FOR IMMEDIATE RELEASE
Leading Marketplaces Unite to Launch Cross-Listing Network and Unified Seller Dashboard, Projected to Boost Merchant Sell-Through 180%
New alliance enables 40,000+ active sellers to sync inventory, orders and analytics across eight major platforms from a single interface, cutting listing time 40% in early trials.
San Francisco, Calif. – November 22, 2025
A consortium of eight resale and e-commerce marketplaces—including eBay, Poshmark, Mercari, Depop, Etsy, Shopify, Whatnot and Starluv—today announced the formation of the Open Seller Grid (OSG), an industry-first partnership that will offer native cross-listing and a shared seller dashboard beginning December 9, 2025. The initiative, governed by a newly created standards body, allows merchants to create one listing and distribute it instantly across all member sites while managing inventory, pricing and performance metrics from a single login.
The move arrives as inflation-conscious consumers flock to second-hand goods, pushing U.S. re-commerce revenue to an estimated $89 billion in 2025, up 14% year-over-year according to a July 2025 report from Crosslist. Sellers who list on three or more marketplaces currently achieve a sell-through rate 180% higher than single-platform users, yet 61% of small merchants cite “time-consuming manual uploads” as the primary barrier to multi-channel expansion .
“Fragmentation has been the silent tax on marketplace entrepreneurs,” said Leila Norcross, CEO of Crosslist and newly elected chair of the OSG standards council. “By pooling our APIs we’re eliminating duplicate work, reducing overselling risk and giving sellers AI-driven pricing recommendations that update in real time. Our beta cohort of 2,100 merchants increased average monthly revenue 25% within 60 days while spending 40% less time listing.”
Under the agreement, participating marketplaces will adopt a common product-attribute schema and synchronize inventory changes in under 15 seconds. Sellers gain access to a cloud-based Unified Seller Dashboard that aggregates fees, shipping labels, buyer messages and analytics from every channel. The dashboard, built on AWS Marketplace infrastructure, also flags policy changes—such as Etsy’s recent title-formatting rule—so merchants can bulk-edit thousands of listings to avoid suspension or demotion in search results .
Early adopters are already reporting measurable gains. Vintage apparel store Vintage Vault WV piloted the OSG tools in September and saw items sold surge 372% in three weeks, while listing speed improved 10-fold. Meanwhile, part-time reseller Emily Testa leveraged the dashboard’s real-time analytics to pivot into 1990s sportswear, lifting monthly profit 25% without increasing ad spend.
The partnership is expected to intensify competition among listing-software providers. Third-party cross-listing apps such as Vendoo, SellerChamp and Reeva currently charge $29–$99 per month for comparable automation; the OSG will offer core cross-listing and analytics free through 2026, funded by a 0.75% interchange fee split among marketplaces on completed sales. Optional AI add-ons—including auto-generated descriptions, dynamic pricing and photo resizing—will be available for $9.99 per month, undercutting stand-alone tools by roughly 60% .
Market analysts view the alliance as a strategic counterweight to Amazon’s dominance. “When eight specialty platforms integrate this deeply, they create a distributed marketplace that rivals Amazon’s SKU count but with higher margins for sellers and fresher inventory for buyers,” said Caleb Jin, e-commerce analyst at eMarketer. Jin forecasts the OSG could capture an additional $12 billion in gross merchandise value by 2027, shaving two percentage points off Amazon’s U.S. third-party share.
Roll-out will proceed in phases. Starting December 9, sellers with accounts on two or more OSG platforms can opt into the unified dashboard via a one-click OAuth connection. Bulk-import tools will support CSV files as large as 50,000 SKUs, and automatic delist/relist functions will refresh listings every 24 hours to maintain search prominence. Full mobile functionality, including iOS and Android apps, is slated for Q1 2026.
About the Open Seller Grid
The Open Seller Grid is a cooperative standards body founded in 2025 by eight marketplaces to simplify multi-channel selling. Its mission is to lower operational friction, increase seller profitability and promote sustainable commerce through shared technology.
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