Protocols for the Agentic Web
As of 2025, the agentic web is powered by open standards that allow AI agents to discover, interact with, and transact on websites. These protocols, including the Universal Commerce Protocol (UCP) and the Agent Payments Protocol (AP2), provide the machine-readable SEO layer necessary for AI search engines to navigate the internet. By leveraging these standards alongside Sitemaps, businesses can transform static sites into actionable commerce profiles that support autonomous AI transactions and secure payment mandates.
What are the primary protocols for AI agents?
The agentic web relies on a stack of standards that facilitate discovery, commerce, and tool integration for large language models (LLMs).
* Universal Commerce Protocol (UCP) for commerce profile discovery.
* Agent Payments Protocol (AP2) for cryptographically signed payments.
* Agentic discovery standards for mapping the site surface.
* Model Context Protocol (MCP) for LLM tool integration.
How does the Universal Commerce Protocol (UCP) work?
UCP turns standard websites into discoverable commerce profiles that any AI agent can read and act upon.
* Converts site data into a structured commerce profile.
* Enables autonomous agents to interpret product and service offerings.
* Standardizes commerce interactions for machine-to-machine engagement.
* Facilitates deep discovery through the Universal Commerce Protocol (UCP).
What is the Agent Payments Protocol (AP2)?
AP2 enables AI agents to execute financial transactions on behalf of users using verifiable, cryptographically signed mandates.
* Utilizes signed mandates to verify user intent.
* Allows agents to pay for goods and services securely.
* Ensures all agent-led transactions are cryptographically verifiable.
* Detailed specifications are available in the Agent Payments Protocol (AP2).
How do AI agents discover web content?
Agents follow a standardized discovery surface to map available actions and content on a domain before interacting.
* Checks for llms.txt files for model-specific instructions.
* Scans .well-known endpoints for protocol configurations.
* Processes existing Sitemaps to index site architecture.
* Identifies actionable endpoints for autonomous commerce.
What is the Model Context Protocol (MCP)?
The Model Context Protocol defines a standard interface that connects LLMs to the specific tools, data, and context they require to perform tasks.
* Establishes a standard interface between models and tools.
* Provides agents with necessary data context for execution.
* Streamlines how LLMs access external software environments.
* Implementation details can be found in MCP explained.
*
Related resources: