Trappist is an open-source Web3 developer playground designed for experimenting with cross-chain applications and services on the Polkadot Network. Leveraging cutting-edge technologies such as Substrate for building customizable blockchains, Cumulus for developing Substrate-based Polkadot parachains, XCM for secure cross-chain messaging, and Statemint for asset management, Trappist provides a comprehensive environment for blockchain innovation. The repository includes a feature-rich parachain and a local multi-chain setup featuring Rococo, Statemine, and Trappist parachains, pre-configured for cross-chain communication via XCM on HRMP channels. Named after the Trappist monks’ tradition of quality and integrity, this non-commercial initiative fosters knowledge sharing and experimentation in decentralized technologies.