Crosslist from BigCommerce to Whatnot \u2014 Automatically

Whatnot started as livestream auctions and has become one of the fastest-growing marketplaces in e-commerce — but a lot of sellers do not realise it also supports static Whatnot Buy It Now listings that buyers can find and purchase any time, even when you are not live. That is exactly the shape a BigCommerce catalog fits. Crosslisting from BigCommerce to Whatnot turns the products you already manage into Whatnot listings, giving you a presence on the platform that you can then amplify in live shows when you want to.

The two platforms work in opposite directions. BigCommerce is your branded store: you own the experience but you bring the traffic. Whatnot is a destination with a young, highly engaged audience that opens the app to discover and buy — increasingly across collectibles, sneakers, fashion, beauty and electronics. FLUF Connect bridges them, reading your BigCommerce products and images and publishing them to Whatnot, and it extends the same catalog to other non-native channels like Depop, eBay and Vinted on one plan.

Why Sell on Both BigCommerce and Whatnot?

Sell on both because Whatnot reaches buyers your storefront never will — a young, fast-growing audience that treats shopping as entertainment. Your BigCommerce store converts the traffic you earn; Whatnot puts the same inventory in front of an app-native crowd that browses, bids and buys in the moment, then keeps coming back for live shows.

The momentum is hard to ignore. Whatnot sellers moved more than $2 billion in GMV in 2024, and the company projected over $6 billion for 2025, having reached a valuation near $5 billion in early 2025. The platform now operates across nine countries, with the UK among its fastest-growing markets. For a BigCommerce merchant in the right categories, that is a large, rising pool of demand to tap with inventory you already hold.

The fees are predictable and sale-only. Whatnot charges US sellers an 8% commission plus 2.9% + $0.30 payment processing on most categories — roughly 11–12% all-in — with reduced rates in some categories (5% on electronics, 4% on coins and money). There is no charge to list, so putting your catalog on Whatnot to see what moves costs you nothing until something sells.

There is also a discovery dynamic your storefront cannot match. Whatnot buyers browse by category and follow sellers, and the platform’s energy is built around live shows. A crosslisted BigCommerce product lands as a Buy It Now listing in your Whatnot profile shop — searchable and purchasable on its own — and you can feature it in a live show to drive a burst of demand. That blend of always-on listings plus live moments is something a static store simply does not offer.

For a BigCommerce merchant, the strategic value is reach into an audience that behaves differently from a typical store shopper. Whatnot’s buyers are younger, more impulsive and far more engaged — they follow sellers, return for scheduled shows, and buy in the moment rather than after weeks of consideration. That makes Whatnot a strong complement to the slower, intent-driven buying on your own domain: your store captures shoppers who arrive ready to purchase a specific product, while Whatnot captures impulse demand and discovery you would otherwise never reach. The same catalog, two very different buying motions, one subscription.

Whatnot scale: Fortune (2025) · seller fees: Whatnot fee schedule.

How to Crosslist from BigCommerce to Whatnot with FLUF Connect

FLUF Connect reads your live BigCommerce catalog and publishes products as Whatnot Buy It Now listings, mapping each field as it goes. You connect both accounts once — BigCommerce through a secure API token, Whatnot through your seller account — and then crosslist in bulk from one dashboard rather than re-creating listings in the Whatnot app. Set-up takes about ten minutes.

1. Create your FLUF Connect account and open the dashboard.
2. Link your BigCommerce store with a read-only API token. FLUF pulls your products, variants, photos and category structure straight from the BigCommerce V3 catalog API and watches the orders endpoint for sales, all without storing a password — you can revoke the token whenever you like.
3. Connect Whatnot so FLUF can publish listings to your seller account.
4. Import your BigCommerce catalog — pull in everything, or filter to the categories that fit Whatnot by category, price or brand.
5. Review the mapping — FLUF pre-fills Whatnot’s title, description, price, condition, photos and category from your BigCommerce data, and flags anything that needs a value.
6. Select and crosslist — choose products and publish to Whatnot as Buy It Now listings, individually or in bulk.
7. Your listings go live on Whatnot, browsable in your profile shop — and you can feature any of them in a live show. From that moment FLUF keeps inventory and orders in sync.

