Every Amazon seller has either lived this story or watched a friend live it: a product looked great in the research tool, the seller wired $14,000 to a supplier, and four months later the inventory is sitting in a 3PL, stuck behind a price war they didn't see coming.
Validation is the cheapest insurance in the FBA business. A weekend of careful work can save you a five-figure mistake. Here's the framework we recommend inside Sellar — seven checks, in order, with a pass/fail gate at each one.
1. Demand — is there enough oxygen?
Start with the main keyword. You want 2,000+ monthly searches in your target marketplace, with a trend line that's flat or rising over the last 12 months. Confirm the demand is broad: at least 3 related keyword variants should pull 1,000+ searches each. A single hot keyword can collapse overnight. A cluster of steady ones is a category.
Gate: if total addressable monthly search volume is under 5,000, stop here unless the product is high-margin and low-competition.
2. Competition — can a new entrant break in?
Pull the top 10 listings. Calculate the median review count. Under 500: clearly beatable. 500–1,500: beatable with strong execution and a 6-month PPC budget. Over 1,500: you're buying market share, not earning it.
Then check brand density. If the top 10 is mostly Anker, Bose, OXO, or other household names, private label is a slow death. You want a top 10 dominated by generic FBA sellers — that's a category still up for grabs.
Gate: at least 5 of the top 10 should be private-label sellers, not established brands.
3. Margins — does the math survive reality?
Build a margin model with pessimistic assumptions:
- Sell price: 10% below current average (price wars happen)
- Amazon referral fee: 15%
- FBA fee: from the size tier estimate
- Landed cost: supplier quote × 1.3 (freight, duties, inspection)
- PPC: 15% of revenue for year one
- Returns and damaged units: 5%
Gate: if net margin is under 20% with these assumptions, the product won't survive its first crisis.
4. Reviews — what are buyers actually saying?
Read 30 reviews across the top 5 listings. Focus on 3-star reviews. Pattern out the top three complaints. If they're easy to fix (better packaging, clearer instructions, an extra accessory), that's your differentiation. If they're structural to the product category (it breaks, it leaks, it's the wrong size for most buyers), the whole category is a trap.
Gate: you must be able to write a one-sentence promise your version delivers that the top sellers don't.
5. Pricing power — where can you actually land?
Check the price spread of the top 10. A tight spread ($18–$22) means commoditized pricing — you compete on cost and ads. A wide spread ($18–$45) means buyers value differentiation, and a premium positioning is possible.
Also look at the price history (Keepa is fine for this). If prices have trended down 20%+ over the last year, you're entering a deflating market. If prices are flat or rising, the category has healthy demand.
Gate: the price band must support your target margin even after a 10% drop.
6. Seasonality — is the demand year-round?
Pull the 12-month search trend. Look for a curve, not a cliff. A 2× spike in November is fine — that's a holiday lift. A 10× spike from October to December and near-zero the rest of the year means your inventory will sit for 9 months. Cash tied up in seasonal inventory is the silent killer of FBA businesses.
Gate: the lowest-volume month should be at least 30% of the highest-volume month.
7. Risk — what could go wrong in 90 days?
Final sanity check. Ask yourself:
- Is this category restricted or about to be? (Supplements, electronics, baby.)
- Are there active IP / patent claims in the top results?
- Is there a single dominant brand that could undercut everyone with a coupon?
- Is the product fragile, oversized, or hazmat?
Gate: if you can't honestly answer "no major risks" to all four, reduce your first order size — or pick a different product.
What "validated" actually means
A validated product clears all seven gates with documented evidence. Not a feeling. Not a gut call. Notes you could hand to a partner. If you can't write the one-page summary, you haven't validated — you've just researched.
Sellar runs this exact framework for you. Paste an ASIN or a niche keyword and you'll get the seven-check breakdown, the margin model, and a plain-English go/no-go recommendation before you ever email a supplier.
Try Sellar free
Sellar gives Amazon sellers a faster way to research products, validate demand, and prepare cleaner listing content — without juggling five different tools. Free to start, no credit card required.