Velocity-proven SKUs absent from eBay, cheapest channel-expansion lift.
At a glance
Count of high-velocity Amazon SKUs that are not currently listed on eBay. The “cheapest channel-expansion lift” card: SKUs already proven to convert on Amazon are the lowest-risk additions to eBay’s catalogue, every row here is a missed-revenue opportunity that requires zero new product investment.
Calculation
Calculated automatically from your eBay data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.Worked example
A US consumer-electronics seller with 480 SKUs on Amazon US and 320 SKUs on ebay.com. Snapshot 28 Apr 26.
Five things to notice:
- 3 high-velocity Amazon SKUs are absent from eBay. Top-quartile by Amazon volume / GMV. Rough 90D eBay capture estimate: 11k of incremental revenue per quarter, zero new product investment required. The cost is listing labour (a few hours per SKU) plus a small Promoted budget to accelerate Best Match.
- Capture rates of 35 to 50% are typical for proven SKUs. eBay’s audience is structurally different from Amazon’s (more deal-driven, more collectibles-focused, older demographic skew). A SKU that does 1,400 to $2,000 / month on eBay once mature (90+ days listed). Lower for some categories (consumables, beauty), higher for others (parts, refurbished).
- Promoted Standard at 5 to 8% ad rate is the right launch lever. New listings rank poorly in organic Best Match (Best Match heavily weights sales history). Promoted Standard buys placement until organic ranking catches up. Budget 5 to 8% ad rate for the first 60 days, then taper as the listing earns organic visibility.
- The seller already lists 320 of 480 Amazon SKUs on eBay (67% catalogue coverage). Coverage above 80% is the target for sellers committed to multi-marketplace; coverage below 50% suggests the seller is testing eBay rather than committed. The 3 missing top-velocity SKUs are the highest-priority gaps; long-tail Amazon SKUs (under threshold) can be deprioritised or batched.
- The card is the prioritisation lens, not the action plan. Once flagged, each SKU needs: (a) listing-quality audit (photos, item-specifics, description), (b) pricing aligned with Catalogue Drift discipline, (c) Promoted spend allocation, (d) inventory commitment (don’t list if you can’t fulfil). Skipping any of these makes the eBay listing noise rather than channel expansion.
Sibling cards merchants should reference together
Reconciling against the vendor’s own dashboard
Where to look in eBay Seller Hub:Seller Hub → Listings → Active, current eBay catalogue. Compare against the seller’s Amazon catalogue (Seller Central → Inventory → Manage Inventory) to identify gaps manually.eBay alone doesn’t show Amazon-velocity comparisons; this card is a Vortex IQ cross-platform composite. Where to look in Amazon Seller Central (Amazon-side data):
Amazon Seller Central → Reports → Business Reports → Detail Page Sales and Traffic by Child Item. Amazon SKU-level units sold over the last 30 days.Timing, settlement, and reporting-lag table:
Why our number may legitimately differ from a manual cross-platform audit:
Cross-connector reconciliation against other connectors the same seller may run:
Known limitations / merchant FAQs
What’s the velocity threshold? Default: top-quartile of the seller’s Amazon SKUs by 30D unit velocity. Tunable per workspace. Lower the threshold (top-half) to catch more long-tail opportunities; raise it (top-decile) to focus on only the highest-impact gaps. Why don’t I want to list every Amazon SKU on eBay? Three reasons: (1) listing labour cost (a few hours per SKU; for a 5,000-SKU catalogue that’s prohibitive); (2) Promoted spend efficiency, low-velocity SKUs don’t earn back the Promoted budget needed to launch them; (3) operational complexity, more listings = more cases / refunds / inventory-sync risk. Listing the top quartile by velocity gives 80% of the benefit at 20% of the effort. What’s the typical eBay capture rate for a proven Amazon SKU? 35 to 50% of Amazon volume within 90 days is typical, after the listing earns Best Match search rank. Lower in some categories (consumables, beauty: 20 to 30%); higher in others (parts, refurbished, collectibles-adjacent: 50 to 70%). Should I price the eBay listing the same as Amazon? Yes, by default. Cross-platform price drift is a separate problem (Catalogue Drift). Launch new eBay listings at price parity with Amazon; let Best Offer dynamics or future repricing handle channel-specific pricing if needed. FBA vs FBM: which fulfilment route should I use for new eBay listings? FBM (seller-fulfilled or via 3PL like ShipBob) is typical. Amazon’s FBA inventory is technically eligible for FBA-multi-channel-fulfilment to ship eBay orders, but the FBA fees are higher than ShipBob’s eBay-channel rates for most sellers, and FBA shipments may take 1 to 2 days longer than eBay buyers expect. Use FBA-MCF only for SKUs you don’t want to split inventory on. How long does it take a new eBay listing to start converting? Best Match earns rank from sales history. New listings rank low in organic search until they accumulate sales. Promoted Standard / Advanced is the bridge: budget 5 to 8% ad rate for the first 60 days. After 60 to 90 days, organic ranking improves and you can taper Promoted spend. Multi-site coverage: should I prioritise UK or US gaps? Depends on the seller’s strategic priority. UK eBay has higher per-buyer engagement (older audience, higher repeat-buyer rate); US eBay has higher absolute volume. For a UK-first seller expanding US, prioritise US gaps; for a US-first seller building UK presence, prioritise UK gaps. Why doesn’t this match my own gap analysis? Three usual causes: (1) different velocity threshold (you’re using top-half, the card defaults to top-quartile); (2) SKU-matching differences (manual audit catches title-similar non-matches that the card filters out); (3) listing-state filter (the card only counts active eBay listings; if you’ve ended a listing recently, the card may flag it as missing while you remember listing it). Action playbook when this card alerts (>5 top-velocity SKUs missing):
- Sort flagged SKUs by Amazon-velocity descending. Highest first.
- For each, audit listing-readiness: do you have product photos, item-specifics, fulfilment inventory? If any of these are missing, listing on eBay won’t help.
- Draft eBay listings using the seller’s standard listing template. Use Seller Hub bulk-create or the Sell Inventory API for batch creation.
- Set initial price at parity with the Amazon listing.
- Allocate Promoted Standard budget at 5 to 8% ad rate for the first 60 days.
- Monitor Total Revenue and eBay vs Amazon Revenue Share to confirm the share lift over the 90-day post-launch window.