Under the hood, FLUF translates every BigCommerce attribute into the Whatnot listing equivalent, pushes your photos across, and drops each product into the nearest Whatnot category — some of which, like electronics, carry a lower commission than the standard rate. Whatnot’s own guidance is that complete “Quality Listings” — full details, photos and attributes — get better discovery than thin ones, so FLUF carries across as much of your structured BigCommerce data as Whatnot accepts. You can also set auto-crosslisting rules so qualifying new products publish to Whatnot automatically, and crosslist a whole category in a single bulk run.

What Transfers When You Crosslist from BigCommerce to Whatnot?

BigCommerce stores structured product data — a product with variants, images, a description, a price and a category. A Whatnot Buy It Now listing needs a category, a keyword-rich title, a description, a price, a condition, photos and shipping. FLUF carries your BigCommerce data into that shape automatically.

Field Mapping — BigCommerce to Whatnot

Listing fields: How to list on Whatnot · category commissions: Whatnot fee schedule.

Category Mapping Examples

Buy It Now vs live: set the right expectation

It is worth being clear about how Whatnot works so your crosslisted catalog performs. A crosslisted BigCommerce product becomes a Buy It Now listing in your Whatnot profile shop — it is searchable, browsable and purchasable on its own, day or night. But Whatnot’s algorithm leans heavily toward live content, so static listings tend to see slower discovery than items featured in a show. The winning pattern is to use FLUF to get your whole catalog onto Whatnot as always-on listings, then feature your best items in live shows to create bursts of demand. Crosslisting builds the shelf; the live show drives the rush.

Fields that need your attention

• Category fit. Whatnot indexes heavily on collectibles, sneakers, fashion, beauty and electronics — filter your import to inventory that suits that audience.
• Shipping. Set your Whatnot shipping profile once; FLUF maps the listing fields, you confirm the shipping option.
• Condition and photos. Complete details earn better discovery — let FLUF carry across your full BigCommerce data rather than thin listings.
• Go live for velocity. Treat crosslisted listings as your base and feature standout items in shows.

What Syncs (and What Doesn’t)

Whatnot exposes order data and lets FLUF end listings, so this pair gets genuine two-way inventory protection — but not relisting or offer automation. Here is exactly what is automatic.

What this pair supports (no overclaiming):

• Inventory sync / never oversell. Stock is matched both ways across BigCommerce and Whatnot.
• Order sync. Whatnot orders flow back into FLUF’s central order view.
• Automatic mark-as-sold. A sale on either side ends the counterpart so the same unit is never sold twice.
• No relisting on Whatnot. Whatnot does not expose relisting, so FLUF does not claim it for this channel.
• No offer automation. Buy It Now items can receive buyer offers on Whatnot, but FLUF does not automate sending offers here.

Automation for BigCommerce + Whatnot Sellers

The automation for this pair is about getting your catalog onto Whatnot fast and keeping it from overselling — not relisting or offer campaigns, which Whatnot does not expose. Every feature below is included in every FLUF plan, not a paid add-on.

Bulk crosslisting and filtered imports

Bulk-publish a whole category from BigCommerce to Whatnot in one run, and filter your import so only Whatnot-appropriate inventory goes across rather than your entire store. Find-and-replace and bulk edits let you adjust titles or prices across many Whatnot listings at once.

Auto-crosslisting rules

Set a rule once — for example, “every new product in Collectibles” — and FLUF crosslists qualifying BigCommerce products to Whatnot automatically as you add them, so your Whatnot shelf tracks your catalog without manual effort.

One inventory view across live and online

Because Whatnot supports order sync and mark-as-sold, FLUF keeps one inventory view across Whatnot and every other channel. Whether an item sells in a Whatnot live show, as a Buy It Now, or on your store, stock and orders stay matched so you never sell the same unit twice.

If you also sell on marketplaces that support relisting and offers, those tools are included on the same plan. See BigCommerce to eBay or BigCommerce to Depop for how the feature set shifts by channel.

What sells well crosslisted from BigCommerce to Whatnot

Whatnot rewards high-velocity, browse-friendly inventory: trading cards and TCG, collectibles, sneakers, streetwear, beauty, jewellery and electronics. Deep, repeating stock works well as an always-on Buy It Now shelf you can dip into for live shows; one-off and collectible pieces shine in live auctions. Slow, bespoke single-SKU catalogs fit Whatnot less well — which is exactly why filtering your BigCommerce import to the right categories, rather than pushing everything, gets the best results.

