Find the cheque before designing the invoice
Existing competitors are good news
A market in which several other practices are already being paid for a comparable offering is a market in which the buyer recognises the category. The presence of competitors is usually a sign that demand is real and that the buyer's mental budget already has a slot for this kind of cheque. A market with no competitors at all should raise more concern than one with several.
Three quick demand-validation checks
Before designing anything, run three checks. First, search advertising libraries for current adverts that target your intended buyer with a comparable promise. Second, look at reviews of competing service practices to see what their existing clients describe paying for. Third, speak to two or three potential buyers and ask what they currently pay for in this category. The cost of these checks is hours, not weeks.
Distinguish 'interesting' from 'paid for'
Buyers will often agree that an idea sounds interesting in conversation. That is not validation. The signal you need is evidence of actual cheques being written by similar buyers for similar work. Verbal agreement is cheap; spending behaviour is honest. When the two contradict, trust the spending behaviour.
How to tell when validation is genuinely missing
Useful warning signs: nobody else is offering anything comparable, the promised buyers cannot name a current supplier of anything similar, ad libraries are empty for the category, and review platforms show no businesses being paid for the kind of work you plan. Each of these on its own is weak evidence. Together they are loud.
Real-world parallel — Buffer's two-page launch (2010)
Joel Gascoigne built a two-page website before writing any product code. The first page described the product idea — a tool to schedule social-media posts — and invited visitors to sign up for launch notifications. When that signal proved positive, he added a pricing page between the landing page and the email form, asking visitors to choose a plan before submitting their email. Clicks on the pricing page validated not just interest but willingness to pay. After Buffer eventually shipped working code, the first paying customer arrived three days later. Gascoigne wrote up the process in a 2011 post that has since been cited as the canonical pre-validation case study. The lesson generalises across categories: build the pricing page before the product, and trust spending behaviour over verbal enthusiasm.
Pick a service idea you have considered. Without doing any new work, can you point to three other operators currently being paid by the same kind of buyer for something similar? If not, what does that absence tell you?