Pendulum Protocol (hereinafter referred to as PEND) is a secure and scalable layer-2 protocol for decentralized databases. It provides unlimited verifiable decentralized data oracle and computing oracle services for mainstream blockchains. Smart contracts are connected to off-chain Internet data and provide unlimited verifiable computing power. Developers and Dapp companies using Pendulum Protocol consume data through public smart contract data points, rather than based on a centralized oracle that is separated from the blockchain. In this way, Dapp ensures security while utilizing existing data on the Internet, builds a bridge between Web 2.0 and Web 3.0 use cases, and empowers more commercial applications in the real world.