I've spent the last two years building Nerdbase - a platform that powers specialized marketplaces for collectors. Nerdworth for art slabs. Sugrworth for PEZ dispensers. More verticals coming.
But the more I talked to collectors, the more I realized we were solving the wrong problem.
The Real Friction Isn't Listing
Most marketplace builders (myself included) obsess over catalog features, listing flows, and checkout optimization.
But that's not what keeps buyers up at night.
The friction is trust.
When you find a rare PEZ dispenser on Instagram for $500, the question isn't "how do I list this on a marketplace?" The question is "can I trust this seller?"
And for sellers? "How do I prove I'm legit when I'm messaging someone for the first time?"
Reputation Doesn't Travel
Here's what I kept hearing:
- "I've got 800+ eBay feedback but I do most of my deals in DMs now" - "I'm afraid to buy from anyone without seeing their rep first" - "I wish my marketplace reputation showed up on Instagram"
The pattern was clear: collectors are omnichannel, but reputation isn't.
You might have:
- Years of eBay history (500+ feedback) - Dozens of Instagram DM deals - Multiple marketplace accounts - In-person show sales - Facebook group transactions
But none of it connects. Every new platform means starting from zero.
The Insight: Reputation Should Be Portable
What if you had one reputation profile that worked everywhere?
Not a profile on Marketplace X or Platform Y. A universal trust passport.
- One handle: `repcheck.me/yourusername` - One trust score - All your deals, verified or not, in one place - Shareable anywhere: DMs, shows, email, social media
That's Repcheck.
How It Works
1. Import Your History
Don't start from zero. Connect your eBay account and import your feedback. If you've built trust over years, that should count.
2. Earn Verified Reviews
When you buy or sell on Nerdbase marketplaces (Nerdworth, Sugrworth, etc.), those transactions become verified-deal feedback. The highest trust signal.
3. Accept Reviews from Anywhere
Someone bought from you on Instagram? Send them your Repcheck link. They can leave a review (with or without logging in).
Guest reviews carry less weight than verified deals, but they still count.
4. Share Your Rep
Your profile lives at `repcheck.me/yourusername`:
- Link in bio - QR code at shows - Email signature - DM conversations
One link. Universal trust.
Why This Can Be Big
1. Collecting is fragmenting
Every category is spinning up specialized platforms and communities. Art slabs, TCG, sports, yo-yos, toys - all getting their own dedicated spaces.
That's good! Collectors deserve purpose-built tools.
But fragmentation creates trust friction. Repcheck is the connective tissue.
2. Reputation compounds
As we add more Nerdbase verticals (and integrate with external platforms), your Repcheck profile becomes more valuable.
One reputation profile. Works on every marketplace we launch.
3. This isn't just reviews
The long-term vision:
- eBay import (already planned) - Cross-platform verification (TCGPlayer, Whatnot, etc.) - Payment handling (take payments directly through Repcheck) - Dispute resolution (neutral third party with context) - API for marketplaces (any platform can query reputation)
Repcheck becomes the trust layer for the entire collecting economy.
What I've Learned Building This
Lesson 1: Trust Is the Moat
Most marketplaces try to build moats with catalog features or network effects.
But the real moat is trust portability. If your reputation is locked in one platform, you're trapped.
Repcheck makes reputation portable. That's valuable.
Lesson 2: Start Simple
The MVP is incredibly focused:
- ✅ Public profiles - ✅ Review system - ✅ Trust score (0-10) - ✅ Shareable links
No eBay import yet. No payment handling. No complex verification flows.
Ship the core. Add features based on real usage.
Lesson 3: Build in Public
I'm writing this before Repcheck is fully live. Why?
Because building in public creates accountability. It surfaces feedback early. And it helps potential users understand the vision.
If you're building something, tell people.
Try It
Repcheck is launching soon at repcheck.me.
Join the waitlist if you want early access.
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Why Now?
Three things made this possible:
1. Nerdbase gives us distribution
Every Nerdworth, Sugrworth, and future vertical user gets a Repcheck profile by default. Instant network.
2. Collectors are ready
The pain is real. I've heard it from dozens of collectors. The market is ready for this.
3. The tech is simple
This isn't a hard technical problem. It's a coordination problem. And we're in a unique position to solve it because we already have the marketplaces.
What's Next
I'm shipping the MVP in the next few weeks. Then:
- 🔜 eBay import (Q1 2026) - 🔜 Verified-deal integration with Nerdworth - 🔜 Magic link review requests - 🔜 Trust history charts
The goal: make Repcheck the default way collectors prove trust.
If you're in the collecting world - whether you're buying, selling, or just watching - I'd love your feedback.
Reach out: ricky@nerdbeak.com
Or follow along:
Let's build this.
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Ricky Eckhardt is the founder of Nerdbase, the platform powering Nerdworth, Sugrworth, and Repcheck. Previously: GoCamp (acquired), Fitted Retail, BookOutdoors (Hipcamp).