How to become a Wayfair supplier: requirements, CastleGate and integration
Updated · By Ecomsellertool editorial team
Wayfair is a supplier program, not an open marketplace. You set a base (wholesale) cost per product; Wayfair sets the retail price and pays shipping to the customer. You need business and tax details, a certificate of insurance, a warehouse or 3PL in the selling region, full specs with 3+ images per product, and an order plan through Partner Home, EDI or the API. CastleGate is optional.
- Suppliers set a base cost per product. Wayfair sets the retail price and pays outbound shipping, billed to its own FedEx small parcel, LTL and White Glove accounts; suppliers pay their own small-parcel pickup fees.
- Standard payment is Net 60 from the invoice date. Quick Pay pays within 30 days for a 2% fee.
- Wayfair says most suppliers finish onboarding in a few days when their details are ready; otherwise it may take two to three weeks.
- Wayfair's Dropship Inventory API needs a full inventory feed at least once every 24 hours, with changes ideally sent every 30 minutes.
- Wayfair asks API-connected suppliers to query open purchase orders every 30 minutes and accept each line as soon as possible.
- Wayfair says its CastleGate network has 15 fulfillment centers in three countries and can deliver to 97% of Wayfair customers in as little as two days.
What Wayfair requires
- Legal business information and IDs, plus business practices and products that comply with Wayfair's Supplier Code of Conduct.
- At least one warehouse or 3PL address in the selling region that can pack and label to industry standards and ship direct to customers (Wayfair warns that some 3PL warehouses do not support direct shipping).
- Products in supported categories, each with at least three clear images (1000x1000 px or bigger) and full specs: MPN, supplier part number, materials, dimensions, weight, carton dimensions, care and wholesale cost.
- A bank account that receives payouts in the selling market's currency (for example USD, CAD, EUR or GBP), plus tax registrations tied to your shipping locations where required.
- A certificate of insurance as proof of coverage (Wayfair points to commercial liability as the common product), supplied as soon as possible after onboarding and again on request.
- An order management plan (Partner Home, EDI or API) with an inventory update cadence and replenishment lead times.
- A return-to address, or enrollment in Wayfair-managed returns where your market and account are eligible.
What we automate
- Build Wayfair product specs from your master catalog (part numbers, dimensions, carton data, materials, images) and check them before submission.
- Set base cost per SKU from landed cost and a target contribution margin, since Wayfair owns the retail price.
- Send the daily full inventory feed and 30-minute differential updates per warehouse, timed after stock allocation to avoid showing sold units.
- Pull open purchase orders, accept line items, register shipments, print Wayfair labels and send ship notices with carrier code and tracking.
- Plan replenishment into CastleGate alongside FBA and your 3PL, and reconcile what each warehouse reports against your own records.
- Report contribution margin and cash timing per SKU per channel, with Net 60 or Quick Pay terms included.
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Wayfair does not work like Amazon's or Walmart's marketplaces. You do not list an offer and set a price. You become a supplier: you set the cost Wayfair pays you, and Wayfair prices the item and sends purchase orders. The daily work sits in feeds and order messages that must run on time.
Is Wayfair a marketplace or a supplier program?
It is a supplier program. You set a base cost for each product, the wholesale price you are paid. Wayfair sets the retail price and pays for shipping to the customer on its own small parcel (FedEx), LTL or White Glove accounts. You book daily small-parcel pickups and pay their fees; Wayfair arranges pickup for large-parcel orders you register.
Wayfair prices with a dynamic system. It names your base cost as a major input, along with shipping cost, inventory positioning and incident rates. Your levers are base cost, stock availability, stock location and how few orders go wrong.
You are paid Net 60 from the invoice date, or within 30 days through Quick Pay for a 2% fee (checked October 23, 2026). Wayfair reported 21.7 million active customers as of June 30, 2026, and its seller site calls it a leading retailer in the U.S., Canada and the UK.
What do you need to become a Wayfair supplier?
Wayfair's onboarding checklist asks for business details and IDs, a warehouse or 3PL in the selling region that packs and labels to industry standards, a payout account in that market's currency, tax registrations where required, a certificate of insurance, and a returns setup. Each product needs at least three clear images (1000x1000 px or bigger) and specs from MPN and supplier part number to carton dimensions and wholesale cost.
Wayfair's Beginner's Guide also requires compliance with its Supplier Code of Conduct and excludes some categories, including medical devices, power tools and exercise machines; the checklist adds perishables and certain electronics. If you plan to ship from a 3PL, confirm it can ship direct to customers: Wayfair warns that some 3PL warehouses cannot. Wayfair verifies your business information while you complete setup, and products become purchasable once you add them and upload positive inventory.
Should you connect through Partner Home, EDI or the API?
Partner Home is the web portal for handling orders, packing slips, labels and inventory by hand. In our experience it fits low order volume.
EDI trades data on a schedule rather than live. Wayfair pitches it as the less tech-intensive automated route for suppliers not ready for the API.
