The new public endpoint adds a searchable layer to Circle's Agent Stack, letting autonomous software discover compliant services without human intervention. What the Discovery API actually doesThe API works as a public endpoint, meaning AI agents can query it without user authentication. AdvertisementThe Discovery API builds on Circle’s Agent Stack, which launched on May 11 alongside the company’s Q1 2026 earnings. Every service in the Agent Marketplace undergoes screening for sanctions compliance and operational health before it’s discoverable through the API. Developers building on any of those chains can integrate the Discovery API without migrating their existing stack.