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layer."},{"chartTitles":[],"confidence":"medium","id":"composition-pattern-production","kind":"comparison","section":"Composition pattern","sourceLabels":["MCP Server with x402","Tempo Mainnet launch","Vercel x402-mcp"],"statement":"The strongest production signal is composition: paid MCP tooling is already combining tool connectivity, paid HTTP, and settlement-oriented rails instead of collapsing them into one protocol."},{"chartTitles":[],"confidence":"high","id":"x402-http-handshake","kind":"finding","section":"Paid HTTP handshake","sourceLabels":["MCP Server with x402","x402 welcome"],"statement":"x402 standardizes the stateless HTTP 402 challenge-pay-retry loop that can sit beneath MCP tools and above a settlement network."}],"reportDefinitionEntries":[],"reportMethodology":["Anchored the report in official documentation from Tempo, x402, and the Model Context Protocol, with absolute dates as of March 21, 2026.","Used a Perplexity deep-research pass plus focused search queries to gather public examples, then filtered out irrelevant Tempo and MCP references.","Preferred official specifications and launch documentation whenever secondary analysis disagreed or overstated the overlap.","Mapped each protocol to a distinct buyer decision: tool connectivity, payment negotiation, or settlement and operator control."],"reportPublishedAt":"2026-03-21T00:00:00.000Z","reportSources":[{"kind":"ecosystem","label":"Alchemy x402 vs MPP","note":"Technical comparison that helps clarify where x402 ends and MPP starts.","url":"https://www.alchemy.com/blog/x402-vs-mpp-comparing-agent-payment-protocols"},{"kind":"ecosystem","label":"DeFiPrime MPP vs x402","note":"Public comparison used here for the Coinbase 50 million transaction claim and protocol framing.","url":"https://defiprime.com/stripe-mpp-vs-x402"},{"kind":"official","label":"MCP Server with x402","note":"Official Coinbase guide showing how paid x402 endpoints can sit behind MCP 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