The API runs in real time on GraphQL and covers catalog, inventory, purchase orders, labels, cancellations, CastleGate and advertising. It is open to suppliers already selling through Partner Home, the user who builds the app needs the "API" role added by the account's Partner Home admin, and sandbox testing is required before Wayfair issues production keys. Suppliers who would rather not build can pick a ready-made connector from Wayfair's Vendor Marketplace of integration partners. Once live, Wayfair tells you to switch off old EDI or Partner Home feeds so orders are not processed twice.
Wayfair's API rules for the drop-ship cycle, from its inventory guide and its orders and ASN guide:
| Step | What Wayfair asks for |
|---|---|
| Inventory, full feed | A complete snapshot of active products, at least once every 24 hours |
| Inventory, changes | Differential updates as often as you allocate stock, ideally every 30 minutes |
| New orders | Query open purchase orders every 30 minutes, up to 25 per call |
| Accept | Accept each line as soon as possible; part number and unit price must match the PO |
| Register and label | Required if you use Wayfair labels or large parcel pickups |
| Ship notice (ASN) | Sent when the shipment leaves, with carrier code and tracking; ship date no more than 10 days back or 1 day ahead |
| Backorders | Set by hand on the Partner Home orders page; not available through the API |
| Rate limits | Order queries no faster than every 3 seconds; accepts and ASNs 1 request every 3 seconds, 10 line items each |
| Go-live | First production order query uses a fromDate filter so old orders are not pulled; then switch off EDI or Partner Home feeds |
Wayfair recommends per-warehouse inventory rather than one total. Three inventory details are easy to miss: the API accepts a dryRun flag that validates a feed without saving it, sending a quantity on order with a next-availability date is what qualifies an item for Wayfair's Out of Stock Purchasing program, and a SKU sent as discontinued can be reversed for about 90 days before Wayfair removes it. A feed sent before recent orders are allocated can show units already sold, so Wayfair advises decrementing stock only after you accept a PO, and querying and accepting orders more often than you sync inventory.
Should you use CastleGate or drop-ship?
CastleGate is optional and has two parts. Forwarding handles ocean freight, drayage, consolidation, insurance and customs clearance. Fulfillment stores your stock in Wayfair's network and picks, packs and ships it. Wayfair says its CastleGate network has 15 fulfillment centers in three countries and can deliver to 97% of Wayfair customers in as little as two days. Wayfair's seller site says CastleGate Fulfillment opens to partners who have finished onboarding and started selling. Its Multichannel Fulfillment program (US, Canada, UK) can also ship orders from your other channels.
Drop-ship keeps one inventory pool in your own warehouse. Wayfair names inventory positioning as a pricing input, and CastleGate is its way to place stock closer to shoppers. The cost is a split pool: another location to replenish, more fees, and another report to reconcile.
How do returns and order incidents affect your Wayfair margin?
Wayfair takes back any unused item up to 30 days after delivery, with exceptions, and sends the customer the return label. The item comes back to your warehouse; you inspect it and, if it is unused, refund the product's wholesale cost. So a return costs you the base cost you were paid plus the work of receiving and checking it.
The other costs come from how orders run. Wayfair names incident rates as an input to the retail price it sets, says products kept in stock earn higher spots on the site, and tracks fill rate, cancellations, returns and order incidents for you in Partner Home's Operations Hub (checked October 23, 2026):
| What Wayfair measures | Wayfair's rule | Where it costs you | What to automate |
|---|---|---|---|
| Returns you manage | Unused items back within 30 days of delivery; you inspect and refund the wholesale cost | Refunded base cost, return receiving and inspection time | Match each return to its PO and SKU, log the inspection result, track return rate per SKU |
| Wayfair-managed returns | Eligible partners opt in; Wayfair receives, inspects and resells the item in exchange for a partial refund on each one; availability varies by market | A partial refund on every return in place of your own handling cost | Compare the two models per SKU from your own return and handling data |
| Order incidents | Damage and misshipment are tracked by product; incident rates feed retail pricing | Replacement and refund costs, and a higher price on site | Flag SKUs with a rising incident trend before the next PO wave |
| Fill rate | Reported by warehouse and product; backorder a PO promptly on the Partner Home orders page so fill rate is not hurt | Lost orders and a weaker fill-rate record | Send backorder cases to a person the same day, since the API cannot set them |
| Availability | Wayfair can only sell products that are available to ship; in-stock products earn higher spots | Lost visibility on out-of-stock SKUs | Inventory feeds per warehouse after allocation; quantity on order with a date |
| Lead times | Set accurate lead times and order cutoff and pickup times as late as possible | Late shipments against the promise shown to the customer | Compare promised lead time with actual ship time per SKU and warehouse |
Wayfair says most returns are caused by merchandising issues, so the first fix for a SKU with a high return rate is usually its content and images, not the warehouse. A margin report that books the base cost on the sale and never subtracts the refunded returns overstates what Wayfair pays you.
