AP2
AP2 (AI Agent Payment Authorization Protocol) is a payment authorization protocol for AI agents, designed to regulate the permission verification and authorization process for initiating or processing payments during autonomous task execution. Core functions include identity authentication, tiered payment permission management, and transaction compliance assurance. It is typically used in conjunction with user authorization agreements to establish a secure framework for AI agents participating in commercial transactions.
Timeline (last 90 days)
The April 2026 version of AP2 added purchase scenarios with no human present, such as buying concert tickets the instant they go on sale.
Google has handed AP2 over to the FIDO Alliance.
UCP is compatible with AP2 and MCP, currently runs in Search's AI Mode and the Gemini app, and its payment feature launched first in the US, with Canada, Australia and the UK having announced they will follow.
Google is leading the push for UCP (Universal Commerce Protocol), and Visa launched AP2 (Agent Payments Protocol) for agent identities, focusing on the questions of who is paying and whether user authorization has been obtained.
AP2 has 3,226 GitHub stars, 19 contributors, 0 commits in 90 days and 3 MCP servers; ACP has 1,571 GitHub stars, 26 contributors, 1 commit in 90 days and 3 MCP servers; x402 has 6,715 GitHub stars, 334 contributors, 278 commits in 90 days and 222 MCP servers.
The four protocols x402, AP2, ACP and L402 currently all handle only single-transaction authorization, and do not define ongoing spending budgets, payee rules or human approval steps.
For AP2 and ACP, the existence of officially published packages on npm/PyPI cannot be confirmed, so development can only be done by hand-writing implementations according to the specification.
The last push to AP2's specification repository (google-agentic-commerce/AP2) was on June 17, 2026, with zero commits in the past 90 days.
AP2 defines signed Mandates that can carry a per-transaction price cap, and distinguishes human present from human not present flows, but a Mandate authorizes a single shopping cart rather than an ongoing allowance.
Google's AP2 protocol proves through signed authorization that a user did indeed authorize a given purchase, and it has been donated to the FIDO Alliance.
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All Facts (13)
文章介绍的六大AI智能体协议为MCP、A2A、UCP、AP2、A2UI和AGUI
95%UnverifiedAP2（Agent Payments Protocol）引入了类型化的授权委托（Mandates），包括结账委托、支付委托和签名收据
85%UnverifiedUCP is compatible with AP2 and MCP, currently runs in Search's AI Mode and the Gemini app, and its payment feature launched first in the US, with Canada, Australia and the UK having announced they will follow.
50%UnverifiedGoogle is leading the push for UCP (Universal Commerce Protocol), and Visa launched AP2 (Agent Payments Protocol) for agent identities, focusing on the questions of who is paying and whether user authorization has been obtained.
50%UnverifiedAP2 defines signed Mandates that can carry a per-transaction price cap, and distinguishes human present from human not present flows, but a Mandate authorizes a single shopping cart rather than an ongoing allowance.
50%UnverifiedFor AP2 and ACP, the existence of officially published packages on npm/PyPI cannot be confirmed, so development can only be done by hand-writing implementations according to the specification.
50%UnverifiedThe four protocols x402, AP2, ACP and L402 currently all handle only single-transaction authorization, and do not define ongoing spending budgets, payee rules or human approval steps.
50%UnverifiedAP2 has 3,226 GitHub stars, 19 contributors, 0 commits in 90 days and 3 MCP servers; ACP has 1,571 GitHub stars, 26 contributors, 1 commit in 90 days and 3 MCP servers; x402 has 6,715 GitHub stars, 334 contributors, 278 commits in 90 days and 222 MCP servers.
50%UnverifiedGoogle's UCP is an open-source agentic commerce checkout standard and is compatible with AP2.
50%UnverifiedGoogle's AP2 protocol proves through signed authorization that a user did indeed authorize a given purchase, and it has been donated to the FIDO Alliance.
50%UnverifiedGoogle has handed AP2 over to the FIDO Alliance.
50%UnverifiedThe April 2026 version of AP2 added purchase scenarios with no human present, such as buying concert tickets the instant they go on sale.
50%UnverifiedThe last push to AP2's specification repository (google-agentic-commerce/AP2) was on June 17, 2026, with zero commits in the past 90 days.
50%