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Standards
ERC-8004: Trustless Agents
ERC-8183: Agentic Commerce
Agent2Agent (A2A)
Agent2Agent (A2A) Protocol
concepts
A2A and MCP: Detailed Comparison
Core Concepts and Components in A2A
Life of a Task
getting-started
tutorials
Tutorials
python
Python Quickstart Tutorial: Building an A2A Agent
2. Setup Your Environment
3. Agent Skills & Agent Card
4. The Agent Executor
5. Starting the Server
6. Interacting with the Server
7. Streaming & Multi-Turn Interactions (LangGraph Example)
Next Steps
What is A2A?
how-to
Agent Discovery in A2A
Enterprise Implementation of A2A
Extensions in A2A
Streaming and Asynchronous Operations for Long-Running Tasks
project
adrs
ADR-001: Leverage ProtoJSON Specification for JSON Serialization
ADR-[number]: [Title]
Changelog
Code of Conduct
A2A Community Hub
How to contribute
Agent2Agent (A2A) Governance
Maintainers
Partners
Agent2Agent (A2A) Protocol
A2A protocol roadmap
Security Policy
A2A Documentation
reference
A2A Definition/Schema
sdk
A2A SDK
Python SDK
Agent2Agent (A2A) Protocol Specification (Release Candidate v1.0)
What's New in A2A Protocol v1.0
Agent-to-UI (A2UI)
A Protocol for Agent-Driven Interfaces
concepts
How Does A2UI Compare?
A2UI Catalogs
A2UI Client-to-Server Actions
Components & Structure
Data Binding
Data Flow
Core Concepts
Transports (Message Passing)
getting-started
How Can I Use A2UI?
Quickstart: Run A2UI in 5 Minutes
What is A2UI?
Who is A2UI For?
how-to
Agent Development Guide
Client Setup Guide
Custom Component Catalogs
A2UI Renderer Implementation Guide
Theming & Styling
project
Community
A2UI Composer
How to contribute to A2UI
Roadmap
A2UI in the World
reference
Agents (Server-Side)
Component Gallery
Ecosystem Renderers
Message Types
Renderers (Client Libraries)
specification
v0_8
docs
A2UI (Agent-to-Agent UI) Extension spec
A2UI (Agent to UI) Protocol
Summary of Custom Catalog negotiation changes in A2UI v0.8
v0_9
docs
Extending A2UI with Custom Functions
A2UI (Agent-to-Agent UI) Extension spec v0.9
A2UI (Agent to UI) Protocol v0.9
A2UI Protocol Evolution Guide: v0.8.1 to v0.9
Unified Architecture & Implementation Guide
A2UI Extension for A2A Protocol <span class="version-badge stable">v0.8 — Stable</span>
A2UI Protocol <span class="version-badge stable">v0.8 — Stable</span>
A2UI Protocol <span class="version-badge draft">v0.9 — Draft</span>
Evolution Guide <span class="version-badge info">v0.8 → v0.9</span>
Agent Payments (AP2)
Agent Payments Protocol (AP2)
concepts
AP2, A2A, and MCP
UCP Translates AP2 Requirements into Reality
AP2 and x402
Life of a Transaction
Privacy and Security
getting-started
Core Concepts
Quickstart
how-to
tutorials
AP2 Sample: User Authorization using Digital Payment Credentials
Go Sample: Human-Present Card Payment (A2A)
Agent Payments Protocol Sample: Human Present Purchases with a Card
Agent Payments Protocol Sample: Human Present Purchases with x402
project
Changelog
Code of Conduct
How to Contribute
Partners
AP2 Roadmap
Security Policy
reference
A2A Extension for AP2
Frequently Asked Questions
Glossary
Agent Payments Protocol (AP2): Building a Secure and Interoperable Future for AI-Driven Payments
Universal Commerce (UCP)
advanced
Roadmap
Schema Authoring Guide
UCP and AP2
capabilities
cart
Cart Capability - MCP Binding
Cart Capability
Cart Capability - REST Binding
catalog
Catalog Lookup Capability
Catalog - MCP Binding
Catalog Capability
Catalog - REST Binding
Catalog Search Capability
checkout
Checkout Capability - A2A Binding
AP2 Mandates Extension
Buyer Consent Extension
Discount Extension
Checkout Capability - EP Binding
Fulfillment Extension
Checkout Capability - MCP Binding
Checkout Capability
Checkout Capability - REST Binding
Identity Linking Capability
Order Capability
getting-started
Core Concepts
Universal Commerce Protocol — Overview
Quick Start by Role
Versioning
payment-handlers
examples
Encrypted Credential Handler
Platform Tokenizer Payment Handler
Processor Tokenizer Payment Handler
Payment Handler Specification Guide
{Handler Name} Payment Handler
Tokenization Guide
UCP (Universal Commerce Protocol) Documentation
reference
Schema Reference
Universal Commerce Protocol (UCP) Official Specification
security
Message Signatures
x402 HTTP Payment
GitHub
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Python SDK
Python SDK
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API reference
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