> ## Documentation Index > Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt > Use this file to discover all available pages before exploring further. # Buy-Box Win Rate (top-50 ASINs), Amazon Seller Central > Buy-Box Win Rate (top-50 ASINs) for Amazon Seller Central. Tracked live in Vortex IQ Nerve Centre. How to read it, why it matters, and how to act on it. **Card class:** [Non-Hero](/nerve-centre/overview#card-classes-explained) • **Category:** [Marketplace](/nerve-centre/connectors#connectors-by-type) ## At a glance > The percentage of time you hold the Buy Box across your 50 highest-revenue ASINs. The Buy Box is the featured offer behind "Add to Cart", and the large majority of Amazon sales flow through it, so on a competitive listing this single percentage is one of the strongest predictors of whether your sales hold up. Where [Buy-Box Loss Burst](/nerve-centre/kpi-cards/amazon-seller/buy-box-loss-burst) catches a sudden crisis, this gauge is the steady-state health read on your most important listings. | | | | ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | **What it counts** | The share of Buy-Box-eligible time (or sessions) you win across the top-50 ASINs by revenue, expressed as a 0 to 100% rate. A high rate means you are the featured offer most of the time on your best products. | | **Why top-50 revenue** | Buy-Box win rate matters most where revenue is concentrated. Tracking it across the whole catalogue dilutes the signal; the top-50 view keeps it focused on the ASINs that actually drive sales. | | **Sampling note** | The card samples the top-50 revenue ASINs and the result is cached for several hours to respect SP-API rate limits. It is a representative health read, not a continuous per-second measurement of every ASIN. | | **What moves it** | Your price versus competing offers, your fulfilment method (FBA / Prime eligibility helps), your seller metrics and account health, inventory availability, and the number and aggressiveness of competing third-party offers. | | **Why it matters** | Losing the Buy Box on a top ASIN is close to losing the sale. A win rate below the target means a meaningful slice of demand on your best products is going to competitors. | | **Fulfilment scope** | All fulfilment, but FBA / Prime eligibility is a strong positive factor in winning the Buy Box, so a heavily FBM catalogue may show a lower rate on contested listings. | | **Time window** | `RT/7D vsP` (a real-time read with a 7-day comparison against the prior period) | | **Alert trigger** | `<85%`. A win rate below 85% across the top-50 flips the gauge and notifies owner, marketing, and finance. | | **Roles** | owner, marketing, finance | ## Calculation Calculated automatically from your Amazon Seller Central data. Top-50 revenue ASINs are sampled and the result is cached for several hours to respect SP-API rate limits. 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-goods seller, mixed FBA and FBM on amazon.com. Snapshot taken 17 Mar 26, with a 7-day comparison. | Segment of top-50 | Avg Buy-Box win rate | Note | | ---------------------------------------- | -------------------- | --------------------------------------------- | | FBA ASINs (32 of 50) | 94% | Prime eligibility helps win the Buy Box | | FBM ASINs (18 of 50) | 67% | competing against Prime offers and 3P sellers | | **Buy-Box Win Rate (top-50, this card)** | **\~84%** | weighted across the 50 | ```text theme={null} Blended win rate (top-50) = ~84% Alert = FIRED (just below the 85% threshold) 7-day comparison = down from ~88% the prior week Where the loss sits = the FBM ASINs (67%), dragging the blend below the threshold ``` Four things to notice: 1. **84% fired the alert, just.** The blended rate slipped under the 85% floor, and the 7-day comparison shows it fell from about 88% the week before. A few points of Buy-Box loss across the top-50 represents real lost sales on the seller's most important listings. 2. **The whole problem is on the FBM side.** FBA ASINs win the Buy Box 94% of the time, helped by Prime eligibility, while the FBM ASINs sit at 67%. The blend hides this; the segmentation reveals that fulfilment method is the lever. Moving the contested FBM ASINs to FBA would likely lift the rate sharply. 3. **The 7-day drop is the actionable signal.** A static 84% is one thing; a 4-point fall in a week suggests a competitor re-priced or new offers appeared. Pair with [Buy-Box Trend (top revenue ASINs)](/nerve-centre/kpi-cards/amazon-seller/buy-box-trend-top-revenue-asins) to see whether the slide is continuing. 4. **The number is a cached sample, not a tick-by-tick feed.** Because Buy-Box state is sampled and cached for several hours to respect rate limits, treat the figure as a reliable health read, not a real-time price-war monitor. For sudden events, the burst card is the live alert. The seller moves the most-contested FBM ASINs to FBA for Prime eligibility and re-prices a handful where the margin allows. The blended win rate climbs back above 88% and the alert clears. ## Sibling cards merchants should reference together Win rate is the steady-state Buy-Box health number. Pair it with the burst, the trend, and the financial impact: | Card | Why pair it with Buy-Box Win Rate | | ---------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | | [Buy-Box Loss Burst](/nerve-centre/kpi-cards/amazon-seller/buy-box-loss-burst) | The crisis alert. This gauge is the steady level; the burst card catches a sudden drop in the same signal. | | [Buy-Box Trend (top revenue ASINs)](/nerve-centre/kpi-cards/amazon-seller/buy-box-trend-top-revenue-asins) | The direction. A single win-rate reading is less useful than knowing whether it is rising or falling. | | [Estimated Revenue Lost to Buy-Box Loss](/nerve-centre/kpi-cards/amazon-seller/estimated-revenue-lost-to-buy-box-loss) | Converts the win-rate gap into a £/\$ figure, the cost of every point of Buy Box you do not hold. | | [Top Buy-Box-Loss ASINs](/nerve-centre/kpi-cards/amazon-seller/top-buy-box-loss-asins) | Names the specific ASINs dragging the rate down so you can act on the right