DuoGain Buy & Sell Marketplace

DuoGain’s first public release, woohoo!

Join early to earn the OG Seller badge and start selling nationwide with no fees.

DuoGain is a new fast-growing marketplace app for buying, selling, and discovering collectibles, electronics, fashion, vintage goods, and everything in between.

Looking for a smarter way to buy and sell online?
DuoGain is your go-to, all-in-one marketplace built for buyers and sellers whether you're decluttering, side hustling, or treasure hunting.

Why DuoGain?

For sellers

- Free to List & Sell (for Casual Sellers)
List your items with no upfront fees and no DuoGain fees when your item sells, perfect for casual sellers.

- Sell in Seconds
Snap a photo, set your price, and list in just a few taps.

- Instant PayPal Payouts
Make money with DuoGain! Get paid instantly after each sale, straight to your PayPal.

- Simple 3-Step Selling
List → Get Paid → Ship. That’s it.

- Nationwide Reach
List once and reach buyers in all 50 U.S. states.

- Upgrade When You're Ready
Power seller? Upgrade your account for free for more listings, free listing promotions, and lower fees: just 3.49% + $0.49 per completed sale, still with no upfront cost.

For Buyers

- Buy with Confidence
Enjoy buyer protection, PayPal-backed payments, and an easy dispute process directly on the app if things go wrong.

- No Hidden Fees
You only pay for the item. No additional fees for secure transactions.

EXPLORE A WORLD OF POPULAR BRANDS
Top Picks in Apparel & Footwear
- Shop must-haves from H&M, Zara, Aritzia, and Free People
- Sneakers and streetwear from Nike, New Balance, Converse, and Reebok

Gadgets, Gear & Tech Deals
- Apple, Samsung, and Google Pixel phones
- Tablets, earbuds, and smartwatches
- Gaming gear from Nintendo, Xbox, and PlayStation

Niche Finds & Fandom Favorites
- Funko Pops, Banpresto figures, and My Hero Academia merch
- LEGO sets, Beyblades, and Pokémon plushies
- Hello Kitty, Sanrio, and BT21 collectibles
- Twice, BTS, Stray Kids, NCT, Seventeen, and Blackpink albums and photocards

Vintage & Pre-Owned Electronics
- Retro consoles like Game Boy, PSP, and Wii
- Laptops, cameras, lenses, and accessories
- Home audio and instruments from Yamaha, Roland, and Casio

Kids’ Clothing & Toys
- Brands like Carter’s, Hanna Andersson, and Burt’s Bees Baby
- Toys from Melissa & Doug, VTech, and LeapFrog
Affordable Designer Picks
- Shop secondhand pieces from Coach, Michael Kors, and Kate Spade
- Explore unique finds from Tory Burch, Marc Jacobs, and Fossil

Key Features
- No listing or selling fees for all casual sellers.
- User-Friendly Interface: List and browse items effortlessly.
- Secure PayPal payments
- Nationwide Reach
- Available to U.S. users (18+)
- Growing fast! We're just getting started!

Ready to Buy or Sell?

Join DuoGain and start using the marketplace app built for everyday people, whether you're selling a rare trading card, a retro game, shoes, shirts, or clearing out old tech. It’s free to list, easy to use, and designed to help you keep more of what you earn.

Download now and claim your OG Seller badge.
Your marketplace, your profits.