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Commerce plane

Machine Payments Protocol (MPP)

Govern in-band machine-to-machine HTTP payments (Stripe · Tempo).

View coverage matrixRead the spec

Live in the gateway today.

What it answers

Can it pay?

Machine Payments Protocol (MPP) sits in the commerce plane of the agent-interop stack. Can it pay? AxioRank tracks it as one row in a coverage matrix that spans six planes, from discovery and identity to authorization, content permission, and commerce.

Plane

Commerce

Status

live

Direction

outbound

How AxioRank handles it

Governed, not just listed.

Live in the gateway today. Outbound: when the agents you run reach out to other agents and services.

Read the Machine Payments Protocol (MPP) specification

More commerce protocols

Related protocols

x402

Preflight an HTTP 402 payment demand. Verify the charged resource, pay-to address, asset, and network before an agent pays.

Open

Agentic Commerce Protocol (ACP)

Validate a delegated payment allowance: capped amount, merchant binding, expiry, and network-token (not raw PAN) funding.

Open

Universal Commerce Protocol (UCP)

Validate UCP agent-checkout discovery and lifecycle (Google · Shopify).

Open

AP2 Payments

Govern AP2 agent-initiated payments across card, ACH, and crypto rails.

Open

L402 (Lightning HTTP 402)

Preflight an L402 payment challenge. Check the Lightning invoice (network, amount) and macaroon before an agent pays.

Open

All protocols

The full coverage matrix across six planes.

Open

Govern the whole agent stack

AxioRank verifies identities and capabilities across the agent ecosystem, from discovery to commerce. See the full coverage matrix, machine-readable.

View coverageRead the docs