What is Ethereum Push Notification Service (EPNS)? Ethereum Push Notification Service (EPNS) is a decentralized DeFi notification protocol which enables users (wallet addresses) to receive notifications. Using the protocol, any dApp, service or smart contract can send notifications to users(wallet addresses) in a platform agnostic way (mobile, tablet, web, fav. wallets, etc). The DeFi aspect of the protocol also ensures that the user receives and earns from those notifications.