Agent Payments Protocol (AP2)

Definition

A protocol of signed mandates that record what a user authorised an agent to buy and pay, now standardised in FIDO Alliance working groups.

Example

Google donated AP2 to the FIDO Alliance in April 2026. fidoalliance.org, read 4 Nov 2026.

Where it appears in the sourced facts

• Google announced AP2 on 16 Sep 2025 with more than 60 collaborating organisations, as an extension usable with A2A and MCP. cloud.google.com, read 4 Nov 2026. In Agent Payments Protocol (AP2).
• The AP2 GitHub repository published v0.1.0 on 16 Sep 2025 and v0.2.0 on 28 Apr 2026. github.com, read 4 Nov 2026. In Agent Payments Protocol (AP2).
• The FIDO Alliance formed an Agentic Authentication Technical Working Group and a Payments Technical Working Group on 28 Apr 2026, building on Google's AP2 and Mastercard's Verifiable Intent contributions. fidoalliance.org, read 4 Nov 2026. In Agent Payments Protocol (AP2).
• FIDO published "Google donates Agent Payments Protocol to FIDO Alliance" on 29 Apr 2026, noting AP2 v0.2 added Human Not Present payments on pre-authorised instructions. fidoalliance.org, read 4 Nov 2026. In Agent Payments Protocol (AP2).
• The current AP2 site defines a Checkout Mandate (items and purchase details, shared with the merchant) and a Payment Mandate (authorisation against an instrument, shared with credential provider, network and processor), each with open and closed stages. ap2-protocol.org, read 4 Nov 2026. In Agent Payments Protocol (AP2).

Nearby terms

• Mandate
• Human not present
• Universal Commerce Protocol (UCP)
• All terms