listings. | | [ASINs with Third-Party Offers](/nerve-centre/kpi-cards/amazon-seller/asins-with-third-party-offers) | Competing offers are the main reason you lose the Buy Box. This shows where the competition is. | | [Ad Spend on Out-of-Stock ASINs](/nerve-centre/kpi-cards/amazon-seller/ad-spend-on-out-of-stock-asins) | If you are advertising ASINs where you no longer hold the Buy Box, that spend is largely wasted. Check both. | ## Reconciling against Amazon Seller Central **Where to look in Seller Central:** > **Business Reports → Detail Page Sales and Traffic by Child Item** reports the Buy Box percentage per ASIN over the selected period. > To reconcile, filter to your top-revenue ASINs and average their Buy Box percentages; the result should track this gauge closely, allowing for the card's sampling and caching. The live listing also shows whether you currently hold the featured offer, useful as a spot check on a specific ASIN. **Timing and reporting-lag table:** | Topic | Detail | | ------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Timezone** | Business Reports use the marketplace's local timezone; the card aligns its window consistently. Edge-of-window sessions can shift the reported percentage slightly. | | **Sampling and caching** | The card samples the top-50 revenue ASINs and caches the result for several hours to stay within SP-API rate limits. Amazon's own Buy Box percentage aggregates over the period; minor differences are expected. | | **Eligibility effects** | Buy-Box eligibility depends on price, fulfilment, account health, and inventory. A change in any of these (for example, a stockout) lowers win rate on the affected ASINs. | | **Period comparison** | The 7-day comparison contrasts the current rate with the prior 7 days. A re-pricing event mid-window can make the trend look sharper than a single day's change. | **Why our number may legitimately differ from Seller Central:** | Reason | Direction | Why | | --------------------------- | ----------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- | | **Sampling vs full report** | Either direction | The card samples top-50 revenue ASINs with caching; Amazon's report covers every ASIN over the full period. Aggregates can differ by a small margin. | | **ASIN set definition** | Either direction | If you average Buy Box percentage across a different ASIN set than the card's revenue-ranked top-50, the figures will not match. Use the same set. | | **Caching window** | Ours can lag minutes to hours | Because the read is cached, a very recent Buy-Box change may not be reflected until the next sample. The burst card is the real-time view. | **Cross-connector reconciliation against other connectors the same seller may run:** | Card | Expected relationship | What causes legitimate divergence | | ---------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- | | [`amazon-ads.active-ads-on-no-buy-box-asins`](/nerve-centre/kpi-cards/amazon-ads/active-ads-on-no-buy-box-asins) | **Spend-efficiency tie-in.** A low win rate on advertised ASINs means ad spend is going to listings where a competitor wins the sale. The Ads connector flags these directly. | Different scope; the Ads card focuses on advertised ASINs, this gauge on top-revenue ASINs. They overlap where you advertise your best earners. | | [`ebay.revenue-by-marketplace`](/nerve-centre/kpi-cards/ebay/revenue-by-marketplace) | **Marketplace peer (loose).** eBay has no Buy Box, but the idea of winning the featured / best-match position is analogous. Used as a conceptual peer. | Entirely different mechanics; no shared data. | ## Known limitations / merchant FAQs **What is the Buy Box win rate?** The percentage of eligible time (or sessions) you are the featured offer, the one behind the "Add to Cart" button, across your top-50 revenue ASINs. Because most Amazon sales go through the Buy Box, a high win rate means you are capturing most of the demand on your best products. **Why only the top-50 ASINs?** Because that is where revenue is concentrated and where losing the Buy Box hurts most. A whole-catalogue average dilutes the signal with long-tail ASINs that barely sell. The top-50 view keeps the metric focused and actionable. **Why is the number cached and not real-time?** Buy-Box state on 50 ASINs would require heavy, repeated SP-API calls. To respect Amazon's rate limits, the card samples the top-50 and caches the result for several hours. For sudden, real-time events, use [Buy-Box Loss Burst](/nerve-centre/kpi-cards/amazon-seller/buy-box-loss-burst). **My FBA ASINs win the Buy Box but my FBM ones do not, why?** FBA / Prime eligibility is a strong positive factor in winning the Buy Box. FBM offers competing against Prime-eligible offers, especially at a similar price, often lose. Moving contested FBM ASINs to FBA is one of the most reliable ways to lift win rate. **What is the fastest way to recover Buy Box win rate?** Three levers: price (match or beat the competing offer where margin allows), fulfilment (move to FBA for Prime eligibility), and availability (avoid stockouts, which forfeit the Buy Box). Account health also matters, a healthy account is favoured. **Does losing the Buy Box ever happen with no competitor?** Yes. If your price drifts above the Buy-Box-eligible range, or your account health dips, or you go low on stock, you can lose the Buy Box on your own listing with no third-party offer involved. The fix is to correct the price, metric, or stock. **How do I see the money I am losing?** This gauge gives the rate; [Estimated Revenue Lost to Buy-Box Loss](/nerve-centre/kpi-cards/amazon-seller/estimated-revenue-lost-to-buy-box-loss) converts the gap into a currency figure so you can prioritise the fixes by financial impact. *** ### Tracked live in Vortex IQ Nerve Centre *Buy-Box Win Rate (top-50 ASINs)* is one of hundreds of KPI pulses Vortex IQ tracks across Amazon Seller Central and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. [Start for free](https://app.vortexiq.ai/login) or [book a demo](https://www.vortexiq.ai/contact-us) to see this metric running on your own data.