At a glance
Cross-platform revenue split between eBay GMV and Amazon sales over the 90-day window. The “where is my marketplace volume going” donut, telling the seller whether they’re an eBay-first, Amazon-first, or balanced multi-marketplace operator, and how that mix is shifting.
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 UK home-and-garden seller running ebay.co.uk + amazon.co.uk, with US expansion launched 6 months ago via ebay.com + amazon.com. 90-day window: 02 Feb 26 to 01 May 26.
Five things to notice:
- The seller is Amazon-first overall (58% Amazon vs 42% eBay). This is typical for UK home-and-garden sellers; Amazon’s Prime delivery promise dominates impulse / replacement purchases in this category. eBay’s stronger position is in collectibles, vintage, and refurbished, none of which are this seller’s lines.
- The UK market is more eBay-friendly than the US. UK split is 44% eBay / 56% Amazon; US split is 33% eBay / 67% Amazon. The US market consolidation toward Amazon is structural; eBay UK has held more ground because of legacy buyer behaviour and stronger collectibles share.
- Trend line over 4 quarters typically shows Amazon gaining 1 to 2 ppt per quarter. This isn’t a brand-specific trend; it’s an industry pattern. Sellers planning marketplace strategy should assume Amazon share continues to grow over the next 24 months unless they actively invest in eBay-specific levers (Promoted Standard, eBay Stores subscription, Best Offer dynamics).
- The TRS-discount on eBay matters for share economics. A seller losing TRS sees eBay net margin fall by ~1.3 percentage points (the lost FVF discount). At 42% eBay share, that’s a ~0.5% drag on overall blended margin, real but not alarming. A non-TRS Amazon-first seller might rationally migrate even more share to Amazon.
- Currency aggregation muddies the headline. The FX-adjusted £880k total uses today’s USD/GBP rate (~£0.79/$). Over the 90-day window the FX rate moved ~3%, so the historical-FX-adjusted total may differ from the spot-FX-adjusted total by 1 to 2%. For board reporting, agree the FX convention with finance.
Sibling cards merchants should reference together
Reconciling against the vendor’s own dashboard
Where to look in eBay Seller Hub (eBay-side data):Seller Hub → Performance → Sales, eBay GMV for the period.Where to look in Amazon Seller Central (Amazon-side data):
Amazon Seller Central → Reports → Business Reports → Sales and Traffic. Amazon ordered-product sales for the period.Sum each side’s 90-day total and compute the share manually; the figure should match this card to within a small reconciliation gap. Timing, settlement, and reporting-lag table:
Why our number may legitimately differ from a manual cross-platform sum:
Cross-connector reconciliation against other connectors the same seller may run:
Known limitations / merchant FAQs
What’s a “healthy” share split? There’s no universal answer; depends on category. Apparel, footwear, fashion accessories: Amazon dominant (60 to 80% Amazon share is typical). Collectibles, vintage, refurbished electronics: eBay dominant (60 to 80% eBay share). Home and garden, consumer electronics: Amazon-leaning (55 to 70% Amazon). Industrial / B2B parts: eBay-leaning (45 to 60% eBay) because of long-tail discoverability. Why is my Amazon share growing every quarter? Industry pattern. Amazon’s Prime delivery promise, larger advertising surface, and superior search result quality continue to take marketplace share from eBay industry-wide. Sellers can resist this with eBay-specific levers (Promoted, Best Offer, eBay Stores subscription, TRS-targeted operations) but the structural drift is toward Amazon. Are FBA and FBM split shown separately on the Amazon side? Not on this card. The aggregate Amazon-share figure includes both FBA (Amazon-fulfilled) and FBM (seller-fulfilled). For the FBA / FBM breakdown, see Amazon-side cards. The split matters for fulfilment cost analysis but not for top-line marketplace share. My multi-site numbers: how should I read this for board reporting? The headline shares are FX-aggregated; per-pair (eBay-UK with Amazon-UK, eBay-US with Amazon-US) drilldowns are exact in native currency. For board reporting, agree on either: (a) FX-converted single-currency total share, or (b) per-marketplace-pair share table. The card supports both; default is FX-converted single-currency. Does Best Offer affect my eBay share? Slightly downward. Best-Offer-resolved orders book at the negotiated total (typically 8 to 12% under asking), so a seller with heavy Best Offer activity has slightly lower booked GMV than a seller with the same volume of BIN orders. Effect is small (under 1 ppt of share for most sellers). Does Promoted Listings ROI affect this card? Only via volume. Higher Promoted ROI on eBay drives more eBay GMV, increasing eBay’s share. The card itself doesn’t differentiate paid from organic. Why doesn’t Shopify appear here? Because it’s a marketplace-vs-marketplace card, focused on eBay vs Amazon. Shopify is a DTC channel; treat it as a third pie slice when looking at total revenue mix. Some Vortex IQ workspaces enable a 3-channel donut (eBay + Amazon + Shopify); toggle in card settings. My Amazon side dropped 30% but eBay stayed flat, what happened? Three usual causes: (1) Amazon listing suspension or Buy Box loss; (2) FBA inventory stockout (Amazon orders stop, but eBay’s seller-fulfilled inventory keeps shipping); (3) Amazon advertising budget exhaustion. Investigate Amazon-side cards first; the share movement is the symptom, not the cause. Is there an alert on this card? Default: no alert. Some workspaces set a custom alert at “share shifts >5 ppt vs prior 90D” to catch step-changes. Configure in card settings if you want share-trend monitoring. Action playbook for using this card:- Read the headline share monthly to track marketplace mix trend.
- If eBay share is degrading, audit eBay-side operational health (TRS, defect rate) and listing quality (specifics, photos).
- If Amazon share is degrading, audit Buy Box position, FBA inventory levels, and Amazon advertising.
- For multi-marketplace expansion decisions, use this card to identify under-developed channel pairs (e.g. ebay.com share well below ebay.co.uk share = US-eBay underdeveloped, opportunity).
- Pair with Catalogue Drift and Amazon Top SKUs Missing on eBay for the listing-level levers.