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In parallel, the growth of Web3 has introduced a decentralized web infrastructure, yet remains largely inaccessible to non-technical users due to operational complexity, fragmented information, and security risks. In this article, we present\n                    <jats:italic toggle=\"yes\">Web3Agent<\/jats:italic>\n                    , an AI agent system that integrates LLM-based interaction with blockchain environments to enable language-driven on-chain operations. Web3Agent automatically decomposes user instructions into structured workflows, dynamically queries blockchain data and APIs, and performs multi-step operations such as asset transfers, token swaps, and smart contract execution. Web3Agent incorporates real-time inspection, error handling, and interaction transparency across its operation log, and flow visualization components. We evaluate the system and perform ablation study with customized dataset in a simulated environment, demonstrating its feasibility in orchestrating complex Web3 tasks and highlighting implications for agent-based abstraction in decentralized systems.\n                  <\/jats:p>","DOI":"10.1145\/3777446","type":"journal-article","created":{"date-parts":[[2025,11,17]],"date-time":"2025-11-17T11:53:36Z","timestamp":1763380416000},"page":"1-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Web3Agent: Automating On-Chain Operations via Natural Language Interfaces"],"prefix":"10.1145","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3622-1302","authenticated-orcid":false,"given":"Sizheng","family":"Fan","sequence":"first","affiliation":[{"name":"University of International Business and Economics","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0912-4598","authenticated-orcid":false,"given":"Tian","family":"Min","sequence":"additional","affiliation":[{"name":"Faculty of Science and Technology, Keio University","place":["Yokohama, Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2026,2,19]]},"reference":[{"key":"e_1_3_2_2_2","unstructured":"Omar Khattab Arnav Singhvi Paridhi Maheshwari Zhiyuan Zhang Keshav Santhanam Sri Vardhamanan Saiful Haq Ashutosh Sharma Thomas T. 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