How do I know people will pay before I build it?

Farzad KhosraviHans BunesDenis BalitskiyTobias Boecker Maciej GalkiewiczSaachi PoleRomanSean WeisbrotVas DaskalakisLia ParkhurstPablo Asensio

11 answers from 11 mentors. Each one was said to a founder on a call.

Updated 8 October 2026

It depends on where you are

Every answer here was said to one founder. Find the one closest to you, then read what that founder was told.

You are still in a job

Test the idea before you quit: line up clients from your network or talk to many companies.

Tobias Boecker,Sean Weisbrot

Your wait list sounds excited

A wait list and kind words prove little, so ask for money or hold honest calls with a few champions.

Pablo Asensio,Farzad Khosravi

You know your buyers from past work

Use that access, but list the costly problems and set up talks where people can be honest with you.

Denis Balitskiy,Hans Bunes

You are unsure whether to build or research first

Pitch it or run interviews first. One mentor says build a tiny version and ask there.

Roman, Maciej Galkiewicz,Vas Daskalakis

Tell us about your case

Answer a few questions, then meet your mentor matches.

Ask them to pay

A price, a pitch or a letter of intent

Said to a founder who built before checking people would pay

True validation comes from commitment, money, time, effort

Everyone will say they'll try your app, everyone will join a wait list, everyone will do something for free. They'll all say nice things.

View profile

Said to an agency owner weighing a switch to a product

Find the big fat problem that's costing them money

You have an insane advantage most people don't have. You have access to people with relationships and an inside view of their problems. It's easy to develop. It's hard to develop the right thing.

View profile

Said to a founder still in a job, testing a business idea

Test the waters while still having the job

I believe if you have one or two people who say yes, we're with you, I don't think anything holds you back.

View profile

Said to a coach starting a product from scratch

You 100% should test it before building everything out

Maybe you send it to your existing community. Maybe you also run some ads to get a sense of a colder audience. Let's say you run ads for like $200, $300. See how many people buy at $10, how many at $30.

View profile

Said to a founder unsure whether anyone needs what they're building

Start pitching as soon as possible

A CEO I worked with sold his product to 50 companies before building it. He had a presentation, an app design and nothing else. He's crazy, I would never do that, because it takes sales skill.

View profile

Talk to buyers first

Honest talks that filter out polite yeses

Said to someone with manufacturing experience testing ideas for an offer

Talk to people you trust, but interview them

Salespeople tend to be very optimistically biased sometimes. They have happy ears and happy feet. What we're really trying to do is, in an unbiased way, validate our assumptions or hypothesis.

View profile

Said to a technical founder unsure what product to build

By the book, you start with interviews

I run a software agency and I've seen people burn through hundreds of thousands of euros where they could do better research.

View profile

Said to an employee hoping to test an idea at their company

Try to talk to 50 to 100 companies

The question you have to answer for yourself is: are there other companies that also have this problem? If the answer is yes, you may have a business. If the answer is no, you will be stuck building for your own company that you're an employee of.

View profile

Said to a founder building a platform before talking to customers

You don't always need to build before getting customers

It's really common for folks to feel like they have to build something before they get customers. That's not always true. There's a fine line. A large healthcare organization doesn't want to be your guinea pig, and I'm not saying pitch the thing and then go build it. A lot of times it's not a thing you have to build to solve the pain.

View profile

Said to a pre-launch founder whose wait list sounds excited

You really have to validate the validation

Out of your wait list, identify your champions: people who will not only pay, but also help you build it. Usually it's a bunch of 7 or 8, maximum 10 people. They would happily jump into a 30-minute call with you, and what you want is to calibrate how interested people really are.

View profile

Build a tiny version

Let real use be the research

Said to a founder who paused building to run a market survey

Build the simplest MVP, user feedback is your research

Speaking generally, the only research you're allowed to do when you're starting a startup is conversations with customers, when they're working with what you've created.

View profile

What would a mentor tell you?

Each answer here fits one founder. Tell us where you are.

Answer a few questions, then meet your mentor matches.

How this page is made

These answers come from real conversations between founders and GrowthMentor mentors, edited for clarity and with personal details removed. Mentors can update or remove their answers at any time.