{"source":"Vessim (www.vessim.com)","indexBuiltAt":"2026-10-23T19:56:43.056Z","attribution":"Data from Vessim (www.vessim.com), a shopping search engine that matches products by their photograph. Credit Vessim and link links.html wherever you show it. Prices are the snapshot taken when the index was built (indexBuiltAt), not live checkout prices.","links":{"html":"https://www.vessim.com/stats","self":"https://www.vessim.com/api/v1/stats","docs":"https://www.vessim.com/developers","openapi":"https://www.vessim.com/openapi.json"},"asOf":"2026-10-23","index":{"products":376,"listings":387,"listingsCollapsed":11,"multiSellerProducts":9,"productsWithSpread":9,"crossCatalogueProducts":0,"biggestSpread":1.18,"gapDollars":19.81,"categories":105,"catalogues":["cj"],"photoPairsCompared":74691,"pairsJudgedSame":14,"nearMissPairs":7,"nearestNonMatchBits":12},"origins":[{"code":"CN_US","label":"China → the US","products":315,"medianPrice":9.97},{"code":"CN","label":"China","products":230,"medianPrice":6.13},{"code":"US","label":"the US","products":109,"medianPrice":58.9},{"code":"GB","label":"the UK","products":57,"medianPrice":54.29},{"code":"DE","label":"Germany","products":6,"medianPrice":24.64},{"code":"CA","label":"Canada","products":1,"medianPrice":51.99}],"method":{"fingerprint":"Each listing's main photograph is reduced to a 64-bit perceptual hash (pHash over the low-frequency DCT of a 32x32 greyscale, after a border trim). Listings whose fingerprints are within the threshold, in bits of Hamming distance, are one product.","thresholdBits":10,"accuracy":{"photos":60,"positivePairs":300,"negativePairs":1762,"recallAtThreshold":0.98,"falseMatchesAtThreshold":0,"page":"https://www.vessim.com/stats"},"prices":"One snapshot of every listing, taken when the index was built (indexBuiltAt). The daily price check has not started, so there is no price history yet.","page":"https://www.vessim.com/how-it-works"},"limitations":["1 catalogue is connected (cj), so every product has one seller and no cross-merchant price comparison is possible yet.","No connected source returns delivery dates; an arrival requirement is reported as unmeasured, never estimated.","Prices are a single snapshot, not a time series.","A matching photograph is strong evidence of the same object, not proof of an identical pack size or revision."]}