Category · Payments & protocols
Agent checkout and mandate protocols
Protocols for an agent buying goods or services on a person's behalf, with mandates that prove what the person approved. AP2 and ACP compared on governance, what a merchant has to build, how consent is captured and how disputes work.
Capability keys payments.protocol · payments.mandate · payments.card-token · payments.checkout · All tools
letme.dev/payments.protocol picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
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| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| – | Agentic Commerce Protocol (ACP)OpenAI and Stripe · Payment protocol | Checkout | C | 60.9 | 2.0 (2) | n/a | n/a | Free | API key | Spec | ||
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Open checkout spec from OpenAI and Stripe (2025-09-29). Top strength OpenAPI, JSON Schema and OpenRPC files for every surface, with examples per dated version Top weakness No release since 2026-04-17 and one merged change since June, with 85 open issues and 51 open pull requests |
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| – | Agent Payments Protocol (AP2)Google (standardisation moved to the FIDO Alliance) · Payment protocol | Checkout | C | 55.3 | 2.0 (2) | n/a | n/a | Free | OAuth or key | Spec | ||
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Google's protocol for authorising agent payments, now governed by the FIDO Alliance. Top strength User-signed SD-JWT mandates bound to the agent's key and to a merchant-signed checkout hash Top weakness No production deployment named by Google or found elsewhere |
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Nothing matches these filters. .
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