Agent Payments Protocol (AP2)
Open protocol for agent-initiated payments, built as an extension to A2A and MCP, with signed user mandates.
Reference by Created by Google
IndexedApache-2.0★ 3,246
About
Defines how an agent proves a user authorized a purchase, including human-present and human-not-present payment flows.
Use cases: payments-billing, identity-access
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About the protocol
- Specification
- ap2-protocol.org/
- Current version
- v0.2blog.google
- Maintainer
- Created by Googlecloud.google.com
- Governance
- Donated to the FIDO Alliance (April 2026)blog.google
- Launched
- 2025-09cloud.google.com
- Developed with more than 60 organizations, including Mastercard, American Express, PayPal, Coinbase and Adyen. cloud.google.com
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Signals
- Stars
- 3,246
- Forks
- 518
- Open issues
- 88
- Last commit
- Apr 29, 2026 (6 months ago)
- Last release
- Apr 28, 2026 (6 months ago)
From GitHub (fetched Oct 24, 2026).
Details
- Version
- v0.2
- License
- Apache-2.0
- Repository
- github.com/google-agentic-commerce/AP2
- Website
- ap2-protocol.org/
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
Cite this page
Agent Payments Protocol (AP2). Agent Mart. https://agentmart.dev/reference/agent-payments-protocol (last updated 2026-10-24)