Machine Payments Protocol (MPP)

Definition

An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins, cards and Lightning.

Example

Stripe accepts MPP with cards via SPT and USDC on Tempo and Solana. docs.stripe.com, read 4 Nov 2026.

Where it appears in the sourced facts

• Visa Intelligent Commerce Connect accepts TAP alongside MPP, ACP and UCP, in pilot since April 2026. visa.co.uk, read 4 Nov 2026. In Visa Trusted Agent Protocol (TAP).
• Intelligent Commerce Connect accepts agent-initiated payments over TAP, MPP, ACP and UCP and is "currently in pilot with select partners": AWS, Diddo, Highnote, Mesh, Payabli and Sumvin. visa.co.uk, read 4 Nov 2026. In Visa Intelligent Commerce (incl. Intelligent Commerce Connect).
• The June release cites open standards like x402 and "Machine Payments Protocol compatibility". mastercard.com, read 4 Nov 2026. In Mastercard Agent Pay for Machines (AP4M).
• mpp.dev says MPP is "co-authored by Tempo and Stripe" and standardises HTTP 402 with Challenges, Credentials and a Payment-Receipt header. mpp.dev, read 4 Nov 2026. In Machine Payments Protocol (MPP).
• MPP intents are charge (one-time), session (metered) and subscription (recurring); transports map to HTTP headers, JSON-RPC (MCP) and WebSocket. mpp.dev, read 4 Nov 2026. In Machine Payments Protocol (MPP).

Nearby terms

• Shared Payment Token (SPT)
• Delegated payment
• Facilitator
• All terms