The Free ACP Payments Module is an open-source commerce core designed to enable payments directly within Model Context Protocol (MCP) servers. It addresses the challenge of integrating payment processing into AI-driven chat environments by allowing customers to search products, build a cart, and complete payments inside a conversation with an AI assistant, such as those found in Claude or ChatGPT. By implementing the Agentic Commerce Protocol (ACP) checkout API, the module lets MCP tools function as storefronts without redirecting users to external websites.
This tool provides a drop-in library and a reference server, distributed as a single TypeScript package named mcp-commerce, which runs on Node.js 20 or newer. The core commerce logic is encapsulated in a standalone library, with two main network interfaces: an MCP server that exposes shopping tools to agents, and an ACP REST API that manages checkout sessions for agent platforms. It integrates with Stripe to process card payments and serves an ACP product feed in JSONL or CSV format, making products discoverable to platforms. The module also handles essential commerce operations such as cart state management, price calculations, checkout sessions, webhook verification, idempotency, and mapping to the ACP specification (API version 2026-04-17).
Designed for companies that operate or are developing MCP tools and wish to sell digital products, licenses, or credits within those environments, the module is particularly suited for software vendors seeking to monetize directly through AI conversations. It is intentionally not a CRM, order database, or customer history store; instead, completed orders are passed to external business systems via signed webhooks, minimizing compliance requirements and data retention within the module itself.
The Free ACP Payments Module is available under the Elastic License 2.0, with its source code accessible on GitHub. As an implementation of the Agentic Commerce Protocol, it offers a maintained, up-to-date solution for developers and companies building transactional AI experiences within MCP servers.
In the Payments infrastructure space, Free ACP Payments Module takes a focused approach. It focuses on allowing MCP servers to accept payments and integrate Stripe checkout directly into agentic AI conversations. It is built as an open-source project for AI tool developers. Free ACP Payments Module is open source under the Open Source license. It runs on API, and it can be self-hosted.
AFCommerce builds and maintains Free ACP Payments Module, and the product first shipped in 2026. Development happens publicly on GitHub with 3 commits in the last 90 days. Key capabilities include stripe integration, cart and checkout, and Agentic Commerce Protocol API. It exposes integrations via an MCP server and a public API.
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