Subscription Hub (Subhub) is a decentralized, AI-driven platform for communication and engagement by enabling direct, spam-free wallet-to-wallet and DID-based messaging between projects, dApps, and users, while automating content delivery via RSS feeds from social media, blogs, and updates to streamline outreach and boost retention. Its bridges Web2-style notifications with Web3's wallet authentication, incorporating AI for personalized targeting and segmentation to enhance open rates, alongside cross-chain interoperability and zero-gas messaging to eliminate costs and barriers for senders.