Explore the possible.
Test the actual.

An HTTP payment flow for machine-to-machine requests, including one-off charges and metered sessions.

A way to request and authorize payment for an HTTP resource using the 402 response.

Cryptographically signed mandates to express and verify payment authorization for agent transactions.

A declarative format for agents to send interface components that a client renders.

An event-based connection between an agentic backend and an interactive frontend.

An MCP extension for delivering interactive interfaces from servers into host applications.

An open protocol for asking a website questions in natural language and receiving structured answers; its implementation also exposes MCP.

A common way for agents to access external tools, resources and context.

An emerging browser API proposal for websites to expose structured actions to agents.

A protocol for independent agents to discover each other, exchange tasks and collaborate.

A shared-session layer that synchronizes agent state across multiple clients.

A point-to-point protocol connecting code editors and coding agents.

A secure, scalable messaging transport for agent systems, with bindings for protocols such as A2A and MCP.

A proposal for publishing and discovering agents, tools and skills through federated catalogs with verifiable publisher metadata.

An emerging protocol suite for agent identity, description, discovery and secure messaging; some parts remain drafts.

An IETF draft for signing automated HTTP requests so a website can verify the caller’s identity.

Visa’s specification for an agent to prove its identity and commerce intent to a merchant using signed requests.

A commerce interface for agents, merchants and payment providers to exchange shopping and checkout information.

Shared commerce building blocks across product discovery, checkout and post-purchase.