Comparison
AP2 vs Machine Payments Protocol
AP2 and Machine Payments Protocol are Payment rails listings set side by side. AP2 is beta. Machine Payments Protocol is live. Open payment extension for A2A and UCP that records checkout and payment authorization as signed mandates. Public samples exist while FIDO continues the standards work.
Last verified 2026-10-19 (AP2), 2026-10-16 (Machine Payments Protocol)
Sources
| Field | AP2 | Machine Payments Protocol |
|---|---|---|
| Status | Beta | Live |
| Open source | Yes | Yes |
| Last verified | 2026-10-19 | 2026-10-16 |
| Mechanism | Open payment extension for A2A and UCP that records checkout and payment authorization as signed mandates. Public samples exist while FIDO continues the standards work. | Open HTTP 402 protocol, co-authored by Stripe and Tempo, so an agent can authorize payment for an API with a card or a stablecoin and receive a receipt. |
| Tags | mandates, cards, stablecoins | http-402, cards, stablecoins |
| Links | ||
| Sources |
Tags
- Shared
- cards, stablecoins
- Only AP2
- mandates
- Only Machine Payments Protocol
- http-402
Glossary
Questions
- What is the status of AP2 and Machine Payments Protocol?
- AP2 is beta. Machine Payments Protocol is live.
- When was each listing last verified?
- AP2 was last verified 2026-10-19. Machine Payments Protocol was last verified 2026-10-16.
- Does this page score AP2 against Machine Payments Protocol?
- No. The page restates each mechanism and cites the listing sources.