Agent‑based commerce platforms and SDKs bring autonomous AI agents, developer tooling, and commerce infrastructure together to automate shopping journeys, payments orchestration, and customer experience workflows. This topic examines Visa’s unified agent commerce platform in the context of competing offerings and adjacent tools across four categories: AI agent marketplaces, agent frameworks, CX automation platforms, and AI shopping assistants. By 2026 the shift from conversational bots to agentic systems—capable of multistep actions, cross‑system orchestration, and direct interaction with payment and commerce APIs—has made unified platforms and well‑designed SDKs central to production deployments. Key vendor approaches include low‑code/no‑code agent builders (Lindy) for rapid creation and governance; enterprise CX/EX platforms (Yellow.ai, IBM watsonx Assistant) for multichannel, regulated deployments; action‑capable agent research and tooling (Adept’s ACT‑1) for automating software workflows; and marketing and commerce integrators (Katalis AI, Brevo) that combine autonomous agents with CRM, email/SMS and campaign automation. Niche tools—like Gather AI for intralogistics and LandLyze for landing‑page optimization—illustrate how agentic capabilities are extending into operational and conversion optimization use cases. Evaluations should focus on: SDK extensibility, payments and identity integration, multichannel orchestration, governance and auditability, human‑in‑the‑loop controls, and marketplaces for reusable agent components. Comparing Visa’s unified commerce intent—to centralize payment and commerce primitives for agents—with competitors highlights tradeoffs between turnkey enterprise support and custom developer frameworks. For buyers, the priority is pragmatic: choose platforms and SDKs that balance automation capability, integration surface area, and governance suited to their regulatory and CX requirements.