You're running a marketplace, a staffing platform, a freelance network, or some other two-sided business where you need both suppliers and customers to make the whole thing work.
Cold email seems like a no-brainer for growth. But then you hit the wall - and it's a specific wall that most cold email advice completely ignores.
How do you pitch a marketplace to someone when half your value prop depends on having the other side of the platform already built out?
The Two-Sided Platform Problem
Let's say you're running a freelance talent marketplace. You want to sign agencies as clients. But agencies will ask - "How many developers do you have? What's the quality like? What can they actually deliver?"
Your honest answer at first is: "We're just getting started."
That's a losing position. No one wants to be your experiment.
Same problem if you're on the other side. You're a staffing platform trying to recruit contractors. They want to know - "How many actual jobs are coming through this platform monthly? What's the pay like? Are there enough opportunities?"
Again, you're asking people to bet on a promise rather than a reality.
This is why most two-sided platforms fail at cold email. The value proposition falls apart without evidence on both sides of the marketplace.
You Have to Pick a Side First
Here's what actually works - you don't build both sides simultaneously through outreach. That's a waste of time.
You pick one side. You go all in. You build real supply or real demand - not with cold email, but with whatever it takes.
Some platforms do this with manual work. Some bootstrap it with a small group of early users. Some partner with existing platforms to import initial supply. The method doesn't matter. What matters is you get real.
Once you have genuine supply or demand, cold email becomes useful for the other side.
Let's use concrete examples:
Scenario 1: You're Starting a Designer Marketplace
Build your designer side first. Recruit 30-50 actual designers into your platform. Get them set up. Make sure they're active. This might take months of manual recruiting, referrals, or partnerships - but do it.
Then cold email agencies. Your pitch isn't a promise - it's a reality. "We have 47 vetted designers ready to work. Here's our current project turnaround time. Here's what they cost." Now there's something to evaluate.
Scenario 2: You're Building a Gig Work Platform
Reverse it. Find companies or individuals who have real work to post. Get genuine job volume on your platform first. When you have 20-30 active jobs, then recruit workers. Workers want to see opportunities. Give them that.
What Your Cold Email Should Actually Say
Once you've built one side, your cold email becomes straightforward because you have real leverage.
Here's what works:
- Lead with your strongest stat on the supply side. "We've onboarded 67 vetted B2B copywriters. Average turnaround on projects is 4 days." This isn't a promise - it's current reality.
- Be specific about who benefits. "For agencies like yours that need copywriting capacity without hiring full-time, this works well." You're showing you understand their actual problem.
- Show proof it works. Even if it's early, show one success story. One company that posted a job and got filled. One worker that got consistent work. Something real.
- Tell them what to expect. "Typical onboarding takes 24 hours. You'll start seeing qualified candidates within a week." Remove mystery and objections up front.
- Make the barrier to entry low. Don't ask for commitment. Ask for a single small test. "Post one job for free and see who applies."
The Sequencing Matters More Than the Copy
Here's the thing most founders get wrong about cold email for two-sided platforms - they think the copy is the problem.
It's not. The problem is the sequencing of when you try to build each side.
If you cold email both sides at the same time when you have zero traction, your response rate will be terrible no matter how good your copywriting is. Because your value proposition is incomplete.
But if you cold email one side after you've already built the other, suddenly things work. The copy doesn't need to be fancy. It just needs to be honest about what you have.
What to Actually Expect
Even with real supply or demand on one side, two-sided platform cold email is slower than single-sided cold email.
People are naturally skeptical of marketplaces. They want to know if the other side is real, if there's enough volume, if it's worth their time to integrate something new.
Your response rates will probably be 3-5% instead of the 5-8% you might see with a traditional service offer.
But the deals that do convert tend to be bigger because you're signing companies to a platform, not a one-off service.
The key is patience and realistic expectations about your timeline.
When You Should Hire Help
If you're good at building supply or demand manually, stay focused on that. Don't split your attention with cold email campaigns.
Cold email is something you can handle yourself at the beginning - the volume isn't high enough to require a specialist.
But there are a few reasons to bring in help:
- You've built one solid side of your marketplace and want to scale the other side quickly - that's when cold email campaigns can move the needle.
- You don't have infrastructure set up yet (email warmup, deliverability, list sourcing, reply handling) and you don't want to figure it out.
- You want someone managing campaigns while you focus 100% on product and the supply side.
If you're running a two-sided platform and have built real traction on one side, companies like BEC Growth handle the whole cold email side - they set up infrastructure, find the right prospects, write the copy, run the campaigns, and handle responses. You focus on your marketplace, they focus on bringing in users for the other side.
It's not the answer for everyone. But if you've proved one side works and just need to scale the other efficiently, it saves you months of setup and learning.