Most marketplace founders fixate on supply. Build enough of it, the thinking goes, and demand will follow. What they underestimate is how much intentional work it takes to get the demand side moving, and how much damage is done when buyers arrive to a platform that has not figured out how to find them yet.
Your first 100 buyers in a cold-start marketplace are not a growth number. They are a proof-of-concept number. Get to 100 real, paying buyers and you have enough signal to know whether the flywheel can spin. Below that threshold, you are still discovering whether demand exists, what it looks like, and whether your supply meets it. Above it, you start optimizing.
Here is how to get there.
Why 100 Buyers Is the Right Target
Ten buyers tells you almost nothing. A purchase could be a favor, a curiosity, or a coincidence. One hundred buyers, spread across different acquisition channels and use cases, starts to reveal patterns: who is buying, why they came, what they searched for, whether they came back.
One thousand buyers feels like the wrong target because at that scale you should already have the early flywheel logic figured out. If you are still doing manual outreach to get to 1,000 buyers, something is wrong. At 100, manual outreach is exactly right.
The goal at 100 is not efficiency. It is learning. Every acquisition channel you test and every buyer conversation you have at this stage is cheaper than the equivalent insight you would buy later through failed campaigns and wasted budget.
The Cold-Start Demand Problem
Before picking a channel, understand the constraint: you are trying to acquire buyers for a platform they have never heard of, to use a service they currently get somewhere else.
This is why paid acquisition almost always fails at the cold-start stage. Not because it is the wrong channel, but because you do not yet know who your buyer is precisely enough to target them, and you do not yet know what message converts them. Running paid acquisition before you have those two things figured out is burning money to learn something you could learn for free through manual outreach.
There is a second problem that rarely gets named: your conversion funnel almost certainly has leaks you have not found yet. Paid acquisition does not just teach you who your buyer is. It runs expensive traffic into a funnel that has not been validated. When those buyers do not convert, you have spent budget to discover that something is broken, but you still have to figure out what. And the problem is rarely the checkout button or the layout. It is more often a positioning mismatch (the buyer arrived expecting something your supply does not deliver), a supply gap (the right buyer arrived but the right supplier was not there), or a trust deficit (the platform is too new to feel safe for a first transaction). Those are structural problems that paid spend cannot fix. Running a conversion audit before you open the paid channel is how you avoid paying to learn what manual acquisition would have shown you for free. Manual acquisition forces you into the conversion conversation directly, which means you learn faster and cheaper where the funnel breaks and why.
Seeding supply in a cold-start marketplace faces the same constraint on the supply side. The solution is the same: go manual first, extract the learning, then systematize.
Manual Channels: Where Your First Buyers Already Are
Your first buyers are not waiting for you. They are already somewhere, already solving the problem your marketplace solves, probably through a fragmented and inefficient process. Your job is to find them where they are.
Category-specific communities. Every market has online communities where buyers discuss the problem your marketplace solves. Slack groups, LinkedIn communities, Reddit forums, Facebook groups, niche forums. A commercial photography marketplace should be in communities where brand managers and creative directors talk about production. A B2B services marketplace should be in founder communities where the target buyers discuss finding and vetting service providers.
The approach is not advertising. It is participating, answering questions, and identifying the people who are actively trying to solve the problem you solve. Direct outreach to those individuals converts at rates that paid acquisition cannot match.
Direct outreach to identifiable buyers. In many verticals, you can identify specific buyers by name. Companies that buy the kind of service you sell. Job listings that reveal intent: a company posting for an in-house photographer is a company that buys photography. LinkedIn searches filtered by job title and company size. Event attendee lists. Conference speakers.
Build a list, reach out personally, and treat each conversation as a user research session, not a sales pitch. At this stage you want the booking and the insight.
Press and niche media. Niche trade publications, newsletters, and podcasts that reach your buyer segment often cover new platforms. A single feature in the right newsletter can deliver 50 qualified buyers faster than months of cold outreach.
Your Supply as a Demand Magnet
Suppliers have something you do not have yet: existing relationships with buyers. Before your marketplace has a brand or traffic, your supply side may already have a pipeline.
Identify which of your suppliers have their own clients and ask them to bring those clients through the platform. Give them an incentive to do it: easier admin, faster payment, protection, or simply a better experience than managing the relationship offline.
This is not a long-term acquisition strategy. It is a bootstrapping mechanism. The buyers who come through supplier relationships eventually become independent marketplace buyers if the platform experience earns their trust.
Partnerships With Buyer-Aggregators
Some organizations have already aggregated your target buyers. Trade associations, corporate procurement teams, buyer communities, agencies that serve your buyer segment. A partnership with one of these organizations can deliver buyer volume that would take months of individual outreach.
The key is to offer the partner a reason to introduce you. That reason must work at your current scale. Partnerships that require you to already have a large supplier base or guaranteed volume do not work in the cold-start phase. The value proposition has to work with what you have now.
The marketplace flywheel explains how supply quality drives demand trust. Partnerships leverage the supply quality you have built before you have the brand recognition to drive demand independently.
Content and SEO: The Long-Game Parallel
Manual acquisition gets you to 100 buyers. Content and SEO gets you to 1,000 without proportionally increasing headcount.
Start building content infrastructure in parallel with manual outreach, not after it. A buyer who finds your marketplace through a search for "how to hire a commercial photographer" is a more qualified, lower-cost acquisition than most paid channels.
The programmatic SEO playbook for marketplaces covers how to build the content and page infrastructure that generates organic demand at scale. At the cold-start stage, your goal is to begin, not to complete. Publish one comprehensive buyer guide in your category. Build the location and category page infrastructure. These assets compound over time.
The First Transaction Experience
Getting a buyer to your platform is not acquisition. Converting them into a transaction is. And retaining them for a second transaction is where the flywheel actually starts.
Before you scale any channel, make sure the first transaction experience is tight. A buyer who completes a booking and has a poor experience generates a refund request, a negative review, and a lost cohort. At the cold-start stage, each of those losses is costly because you have not yet built the volume to absorb them.
Focus on three things: the listing quality of the supply you are sending buyers to, the smoothness of the booking flow, and the post-booking communication. These account for most of the drop-off between first transaction and second transaction.
When You Have Crossed 100
The signal that you have crossed the threshold is not the number itself. It is what you see in the behavior of those 100 buyers.
Look for: at least some buyers who returned for a second transaction without prompting. At least some buyers who came from a channel you did not directly control. A search-to-booking conversion rate that is improving over time. Supply earnings that are predictable enough that suppliers are investing in the platform relationship.
If those signals are present, you are ready to start scaling acquisition spend. If they are not, adding more buyers to the top of the funnel will not fix what is broken at the bottom.
For marketplace founders building an organic demand channel alongside manual acquisition, the Growth and SEO service covers buyer acquisition strategy, content infrastructure, and channel mix from cold-start through $15M GMV.