Every working business leaves a trail. Learn to read it and you can tell, before committing a single week, whether a market is real — and roughly how big the opportunity is. This is the research skill that turns “I have a hunch” into “I have evidence.”
The signal hierarchy
Verified revenue (the strongest)
Public MRR or ARR is the clearest proof demand converts to money. A company openly doing $20K/month has answered the two hardest questions — do people want this, and will they pay — for you. Treat verified revenue as the anchor signal and build outward from it.
Traffic & search
Rising organic traffic and growing search volume mean people are actively looking for a solution. Flat or declining search can mean a shrinking market — or one so new the language hasn't formed yet. Context matters.
Reviews & ratings
Volume of reviews signals customer base size; the content of the negative ones signals unmet needs. A product with thousands of reviews and a recurring complaint is a validated market with a visible wedge.
Hiring & investment
Job postings and funding rounds show where companies are betting. A team hiring for a specific product line is telling you that line is working.
Community activity
Active forums, Slacks, and subreddits around a problem mean a reachable, engaged audience — which is often worth more than raw market size.
Triangulate, don't trust one number
Any single signal can mislead. Traffic can be vanity; a review count can be gamed; one founder's revenue claim can be aspirational. Confidence comes from convergence: revenue and traffic and active community and complaint patterns all pointing the same way. When several independent signals agree, you're looking at a real market.
From signal to decision
Signals tell you a market works. They don't tell you how you win it — that's the wedge (covered in reverse-engineering). Use signals to shortlist markets worth entering, then do the teardown to find your angle. The pairing — proven demand plus a sharp wedge — is what separates a bet from a gamble.
A quick reading routine
- Anchor on verified revenue where you can find it.
- Check search/traffic trend for direction.
- Mine reviews for unmet needs and wedge ideas.
- Confirm a reachable community exists.
- Only then, score the opportunity and shortlist it.
Do this consistently and you'll develop pattern recognition — the founder's real edge — for spotting markets that pay before everyone else notices.