The FBA Command Playbook: Launching Your First Product on Amazon US

Prepared 2026-07-14 for a new seller targeting beauty, fitness, and household, with ~30-day supplier lead times and no seller account yet. Every claim below is labeled: verified means it survived adversarial verification against primary sources during our research passes; secondary source means it comes from a reputable industry publication but was not primary-verified; practitioner standard means it is widely accepted operating doctrine rather than a checkable fact.

Executive summary

The recommended stack is simple: use the FBA Command dashboard as your research cockpit, back it with a Jungle Scout entry plan (from $29/month on annual billing) for sales estimates, add Keepa's API Starter tier (49 EUR/month) when you want automated historical data, and unlock Amazon's free first-party tools (Product Opportunity Explorer, then Brand Analytics) as soon as you have a Professional account and a trademark on file. The verified category data points away from beauty as a first product: Health & Household led Amazon US subcategory growth in H1 2025 (20% of the top-100 fastest-growing subcategories, per Momentum Commerce/PMG revenue estimates), Home & Kitchen held 13% with pockets like Bedroom Furniture up 28% year over year, and household-adjacent products carry none of beauty's regulatory weight. Beauty is viable, but under MoCRA you — not your factory — are the FDA "responsible person" the moment your brand goes on the label (verified), and even the small-business exemption excludes eye-area, injected, internal-use, and long-wear products. Your single biggest operational risk with a 30-day supplier pipeline is the squeeze between stockouts and Amazon's low-inventory-level fee: the fee triggers when both your 30-day and 90-day days-of-supply fall below 28 (verified), which means your true inventory floor is about four weeks of cover and your reorder trigger must sit near 58+ days of remaining cover. Overstock has a hard cost too — aged-inventory surcharges begin at 181 days in storage (secondary sources put the first band around $0.50 per cubic foot) — so the sweet spot is holding 30-90 days of cover at all times. On fees, budget for the January 15, 2026 fulfillment-fee increases plus the additive 3.5% surcharge that took effect April 17, 2026 and is excluded from the published rate cards (verified). The two compliance gotchas that catch new sellers: MoCRA duties if you touch beauty, and Amazon's requirement that you carry $1,000,000 in commercial liability insurance within 30 days of exceeding $10,000 in gross monthly sales (verified). Plan roughly $8,000-$15,000 in starting capital for a competitive launch (secondary source), and expect each order cycle to lock up cash for two to three months.

The data stack: where the numbers come from

The first thing to internalize: there is no free public "Amazon sales by product" API. None. Amazon does not publish per-ASIN sales figures anywhere. Every "estimated monthly sales" number you see in any tool is a model output, and the models disagree materially — in one documented 3-ASIN test, Helium 10 and Jungle Scout diverged by roughly 2x on the same product (verified as a report of that test, which is itself weak n=3 evidence; treat it as proof of disagreement, not of either tool's superiority). Amazon's own monthlySold ("bought in past month") field, surfaced by Keepa, is real Amazon-reported data but only a floor shown in coarse buckets.

Recommended starter stack for you:

1. Now (no account yet): Jungle Scout Starter at $29/month annual for sales estimates and keyword volume, feeding the FBA Command dashboard. It is one-third the price of Helium 10's cheapest paid tier for the research features a beginner actually uses.
2. When you want automation: Keepa API Starter at 49 EUR/month. One token generally retrieves one product's full history; 20 tokens/minute is plenty for tracking a few hundred ASINs. Remember tokens expire hourly — throughput is capped by the per-minute rate, so you cannot bank a month of quota for one big crawl (verified).
3. Once you open a Professional account ($39.99/month, practitioner standard): Product Opportunity Explorer, free, immediately.
4. Once your trademark application is pending and Brand Registry is approved: Brand Analytics Search Query Performance and Top Search Terms, free. At that point you can cancel or downgrade third-party keyword tools if budget is tight.

Cross-check every sales estimate against at least two of: Jungle Scout's estimate, Keepa's monthlySold floor, and review velocity. Any single number is a guess.

