{"month":"2025-09","brief":{"id":"brief-2025-09","type":"monthly_brief","slug":"machine-economy-2025-09","month":"2025-09","headline":"Machine payments leave the whitepaper phase","summary":"By September 2025 x402 had been public for four months, MCP for ten, and Visa Intelligent Commerce for five. Google AP2 and Stripe/OpenAI ACP arrived in the same month. The public record still showed announcements and SDKs more than independent payer proof.","whyItMatters":"Watch whether discovery indexes start publishing repeat-payer fields rather than listing counts.","whatToWatch":"Watch whether discovery indexes start publishing repeat-payer fields rather than listing counts.","eventAt":"2025-09-28","sourcePublishedAt":"2025-09-28","zfiniaPublishedAt":"2026-09-07T00:00:00.000Z","retrospective":true,"evidenceTier":"TIER_C","sourceName":"zFinia retrospective synthesis","sourceType":"zfinia_original","sourceUrl":"https://zfinia.com/archive/2025-09","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-2025-09","publicationGate":{"autoPublish":false,"state":"SUMMARY_READY","review":"CORROBORATE","reason":"AMBIGUOUS_OR_SYNTHESIS"},"ingestedAt":"2026-09-10T12:23:50.895Z","updatedAt":"2026-09-10T12:23:50.895Z"},"timeline":{"schemaVersion":"zfinia-newswire-1","entity":"2025-09","generatedAt":"2026-09-10T12:23:50.895Z","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."}}