How to Validate a Merch by Amazon Niche with BSR (Before You Design Anything)

Most sellers waste hours designing for niches that were never going to sell. The fix is simple: validate demand with Best Sellers Rank (BSR) before you open your design tool. Here's the exact 5-minute workflow.

What BSR Actually Tells You

Every product on Amazon has a Best Sellers Rank inside its category. For Merch shirts (Clothing category), lower BSR = more recent sales. Rough translation:

| BSR (Clothing) | What it means | |---|---| | Under 100,000 | Selling daily — strong, proven demand | | 100,000 – 500,000 | Selling weekly — realistic target for new sellers | | 500,000 – 1,000,000 | Occasional sales — niche is alive but slow | | Over 1,000,000 | Rarely sells — likely dead weight |

You can see BSR on any product page under "Product information", or overlay it directly on search results with a free extension like iScale Labs.

The 5-Minute Validation Workflow

Step 1 — Search the niche the right way

Don't just type the keyword into Amazon. Use a filtered search that shows only Merch by Amazon listings (no FBA, no brands). MerchRadar's search tool builds this URL for you — it filters to Amazon-as-seller so you're only comparing against other Merch sellers.

Step 2 — Scan page 1 for BSR density

Look at the top 10–16 results:

3+ designs under BSR 100,000 → demand is real
Multiple designs between 100k–500k → healthy mid-tail, room to enter
Page 1 dominated by sub-50k BSR with thousands of reviews → demand is real but you'll need a genuinely different angle
Nothing under 1M → walk away

Step 3 — Check upload recency

Sort by newest arrivals. If recently uploaded designs are already getting sales (low BSR within weeks), the niche is growing — that's the best signal there is. If every seller on page 1 uploaded years ago, the niche may be coasting on old listings you can't displace.

Step 4 — Count the competition

Note the total result count. As a rule of thumb for a filtered Merch-only search:

Under 1,000 results with proven BSR → low competition, go
1,000 – 10,000 → normal; you need a better angle, not just another text tee
10,000+ → saturated; only enter with a strongly differentiated sub-niche

Step 5 — Cross-check other marketplaces

The same keyword behaves completely differently in the UK or Germany. A niche that's saturated on amazon.com is often wide open on amazon.de. MerchRadar lets you flip marketplaces with one click — check at least one non-US market before deciding.

Bonus: Try a Different Product Type

Competition is calculated per product type. "Dog mom" t-shirts may be saturated while "dog mom" sweatshirts or hoodies have a fraction of the competition with the same buyers. Always check the variant before abandoning a niche.

The Checklist (Copy This)

[ ] Filtered Merch-only search (not raw Amazon search)
[ ] 3+ designs under BSR 100k on page 1
[ ] Recent uploads are selling (sort by newest)
[ ] Result count under ~10,000
[ ] Checked at least one non-US marketplace
[ ] Checked hoodie/sweatshirt variant

If a niche passes 4 of 6, design for it. If it passes all 6, prioritize it this week.