Metrics that actually predict a winner

The BSR power law. Every "estimated monthly sales" figure is built on the same mechanic: sales rank converts to unit sales via a Pareto power law of the form log Q = alpha + beta x log(rank), with alpha and beta calibrated per category (verified against the peer-reviewed Ghose & Sundararajan work; the canonical 2005 calibration on consumer software gave alpha = 8.352, beta = -0.828). Two things matter for you: there is no universal formula — a BSR of 5,000 means completely different volumes in Books versus Home & Kitchen — and the published 2005 coefficients must never be applied to today's marketplace. Only the functional form and the per-category calibration approach generalize (verified). This is exactly why estimator tools disagree: they each maintain their own private calibrations.

Demand signals, in order of trustworthiness:

• Amazon-reported monthlySold floors (via Keepa) — real data, coarse buckets.
• Search volume from Product Opportunity Explorer (Amazon first-party, 90/360-day) once you have an account.
• Third-party search volume and sales estimates — useful for ranking options against each other, unreliable as absolute numbers.

Competition signals:

• Review moat: the median review count of page-one competitors. A niche where page-one medians run into the thousands requires years of catch-up; look for niches where several page-one products have under a few hundred reviews (practitioner standard).
• Review velocity: competitors adding reviews fast means the moat is deepening while you source.
• Seller and offer counts: Keepa's offer-count history shows whether a listing is a private-label brand (one seller) or a commodity knife-fight (dozens of sellers sharing a Buy Box).

Margin math is the third leg: demand and weak competition mean nothing if the fee waterfall (next section) leaves under roughly 25-30% net before advertising (practitioner standard threshold).

How the dashboard scores this. The FBA Command opportunity score implements exactly this three-legged model: demand 40%, competition-inverse 35%, margin 25%, with a gated-category penalty applied on top. A high score means strong estimated demand, a shallow review moat, and healthy post-fee margin, minus a haircut if the category requires approval. It is a ranking device built on the same model-based estimates described above — use it to sort candidates, then verify the top handful manually against Keepa history and real listings before spending a dollar.

Beauty vs fitness vs household: the verdict

What the verified numbers say. Momentum Commerce/PMG's analysis of the 100 fastest-growing tier-3 subcategories on Amazon US (H1 2024 vs H1 2025, ranked by absolute revenue change, proprietary revenue estimates — not official Amazon data):

Directionally, eMarketer projects roughly 10% CAGR for Amazon Health & Personal Care through 2027 (cited alongside the verified finding, medium confidence). Note the caveat: "fastest-growing" here is ranked by absolute revenue change, which favors big categories. A widely circulated claim that Skin Care was the fastest-growing beauty subcategory was refuted during verification — do not build a thesis on it. Jungle Scout's annual seller survey consistently shows Home & Kitchen as the most-picked category among existing sellers (secondary source, not primary-verified) — which cuts both ways: proven demand, crowded field.

Compliance burden by category:

• Beauty = heaviest. Under MoCRA, the FDA "responsible person" is the manufacturer, packer, or distributor whose name appears on the label — for a private-label seller, that is you, not your factory (verified). You must list each marketed cosmetic with the FDA, including ingredients, with annual updates; manufacturers must register facilities biennially (verified). There is a small-business exemption (under $1M average gross annual US cosmetic sales over 3 years) covering GMP, registration, and listing — but it does not apply to products contacting the eye's mucus membrane, injected products, products for internal use, or products that alter appearance for more than 24 hours (verified). So no lash serums, ingestible beauty, or long-wear products under the exemption. Expect Amazon gating on topicals as well: invoices from approved suppliers and sometimes lab COAs (practitioner standard; exact requirements vary by subcategory and were not primary-verified).
• Fitness = light. Sports & Outdoors is a flat 15% referral category with no MoCRA-equivalent regime. Watch for niche-specific safety standards (e.g., anything load-bearing) and stay far away from ingestibles/supplements, which are their own compliance world.
• Household = light. General home goods carry the least regulatory surface. Standard product-safety obligations (CPSIA if child-adjacent) apply, but no FDA registration.

Recommendation (judgement, not verified fact): launch your first product in household/home-adjacent, where the verified growth data is strongest relative to compliance cost and where a mistake costs money rather than an FDA problem. Fitness is a reasonable second lane. Enter beauty only deliberately: with the responsible-person duties priced in, a product type that stays inside the small-business exemption carve-outs, and gating documents lined up before you order inventory.