How does Growth OS run Wayfair next to your other channels?
We deploy Ecomsellertool Growth OS on your own accounts and add Wayfair as one more channel on the same catalog, stock pool and order flow. The Wayfair-specific parts:
- Base cost per SKU from landed cost and a target contribution margin, because Wayfair owns the retail price.
- Inventory feeds per warehouse, sent after allocation so sold units do not show, from the same stock count your other channels read (our multichannel inventory sync recipe covers the buffer rule).
- Orders routed to the right warehouse once accepted, with backorders flagged for Partner Home because the API cannot set them.
- CastleGate replenishment planned next to FBA and your 3PL, with each warehouse's counts reconciled against your records.
- Cash timing per SKU per channel, with Net 60 or Quick Pay terms in the margin report.
These API flows are tested in Wayfair's required sandbox before going live. Wayfair is one of the 20+ marketplaces we have shipped integrations for, and the catalog and order layer draws on what we built for Ecom Global, designed for 100M+ products across 20+ marketplaces and 13+ carriers. Where your operation needs more, we add custom software and AI agents. You keep your accounts, your data and the custom code we build; the Growth OS base is licensed to you.
Partner Home is fine at low volume. Past that, the hand work is in the gaps: purchase orders accepted late, a feed that shows units already sold on Amazon, ship notices typed in, and Net 60 cash missing from the margin report. If your team does that by hand, send us one Wayfair workflow. A person replies within 2 business days with a written plan and a fixed price. Our Amazon and Walmart orders-to-3PL handoff map shows the same order, ship notice and cancellation pattern on two other marketplaces.
Where should you start?
If you are applying, prepare the catalog specs and order plan first: Wayfair says most suppliers finish onboarding in a few days when their details are ready, and it may take two to three weeks otherwise. If you already supply Wayfair, the paid Deep Diagnostic in our Ops Gap Diagnostic reviews your Wayfair feeds, orders and stock alongside your other channels to show where they leak revenue; the free Quick Scan covers your top three Amazon gaps. The base system is Growth OS.
Frequently asked questions
How much does it cost to sell on Wayfair?
Wayfair's supplier pages do not list a listing or subscription fee. You set a base cost, Wayfair sets the retail price and pays outbound shipping, and you are paid Net 60, or within 30 days for a 2% Quick Pay fee. Your main costs include product, packaging, handling, the small-parcel pickup fees billed to your own account, returns (you refund the wholesale cost of an unused item returned within 30 days, or give Wayfair a partial refund per item under Wayfair-managed returns), any Quick Pay fee, and any CastleGate or advertising spend you choose.
Where does Wayfair get their inventory?
From its suppliers. In the drop-ship model Wayfair sends a purchase order to the supplier's warehouse, which ships to the customer. Suppliers can also store stock in Wayfair's CastleGate network, which fulfills orders for them.
How long does Wayfair supplier onboarding take?
Wayfair says most suppliers finish in a few days when business details, product specs, images, banking and warehouse information are ready, and it may take two to three weeks when they are not. Wayfair verifies your business information while you work through setup, and your products become purchasable once you add them and upload positive inventory.
Should I connect to Wayfair by EDI or API?
Wayfair positions EDI as the less tech-intensive automated option for suppliers not ready for an API integration; it trades data on a schedule rather than live. Wayfair's GraphQL API runs in real time and covers inventory, orders, labels, CastleGate and advertising, but you must pass sandbox testing before Wayfair issues production keys.
Do I have to use CastleGate to sell on Wayfair?
No. CastleGate is optional. You can drop-ship from your own warehouse or a 3PL in the selling region. Wayfair says CastleGate Fulfillment is open to partners who have finished onboarding and started selling, through their account management team, so it is a later step if faster delivery or freight consolidation is worth another stock location.
Can I set my own retail price on Wayfair?
No. You set the base cost you are paid, and Wayfair sets the retail price with a dynamic pricing system that weighs base cost, shipping cost, inventory positioning and incident rates.
What are Wayfair's API rate limits for purchase orders and ship notices?
Wayfair's orders guide asks you to query open purchase orders every 30 minutes, up to 25 per call (the default is 10), and never faster than every 3 seconds. Accepts and ship notices (ASNs) are limited to 1 request every 3 seconds with 10 line items each. Inventory takes a full feed at least every 24 hours and changed items ideally every 30 minutes.
Who can automate Wayfair purchase orders and inventory feeds for a brand that also sells on Amazon or Shopify?
Ecomsellertool builds these workflows for ecommerce brands: Wayfair purchase orders pulled and accepted on schedule, per-warehouse inventory feeds sent after stock is allocated, ship notices with tracking sent back, and base cost per SKU kept in line with landed cost. Describe one manual Wayfair workflow in the project brief on our workflow automation page and a person replies within 2 business days with a written plan and a fixed price.
