{"provenance":{"source":"listings + sellers tables, live database","rule":"independent = not platform-operated, not ingest/founding-catalog, not affiliated, not VM_HOUSE_SELLER_NOS","machineReadable":"GET /api/proof/participation","demandLedger":"GET /api/proof/demand"},"generatedAt":"2026-10-02T20:06:58.952Z","asOfDate":"2026-10-02","snapshotPolicy":"Computed from the listings database at most once per day; the timestamp above is the actual computation time. If a refresh fails, the last verified snapshot is served with its original timestamp. No smoothing, no extrapolation.","independentSellersLive":12,"independentListingsLive":141,"firstListingRange":{"from":"2026-08-22","to":"2026-10-02"},"concentration":{"topSellerListings":86,"topSellerShare":0.61},"recent":[{"sellerName":"S-000604","sellerId":"52370fab-a2aa-4ef3-96fc-a85e7dc76a66","firstListedAt":"2026-10-02T05:39:14.901Z","liveListings":2,"listingId":"a29d4232-4e25-4877-a68a-04b9923e2f74","listingTitle":"AI-Agent Platform Census v1 - mechanics, onboarding flows, and receipt standards for 20+ agent venues"},{"sellerName":"S-000618","sellerId":"c48d1a7b-4c5f-46c8-8b4c-2477cb1c1cc3","firstListedAt":"2026-10-01T15:44:11.620Z","liveListings":3,"listingId":"eabe47d5-f433-419f-92a7-c060169fd73d","listingTitle":"BMW X7 (G07) Cargo Cover / Retractable Roller Blind — Genuine OEM 51477490440, Barely Used"},{"sellerName":"S-000588","sellerId":"eeb29bea-7ed2-4e5a-ace7-28bfa5528221","firstListedAt":"2026-09-27T01:59:37.657Z","liveListings":1,"listingId":"6de974db-b260-46b9-bbd6-9f23cbabb414","listingTitle":"Vermarco payout-rail proof record (chair test, 1 cent)"}],"series":[{"date":"2026-08-15","cumulativeSellers":0},{"date":"2026-08-16","cumulativeSellers":0},{"date":"2026-08-17","cumulativeSellers":0},{"date":"2026-08-18","cumulativeSellers":0},{"date":"2026-08-19","cumulativeSellers":0},{"date":"2026-08-20","cumulativeSellers":0},{"date":"2026-08-21","cumulativeSellers":0},{"date":"2026-08-22","cumulativeSellers":1},{"date":"2026-08-23","cumulativeSellers":1},{"date":"2026-08-24","cumulativeSellers":1},{"date":"2026-08-25","cumulativeSellers":1},{"date":"2026-08-26","cumulativeSellers":2},{"date":"2026-08-27","cumulativeSellers":2},{"date":"2026-08-28","cumulativeSellers":2},{"date":"2026-08-29","cumulativeSellers":2},{"date":"2026-08-30","cumulativeSellers":2},{"date":"2026-08-31","cumulativeSellers":2},{"date":"2026-09-01","cumulativeSellers":2},{"date":"2026-09-02","cumulativeSellers":2},{"date":"2026-09-03","cumulativeSellers":2},{"date":"2026-09-04","cumulativeSellers":2},{"date":"2026-09-05","cumulativeSellers":2},{"date":"2026-09-06","cumulativeSellers":2},{"date":"2026-09-07","cumulativeSellers":2},{"date":"2026-09-08","cumulativeSellers":2},{"date":"2026-09-09","cumulativeSellers":4},{"date":"2026-09-10","cumulativeSellers":5},{"date":"2026-09-11","cumulativeSellers":5},{"date":"2026-09-12","cumulativeSellers":5},{"date":"2026-09-13","cumulativeSellers":6},{"date":"2026-09-14","cumulativeSellers":6},{"date":"2026-09-15","cumulativeSellers":6},{"date":"2026-09-16","cumulativeSellers":6},{"date":"2026-09-17","cumulativeSellers":7},{"date":"2026-09-18","cumulativeSellers":8},{"date":"2026-09-19","cumulativeSellers":8},{"date":"2026-09-20","cumulativeSellers":8},{"date":"2026-09-21","cumulativeSellers":8},{"date":"2026-09-22","cumulativeSellers":9},{"date":"2026-09-23","cumulativeSellers":9},{"date":"2026-09-24","cumulativeSellers":10},{"date":"2026-09-25","cumulativeSellers":10},{"date":"2026-09-26","cumulativeSellers":10},{"date":"2026-09-27","cumulativeSellers":11},{"date":"2026-09-28","cumulativeSellers":11},{"date":"2026-09-29","cumulativeSellers":11},{"date":"2026-09-30","cumulativeSellers":11},{"date":"2026-10-01","cumulativeSellers":12},{"date":"2026-10-02","cumulativeSellers":13}],"seriesLabel":"Cumulative independent sellers who have published a listing","chartTitle":"Independent sellers: cumulative first listings","chartCaption":"Each seller is counted once, on the date of their first published listing. Sellers remain counted if their listings later become inactive. This measures listing participation, not buyer demand or sales. Platform-operated and affiliated sellers are excluded. Updated 2026-10-02 20:06 UTC.","independentSellersEver":13,"historyPolicy":"First-listing events are stored permanently (table seller_first_listings, insert-only) from September 11, 2026, seeded from listings active on that date. A seller who later removes all listings stays in the cumulative series. Affiliation corrections are recorded, never deleted.","caption":"As of October 2, 2026: 12 independent sellers have 141 live listings. All 12 self-onboarded, with first listings dated August 22–October 2. No independent paid sale has been recorded.","independenceDefinition":"Independent means the seller account is not operated by Vertical Marketplace LLC, is not one of the platform's own publishing or ingest accounts, and is not under common ownership with the company. The excluded accounts are listed in code and configuration; the list can only remove a seller from the independent count, never add one.","acquisitionNote":"Self-onboarded means the seller registered and published without direct outreach from the company. It does not establish how the seller found the marketplace.","demandNote":"Seller participation is a supply measure. It is not evidence of buyer demand or of sales. The settled-sales ledger is published separately at /api/proof/demand.","limitations":["The series counts sellers by the date of their first published listing, from a permanent insert-only record; a seller who later removes all listings still appears in the cumulative line but not in the live count.","History is recorded from September 11, 2026. Sellers whose listings were all inactive before that date are not in the series.","Listing counts are concentrated: the top independent seller's share is disclosed above.","Sellers are shown by anonymous public code (S-000000). Independence is a classification, not a verification of the seller's legal identity."]}