AP2
AP2 carries payment mandates over the A2A protocol, declaring which roles an agent plays in a transaction.
Why it matters
Roles matter: shopper, merchant, credentials provider and payment processor have very different permissions.
Pass criteria
The A2A Agent Card advertises an AP2 extension with role information.
Every request the check makes is recorded (URL, method, response status, relevant headers and a body preview) and shown under the check in your results.
How to implement it
Advertise Agent Payments Protocol support through your A2A Agent Card
The A2A Agent Card advertises an AP2 extension with role information.
The step-by-step implementation prompt is part of the Pro plan.
See plansScan your site
See whether this check passes on your domain, along with the other 21.
Related checks
x402
Payable routes answer HTTP 402 with x402 requirements, or a discovery document is published.
MPP
An OpenAPI document annotates payable operations with x-payment-info.
UCP
/.well-known/ucp declares protocol_version and at least one service.
ACP
/.well-known/acp.json declares protocol.name, api_base_url, transports and capabilities.services.