Doubler is a protocol that uses the Martingale strategy to separate cost and income, achieving low buy and high sell. It increases the win rate for users who prefer risk while offering U-based investors a strategy with lower risk and similar high returns as bullish options and leverage, but with more flexible trading terms. By introducing market positive externalities, it gains extra income for the pool and aggregates market liquidity to counter high volatility, meeting the needs of risk-loving users for high returns under lower risks than traditional options and leverage markets.