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.
| What it counts | COUNT(Amazon SKUs WHERE units_sold_30d > velocity_floor AND SKU NOT IN eBay_listings). The velocity_floor is configurable (default: top-quartile of the seller’s Amazon SKUs by 30D unit velocity). |
| Listing-format scope | All Amazon orders contribute to velocity ranking. The eBay-side check is against any active listing format (fixed-price or auction). |
| GMV / fees framing | Each row carries the SKU’s 30D Amazon GMV as the opportunity-size indicator. Adding to eBay won’t replicate this volume on day one (eBay’s audience is different, search ranking takes time), but a 30 to 50% capture rate within 90 days is typical. |
| Promoted Listings | If launched on eBay, these SKUs would benefit from Promoted Listings to accelerate Best Match search ranking (new listings with no sales history rank low in organic Best Match). Plan to budget Promoted spend on each new listing. |
| Multi-site aggregation | The card pairs each Amazon marketplace with its eBay counterpart by default (Amazon UK with eBay UK, Amazon US with eBay US). A SKU listed on Amazon US but not eBay US is a flag, even if it’s listed on eBay UK. |
| Currency | Native per-marketplace currency. Velocity ranking is unit-based (not currency-based) so cross-currency aggregation is not required. |
| Best-Offer-resolved orders | Not directly relevant; this is a catalogue-presence card, not an order-flow card. |
| Refunds | Not directly relevant. The Amazon-side velocity used for prioritisation is gross of refunds; high-refund-rate SKUs may have inflated apparent velocity. Cross-reference with Amazon Return Rate. |
| Cancellations | Not relevant; Amazon velocity is order-based. |
| Time window | 30D (rolling) for the Amazon-side velocity input. The eBay-presence check is real-time. |
| Alert trigger | >5 top-velocity SKUs missing on eBay. The threshold catches material gaps without firing on long-tail SKUs that may not justify cross-listing. |
| Roles | owner, marketing |
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.| Amazon SKU | 30D units | 30D Amazon GMV | Listed on eBay? | Estimated 90D eBay capture |
|---|---|---|---|---|
| BLU-HDMI-2M | 480 | $4,080 | No | 2,000 (35 to 50%) |
| WIFI-RT-AC1200 | 220 | $8,800 | Yes | n/a |
| HDMI-4K-3M | 65 | $940 | No (under threshold; not flagged) | n/a |
| BT-SPK-MINI | 380 | $11,400 | No | 5,700 |
| USB-C-CHRG-65W | 290 | $7,250 | No | 3,600 |
| WALL-MOUNT-LRG | 180 | $14,400 | Yes | n/a |
| Top-quartile SKUs missing on eBay | 3 SKUs | 11,300 / 90D |
- 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
| Card | Why pair it with Amazon Top SKUs Missing on eBay |
|---|---|
| Catalogue Drift vs Amazon | Sister card; tracks SKUs that exist on both channels but are priced inconsistently. |
| eBay vs Amazon Revenue Share | The aggregate share view; this card surfaces specific SKUs that could shift the share toward eBay. |
| Active Listings | The eBay-side catalogue size. Adding flagged SKUs grows this count. |
| Listings Missing Attributes | When launching new eBay listings, ensure required item-specifics are populated from day one. |
| Promoted Spend | Budget Promoted spend on new launches to accelerate Best Match ranking. |
| Total Revenue | The growth lever. Capturing 11k / quarter from missing SKUs adds 1 to 4% to typical eBay revenue. |
| Amazon Total Sales | The Amazon side of the velocity input. |
| Shopify Total Revenue | Triangulation: SKUs missing from eBay may also be missing from Shopify. Cross-channel coverage audit. |
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-channel 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:
| Topic | Detail |
|---|---|
| Timezone | Amazon-side velocity uses Pacific Time (US accounts); eBay-side catalogue presence is a real-time check. The card refreshes daily at 03:00 UTC. |
| Settlement / payout impact | Indirect. Adding flagged SKUs to eBay grows revenue and fees; payout cadence depends on TRS standing. |
| Promoted Listings cost reporting lag | Not directly relevant. New listings need Promoted to launch; budget at workspace level. |
| API throttling | Amazon SP-API: per-marketplace per-second limits. eBay Sell Inventory API: 5,000 calls/day. SKU-matching index rebuilds nightly. |
| SKU matching cadence | GTIN / EAN / MPN matching with title-and-brand fallback. New Amazon SKUs appear in the comparison the next day after they reach velocity threshold. |
| Reason | Direction | Why |
|---|---|---|
| Velocity floor | Either | The card’s default velocity_floor is top-quartile; a manual audit at a different threshold (e.g. top-decile) would surface a different list. Tunable per workspace. |
| SKU matching imperfections | Either | False matches (different SKUs with similar titles) and false negatives (same SKU with slight title variations) both occur. GTIN-only matching gives higher precision at lower coverage. |
| eBay-listing state | Same on both | Only “active” eBay listings count as “present”; ended / sold-out listings are excluded. Matches Seller Hub’s filter. |
| Per-marketplace pairing | Default vs custom | Default pairs Amazon US with eBay US; cross-marketplace pairings configurable. |
| Card | Expected relationship | What causes legitimate divergence |
|---|---|---|
amazon.total_sales | Source data. Amazon-side velocity ranking comes from Amazon order data; should reconcile within sync-lag tolerance. | Identical data source. |
shopify.total_revenue | If running a Shopify storefront, the same gap analysis can be done Shopify-vs-eBay. The 3-channel coverage audit (eBay + Amazon + Shopify) shows true catalogue coverage. | Independent populations; shows the seller’s commitment level per channel. |
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-channel 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.