Crosslist from WooCommerce to Whatnot — FLUF’s WordPress Plugin for Multi-Marketplace Selling

If your WooCommerce store sells collectibles, trading cards, sneakers, streetwear, vintage clothing, Funko Pops, comics, jewellery, or sports memorabilia, you should be on Whatnot. Whatnot crossed $8 billion in GMV in 2025 — double its 2024 figure — and raised a $225 million Series F at an $11.5 billion valuation, making it the largest live-shopping platform in the West. The buyer base behaves nothing like a traditional marketplace: shoppers spend roughly 95 minutes per day in the app globally (around 65 minutes per day in Europe), tuning in to live shows the way they would tune into Twitch. A WordPress store with a curated collectibles or fashion catalogue is exactly the kind of inventory those buyers convert on.

Manually managing Whatnot listings alongside a WooCommerce catalogue is painful. Whatnot was built mobile-first around live streams; the off-stream Marketplace listing flow asks you to pick a category from a deep base64-encoded tree, fill structured attributes per category, attach photos one at a time, set a shipping profile, and re-enter every title, description and price by hand. For a dozen collectibles, that is fine. For a WordPress store with even a hundred SKUs the manual path is a part-time job. The FLUF Connect plugin removes the per-item friction: select WooCommerce products in wp-admin, click crosslist, and they appear in your Whatnot shop as Buy It Now listings ready to sell — either off-stream in the Marketplace tab or alongside whatever live show you schedule next.

Why WooCommerce Store Owners Should Be on Whatnot

WooCommerce gives you a branded direct channel; Whatnot gives you access to a buyer base that nothing in the WordPress universe reaches. The two together cover distinct audience segments without changing your operational stack.

Your WordPress store keeps the brand and the margin

WooCommerce gives you complete control: your domain, your design, your customer email list, your full margin on every direct sale. Repeat buyers come back to you, not to a platform’s algorithm. The trade-off is that WordPress traffic does not appear on its own — you spend on SEO, content, social, or ads to bring buyers in, and conversion from cold traffic is slow.

Whatnot brings community buyers WordPress will never reach

Whatnot reports more than 6.4 million sports cards sold per month, roughly two cards sold every second, and over 12 million orders per month in women’s fashion. Sellers ran more than 175,000 hours of live content per week in 2025. None of those buyers find you through Google or your WordPress blog — they discover sellers inside Whatnot, follow their shop, and return on a weekly cadence. By pushing your catalogue to Whatnot you tap an audience that buys on entertainment value and community, not search intent.

An 8% commission undercuts eBay and Depop

Whatnot’s US commission is 8% of the final sale price plus 2.9% + $0.30 payment processing; UK sellers pay 6.67% + VAT commission plus 2.42% + VAT processing plus £0.25 + VAT per order. The all-in take rate lands at roughly 12% — meaningfully lighter than eBay‘s 13–14% final value fees and below Depop‘s 10% seller commission once you factor in processing. For high-velocity categories like trading cards, sneakers and comics, the per-sale margin lift is enough to make Whatnot a serious channel even before factoring in the discovery boost.

The two together compound

Most WooCommerce stores that add Whatnot report a flywheel effect: Whatnot buyers discover the brand on a live show, follow the seller, and eventually click through to the WordPress store for higher-value items at full margin. Whatnot is the discovery and community-building surface; your WordPress store is where the long-tail customer relationship lives.

How the FLUF Connect Plugin Syncs WooCommerce and Whatnot

The FLUF Connect plugin for WooCommerce is the WordPress plugin for crosslisting WooCommerce inventory to Whatnot and other resale marketplaces. Setup is roughly ten minutes.

Step 1: Install the FLUF Connect plugin in wp-admin

From your WordPress dashboard go to Plugins → Add New → search “FLUF Connect” → Install → Activate. The plugin auto-generates a WooCommerce REST API key, registers itself, and prompts you to connect a marketplace. No code, no FTP, no developer. The plugin lives inside your WordPress install so it respects your existing user roles, security plugins, and hosting setup.

