Understanding x402 and MPP: Two Paths for Agent Payments
The article explores two competing approaches for enabling AI agents to make payments: x402 and the Machine Payments Protocol (MPP).
x402, led by Coinbase, adopts a minimalist, protocol-based design. It revives the HTTP 402 status code to enable pay-per-request microtransactions directly on-chain, without accounts or intermediaries. It is open-source, chain-agnostic (currently supporting Base, Polygon, Solana), and optimized for decentralized, permissionless systems. However, current adoption is early, with low transaction volumes.
In contrast, MPP (by Stripe and Tempo) is a maximized, system-level solution. It uses sessions and streaming payments to support high-frequency transactions without per-action on-chain settlement. Built on the high-throughput Tempo blockchain, it integrates fiat payments via Stripe’s Shared Payment Tokens (SPTs) and offers built-in compliance, risk management, and enterprise-grade scalability. Key partners include Anthropic, OpenAI, Shopify, and Visa.
Stripe supports both protocols, allowing merchants to accept agent payments via either method. x402 suits open, long-tail applications, while MPP targets commercial, high-scale use cases. Both are in early stages, but major infrastructure players are backing them, anticipating future agent-driven economies.
marsbit03/20 03:53