Circle Agent Stack now gives builders programmatic access to a curated discovery layer for agentic services. With the new Discovery API, builders can query the full Agent Marketplace catalog through a single public endpoint, with no API key, auth, or Circle account required. Wallets, clients, agent frameworks, and apps can discover USDC-accepting services programmatically and build on top of the marketplace without starting from scratch. Try it out: http://agents.circle.com(Circle)