Step 2: Connect your Whatnot shop via the bundled extension

Click “Connect Whatnot” in the FLUF Connect dashboard. Whatnot does not have a documented public API — authentication uses a cookie-based session captured by FLUF Connect’s bundled Chrome extension. You sign in to whatnot.com in your normal browser; the extension intercepts the session identifiers, posts them to your WordPress install, and stores them encrypted in user meta. Setup takes about a minute. The same extension also captures Whatnot’s category tree (which lives behind base64-encoded IDs that change per region) and shipping profiles so the dashboard can render real category options when you crosslist.

Step 3: Apply for category access where Whatnot requires it

Whatnot gates certain high-value categories — trading cards, sports cards, sneakers, and luxury bags among others — behind a seller application that reviews provenance, authentication process, and inventory volume. If your WooCommerce store sells in any of these categories you must apply directly on Whatnot before listings will publish. FLUF Connect flags the gated categories during product selection so you do not push to a category you cannot yet sell in.

Step 4: Select what to crosslist

Your WooCommerce products appear in the FLUF dashboard with their Whatnot status — already on Whatnot, queued, or WordPress-only. Filter by WooCommerce category, brand, SKU prefix, tag, or stock level. The dashboard surfaces which products are Whatnot-eligible (BIN-shaped, with structured attributes available) versus better held for a live show.

Step 5: Push to Whatnot with photos, category and attributes mapped

FLUF takes each WooCommerce product’s title, description, gallery, price, quantity, SKU, brand and condition and creates a corresponding Whatnot Buy It Now listing via the CreateListing GraphQL mutation. Images upload through Whatnot’s three-step pre-signed S3 path; once registered, the FLUF Connect plugin saves the returned Whatnot listing ID against your WooCommerce post as pushed_whatnot_id meta so subsequent syncs target the right listing. Category is resolved from Whatnot’s per-region category tree (the catalogue your extension synced in Step 2), and shipping profile is selected from Whatnot’s reusable size buckets (“UK Small”, “UK Medium” etc.) using your product weight if you have one set.

Step 6: Inventory stays synchronised in both directions

When stock changes in WooCommerce — a sale on your WordPress store, a manual adjustment, a supplier feed — the corresponding Whatnot listing’s quantity updates via the updateListing2 mutation. When something sells on Whatnot, the WooCommerce stock_quantity decreases automatically to match. The check runs every three minutes via WordPress cron. When stock reaches zero or you sell out manually, FLUF Connect delists the Whatnot listing from the Marketplace surface rather than leaving an out-of-stock item stranded.

Step 7: Whatnot orders appear in your WooCommerce admin

Every Whatnot Buy It Now sale flows back into your WooCommerce orders screen via the SellerHubGetMyOrders sync so you can fulfil from your existing workflow — your shipping plugin, accounting integration, or warehouse system. Whatnot supplies the shipping label directly (USPS in the US, Royal Mail domestic / DPD international in the UK) at no cost to the seller, so the WooCommerce-side order record is for fulfilment tracking and accounting rather than label purchase.

Buy It Now vs Live-Stream Listings — What FLUF Connect Does and Does Not Do

This is the single most important thing to understand about crosslisting WooCommerce to Whatnot, and it is where most automation tools mislead sellers.

Whatnot has two distinct selling formats. Live shows are real-time video auctions where the seller is on camera, running back-to-back auctions or fixed-price sales, answering buyer questions in chat, and shipping the items after the stream ends. Marketplace (off-stream) listings are persistent Buy It Now listings that sit in Whatnot’s catalogue and search results between shows. The FLUF Connect plugin pushes WooCommerce products as Buy It Now / Marketplace listings — the structured-catalogue path. We do not — and structurally cannot — generate live-stream auction inventory automatically: a live show is a human-driven event where you, the seller, decide what to feature, what to start the auction at, and how long to run it.

The practical implication for a WooCommerce store: your crosslisted catalogue gives you a permanent Whatnot storefront that earns sales between live shows and provides the inventory pool you can pull from when you decide to go live. Many serious Whatnot sellers structure their week around this — Marketplace listings handle the steady passive revenue, and a two-to-three-show-per-week live cadence drives the discovery, community building, and inventory velocity that the Whatnot algorithm rewards.

If you have no intention of ever running live shows, Whatnot is still a viable channel for a WooCommerce store via the Marketplace path alone — but you are leaving a significant chunk of the platform’s potential on the table. The buyer base shows up for the entertainment as much as for the listings.

FLUF Connect vs Listing on Whatnot by Hand

Manual Whatnot listing was designed for casual sellers and live-show pickers; it does not scale to a WordPress store catalogue.

