**[Circle Agent Stack Open Source, Supporting Multi-Framework AI Agent Integration with Wallets and USDC Payments]** DeepFlow Tech News, July 11 — According to an official announcement from Circle (@circle), the Circle Agent Stack is now open source. Developers can add wallet, USDC payment, and on-chain operation functionalities to AI agents. It currently supports the following mainstream frameworks: OpenAI Agents SDK, Claude AI Agent SDK, LangChain, Mastra, Vercel AI SDK, and Google AI ADK. Developers can quickly get started by cloning the example code, with the project hosted on GitHub. This move is regarded by the industry as a significant advancement in the payment layer infrastructure for AI agents, potentially accelerating the large-scale adoption of Agentic AI.