Fetch.ai is an open-source platform and software development kit designed for building autonomous agents that represent digital twins on a decentralized network. It provides a Python and Rust SDK, an Open Economic Framework (OEF) for peer discovery, and seamless integration with its ledger for secure transactions. Developers can define custom agent skills—such as market making, data provision, or task bidding—and deploy them to testnets or mainnets. Fetch.ai agents autonomously communicate, negotiate, and execute smart contracts, enabling powerful multi-agent coordination for supply chains, IoT ecosystems, mobility services, energy grids, and beyond.