A practical way to think about it: use crosslisting to put your full eligible catalog on Whatnot as a standing shelf, then build a rhythm of live shows around your best sellers. Each show pulls from inventory FLUF has already published and kept in sync, so you are never re-creating listings before going live, and a sale in the show — like any Whatnot sale — flows straight back into FLUF and pulls the item from your store and other channels. That removes the single biggest operational headache of selling on a live platform alongside a store: the manual scramble to keep stock honest across both after every sale.

Building a Whatnot rhythm: shows, breaks and the algorithm

Whatnot rewards sellers who turn listing into broadcasting. The platform grew out of trading-card “breaks” — live events where a host rips packs and viewers buy spots in real time — and that entertainment DNA still shapes how products get discovered. A scheduled weekly show, a recognisable host persona, giveaways to grow followers, and a fast-talking auction cadence all feed the algorithm that decides whose stream gets surfaced. Static Buy It Now listings are your shelf; the live show is your shop window, and the two reinforce each other. For a BigCommerce merchant, the workable model is to let FLUF publish your eligible catalog as always-on BIN inventory, then theme shows around what is selling: a sneaker drop night, a vintage tee run, a Pokémon and TCG break, an electronics clearance hour. Categories that thrive on Whatnot’s energy — sports cards, Funko, sealed games, hyped sneakers, beauty hauls, jewellery — benefit most from the live treatment, while the BIN catalog quietly captures off-show buyers browsing your profile shop at midnight. Watch the seller-to-buyer dynamics: new sellers who never go live struggle for reach, because the system optimises for live engagement, viewer retention and chat activity. The good news is that crosslisting removes the listing chore entirely, so the time you would have spent re-keying products goes instead into the part that actually drives Whatnot sales — showing up live, consistently, with inventory FLUF has already published and kept in sync across every channel you sell on.

It helps to know the vocabulary of the platform before you go live. Whatnot’s collector core speaks in breaks and rips: a “razz” sells random spots, a “pick-your-slot” lets buyers choose a team or character, and graded “slabs” — PSA, CGC and BGS encapsulated cards — command premiums over raw singles. Pokémon, Magic: The Gathering, Yu-Gi-Oh, One Piece and sports cards anchor the trading-card economy, while sealed wax, Funko Pops, comics and TCG accessories round it out. Beyond collectibles, the sneaker, vintage, beauty and jewellery rooms each have their own regulars and their own peak hours. A host who learns this culture — running themed shows, hyping the next lot, rewarding loyal viewers with deals — converts browsers into a following that returns week after week. For a BigCommerce seller, the move is to match your inventory to a room: if you stock sealed games or graded cards, lean into the breaks format; if you carry sneakers or streetwear, run a fast-paced drops show; if your range is broader, use Buy It Now as the always-open shelf and feature a rotating highlight live. FLUF does the unglamorous part — publishing and syncing your catalog as Buy It Now inventory across every channel — so the energy you bring to Whatnot goes entirely into the live performance that the platform actually rewards.

How Much Does It Cost to Crosslist from BigCommerce to Whatnot?

FLUF Connect charges a flat monthly subscription with no per-sale commission on top of Whatnot’s own fees. Plans start at £19/month (Growth — 500 products). There is no free plan.

Every plan includes crosslisting, bulk tools, two-way sync and the full automation set across all supported channels, not just Whatnot. Automation is included in every plan, not a paid add-on, so you can add eBay, Depop, Vinted or Etsy on the same subscription. See the full pricing page, or browse all pairs on the crosslisting hub.

Selling collectibles across several channels? The same BigCommerce catalog can reach eBay and Depop alongside Whatnot. New to multi-channel selling? Read our guide to selling on multiple platforms.

Sources & Verification

• Whatnot 2025 GMV projection & markets: Fortune (2025)
• Whatnot 2024 GMV ($2B+): TechCrunch (2024)
• Whatnot ~$5B valuation: TechCrunch (2025)
• Whatnot seller fees & category commissions: Whatnot fee schedule
• Whatnot listing fields: How to list on Whatnot
• BigCommerce native marketplace coverage: BigCommerce omnichannel

Related guides

• Crosslist from BigCommerce to eBay
• Crosslist from BigCommerce to Depop
• Sell on BigCommerce — overview
• Sell on Whatnot — overview