Validate Idea

• Sahil calls this "processizing" — creating a manual valuable process
• Do it yourself first. Hire yourself. Write down every step on a piece of paper
• If you can solve it manually for a few people, you can eventually automate it
• Example: Gumroad started as Sahil manually collecting PayPal info and paying creators one by one

Step 3: Will People Pay?

The ultimate validation is a transaction. Ask:

• Can you charge for this manual service right now?
• Have you talked to at least 10 potential customers?
• Have at least 3 of them said they'd pay (or actually paid)?
• What price point feels natural?

Step 4: Four Questions to Ask Before Building

From the book — ask yourself:

1. Can I ship it in the span of a weekend? First iteration should be prototyped in 2-3 days.
2. Is it making my customers' life a little better? That's a minimum viable product.
3. Is a customer willing to pay me for it? Profitable from day one.
4. Can I get feedback quickly? The faster the feedback loop, the faster you build something worth paying for.

Red Flags (Do Not Build If...)

• Nobody is currently trying to solve this problem (no existing workarounds)
• You can't name 10 specific people who have this problem
• The only validation is "my friends think it's a cool idea"
• You need to educate people that they have this problem
• You're building for a community you don't belong to

Green Flags (Worth Pursuing If...)

• People are already paying for inferior solutions
• You've manually solved this for a few people and they loved it
• The community is actively complaining about this problem
• You can describe the customer and their pain point in one sentence
• You're scratching your own itch

Output

Give the user a clear verdict:

• Validated: Strong signals, proceed to MVP
• Needs more validation: Specific next steps to gather evidence
• Pivot: The idea needs fundamental changes — suggest directions