Practical Way to Measure Product-Market Fit when Traditional Metrics Fail

Product-market fit is one of the most important milestones in the life of any startup. And one of the hardest to measure.

Founders obsess over ARR, churn, retention, activation, and usage. But none of these growth metrics mean anything if you’re too early in your journey.

• Pre-product? You have no retention.
• Pre-revenue? You have no ARR.
• Pre-scale? Even positive signals can mislead you.

As a CTO and cofounder, I’ve seen firsthand how dangerous early KPIs can be.

Engineers love measurable indicators. Founders love momentum. And dashboards love to make small numbers look important.

But early on, traditional SaaS metrics don’t tell you if customers want what you’re building. They only tell you when something’s moving. Not if it matters.

So how do you know if you’re getting closer or drifting away from product-market fit?

After years of building AXDRAFT and AiSDR, my answer has less to do with revenue dashboards and more to do with this fundamental question:

What currency are your customers paying you with?

Which currency are your customers paying you with?

Before customers ever pay you with money, they pay you through signals that reveal more about whether PMF is approaching.

Here’s the “currency” progression:

Attention → Time → Reputation → Commitment → Money

As a CTO, I think about these currencies in the same way I think about product friction: Each step requires a higher willingness to invest time and energy into your product.

Attention is easy to give away. But money is not.

Your job is to get customers to willingly move up this ladder.

Stage 1: Problem Existence

“Is there a problem?”

Currency: Time | Reputation

If you can’t get attention or time – even for free – you don’t have a problem. 

You have an idea.

This is where many teams accidentally over-engineer. They build solutions for problems they think exist instead of validating whether the problem matters at all.

Signals to look for:

• People agree to speak with you
• You consistently find people who experience the problem
• Those people refer you to others with the same problem
• Prospects willingly schedule follow-up calls

Stage 2: Problem Urgency

“Are customers willing to take action that solves the problem?”

Currency: Time | Commitment

Urgency is where priorities get exposed. Urgency is the difference between “Yeah, interesting idea” and “I need this yesterday.”

If someone thinks your solution is interesting but not urgent, you’re a nice-to-have. If they reorganize their week to test your prototype, you’re a painkiller.

Urgency is the clearest sign you’re solving a real problem and heading towards solid PMF. 

Signals to look for:

• Customers are active in free pilots
• Customers commit to a prototype or MVP
• Prospects pay for a discounted pilot
• People are eager to test early versions

Stage 3: Problem–Solution Fit

“Does your solution solve the problem?”

Currency: Time | Reputation

This is the earliest point where product feedback becomes meaningful. But many teams misread feedback.

Compliments mean nothing because you need to look for behavior. Not praise.

If your solution works, usage becomes self-sustaining. If customers are unhappy or say it works yet don’t use it, you don’t have fit.

Signals to look for:

• Customers are happy with your free pilot
• Customers are happy with your discounted pilot
• They use your product without constant handholding

Stage 4: Business-Model Fit

“Can you make a profit?”

Currency: Money

This is the first time real revenue becomes a meaningful signal.

Customers are no longer paying with “experimental curiosity”. They’re paying for a specific outcome.

This is also where system mistakes start showing up

Scale tests your product design, reliability, and shortcuts you took earlier (and whether or not you regret them).

Signals to look for:

• Paid pilot customers are happy
• Paid pilots renew
• Customers actively use the product
• Early revenue is profitable or trending toward profitability

Stage 5: Product-Market Fit

“Can you scale it?”

Currency: Money | Reputation

You know you’re close when growth starts happening to you, not just because of you.

This is where the product evolves from a guided experiment into a revenue engine.

Signals to look for:

• High retention
• Strong word-of-mouth
• Repeatable sales process
• Customers who expand usage
• 5-star reviews and high NPS
• Happy customers at scale

How to use this framework

This is one of the simplest PMF tests I know.

Ask yourself: 

“Which currency did we earn 4–8 weeks ago? Which currency are we earning now?”

If you’re moving upward/right → You’re progressing.
If you’re stuck at the same stage for 6 weeks → Change something fast.

This is the difference between progress and illusion.

Vanity signals like website visits, waitlists, pitch wins, and media mentions are comforting but meaningless if they’re not adding to revenue.

I would take 10 happy paid pilots over 1,000 waitlist signups every single time.

Real validation comes from behavior. Not attention. 

Why Most Early-Stage KPIs Mislead You

Here’s the truth:

• MRR is useless without retention
• Retention is useless without real product usage
• Activation is useless when the product barely exists
• Traffic is useless when no one converts

Early PMF isn’t a numbers game. It’s a signal game.

The closer the customer gets to paying with money, the closer you are to PMF.