Amazon's 2026 fee stack: your unit economics

Three fee layers hit every unit you sell. All rates below are the non-peak card (January 15 - October 14, 2026); peak-season rates differ.

1. Referral fees (verified, unchanged since January 2024):

The fee applies to the total sales price including shipping and gift wrap (verified).

2. FBA fulfillment fees. Effective January 15, 2026, fees increased (standard-size $10-$50 band up $0.08/unit on average; above-$50 up $0.31) and the rate card was restructured into three price bands (<$10, $10-$50, >$50) across five size tiers (Small standard, Large standard, Small bulky, Large bulky, Extra-large) (verified). Example verified non-peak rates: Small standard at 2 oz or less runs $2.43 / $3.32 / $3.58 across the three bands; Large standard 12-16 oz in the $10-$50 band is $4.60. Products priced under $10 automatically get Low-Price FBA rates averaging $0.86 below standard (verified). Most tiers bill on the greater of unit weight or dimensional weight (L x W x H in inches / 139); only Small standard and Extra-large 150+ lb use unit weight alone (verified) — so a light but boxy product pays as if it were heavy.

3. The April 17, 2026 surcharge. Amazon added a 3.5% fuel and logistics surcharge on FBA fulfillment fees in the US and Canada starting April 17, 2026. It is additive — the published rate cards exclude it — averages roughly $0.17/unit, applies to fulfillment fees only (not referral or storage), and has no announced end date (verified). Model it as permanent; the 2022 fuel surcharge precedent was never rolled back.

Storage (secondary source, not primary-verified): monthly storage runs about $0.78 per cubic foot for standard-size off-peak (January-September) and jumps to about $2.40 per cubic foot October-December, per AMZ Prep's 2026 fee guide. Neither figure survived primary verification; confirm in Seller Central before relying on them.

Worked example: a $24.99 household product, 0.4 kg

0.4 kg is about 14.1 oz. Assuming its dimensions exceed the small-standard envelope (most household goods do), it lands in Large standard, 12-16 oz, $10-$50 band = $4.60 (verified rate). Assume $5.00 landed cost per unit ($3.50 factory + $1.50 freight/duty — your quotes will vary).

The rule this illustrates: on a $25 product, Amazon takes roughly $8.50 (34%) before you pay for the product or a single click. If your landed cost creeps to $8, launch-phase net drops near 12% and one fee change can erase it. Screen candidates for 45%+ contribution before ads (practitioner standard).

Inventory math for a 30-day pipeline

The reorder point formula (practitioner standard — textbook operations math, not Amazon policy):

Reorder point = average daily demand x lead time (days) + safety stock

This is exactly what the FBA Command dashboard implements: it computes a blended daily velocity = 0.7 x your 30-day average + 0.3 x your 7-day average (so a recent spike moves the number but doesn't hijack it), then flags reorder when units on hand fall to velocity x (lead days + safety days). Your lead time input must be the full pipeline: production (~30 days for your suppliers) plus freight plus Amazon check-in, not just the factory quote.

Safety stock (practitioner standard): two common methods —

• Max-minus-average: (max daily sales x max lead time) - (average daily sales x average lead time). Simple, works with sparse data.
• Z-score/service-level: z x standard deviation of demand x sqrt(lead time), where z of about 1.65 gives 95% service. Better once you have months of data.

For a new seller, a blunt 10-14 days of extra cover is a reasonable starting safety margin (practitioner standard).

The verified fee that changes your floor: the low-inventory-level fee. This is the single most important 2026 mechanic for a 30-day pipeline, and it is fully verified against Seller Central:

• It triggers only when both your long-term (90-day) and short-term (30-day) historical days of supply are below 28 days. If either window is at 28 or above, no fee (verified).
• Historical days of supply = average daily inventory on hand / average daily shipped units, computed weekly and, since January 15, 2026, at seller-FNSKU level (verified).
• The per-unit fee, added on top of the fulfillment fee on every shipped unit, ranges $0.32-$2.09 depending on size tier and how low your supply is (bands: 0-<14 / 14-<21 / 21-<28 days). Small standard: $0.89/$0.63/$0.32; Large standard up to 3 lb: $0.97/$0.70/$0.36 (verified).
• Exemptions that matter to you: new Professional sellers are exempt for 365 days after their first inventory is received; new-to-FBA parent products get 180 days (with FBA New Selection enrollment); SKUs selling under 20 units/week are exempt (verified). So you have a one-year grace period — use it to build the discipline before the fee can bite.

