ZK Coprocessors allow smart contracts to trustlessly read historical on-chain states/tx/events and run customizable computations on top at low cost, enabling data-driven dApp UX. We give a step-by-step tutorial on how to build this new kind of dApps with no knowledge of ZK circuit development. Audience will understand what a ZK Coprocessor is and why it enables new data-driven dApp features. Understand how to build these without ZK circuit dev know-how.