Shopify's native marketplace integrations assume every unit of a stock keeping unit (SKU) is identical. Secondhand inventory isn't. Here's where that breaks down, and how Oly handles it instead.
Shopify Marketplace Connect, formerly Codisto, is Shopify's own native app for syncing a Shopify product catalog to external marketplaces. It connects Shopify stores to Amazon, Target Plus, Walmart, and eBay, syncing listings, orders, and inventory directly from the Shopify admin. Pricing is free with any Shopify plan for up to 50 orders per month, after which a 1% transaction fee applies, capped at $99/month. New connections to Etsy are no longer available through the app, though existing Etsy connections continue to work.
Marketplace Connect is built around Shopify's standard product and variant model: a catalog of SKUs, each with a tracked quantity, mapped to the equivalent fields each marketplace expects (brand, category, identifiers like UPC or ASIN). That model fits new, mass-produced retail goods well, since a SKU represents many identical units: 12 of the same t-shirt in size M is "1 SKU, quantity 12," and any one of the 12 is interchangeable with any other. It wasn't built with secondhand or one-of-a-kind inventory in mind, where two items of the same model, say a pair of vintage Chanel bags, can have different wear, different photos, and different prices, with no real depth of stock to track since each is effectively its own one-of-one SKU. None of Shopify Connect's supported marketplaces (Amazon, Target Plus, Walmart, eBay) are resale-specific platforms either.
A factual comparison based on Shopify's own help documentation and app listing, current as of 2026.
| Feature | Oly | Shopify Connect |
|---|---|---|
| Built for | Secondhand and luxury resale, one-of-a-kind inventory | New, mass-produced retail goods with repeatable SKUs |
| Inventory model | Each item treated as unique, no false "depth of stock" | Shared quantity field per SKU, assumes interchangeable units |
| Marketplaces supported | 13 marketplaces: Vestiaire Collective, Grailed, eBay, Vinted, Depop, Joli Closet, The Vintage Bar & Miinto, Shopify, Poshmark, Mercari, Whatnot, TikTok Shop, and ThredUp | Amazon, Target Plus (US only), Walmart (US only), eBay; no new Etsy connections |
| API connection with luxury resale marketplaces | Vestiaire Collective, Joli Closet, Rebelle, The Vintage Bar | None listed; no secondhand or luxury resale marketplace in its supported list |
| Condition and authentication fields | Built-in support for condition, brand taxonomy, and luxury market requirements | Maps standard retail fields (brand, category, UPC/ASIN); no condition-specific data model |
| ERP/backoffice flexibility | Native to Shopify, other ERPs supported via custom connector, just contact us | Shopify-only by design, it's a native Shopify app |
| Automatic price decreases | Set a floor price and Oly automatically lowers prices over time while protecting your margin | No automated floor-price feature; pricing syncs as set in Shopify |
| Pricing model | Contact for pricing | Free up to 50 orders/mo, then 1% per order up to $99/mo |
Shopify Marketplace Connect pricing and feature details sourced from Shopify's Help Center and App Store listing as published in 2026. Shopify and Shopify Marketplace Connect are trademarks of Shopify Inc. Oly is not affiliated with or endorsed by Shopify.
No tool is the right fit for everyone. Shopify Connect has real strengths worth acknowledging.
Shopify Connect inherits Shopify's own assumption that a product is a repeatable thing you can restock. That's the right assumption for a brand manufacturing the same item over and over. It's the wrong assumption for a reseller, where the next item that comes in the door is never quite the same as the last one, even if it shares a brand and category. In practice, that mismatch shows up as sync errors, mislabeled "in stock" items that are actually unique pieces, and listings that don't carry the condition-specific detail luxury and vintage buyers expect to see.
Oly treats every piece of inventory as its own item from the start, with the condition, photos, and pricing that come with secondhand and luxury goods specifically. It connects outward to the marketplaces actually built for resale, including Vestiaire Collective, Grailed, Joli Closet, Rebelle, and The Vintage Bar, none of which appear in Shopify Connect's own supported list. Pricing adjusts itself toward a floor you set, and a sale anywhere becomes an order in your back-office automatically, ready for fulfillment without anyone chasing it down.
Already using Shopify Connect for Amazon, Walmart, or eBay? Oly runs alongside it for the marketplaces actually built for resale.
See how Oly handles one-of-a-kind inventory across every resale marketplace that matters.