For a WordPress store with even a hundred SKUs, manual Whatnot Marketplace management is a meaningful weekly time commitment. With FLUF Connect it collapses to a few minutes of dashboard oversight.

What Makes FLUF Connect the Right WordPress Plugin for Whatnot

A handful of integrations claim to push WooCommerce to Whatnot. FLUF Connect’s approach differs in four meaningful ways that matter once you are actually selling.

Built around Whatnot’s actual API constraints

Whatnot does not have a documented public API. Its GraphQL endpoint at whatnot.com/services/graphql/ is undocumented, gated by Kasada bot protection that rejects most server-side traffic, and uses base64-encoded category IDs that vary by region. Many “Whatnot integrations” work via brittle screen-scraping or expect you to manually export and import CSVs. FLUF Connect combines the bundled Chrome extension (which runs in your authenticated browser context where Kasada accepts requests) with server-side orchestration — the same hybrid model FLUF uses for Vinted and Facebook Marketplace. This is more robust than scraping and survives Whatnot’s frequent UI changes.

Real category tree, real shipping profiles

Whatnot’s categories and shipping profiles are not static and not trivially scraped. FLUF Connect’s extension syncs the full category tree on connect (storing it in a dedicated whatnot_categories table) along with per-category attributes and reusable shipping profiles (“UK Small”, “UK Medium”, US equivalents). When you crosslist a WooCommerce product, the dashboard picks the right leaf category, the right attributes for that leaf, and the right shipping profile for your product weight — automatically, not from a stale dropdown.

Gated-category awareness

Whatnot gates several high-value categories — trading cards, sports cards, sneakers, luxury handbags, jewellery — behind seller applications. Pushing to a gated category without approval silently fails. FLUF Connect surfaces which categories require approval at the point of selection so you do not waste time queueing items you cannot yet publish.

One plugin for many marketplaces

FLUF Connect also supports eBay, Depop, Vinted, Etsy, Shopify, Facebook Marketplace, Poshmark, and others from the same WordPress install. Most collectibles-focused WooCommerce stores end up on three or four marketplaces; doing that through one plugin avoids credential sprawl and gives you a single source of truth for inventory across every channel.

What Data Transfers from WooCommerce to Whatnot

Photos and the Whatnot Visual Standard

Whatnot is more forgiving than Depop or Poshmark on photo composition — buyers expect collectibles photos to look like collectibles photos, not editorial fashion flats. The featured image is what surfaces in Marketplace search and in your shop tile, so make sure your primary WooCommerce gallery image is the strong product shot. Whatnot accepts up to 8 photos per Marketplace listing. FLUF Connect uses the first 8 images from your WooCommerce product gallery, featured image taking the primary slot.

Whatnot has no aspect-ratio crop requirement on Marketplace listings (this differs from live-stream “card show” thumbnail formats), so your existing WooCommerce gallery images push as-is via the three-step pre-signed S3 upload path: FLUF Connect calls Whatnot’s GenerateMediaUploadUrls mutation, PUTs your binary to each returned URL, then registers the upload with AddListingPhoto. The whole sequence runs server-side per product, so a large initial push takes minutes per hundred SKUs rather than hours.

WordPress Admin Tips for Multi-Channel Collectibles Sellers

WP-CLI for catalogue audits

wp post meta get <product_id> pushed_whatnot_id tells you whether a specific WooCommerce product is on Whatnot. wp post list --post_type=product --post_status=publish --meta_key=pushed_whatnot_id --format=csv exports your full Whatnot-pushed catalogue for spot-checking. Useful when auditing a large initial push or investigating why a specific item is not showing up on Whatnot.

WooCommerce hooks for custom Whatnot behaviour

Hook woocommerce_product_set_stock to fire a Slack notification when a Whatnot bestseller hits low stock. Hook woocommerce_order_status_completed to trigger downstream actions when a Whatnot order is fulfilled. FLUF Connect uses standard WooCommerce hooks so any code that listens to product or order events continues to work — Whatnot orders appear as regular WooCommerce orders with channel metadata.

WPML and multi-currency stores

Whatnot operates in USD (US/Canada), GBP (UK), and EUR (Germany, France, Netherlands, Belgium, Austria) with separate seller accounts per region. If your WordPress store runs WPML or a multi-currency plugin, FLUF Connect uses your primary currency for the Whatnot push and falls back to your stored whatnot_seller_currency (resolved from Whatnot’s CurrentUser response when you connect).

