Seller Signal is a free daily intelligence briefing for professional Amazon FBA sellers, published every weekday morning. Each edition reports verified Amazon policy and fee changes with their per-unit profit impact, PPC and advertising trends, compliance deadlines, and account-health risks — every claim traced to a primary source published in the previous 24-48 hours.
What we cover, in priority order
Every edition is filtered through one question: does this help a seller make a better decision today? Items are ranked by what they threaten or unlock: account suspension risk first, then fee changes with immediate P&L impact, compliance deadlines with penalties, algorithm and advertising shifts, inventory penalties, and finally time-limited opportunities. Everything below is the evergreen reference layer behind the daily editions.
Calculators
Eleven free tools for the decisions that come up daily. Each runs entirely in your browser, stores nothing, and shows the formula in words so you can check the maths yourself.
All eleven calculators
The directory, grouped by profit and pricing, inventory and cost, and advertising and testing.
FBA Profit
Net profit, margin, ROI, and break-even price per unit after the full fee stack.
Break-Even ACoS
The advertising ceiling where a sale stops contributing profit.
Landed Cost
True delivered cost per unit, including freight, duty, prep, and inbound shipping.
Reorder Point
The stock level that should trigger your next purchase order.
Deal Impact
What a Lightning Deal or coupon really costs once cannibalization is counted.
Policy & program updates
The rule changes that move money, tracked across five categories, plus the rumor filter that keeps forum panic out of your decisions.
Policy Updates Hub
How to triage any Amazon announcement in 10 minutes. This is the parent page for the five categories below.
Selling Policies & Account Health
Gating, authenticity documentation, Account Health Rating mechanics, and IP enforcement.
FBA Fee Changes
Read any fee announcement and compute the exact per-unit and monthly P&L impact.
Ads Program Updates
Sponsored Ads, DSP, deals eligibility, and Brand Registry changes that move your ad costs.
Product Compliance
FDA, CPSC, FCC, and customs: which regulator owns your category and what Amazon asks for.
Payments & Disbursements
Reserves, disbursement timing, Seller Wallet, and forecasting the cash you can actually spend.
Rumor Tracker
Confirmed, Monitoring, Unverified, Debunked: how we classify what's circulating before you act on it.
Opportunities, tools & advertising
Where the offense happens: sizing opportunities with real math, choosing software on payback, and running PPC from formulas instead of vibes.
Marketplace Opportunities
The Setup → Math → Fit → Window → Execute framework behind every opportunity we publish.
Tools & Automation
Repricers, forecasting, PPC automation, and compliance software, evaluated on payback, not features.
PPC Insights
CPC trends, break-even ACOS math, placement strategy, and competitive bidding behavior.
International & Cross-Border
Expansion decisions, VAT and GST obligations, currency costs, and cross-border logistics programs.
Account defense & community signal
The existential-risk beat: suspension prevention, compliance escalation, and the forum patterns that surface problems before Amazon emails you.
Account Health Alerts
The metrics that get accounts suspended, how enforcement escalates, and a daily monitoring routine.
Community Pulse
Reading seller forums as an early-warning system: signals, workarounds, and mistake patterns.
Market intelligence
The longer view: what your business is worth, what's coming on the calendar, and the benchmark numbers to steer by.
Exits & Acquisitions
SDE multiples, aggregator activity, and how to prepare an exit 12 months out.
Seller Calendar
Fee effective dates, Prime Day and Q4 windows, and working backward from immovable deadlines.
Key Metrics
CPC, ACOS, fee baselines, and storage rates, and how to use benchmarks without misreading them.
The daily briefing & blog
Briefing Archive
Every published edition and analysis post, newest first, with the eleven standing sections explained.
Q4 2026 Prep Playbook
New analysis post: working backward from the holiday cutoffs to order-by dates, storage math, and the cash bridge.
Sample Edition: August 28, 2026
A complete sample briefing showing the format: top story, policy updates, rumor filter, watch list.
Subscribe
Get the briefing by email every weekday morning, free.
About this site
About Seller Signal
Who writes the briefing and the verification standards behind every item.
Contact
Corrections, tips, and questions: how to reach the desk.
Search
Search every page on the site by keyword.
Site Map
Every page in one place, organized by section.
Frequently asked questions
What is Seller Signal?
Seller Signal is a free daily intelligence briefing for professional Amazon FBA sellers, published every weekday morning. Each edition covers verified Amazon policy and fee changes with their per-unit profit impact, advertising and PPC shifts, compliance deadlines, and account-health risks, with every claim traced to a primary source.
How often is the briefing published?
Every weekday morning, Monday through Friday. Each edition reports developments from the previous 24-48 hours, so a Monday edition covers the weekend. Editions are archived on the site permanently and stay readable without registration.
Who is the briefing written for?
Sellers running roughly $50K to $5M a year on Amazon, managing 20-500 SKUs on 8-15% net margins. The writing assumes you already understand Seller Central, FBA mechanics, PPC, and compliance, so it skips the explainers and goes straight to what changed and what it costs.
How does Seller Signal verify what it publishes?
Every meaningful claim needs a resolvable source URL, and the primary source is preferred over coverage of it. Confirmed policy changes, forum reports, and unverified discussion are labelled separately, and anything circulating without confirmation goes in the noise filter with a status rather than into the main sections.
What does the briefing cost?
Nothing. The daily email is free, the full archive is open, and there is no paid tier. The site carries advertising placeholders rather than a subscription wall.