How EF Changes the Game Rules for AI and Blockchain through ERC-8004

Author: Zhixiong Pan Source: chainfeeds

ERC-8004 is a key standard led by the Ethereum Foundation, aimed at establishing a trustless collaboration mechanism among AI Agents in a Web3 environment. This standard is derived from the Agent-to-Agent (A2A) protocol open-sourced by Google in June 2025 and was officially proposed in August of the same year by the Ethereum Foundation's dAI team (led by Davide Crapis) in collaboration with organizations such as MetaMask and Google, with the goal of making Ethereum the default coordination and settlement platform for the AI agent economy. The final standard is expected to be officially released at Devconnect in November 2025.

The core design of ERC-8004 includes three lightweight on-chain registries:

• Identity Registry (: Bind the agent's on-chain address with its A2A profile for agent discovery. By implementing agent registration and recording relevant information in the on-chain event log, it facilitates off-chain queries.
• Reputation Registry ): Achieve efficient and low-cost reputation management through off-chain feedback scoring, on-chain storage of hashes and proofs. Each feedback includes task description, score, signature, and timestamp, allowing developers to aggregate multiple scores off-chain.
• Verification Registry (Validation Registry): Provides multiple verification modes (reputation scoring, collateral assurance, TEE proof) to ensure trustworthy task execution. Only necessary hash and status information is recorded on-chain, and verification requests and responses are completed through an event mechanism.

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The standard encourages minimizing on-chain storage, only recording core information such as events and necessary hashes, while complex logic such as scoring aggregation and task negotiation is handled off-chain. In addition, ERC-8004 is highly compatible with A2A and cross-chain ecosystems, and retains open extension interfaces, such as future payment protocols (e.g., x402) which can be seamlessly integrated with it.

Future commercial application scenarios of ERC-8004 include:

• Intelligent Agent Market Platform: Provides agency registration, matching, and mediation services. For example, UXLINK has built social intelligent agents and reputation infrastructure based on this, promoting the application of a full-chain reputation system.
• Reputation scoring and verification services: Third-party organizations can provide reputation analysis and verification services. HashKey Capital is optimistic about new business models such as AI hedge funds, and in the future, there may emerge professional decentralized credit rating services.
• Micro-payment and settlement infrastructure: Supports on-chain micro-payment for purchasing APIs, data, or computing power services through the x402 protocol. MetaMask and ConsenSys have publicly supported and integrated it into their own product stack.
• Decentralized Computing and Data Market: Combining EigenLayer re-staking or TEE mechanisms to build trustworthy AI inference and data services, ensuring service quality and achieving fair payment through reputation accumulation and verification mechanisms.

In terms of ecological development, the Ethereum Foundation's dAI team leads the development and community activities (meetings) and collaborates with Google, MetaMask, ConsenSys, and the Linux Foundation. At the same time, the community has initiated active discussions on technical improvements, including enhancing on-chain reading efficiency and preventing front-domain name attacks. Platforms such as UXLINK, Virtuals, Creatorbid, and Base are also actively exploring the implementation of ERC-8004.

In addition, community members proposed to expand AgentCard by adding AI transparency information to enhance users' understanding of agent behavior. Developer activities are frequently held, such as the developer events/Builder Program planned by the dAI team, encouraging developers within the ecosystem to create new applications around ERC-8004 and develop related tools in hackathon projects.

In terms of funding and resources, the Ethereum Foundation provides an open grant program to support the development and ecological promotion of projects related to ERC-8004. MetaMask, ConsenSys, and Google have also invested heavily in promoting this standard. HashKey Capital further pointed out that collateral verification providers and TEE service providers will become key participants in future ecological construction.

Although ERC-8004 is still in its early stages, the community faces challenges in balancing Gas costs, avoiding score centralization, ensuring privacy, and achieving cross-chain compatibility. However, its potential is enormous. As the standard matures and gains widespread adoption, ERC-8004 is expected to establish Ethereum as the infrastructure for decentralized AI settlement and collaboration, driving the entire crypto industry from a single financial use case to an AI-driven era of large-scale autonomous services. In the future, the deep integration of ERC-8004 with the x402 payment protocol will further enhance the complete agent service stack from discovery to payment, bringing richer application scenarios and strong network effects to the Ethereum network.