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Doppler is an on-chain token launch protocol that helps projects launch tokens through price discovery auctions. Its core is the Airlock smart contract, providing a unified interface that supports three auction modes: static, multicurve, and dynamic, enabling tokens to discover fair market prices. After the auction concludes, liquidity can be automatically migrated to decentralized exchanges such as Uniswap. The protocol integrates OpenZeppelin Governor, supporting on-chain governance and treasury management. Its modular design allows developers to add custom modules to meet compliance or differentiation needs. Doppler offers a TypeScript SDK and application interface, supporting EVM networks and Solana.