RAIN is a decentralized options protocol designed for the Arbitrum network. It empowers users to create and trade custom markets freely, promoting a permissionless environment for both prediction and options trading. This innovative platform allows for public markets to be resolved using an oracle agent, while private markets enable creators to serve as resolvers. The protocol enhances user experience with features like secondary trading and account abstraction, making transactions smoother and more efficient. RAIN also incorporates a deflationary token model, where 2.5% of the trading volume is utilized to buy and burn the token, adding value to the ecosystem. Governance within the protocol is managed by token holders through a decentralized autonomous organization (DAO), ensuring that the community has a voice in the decision-making process. By combining flexibility, user empowerment, and innovative features, RAIN aims to revolutionize the options trading landscape.