What this means in practice: your real inventory floor is ~28 days of cover, not zero. With a 30-day supplier lead time, the arithmetic is unforgiving: to have new stock land before you dip below 28 days, you must place the PO at 28 + 30 = 58 days of remaining cover, plus safety margin — call it 60-70 days in practice. If you wait until the dashboard shows 30 days of cover, the fee window is already unavoidable (or, post-grace-period, you're paying it).

Overstock costs too. The aged-inventory surcharge starts at 181+ days in a fulfillment center, on top of monthly storage. Secondary sources conflict on the exact 2026 bands: the widely reported schedule starts around $0.50 per cubic foot at 181-210 days, escalates sharply after 270 days (reported anywhere from $3.80 to $5.45 per cubic foot), and past 12 months reaches per-unit minimums — AMZ Prep reports $6.90/cu ft or $0.30/unit at 12-15 months and a new 15+ month tier at $7.90/cu ft or $0.35/unit for 2026 (all secondary, not primary-verified; the official schedule was login-gated to our verifiers — check Seller Central before trusting any third-party table, including this one).

The sweet spot: keep 30-90 days of cover on hand. Below ~28 days you risk the low-inventory fee (after your grace year) and, worse, a stockout that kills your organic rank. Above ~120 days you're drifting toward storage bleed and the 181-day surcharge cliff. Order sizes of roughly 60-90 days of expected demand, reordered at the 58+ day trigger, keep you in the band.

Launch and growth playbook

Account and brand foundations:

• Open a Professional account at $39.99/month (practitioner standard pricing; also required for SP-API private apps and effectively for Product Opportunity Explorer — both verified). The Individual plan cannot register SP-API applications (verified).
• File your trademark early — before you order inventory. Brand Registry accepts a pending trademark application, not just a registered one (verified), and the program itself is free — the real cost of Amazon's brand-gated tooling is the USPTO filing (verified). USPTO base fees are $350 per class, with possible $100-$200 per-class surcharges for non-standard applications (secondary source: USPTO fee schedule as reported for 2026). A trademark filed today gets you Brand Registry in weeks, not the 8-12+ months registration takes.
• Brand Registry unlocks Brand Analytics (Search Query Performance, Top Search Terms), A+ Content, Amazon Vine, Manage Your Experiments, Amazon Attribution, and Brand Metrics (verified).

Insurance trigger (verified): the moment you exceed $10,000 in gross monthly sales, you have 30 days to carry commercial liability insurance of at least $1,000,000 per occurrence and aggregate, naming Amazon.com Services LLC as additional insured, deductible no more than $10,000. A decent launch can cross $10k/month in month two or three — get quotes before launch, not after the email arrives. Budget roughly $500-$1,500/year (practitioner standard).

Reviews and Vine: Vine requires Brand Registry, FBA fulfillment, and fewer than 30 reviews on the ASIN (verified). Enrollment pricing is tiered at $0 / $75 / $200 per parent ASIN for up to 2 / 10 / 30 reviews, charged about seven days after the first Vine review posts (secondary source — Amazon's fee page is login-gated; figures corroborated across multiple 2026 guides). Remember you also give away the units, so the true cost per review is 2-4x the fee (secondary source). Enroll at launch: 10-30 early reviews are the difference between PPC that converts and PPC that burns.

PPC structure (practitioner standard throughout):

• Start with one auto campaign per product at a modest daily budget ($20-$50) purely to harvest search terms.
• Weekly, migrate converting search terms into manual exact-match campaigns with controlled bids; add non-converters as negative keywords in the auto campaign.
• Layer phrase/broad match later for discovery. Keep branded terms separate.
• Benchmarks (secondary sources: Ad Badger, Trellis, and peers, 2026): average ACoS runs roughly 25-36%; 30-50% ACoS is acceptable during launch, 15-25% is the mature target; steady-state TACoS of 10-15% is healthy, with launch-phase TACoS of 25-40% fine if it trends down as organic rank builds. These are directional, not primary-verified.
• Expect the first 60-90 days of PPC to be an investment in rank, not profit.

