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The deployment of autonomous AI agents capable of executing commercial transactions has motivated the adoption of mandate-based payment authorization protocols, including the Universal Commerce Protocol (UCP) and the Agent Payments Protocol…

Cryptography and Security · Computer Science 2026-02-09 Qianlong Lan , Anuj Kaul , Shaun Jones , Stephanie Westrum

The rapid proliferation of autonomous AI agents is driving a shift toward agentic commerce, where agents are expected to autonomously invoke and pay for services. While blockchain-based payments offer a programmable foundation for such…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-03-20 Yue Li , Lei Wang , Kaixuan Wang , Zhiqiang Yang , Ke Wang , Zhi Guan , Jianbo Gao

The x402 protocol revives the HTTP 402 Payment Required status code to enable web-native micropayments across APIs, content, and agents. It combines synchronous HTTP authorization with asynchronous blockchain settlement and introduces a…

Cryptography and Security · Computer Science 2026-05-13 Zelin Li , Qin Wang , Zhipeng Wang

AI agents that pay for resources via the x402 protocol embed payment metadata - resource URLs, descriptions, and reason strings - in every HTTP payment request. This metadata is transmitted to the payment server and to the centralised…

Cryptography and Security · Computer Science 2026-04-14 Vladimir Stantchev

Large language model (LLM) based agents are increasingly used to automate financial transactions, yet their reliance on contextual reasoning exposes payment systems to prompt-driven manipulation. The Agent Payments Protocol (AP2) aims to…

Cryptography and Security · Computer Science 2026-05-20 Tanusree Debi , Wentian Zhu , Pranjol Sen Gupta

As AI agents increasingly perform economic tasks on behalf of humans, a fundamental tension arises between agent autonomy and human control over financial assets. We present the Agent Economic Sovereignty Protocol (AESP), a layered protocol…

Cryptography and Security · Computer Science 2026-03-03 Jian Sheng Wang

We introduce the AI Productivity Index for Agents (APEX-Agents), a benchmark for assessing whether AI agents can execute long-horizon, cross-application tasks created by investment banking analysts, management consultants, and corporate…

Current blockchain Layer 2 solutions, including Optimism, Arbitrum, zkSync, and their derivatives, optimize for human-initiated financial transactions. Autonomous AI agents instead generate high-frequency, semantically rich service…

Multiagent Systems · Computer Science 2026-04-24 Anbang Ruan , Xing Zhang

Agentic AI rivals human capabilities across a wide range of domains. Looking ahead, it is foreseeable that AI agents will autonomously handle complex workflows and interactions. Early prototypes of this paradigm are emerging, e.g., OpenClaw…

Agentic payment systems extend delegated action to financial transfers, but scaling them on stablecoin rails in regulated settings requires safeguards that remain effective when humans are not continuously in the loop. We present a…

Cryptography and Security · Computer Science 2026-05-04 Kenneth See , Xue Wen Tan

General-purpose technologies reshape economies less by improving individual tools than by enabling new ways to organize production and coordination. We believe AI agents are approaching a similar inflection point: as foundation models make…

This research article presents a novel architecture to empower multi-agent economies by addressing two critical limitations of the emerging Agent2Agent (A2A) communication protocol: decentralized agent discoverability and agent-to-agent…

Multiagent Systems · Computer Science 2026-05-06 Awid Vaziry , Sandro Rodriguez Garzon , Axel Küpper

Autonomous agents increasingly interact with the web, yet most websites remain designed for human browsers -- a fundamental mismatch that the emerging ``Agentic Web'' must resolve. Agents must repeatedly browse pages, inspect DOMs, and…

Emerging Technologies · Computer Science 2026-04-02 Lewis Tham , Nicholas Mac Gregor Garcia , Jungpil Hahn

The rise of Large Language Models (LLMs) has transformed AI agents from passive computational tools into autonomous economic actors. This shift marks the emergence of the agent-centric economy, in which agents take on active economic…

Artificial Intelligence · Computer Science 2025-07-08 Yingxuan Yang , Ying Wen , Jun Wang , Weinan Zhang

Advances in large language models have enabled agentic AI systems that can reason, plan, and interact with external tools to execute multi-step workflows, while public blockchains have evolved into a programmable substrate for value…

Artificial Intelligence · Computer Science 2026-01-09 Saad Alqithami

As the "agentic web" takes shape-billions of AI agents (often LLM-powered) autonomously transacting and collaborating-trust shifts from human oversight to protocol design. In 2025, several inter-agent protocols crystallized this shift,…

Human-Computer Interaction · Computer Science 2025-11-06 Botao 'Amber' Hu , Helena Rong

LLM agents have shown strong performance across a wide range of complex tasks, including interactive environments that require long-horizon decision making. But these agents cannot learn on the fly at test time. Self-evolving agents address…

Machine Learning · Computer Science 2026-05-21 Yibo Li , Jiashuo Yang , Zhi Zheng , Zhiyuan Hu , Yuan Sui , Shizun Wang , Yufei He , Bryan Hooi

Artificial intelligence (AI) agents are increasingly capable of initiating financial transactions on behalf of users or other agents. This evolution introduces a fundamental challenge: verifying both the authenticity of an autonomous agent…

Cryptography and Security · Computer Science 2025-11-21 Vivek Acharya

AI agents, autonomous digital actors, need agent-native protocols; existing methods include GUI automation and MCP-based skills, with defects of high token consumption, fragmented interaction, inadequate security, due to lacking a unified…

Artificial Intelligence · Computer Science 2026-04-07 Xu Mingze

The A2AS framework is introduced as a security layer for AI agents and LLM-powered applications, similar to how HTTPS secures HTTP. A2AS enforces certified behavior, activates model self-defense, and ensures context window integrity. It…

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