Universal REST API MCP with built-in authentication and payments
The Web4 Agent Protocol redefines the user-web interface. It is a forward-looking, open standard designed to create a new, symbiotic relationship between users, their AI Agents (powered by LLMs), and the open web.
Modern LLMs are powerful, but they often act as a barrier between users and websites. They aggregate information, which is useful, but they lack the ability to perform meaningful actions on the user's behalf. This limits their utility and threatens the economic models that support the web's creators.
The Web4 Agent Protocol integrates with the existing web rather than replacing it, providing a standardized framework for websites to securely expose their core functionality.
This transforms AI Agents from simple information retrievers into powerful personal assistants. A user can now not only ask about flights but also book them, not just read a review but also buy the product—all through a single, secure, conversational interface.
Search engines like Google and Bing can index the public web4 agent definition file, allowing them to act as an mcp-client on the user's behalf. This enables direct interaction with websites through a chatbot or from the search results page.
Envisioned as an evolution—akin to MCP 2.0—for seamless daily web interactions, the protocol will integrate authentication and payment capabilities into the agent's core. This creates a unified experience where the agent securely manages user identity and transactions across services, becoming a trusted assistant for the user's entire web presence.
- For Users: Enjoy a seamless, unified experience. Buy products, book services, and access content from any website through your AI Agent, all while using your existing website accounts securely.
- For Publishers: Create new, direct revenue streams through microtransactions and optimized advertising, independent of site traffic. Integration is simplified by placing an intelligent gateway in front of your existing API, not by rewriting it.
- For Advertisers: Pay only for verifiably engaged user attention in a transparent, on-chain ecosystem.