Something unusual has been happening inside Amazon’s Buy Box engine since late Q1 2026, and a growing number of high-volume sellers are pointing fingers at the same culprit: Amazon itself. Sources close to the matter say the company has made undisclosed changes to its Buy Box eligibility algorithm that are disproportionately penalizing sellers who rely on third-party AI repricers — tools like Feedvisor, Informed.co, and BQool that have long been central to winning the coveted placement.
“We saw our Buy Box win rate drop from 74% to 51% in a six-week window in March,” said one seven-figure private label seller who asked to remain anonymous. “We hadn’t changed our pricing strategy, our inventory levels, or our fulfillment model. The only variable was the repricer.” The seller, who runs roughly $4.2M in annual Amazon revenue across 38 ASINs, said they’ve since reverted to manual repricing on their top 10 SKUs and seen partial recovery.
Unconfirmed reports across several Amazon seller communities — including the Seller Central forums, the FBA Masterminds Facebook group, and theIllion Dollar Sellers Slack — describe similar patterns. Multiple operators report that repricing velocity, specifically the frequency of price changes triggered by third-party tools, appears to be triggering algorithmic suppression rather than the Buy Box optimization it once delivered.
Is Amazon Deliberately Neutering Third-Party Repricers?
The theory gaining traction in seller circles is that Amazon’s algorithm now treats high-frequency repricing as a negative signal — possibly flagging it as price manipulation or destabilizing behavior in competitive categories. Sources familiar with Amazon’s Buy Box engineering say the company has been refining what it calls “price stability scoring” since at least mid-2025, allegedly weighting sellers who hold consistent prices more favorably than those whose listings fluctuate dozens of times per day.
“Amazon has always claimed to favor the lowest price, but what they actually optimize for is the most reliable customer experience,” said Will Tjernlund, a well-known Amazon consultant and co-founder of Goat Consulting, in a statement that stopped short of confirming the specific algorithm change. “If repricing tools are creating chaotic price swings, it wouldn’t shock me if Amazon quietly started penalizing that behavior.”
“We saw our Buy Box win rate drop from 74% to 51% in a six-week window. We hadn’t changed our pricing, inventory, or fulfillment. The only variable was the repricer.” — Anonymous seven-figure Amazon seller
Amazon has not publicly commented on any algorithm changes related to Buy Box eligibility or third-party repricing tools. A spokesperson declined to respond to specific questions submitted by Ecommerce Times. Feedvisor also declined to comment on the record. Informed.co did not respond to a request for comment by press time.
Which Repricers Are Reportedly Being Hit Hardest?
According to sources who manage multi-seller accounts at Amazon agencies, the tools allegedly most affected tend to be those that execute the highest repricing frequency — some updating prices every 2 to 5 minutes across hundreds of ASINs. Feedvisor, which positions itself as an AI-driven revenue intelligence platform and counts enterprise-level sellers among its client base, is reportedly fielding an elevated volume of support tickets related to Buy Box anomalies since February.
BQool, the Taiwan-based repricing tool popular among mid-market FBA sellers for its aggressive price-matching speed, reportedly saw a spike in churn inquiries in April, according to one agency operator who manages accounts for six BQool clients. The operator, who requested anonymity, said three of those clients have paused their BQool subscriptions pending investigation.
Tools with slower repricing cadences — including Seller Snap, which uses game-theory-based pricing logic and tends to make fewer but more strategic adjustments — appear to be less affected, if seller anecdotes are any indication. Seller Snap’s co-founder Ari Aronson was not available for comment, but one Seller Snap customer told Ecommerce Times their Buy Box metrics have remained stable throughout the period in question.
- Feedvisor: Enterprise-tier repricer reportedly receiving elevated support tickets on Buy Box anomalies since February 2026
- Informed.co: Mid-market repricer; sellers in multiple forums report win rate drops on high-velocity SKUs
- BQool: Popular for aggressive repricing speed; at least one agency reports client churn inquiries in April
- Seller Snap: Game-theory-based, lower repricing frequency; reportedly less impacted per seller accounts
Could This Be a Prelude to Amazon Launching Its Own Repricing Product?
The more provocative theory circulating among Amazon consultants and agency operators is that the alleged suppression isn’t accidental — it’s strategic. Amazon already offers its own automated pricing tool natively inside Seller Central, free of charge, though it has historically been considered too blunt for serious sellers. Some sources suggest the company may be preparing a significantly upgraded version, potentially powered by the same machine learning infrastructure behind its own first-party pricing operations.
