SaaS Growth Vault
Playbook·Evidence → Revenue

The 30-Day Demand Test

Prove someone will pay before you build the rest.

STATUS
IN USE
SOURCE
MENTORING
UPDATED
22 JUL 2026
EVIDENCE
Radwan's rule for turning interest into a first sale.
5 min read

The problem

People say they want it. Almost no one has paid. You keep building, hoping the product will do the selling for you. It will not.

Why founders get it wrong

Interest is free to give. A price is where you find out what is real.

The decision rule

The decision rule

In the next 30 days, get one real buyer to pay for the smallest useful version — even if you deliver it by hand.

The plan

  1. Write the smallest offer someone would pay for now.
  2. Put a real price on it.
  3. Sell it to warm buyers before building anything new.
  4. Deliver manually where that is faster than code.
  5. Turn what the buyer values most into your next product decision.

Do this today

Do this today

Write your first paid offer in three sentences and send it to one warm buyer.

What good looks like

Money changes hands. You learn what the buyer actually values, which is usually narrower than what you planned to build.

Failure mode

You keep "almost ready" for weeks. If you cannot sell a manual version, more features will not fix it.

Evidence and limits

Counterexample

Some regulated or infrastructure products genuinely cannot be delivered by hand. There, sell a paid pilot or a signed letter of intent instead of a live product.

Next page

Check your proof with the Idea Evidence Score.

Evidence and limits

A practical heuristic, not a guarantee.