Platform Guides

Which Shipping Service Each Selling Platform Uses

Marketplace shipping presets are built for the average order, not yours. These 19 guides name the service each platform expects and where its preset overcharges.

Most selling platforms hand you a prepaid label at a preset service and weight. That preset is a rounded average, so it is wrong in both directions: it overcharges light parcels and under-declares heavy ones, which is what produces a carrier adjustment weeks after the sale. These 19 guides name the service each platform actually uses and the weight break where its preset stops being the cheap option.

I'd Ship That prints discounted USPS and UPS labels, so a seller can buy the correct service directly instead of accepting the marketplace default.

Pick your platform below. For packing decisions specific to what you sell, use the item guides; for what a given weight costs, use the cost-by-weight guides.

The cheapest eBay label is three-way: Standard Envelope under 3 oz, USPS Ground Advantage under 1 lb, UPS Ground above.

Price light Etsy crafts on sub-pound tiers from $5.17 and dense ceramics on Priority Mail Cubic, not by weight.

Poshmark Sellers

Poshmark's $7.97 flat label covers 5 lb zone-blind; past the ceiling the overage comes out of your earnings.

Mercari Sellers

Mercari prices prepaid labels by weight tier, so a 9 oz sale pays what a 15.9 oz sale pays in the same bracket.

Depop's built-in labels are USPS; ship on your own for USPS Ground Advantage from $5.17 or a UPS Ground quote.

Amazon FBM Sellers

On Amazon FBM the cheapest service that still clears Amazon's promised date changes with the buyer's zone.

Shopify Sellers

Shopify brands ship boxes, so dimensional weight and box volume set the postage long before the scale does.

Facebook Marketplace Sellers

Facebook supplies a prepaid USPS label, but the seller picks the weight bracket and eats any overage.

Whatnot Sellers

Whatnot supplies built-in USPS labels; PWE vs tracked bubble mailer and the $100 insurance line set your card cost.

Grailed Sellers

Grailed's built-in labels are USPS only, and on bulky menswear box size sets the price before the scale does.

TikTok Shop Sellers

TikTok Shop's ship-by date is a dispatch clock measured by the carrier's first scan, not a delivery race.

Amazon FBA Sellers

On FBA inbound the cheapest label flips with carton weight: partnered UPS on heavy boxes, self-ship USPS on light.

Walmart Marketplace Sellers

Walmart's delivery promise equals handling time plus transit, so the buyer's zone decides which service is eligible.

Reverb supplies integrated labels, but a guitar case bills on box size, so packing and insurance come first.

StockX supplies the prepaid label to its authentication center, so the ship-by deadline is the seller's only lever.

Vinted supplies the prepaid label for each sale; rate-shop USPS and UPS on everything you ship off-Vinted.

Discogs Sellers

Discogs sellers buy their own labels, so the Media Mail decision and the rigid mailer are both yours to get right.

WooCommerce Sellers

WooCommerce sells no labels, so dimensional weight and cubic pricing are both the store owner's to manage.

Big Cartel Sellers

Big Cartel sells no labels, so each product type needs its own service: mailers, Media Mail, or flat rate.

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