{"month":"2026-03","brief":{"id":"brief-2026-03","type":"monthly_brief","slug":"machine-economy-2026-03","month":"2026-03","headline":"MPP and Tempo force a multi-rail map","summary":"Tempo mainnet and Stripe’s MPP made it indefensible to cover only Coinbase x402. Incumbent payments firms now had an HTTP 402 story that settles into existing merchant balances.","whyItMatters":"Watch whether agents actually present MPP credentials in the wild, with evidence.","whatToWatch":"Watch whether agents actually present MPP credentials in the wild, with evidence.","eventAt":"2026-03-28","sourcePublishedAt":"2026-03-28","zfiniaPublishedAt":"2026-09-07T00:00:00.000Z","retrospective":true,"evidenceTier":"TIER_C","sourceName":"zFinia retrospective synthesis","sourceType":"zfinia_original","sourceUrl":"https://zfinia.com/archive/2026-03","official":false,"risk":"low","newsroomState":"PUBLISHED","methodology":"Original zFinia monthly brief. Event date is the month being described. zFinia publication date is 2026-09-07. Claims are limited to previously sourced official records in this archive plus labelled inference.","clusterKey":"id:brief-2026-03","publicationGate":{"autoPublish":false,"state":"SUMMARY_READY","review":"CORROBORATE","reason":"AMBIGUOUS_OR_SYNTHESIS"},"ingestedAt":"2026-09-10T12:13:11.596Z","updatedAt":"2026-09-10T12:13:11.596Z"},"timeline":{"schemaVersion":"zfinia-newswire-1","entity":"2026-03","generatedAt":"2026-09-10T12:13:11.596Z","items":[],"usageRights":"Caller may use returned JSON for their own systems. A single call does not grant redistribution of the full zFinia corpus as a competing archive. HTML pages are not the canonical bulk database."}}