“Amazon has every incentive to own the repricing layer,” said Robyn Johnson, founder of Marketplace Blueprint and a longtime Amazon strategy consultant. “It keeps more data in-house, it reduces the volatility that third-party tools create, and frankly it’s another way to make sellers dependent on Amazon’s own ecosystem rather than external vendors.”
“Amazon has every incentive to own the repricing layer. It keeps more data in-house, reduces volatility, and makes sellers more dependent on Amazon’s own ecosystem.” — Robyn Johnson, Marketplace Blueprint
This wouldn’t be the first time Amazon has allegedly leveraged algorithm changes to disadvantage third-party service providers competing in its orbit. Sellers and antitrust observers have long pointed to Amazon’s historical treatment of third-party logistics providers, review aggregation tools, and even listing optimization software as precedents for using platform mechanics to tilt the playing field.
What Are Sellers Actually Doing Right Now?
The practical fallout is already shaping seller behavior. According to conversations with a dozen FBA operators and three Amazon-focused agencies, here’s what’s reportedly happening on the ground:
- Several high-volume sellers are A/B testing manual repricing versus tool-driven repricing across matched ASINs to establish causality
- At least two agencies — one based in Austin, one in London — have issued internal advisories recommending clients reduce repricing frequency below 15 changes per 24-hour period as a precautionary measure
- A subset of sellers are reportedly experimenting with Seller Snap and Quartile’s newer repricing module as lower-velocity alternatives
- Some sellers are leaning harder into FBA-exclusive SKUs, reasoning that fulfillment quality signals may offset pricing volatility penalties
- Forum threads on Seller Central and Reddit’s r/FulfillmentByAmazon have collectively accumulated over 2,400 comments discussing the anomaly since March
Importantly, not all sellers are convinced the issue is algorithm-driven. Some data-minded operators argue that Q1 2026’s broader competitive dynamics — including a wave of Chinese sellers returning aggressively after tariff adjustments and a surge in new FBA entrants following Amazon’s February seller fee restructuring — may simply be flooding more listings with competitive pricing, making Buy Box wins harder to sustain at historical rates regardless of repricing tool.
Is Amazon’s Fee Restructuring Compounding the Problem?
Amazon’s February 2026 FBA fee changes are also complicating the picture. The company adjusted fulfillment fees for oversize categories and introduced new inbound placement fees for sellers using fewer than three receive locations, moves that squeezed already-thin margins on commodity SKUs. For sellers operating in highly competitive niches — consumer electronics accessories, kitchen tools, supplements — the margin compression may be interacting badly with any repricing instability, creating a compounding effect on Buy Box eligibility scores that factor in seller-fulfilled price competitiveness relative to category benchmarks.
“When your margin drops 3 points because of inbound placement fees and your Buy Box win rate drops 20 points because of alleged algorithm changes, you’re looking at a revenue problem that can wipe out a whole product line,” said one seller in the outdoor accessories category who estimated a $180,000 annualized revenue impact from the combined effect since January.
“When your margin drops 3 points from fee changes and your Buy Box win rate drops 20 points, you’re looking at a revenue problem that can wipe out a whole product line.” — Anonymous outdoor accessories seller
What Should Sellers Do While This Plays Out?
The consensus among consultants who spoke to Ecommerce Times is cautious but actionable. Sellers are advised to pull 90-day Buy Box percentage data from their Business Reports dashboard and segment by ASIN, comparing win rates before and after February 1, 2026. If there’s a clear inflection point, the next step is to pause repricing on a control group of SKUs for two to three weeks and monitor for recovery.
“Don’t blow up your whole repricing stack based on forum chatter,” said Johnson. “But do run a controlled test. If you’re losing Buy Box at a rate that doesn’t correlate with your competitive position, you need to know whether it’s the tool, the frequency, or something else.”
What’s clear is that the third-party repricing software market — worth an estimated $380 million annually across subscription and managed service revenue, according to industry estimates — is watching this situation very closely. If Amazon is indeed quietly repositioning its native pricing tools as a superior alternative, the implications for Feedvisor, Informed.co, BQool, and the rest of the category could be significant.
Amazon’s Q2 seller tools briefing, reportedly scheduled for mid-June, may offer the first official hint of where the company’s repricing product roadmap is headed. Until then, sellers are left running their own experiments — and watching their Buy Box percentages like hawks.
