Yes another agentic payment acronym. This one is important enough to remember. Where AP2 and ACP address agents acting on behalf of humans, X402 and MPP are about agents paying agents. My friend Simon Taylor just put together one of his all-time best posts on MPP and The Intention Layer. Today’s blog is a follow-up with a bit more of a comparison, and why this is a big deal from a payment and economic perspective. My key takeaways from Simon’s post

• The “Skinny Master Account”: Taylor suggests that humans will grant “intent” (a budget and a goal) to an agent. MPP’s Session model perfectly mirrors this: a human “locks” $50 into a session (the intention), and the agent autonomously spends it in sub-cent increments (the execution).
• The Substrate of AI: Taylor points out that AI thrives on Structured Text (Markdown). Ironically, legacy finance (ISO 8583, NACHA files) is essentially structured text. MPP acts as the “translator” between the agent’s markdown-based intentions and the rigid requirements of the global banking system.
• The Outcome: The winner won’t be the protocol that is “most decentralized,” but the one that most effectively manages Trust and Permissioning. Stripe and Visa, as the incumbent trust-layers of the internet, are better positioned to solve the “Agentic Spend” problem than a pure-crypto protocol.