Startup capital: plan $8,000-$15,000 for a competitive private-label launch — roughly $2,000-$8,000 initial inventory, $1,500-$5,000 for 90 days of PPC, $500-$2,500 photography/content, plus trademark, samples, and buffer (secondary source: EvolveAMZ 2026 launch-cost breakdown; this figure did not survive primary verification). For contrast, Jungle Scout's seller survey found typical starters spending $2,500-$5,000 (secondary source) — the gap reflects lean launches versus competitive ones. Budget-conscious launches near $3,000-$5,000 are possible but concede speed and ad presence.

The cash-flow trap — model this before your first PO. Standard supplier terms are 30% deposit at order, 70% at shipment (practitioner standard). Walk the calendar for a $6,000 inventory order:

• Day 0: pay $1,800 deposit. Production runs ~30 days.
• Day 30: pay $4,200 balance. Freight + Amazon check-in takes ~2-4 weeks.
• Day 50-60: product goes live. Sales begin, but Amazon disburses on a ~2-week cycle with reserves (practitioner standard), so first meaningful cash arrives around day 70-80.
• Meanwhile, to avoid the stockout math above, you must place the next PO around day 60-75 — before the first order has paid you back.

Net effect: cash is locked roughly 2-3 months per order cycle, and a growing single product needs about two full order cycles of working capital in flight at all times. This — not product selection — is what quietly kills otherwise-healthy first-year sellers (practitioner consensus; no verified failure-rate statistics exist, see below).

Common failure modes

No rigorous failure-rate statistics for new FBA sellers survived verification in either research pass — the popular "90% fail" numbers are unsourced marketing. The mechanisms below are real; the labels tell you how solid each one is.

1. The stockout spiral (mechanics verified, dynamics practitioner consensus). You sell out, organic rank decays, you restock into weaker demand, PPC has to rebuy the rank you already paid for. With 30-day lead times, one late reorder can cost a quarter of momentum. The low-inventory-level fee (verified) now fines you on the way into a stockout: $0.32-$2.09 per unit shipped while your cover is under 28 days.
2. Overstock and aged-inventory bleed (fee existence verified at 181+ days; rates secondary). Ordering 6-12 months of stock to get a better unit price trades a visible saving for invisible storage drag and a surcharge cliff, plus all the cash-flow lockup from the section above.
3. Launching into a review moat (practitioner standard). If page one's median product has 2,000+ reviews, you are buying every early sale with ads against competitors whose social proof converts 2-3x better. The dashboard's competition-inverse component (35% of the score) exists to catch this — respect it.
4. Ignoring gating and compliance (MoCRA duties and insurance trigger verified). Ordering beauty inventory before confirming ungating documents and MoCRA responsibilities can strand your entire first order. The $1M insurance requirement at $10k/month is not optional and arrives fast.
5. Underpricing PPC (practitioner standard). Budgeting $10/day against categories where launch ACoS runs 30-50% means too little data to optimize and too few sales to rank. Better to launch one product with a real ad budget than two products starved.
6. Single-SKU cash-flow crunch (practitioner standard). All capital in one product means the day-60 second PO and the first restock collide with zero revenue cushion. Keep a contingency reserve ($500-$2,000 per the secondary-source launch budget) untouched.
7. Trusting one estimator (estimator disagreement verified). Tools diverged ~2x on the same ASIN in the one documented head-to-head. Any buy decision resting on a single tool's monthly-sales number is resting on a modeling assumption you cannot see. Triangulate: estimate + Keepa monthlySold floor + review velocity.

