Chain.fm is a blockchain activity monitoring platform focused on helping users track on-chain wallet movements and transaction information. It offers subscribable channels, allowing users to follow channels created by others or create their own to monitor multiple wallet addresses in batches. The platform supports public chains such as Solana, BNB Chain, and Base, providing real-time monitoring, custom alerts, multi-chain data aggregation, and community sharing features. Its core mechanism is subscription and notification based on wallet addresses, lowering the technical barrier to on-chain data monitoring.