Huo Xing Finance reports that on May 27, OpenSea announced the launch of the Ethereum open standard ERC-8257 (Agent Tool Registry), positioning it as an “app store for AI agent tools,” enabling developers to register tools on-chain, declare access rules and pricing, and allow AI agents to autonomously discover, purchase access, and invoke tools without human intervention. OpenSea stated that ERC-8257 integrates layer-by-layer with protocols such as ERC-8004 (Agent Identity), MCP (Tool Discovery), and x402 (Payment Protocol) to form the on-chain infrastructure for AI agent operations. Currently, ERC-8257 remains in draft form, and OpenSea invites developers to contribute to refining the specification.
OpenSea Launches Ethereum Standard ERC-8257 as 'App Store for AI Agents'
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Summary
On May 27, 2026, OpenSea announced the launch of the Ethereum standard ERC-8257, calling it the "app store for AI agents." The standard enables developers to register tools on-chain, define access rules and pricing, and allows AI agents to automatically discover, pay for, and utilize these tools. OpenSea stated that ERC-8257 is compatible with ERC-8004, MCP, and x402 to support AI agent operations on Ethereum. The draft is currently open for developer feedback. This update brings new AI and crypto news and underscores developments in the Ethereum ecosystem.
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