Self-Hosted WordPress: Why Whatnot Sellers Should Care

Whatnot can change its fees, algorithm, category gating, or seller policies at any time, and as a fast-growing private company it absolutely will. A WordPress store running in parallel is an insurance policy — every Whatnot buyer you can convert to a direct WooCommerce customer is a buyer Whatnot cannot take away from you. Established Whatnot sellers in the collectibles space frequently use WooCommerce as their long-term canonical inventory database, with Whatnot as the high-velocity acquisition and entertainment surface.

Data ownership matters here too. Your WordPress install owns the canonical product, order, and customer records on hosting you control. Whatnot buyer personal data stays on Whatnot per their privacy policy, but order references and SKU sales history accumulate in your WooCommerce database. If a Whatnot account is ever suspended, restricted, or migrated between regions, the WooCommerce-side records persist intact.

Pricing for Whatnot Crosslisting: No Listing Fees, 8% Commission

Whatnot listings themselves do not cost anything to create — there are no listing fees, no monthly subscription, and no shipping-label markup. Whatnot supplies the label directly (USPS in the US, Royal Mail domestic and DPD international in the UK) at no cost to the seller. The cost is the 8% commission on US sales (6.67% + VAT in the UK) plus the 2.9% + $0.30 payment processing fee on the total order, charged only when an item sells. This makes Whatnot a cost-efficient channel to test for any WooCommerce store with the right inventory mix — you only pay when you earn.

FLUF Connect does not auto-spend on Whatnot’s optional paid visibility tools (Promote Full Show, Boost, Bumps). Those are live-stream-side decisions you make per show, not per Marketplace listing. The smart sync and automatic relisting behaviour FLUF Connect provides handles the organic Marketplace visibility play; promoted shows are for the live cadence you build alongside.

Which WooCommerce and Whatnot Setups Are Supported?

The FLUF Connect plugin requires WordPress 6.0+ and WooCommerce 7.0+ (PHP 7.4+). On the Whatnot side, the bundled Chrome extension is supported on Chrome, Edge, and Brave on macOS and Windows. Your Whatnot seller account must be active in one of the supported regions: United States, Canada, United Kingdom, Germany, France, Netherlands, Belgium, Austria, or Australia. If you sell in categories Whatnot gates (trading cards, sports cards, sneakers, luxury handbags, certain jewellery sub-categories), you must complete Whatnot’s category-access application before crosslisted products in those categories will publish.

FLUF Connect Pricing

FLUF Connect uses transparent, simple pricing. Every plan includes the WordPress plugin, all channels — Whatnot, Depop, Vinted, eBay, Etsy, Shopify, Facebook Marketplace, Poshmark — and every automation feature. The only difference between plans is the active product cap. The cheapest paid tier is Growth at £19/month for 500 products; FLUF Connect does not offer a no-cost tier.

Whatnot’s own 8% commission plus payment processing applies separately and is deducted by Whatnot at payout. Automation features — inventory sync, automatic delisting on sell-out, category and shipping-profile resolution, bulk operations — are included in every plan, not a paid add-on.

Related Guides

• All channels FLUF Connect supports — overview hub including WooCommerce and Whatnot
• WooCommerce crosslisting — the full hub for crosslisting your WooCommerce store to every channel
• Crosslist from WooCommerce to Vinted — reach Vinted’s 100M+ European buyers from your WordPress store
• How to sell on Whatnot — the 2026 guide — full Whatnot seller fundamentals including live-show strategy
• Crosslist from Shopify to Whatnot — the same workflow for Shopify store owners
• Crosslist WooCommerce to eBay — for sellers expanding beyond Whatnot
• Crosslist WooCommerce to Depop — fashion-focused sister page
• Inventory Sync — how two-way sync prevents overselling across every channel
• FLUF Connect pricing — plans start at £19/month, all channels included

Sources & Verification

• Whatnot scale, GMV, and Series F: Whatnot company news
• Whatnot seller fees and category gating: Whatnot Help Center
• Whatnot UK and Europe expansion: Whatnot UK & EU blog
• WooCommerce REST API reference: WooCommerce REST API docs