You found a product you like. Before you send money to a supplier, you need to answer one question with evidence: will enough people buy this, at a price that leaves you a profit?
Validation is the step between "this looks promising" and "I'm ordering 300 units". Here is the checklist we use, and what counts as real evidence at each step.
1. Demand: are people already buying?
Look for two signals that agree:
- Sales history. On Amazon, a product's Best Seller Rank over the last 90 days to 12 months tells you far more than today's rank. A steady rank means steady sales; one spike means a promotion or a seasonal moment.
- Search demand. Monthly searches for the main keyword and close variants. Low search volume can still work for a product you'll sell with ads or video, but you need to know.
- Recent reviews. A steady flow of new reviews on competing listings shows sales are ongoing.
Evidence: a price-and-rank chart and a search volume number with its source and date. "It's trending on TikTok" is a lead, not evidence.
2. Trend: is demand growing, flat or fading?
Compare the last 12 months:
- Rising search interest and an improving sales rank: a growing market.
- Flat: a stable market, which is fine if you can compete.
- Falling, or a sharp peak and decline: a fad. Be careful with large first orders.
3. Competition: can a new seller win sales?
For the top 10 listings, check:
- Review counts. If every leader has thousands of reviews, a new listing will struggle to rank.
- Number of sellers on the same product, and whether they compete on price.
- Listing quality. Poor photos, confusing titles and unanswered complaints are opportunities.
- Complaints. Read the 1–3 star reviews. Repeated complaints tell you exactly how to make a better version.
4. Margin: what is left after every cost?
Calculate profit per unit at the price you can realistically charge, not the highest price you have seen:
| Line | Example (illustrative) |
|---|---|
| Selling price | 29.99 |
| VAT (if the market charges it) | depends on country |
| Product cost from supplier | 6.00 |
| Shipping to warehouse, per unit | 1.20 |
| Import duty | depends on product code |
| Marketplace referral / payment fees | depends on channel |
| Fulfilment fee | depends on size and weight |
| Ad cost per sale | your estimate |
| Profit per unit | what's left |
A useful rule of thumb: if the margin is thin before advertising, the product rarely survives paid traffic. Our guide to Amazon FBA profit in the US, UK and Germany walks through each line.
5. Risk: what could sink the launch?
- Seasonality that leaves stock sitting for months.
- Falling prices in the history chart (a price war).
- Size, weight or fragility that raises fulfilment costs and returns.
- Certification and compliance, common for toys, electronics, cosmetics and anything touching food.
- Supplier risk: one supplier, no samples, unclear lead times.
6. Confirm with a small real-world test
Data shows that demand exists; a small test shows that your offer can capture some of it. Order samples, check quality, and run a short ad test with a waitlist or pre-order page before the main order (see 4 ad creatives to test before you buy inventory).
A go / no-go summary
Go when:
- two demand signals agree and the trend is flat or rising,
- competition leaves room (weak listings or clear complaints to fix),
- the margin survives realistic ad costs,
- no risk is a deal-breaker.
Otherwise, move to the next idea. Dropping a product early is a win.
Validate in minutes instead of days
Ecomtoro builds this validation for you: Amazon price and sales-rank history, search demand, competition scores, a profit calculation with fees, VAT and duty, and a list of anything it couldn't measure. Every number links to its source, so you decide with evidence, not hunches.
Frequently asked questions
What is the most important signal when validating a product?
Sales history over time, ideally confirmed by search demand. Today's sales rank or a viral video can mislead; a steady record over months is much stronger evidence.
How much margin should a product have before I launch it?
Enough to pay for advertising and still leave profit. Work out your break-even return on ad spend; if you would need unusually efficient ads just to break even, the product is risky.
Should I order samples before validating with data?
Validate with data first, because it is faster and free or cheap. Order samples for the one or two products that pass, to check quality before a larger order.