Your next 10 moves

1. Research in the dashboard. Shortlist 10-15 candidate niches in household/fitness using the opportunity score; demand solid, page-one review medians low, contribution margin at or above 45% before ads. Verify the top 3-5 manually against Keepa histories and Jungle Scout estimates — never one source alone.
2. Pick the niche and define the product. Household/home-adjacent first (our judgement, per the category verdict). Write down the differentiation you'll build (bundle, size, material, fix for the top complaint in competitor reviews via Product Opportunity Explorer's review-sentiment data once available).
3. File the USPTO trademark now (base $350/class, secondary). A pending application is enough for Brand Registry (verified), and everything good — Brand Analytics, Vine, A+ — sits behind it.
4. Open the Professional seller account ($39.99/month) and turn on Product Opportunity Explorer the same day. Enroll in Brand Registry as soon as the trademark application number exists.
5. Sample 3+ suppliers. Pay for samples, test them hard, get quotes with full landed cost (unit + freight + duty), and confirm 30% / 70% payment terms and true door-to-door lead time in writing.
6. Run the compliance check for your category. Household: safety standards and labeling. Fitness: same plus any load-bearing claims. Beauty (if ever): MoCRA responsible-person listing plan, exemption carve-out check, ungating invoices ready before the PO. Get liability-insurance quotes now so the $10k/month trigger is a formality.
7. Size the first order with the reorder math. Order 60-90 days of estimated demand (not six months). Compute your reorder point now: blended daily velocity x (lead days + safety days) — with a 30-day lead, plan to reorder at ~58-70 days of remaining cover.
8. Build the listing and launch. Professional photography, keyword-complete title and bullets from your research tools, A+ content once Brand Registry clears. Price inside the $10-$50 band your fee math assumed.
9. Enroll in Vine and start PPC on day one. Vine at the tier your budget allows ($0/$75/$200 per parent ASIN for 2/10/30 reviews, secondary); auto campaign at $20-$50/day, weekly harvest into manual exact, negatives on non-converters. Accept 30-50% ACoS while reviews accumulate; watch TACoS trend, not daily ACoS.
10. Track everything in the dashboard and reorder on the trigger, not on vibes. Watch days-of-supply weekly (Amazon computes your fee exposure weekly at FNSKU level — verified), keep 30-90 days of cover, place PO #2 before PO #1 has paid you back, and bank the 365-day new-seller exemption year to make the discipline automatic.

Sources and confidence

Verified primary (survived adversarial verification against primary sources)

• https://developer-docs.amazon.com/sp-api/docs/sp-api-registration-overview — SP-API's three application types; Professional account required for private seller apps.
• https://keepa.com/#!api — Keepa API feature set (no sales estimates, no search volume), token pricing tiers 49-11,099 EUR/month, one-hour token expiry.
• https://dataforseo.com/pricing/merchant/amazon-api — DataForSEO pay-per-request pricing ($0.0015 / $0.003 / $0.005 per task).
• https://www.helium10.com/pricing/ — Helium 10 tiers $99/$279/from $1,499; API Enterprise-only.
• https://arxiv.org/pdf/math/0609170 — the BSR-to-sales power law (log Q = alpha + beta log rank), category calibration requirement, 2005 coefficients.
• https://www.momentumcommerce.com/fastest-growing-amazon-categories-2025/ (and PMG mirror) — Health & Household 20% / Home & Kitchen 13% of top-100 fastest-growing subcategories H1 2025; Bedroom Furniture +28%.
• https://www.fda.gov/cosmetics/cosmetics-laws-regulations/modernization-cosmetics-regulation-act-2022-mocra and https://www.law.cornell.edu/uscode/text/21/364 — MoCRA responsible-person definition, listing duties, small-business exemption and its carve-outs.
• https://sellercentral.amazon.com/help/hub/reference/external/G200386300 — $1,000,000 liability insurance within 30 days of exceeding $10,000 gross monthly sales.
• https://sellercentral.amazon.com/help/hub/reference/external/GABBX6GZPA8MSZGW — January 15, 2026 fulfillment-fee increases, three price bands, five size tiers, April 17, 2026 3.5% surcharge (additive, excluded from rate cards).
• https://sellercentral.amazon.com/help/hub/reference/external/GTG4BAWSY39Z98Z3 and https://sell.amazon.com/pricing — 2026 referral fees: Beauty/Health & Personal Care 8%/15% at the $10 threshold; Home & Kitchen and Sports & Outdoors 15%; $0.30 minimum.
• https://sellercentral.amazon.com/help/hub/reference/external/GV43F6S76Y9DHYRH — low-inventory-level fee: both-windows-below-28-days trigger, weekly FNSKU-level computation, $0.32-$2.09 rates, 365-day new-Professional-seller exemption.
• https://sell.amazon.com/tools/product-opportunity-explorer — POE access (no Brand Registry needed) and data coverage.
• https://sell.amazon.com/tools/amazon-brand-analytics — Brand Analytics access requirements; SQP and Top Search Terms contents.
• https://sell.amazon.com/brand-registry — Brand Registry free; registered or pending trademark accepted; tools unlocked (Brand Analytics, Vine, A+ Content, Experiments, Attribution, Brand Metrics).
• https://developer-docs.amazon.com/sp-api/docs/data-kiosk-api — Data Kiosk GraphQL query model (its access-role specifics were refuted; see below).
• https://revenuegeeks.com/helium10-vs-jungle-scout/ — verified only as an accurate report of its own 3-ASIN estimator test showing ~2x tool disagreement (n=3; weak evidence beyond the disagreement itself).

