{"artifact":{"apiPath":"/api/reports/tempo-x402-mcp-commerce-stack-2026-03/evidence","byteLength":5379,"description":"Structured evidence ledger tying claims and chart provenance back to cited sources.","format":"evidence","label":"Evidence artifact","mimeType":"application/json; charset=utf-8","priceUsdc":0,"sha256":"9cc24ac778f24807f3b5408422ede9ab4cdb42b8bb57ebb34fd9e470a1b1d971","status":"live"},"document":{"chartProvenance":[{"chartTitle":"x402 daily transaction surge in late October 2025","sourceLabels":["Panewslab x402 surge"],"sourceUrls":["https://www.panewslab.com/en/articles/7c3be5b3-b0de-4405-adbd-af9a16d4ae09"],"whyUseful":"Turns the report's adoption argument into a measured usage curve instead of a conceptual protocol comparison."},{"chartTitle":"x402 cumulative transaction milestones by March 2026","sourceLabels":["Panewslab x402 surge","O-mega Tempo guide","DeFiPrime MPP vs x402"],"sourceUrls":["https://www.panewslab.com/en/articles/7c3be5b3-b0de-4405-adbd-af9a16d4ae09","https://o-mega.ai/articles/tempo-and-agentic-payments-the-complete-guide-2026","https://defiprime.com/stripe-mpp-vs-x402"],"whyUseful":"Shows how quickly paid-agent traffic and settled value accumulated after launch, which matters more to buyers than launch timing alone."}],"claims":[{"chartTitles":[],"confidence":"high","id":"layer-boundary-mcp","kind":"finding","section":"Layer boundaries","sourceLabels":["MCP specification","x402 welcome"],"sourceUrls":["https://modelcontextprotocol.io/specification/2025-06-18","https://docs.cdp.coinbase.com/x402/welcome"],"statement":"MCP remains the tool and context transport layer and does not define native pricing or settlement."},{"chartTitles":[],"confidence":"high","id":"x402-http-handshake","kind":"finding","section":"Paid HTTP handshake","sourceLabels":["x402 welcome","MCP Server with x402"],"sourceUrls":["https://docs.cdp.coinbase.com/x402/welcome","https://docs.cdp.coinbase.com/x402/mcp-server"],"statement":"x402 standardizes the stateless HTTP 402 challenge-pay-retry loop that can sit beneath MCP tools and above a settlement network."},{"chartTitles":[],"confidence":"high","id":"mpp-session-operator-layer","kind":"comparison","section":"Settlement and sessions","sourceLabels":["Tempo Mainnet launch","Privy on Tempo MPP","Alchemy x402 vs MPP"],"sourceUrls":["https://tempo.xyz/blog/mainnet","https://privy.io/blog/building-on-privy-with-tempo-machine-payments-protocol","https://www.alchemy.com/blog/x402-vs-mpp-comparing-agent-payment-protocols"],"statement":"Tempo Mainnet and MPP extend the stack with sessions, broader payment-method coverage, and operator-facing controls rather than replacing x402's negotiation layer."},{"chartTitles":[],"confidence":"medium","id":"composition-pattern-production","kind":"comparison","section":"Composition pattern","sourceLabels":["MCP Server with x402","Vercel x402-mcp","Tempo Mainnet launch"],"sourceUrls":["https://docs.cdp.coinbase.com/x402/mcp-server","https://vercel.com/blog/introducing-x402-mcp-open-protocol-payments-for-mcp-tools","https://tempo.xyz/blog/mainnet"],"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":["x402 daily transaction surge in late October 2025"],"confidence":"medium","id":"x402-daily-surge","kind":"chart","section":"Adoption and scale","sourceLabels":["Panewslab x402 surge"],"sourceUrls":["https://www.panewslab.com/en/articles/7c3be5b3-b0de-4405-adbd-af9a16d4ae09"],"statement":"Public x402 volume reporting moved from roughly 1,000 daily transactions on October 23, 2025 to about 300,000 by October 26, turning the protocol from a spec story into a usage story."},{"chartTitles":["x402 cumulative transaction milestones by March 2026"],"confidence":"medium","id":"x402-cumulative-milestones","kind":"market","section":"Adoption and scale","sourceLabels":["Panewslab x402 surge","O-mega Tempo guide","DeFiPrime MPP vs x402"],"sourceUrls":["https://www.panewslab.com/en/articles/7c3be5b3-b0de-4405-adbd-af9a16d4ae09","https://o-mega.ai/articles/tempo-and-agentic-payments-the-complete-guide-2026","https://defiprime.com/stripe-mpp-vs-x402"],"statement":"Cumulative public x402 activity reached 1.446 million transactions by late October 2025 and was cited in March 2026 reporting at roughly 140 million transactions after nine months in market."}],"generatedAt":"2026-03-22T00:00:00.000Z","slug":"tempo-x402-mcp-commerce-stack-2026-03","summary":{"chartBackedClaimCount":2,"claimCount":6,"ecosystemSourceCount":6,"officialSourceCount":5,"totalSourceCount":11},"title":"Tempo, x402, and the MCP Commerce Stack"},"generatedAt":"2026-05-04T00:17:22.481Z","kind":"deep_report_evidence","operatorAccess":null,"payer":null}