loss require( baseBalance >= _BASE_RESERVE_ || quoteBalance >= _QUOTE_RESERVE_, "FLASH_LOAN_FAILED" ); // sell quote if (baseBalance < _BASE_RESERVE_) { uint256 quoteInput = quoteBalance.sub(uint256(_QUOTE_RESERVE_)); (uint256 receiveBaseAmount, uint256 mtFee) = querySellQuote(tx.origin, quoteInput); require(uint256(_BASE_RESERVE_).sub(baseBalance) <= receiveBaseAmount, "FLASH_LOAN_FAILED"); _transferBaseOut(_MAINTAINER_, mtFee); emit WorldesSwap( address(_QUOTE_TOKEN_), address(_BASE_TOKEN_), quoteInput, receiveBaseAmount, msg.sender, assetTo ); } // sell base if (quoteBalance < _QUOTE_RESERVE_) { uint256 baseInput = baseBalance.sub(uint256(_BASE_RESERVE_)); (uint256 receiveQuoteAmount, uint256 mtFee) = querySellBase(tx.origin, baseInput); require(uint256(_QUOTE_RESERVE_).sub(quoteBalance) <= receiveQuoteAmount, "FLASH_LOAN_FAILED"); _transferQuoteOut(_MAINTAINER_, mtFee); emit WorldesSwap( address(_BASE_TOKEN_), address(_QUOTE_TOKEN_), baseInput, receiveQuoteAmount, msg.sender, assetTo ); } _sync(); emit WorldesFlashLoan(msg.sender, assetTo, baseAmount, quoteAmount); } // ============ Query Functions ============ function querySellBase(address trader, uint256 payBaseAmount) public view returns (uint256 receiveQuoteAmount, uint256 mtFee) { (receiveQuoteAmount, ) = PMMPricing.sellBaseToken(getPMMState(), payBaseAmount); uint256 lpFeeRate = _LP_FEE_RATE_; uint256 mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(trader); mtFee = DecimalMath.mulFloor(receiveQuoteAmount, mtFeeRate); receiveQuoteAmount = receiveQuoteAmount .sub(DecimalMath.mulFloor(receiveQuoteAmount, lpFeeRate)) .sub(mtFee); } function querySellQuote(address trader, uint256 payQuoteAmount) public view returns (uint256 receiveBaseAmount, uint256 mtFee) { (receiveBaseAmount, ) = PMMPricing.sellQuoteToken(getPMMState(), payQuoteAmount); uint256 lpFeeRate = _LP_FEE_RATE_; uint256 mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(trader); mtFee = DecimalMath.mulFloor(receiveBaseAmount, mtFeeRate); receiveBaseAmount = receiveBaseAmount .sub(DecimalMath.mulFloor(receiveBaseAmount, lpFeeRate)) .sub(mtFee); } }
/* SPDX-License-Identifier: Apache-2.0 */ pragma solidity 0.6.9; pragma experimental ABIEncoderV2; import {IERC20} from "../../interfaces/IERC20.sol"; import {SafeMath} from "../../libraries/SafeMath.sol"; import {DecimalMath} from "../../libraries/DecimalMath.sol"; import {SafeERC20} from "../../libraries/SafeERC20.sol"; import {DVMStorage} from "./DVMStorage.sol"; contract DVMVault is DVMStorage { using SafeMath for uint256; using SafeERC20 for IERC20; // ============ Events ============ event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); event Mint(address indexed user, uint256 value); event Burn(address indexed user, uint256 value); // ============ View Functions ============ function getVaultReserve() external view returns (uint256 baseReserve, uint256 quoteReserve) { baseReserve = _BASE_RESERVE_; quoteReserve = _QUOTE_RESERVE_; } function getUserFeeRate(address user) external view returns (uint256 lpFeeRate, uint256 mtFeeRate) { lpFeeRate = _LP_FEE_RATE_; mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(user); } // ============ Asset In ============ function getBaseInput() public view returns (uint256 input) { return _BASE_TOKEN_.balanceOf(address(this)).sub(uint256(_BASE_RESERVE_)); } function getQuoteInput() public view returns (uint256 input) { return _QUOTE_TOKEN_.balanceOf(address(this)).sub(uint256(_QUOTE_RESERVE_)); } // ============ TWAP UPDATE =========== function _twapUpdate() internal { uint32 blockTimestamp = uint32(block.timestamp % 2**32); uint32 timeElapsed = blockTimestamp - _BLOCK_TIMESTAMP_LAST_; if (timeElapsed > 0 && _BASE_RESERVE_ != 0 && _QUOTE_RESERVE_ != 0) { _BASE_PRICE_CUMULATIVE_LAST_ += getMidPrice() * timeElapsed; } _BLOCK_TIMESTAMP_LAST_ = blockTimestamp; } // ============ Set States ============ function _setReserve(uint256 baseReserve, uint256 quoteReserve) internal { require(baseReserve <= uint112(-1) && quoteReserve <= uint112(-1), "OVERFLOW"); _BASE_RESERVE_ = uint112(baseReserve); _QUOTE_RESERVE_ = uint112(quoteReserve); if(_IS_OPEN_TWAP_) _twapUpdate(); } function _sync() internal { uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this)); uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this)); require(baseBalance <= uint112(-1) && quoteBalance <= uint112(-1), "OVERFLOW"); if (baseBalance != _BASE_RESERVE_) { _BASE_RESERVE_ = uint112(baseBalance); } if (quoteBalance != _QUOTE_RESERVE_) { _QUOTE_RESERVE_ = uint112(quoteBalance); } if(_IS_OPEN_TWAP_) _twapUpdate(); } function sync() external preventReentrant { _sync(); } // ============ Asset Out ============ function _transferBaseOut(address to, uint256 amount) internal { if (amount > 0) { _BASE_TOKEN_.safeTransfer(to, amount); } } function _transferQuoteOut(address to, uint256 amount) internal { if (amount > 0) { _QUOTE_TOKEN_.safeTransfer(to, amount); } } // ============ Shares (ERC20) ============ /** * @dev transfer token for a specified address * @param to The address to transfer to. * @param amount The amount to be transferred. */ function transfer(address to, uint256 amount) public returns (bool) { require(amount <= _SHARES_[msg.sender], "BALANCE_NOT_ENOUGH"); _SHARES_[msg.sender] = _SHARES_[msg.sender].sub(amount); _SHARES_[to] = _SHARES_[to].add(amount); emit Transfer(msg.sender, to, amount); return true; } /** * @dev Gets the balance of the specified address. * @param owner The address to query the the balance of. * @return balance An uint256 representing the amount owned by the passed address. */ function balanceOf(address owner) external view returns (uint256 balance) { return _SHARES_[owner]; } /** * @dev Transfer tokens from one address to another * @param from address The address which you want to send tokens from * @param to address The address which you want to transfer to * @param amount uint256 the amount of tokens to be transferred */ function transferFrom( address from, address to, uint256 amount ) public returns (bool) { require(amount <= _SHARES_[from], "BALANCE_NOT_ENOUGH"); require(amount <= _ALLOWED_[from][msg.sender], "ALLOWANCE_NOT_ENOUGH"); _SHARES_[from] = _SHARES_[from].sub(amount); _SHARES_[to] = _SHARES_[to].add(amount); _ALLOWED_[from][msg.sender] = _ALLOWED_[from][msg.sender].sub(amount); emit Transfer(from, to, amount); return true; } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * @param spender The address which will spend the funds. * @param amount The amount of tokens to be spent. */ function approve(address spender, uint256 amount) public returns (bool) { _approve(msg.sender, spender, amount); return true; } function _approve( address owner, address spender, uint256 amount ) private { _ALLOWED_[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Function to check the amount of tokens that an owner _ALLOWED_ to a spender. * @param owner address The address which owns the funds. * @param spender address The address which will spend the funds. * @return A uint256 specifying the amount of tokens still available for the spender. */ function allowance(address owner, address spender) public view returns (uint256) { return _ALLOWED_[owner][spender]; } function _mint(address user, uint256 value) internal { require(value > 1000, "MINT_INVALID"); _SHARES_[user] = _SHARES_[user].add(value); totalSupply = totalSupply.add(value); emit Mint(user, value); emit Transfer(address(0), user, value); } function _burn(address user, uint256 value) internal { _SHARES_[user] = _SHARES_[user].sub(value); totalSupply = totalSupply.sub(value); emit Burn(user, value); emit Transfer(user, address(0), value); } // ============================ Permit ====================================== function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { require(deadline >= block.timestamp, "DVM_LP: EXPIRED"); bytes32 digest = keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR, keccak256( abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline) ) ) ); address recoveredAddress = ecrecover(digest, v, r, s); require( recoveredAddress != address(0) && recoveredAddress == owner, "DVM_LP: INVALID_SIGNATURE" ); _approve(owner, spender, value); } }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.