Secondary (reputable but not primary-verified — treat as provisional)

• Aged-inventory surcharge schedule: starts ~$0.50/cu ft at 181-210 days, escalates after 270 days, per-unit minimums past 12 months — AMZ Prep (https://amzprep.com/amazon-fba-fees/), Inventory Hero (https://www.inventoryhero.ai/guides/amazon-aged-inventory-surcharge-2026), GETIDA (https://getida.com/resources/blog/fba-reimbursements/amazon-fba-storage-fees/). Sources conflict on exact 2026 bands — confirm in Seller Central.
• Monthly storage rates (~$0.78/cu ft off-peak, ~$2.40 peak, standard-size): AMZ Prep (https://amzprep.com/amazon-fba-fees/).
• Vine tiers $0/$75/$200 per parent ASIN for 2/10/30 reviews: SalesDuo (https://salesduo.com/blog/amazon-vine-program-guide/), BellaVix (https://www.bellavix.com/amazon-vine-program-costs-in-2026-what-sellers-and-vendors-need-to-know/), Nova Data (https://novadata.io/resources/blog/amazon-vine-program-true-cost). Amazon's own fee page is login-gated.
• Startup capital $8,000-$15,000 for a competitive launch: EvolveAMZ (https://evolveamz.com/amazon-fba-launch-costs-2026/); Jungle Scout survey data suggests typical lean starts of $2,500-$5,000 (https://www.junglescout.com/resources/articles/how-much-does-it-cost-to-sell-on-amazon/).
• ACoS/TACoS benchmarks (25-36% average ACoS; 30-50% launch; 10-15% steady-state TACoS): Ad Badger (https://www.adbadger.com/blog/amazon-advertising-stats/), Trellis (https://gotrellis.com/resources/blog/amazon-advertising-benchmarks/).
• USPTO trademark base fee $350/class plus possible $100-$200 surcharges: USPTO fee information (https://www.uspto.gov/trademarks/trademark-fee-information), as reported for 2026.
• Practitioner standards throughout (reorder-point and safety-stock formulas, PPC auto-to-manual harvesting, 30%/70% supplier terms, $39.99/month Professional plan, ~2-week disbursement cycles) are standard operating doctrine, not Amazon-policy citations.

Refuted during verification — do not believe these

• "Keepa costs 19 EUR/month" — refuted 0-3. Keepa API pricing starts at 49 EUR/month; the 19 EUR figure came from an unreliable comparison blog.
• "Keepa tracks over 4 billion products / Helium 10 has 2 billion" — refuted 0-3. Vendor-scale numbers from the same unreliable blog.
• "Skin Care was the fastest-growing beauty subcategory (+7% YoY)" — refuted 1-2. Do not use this to justify a beauty-first launch.
• "Every Data Kiosk operation requires the Brand Analytics SP-API role" and "Seller Sales & Traffic is Data Kiosk's only dataset" — both refuted 0-3. Data Kiosk access-role and dataset-scope specifics remain unverified.