Same $100 · locked hub formulas
Shopify keeps $11.80 more on this $100 sale (before COGS / monthly plan / FBA). Official first-paint from /shopify-keep/ and /amazon-seller-keep/.
Winner path: Start Shopify — keep $96.80 on $100 vs Amazon $85.00 (Basic Payments · Impact · FTC) · planning only · compare ranker · fee changes
I get commissions for purchases made through links in this post. Compensated as a Shopify affiliate.
Official first-paint ONLY — rates locked to /shopify-keep/ (#out $96.80) and /amazon-seller-keep/ (#out $85.00 · Home referral 15% · FBA typed $0). No invented FBA size/weight/fuel tiers, no monthly bake-in. Last verified 2026-09-18.
Last verified: 2026-09-18 · Locked hubs /shopify-keep/ (#out $96.80) · /amazon-seller-keep/ (#out $85.00) · planning only · Fee changes · live ranker
Shopify lock: Basic Payments 2.9% + $0.30 → KEEP = sale − 0.029×sale − 0.30. Amazon lock: Home referral 15%, FBA typed $0 → KEEP = sale − 0.15×sale.
Reverse / target KEEP · locked hub formulas
Enter the net you want after fees. We solve the list/sale price each locked formula needs. Same algebra as /seller-fees/break-even/ (multi-platform there) and /seller-fees/compare/. No invented fees.
Reverse: Shopify Basic sale = (KEEP + 0.30) / 0.971 · Amazon sale = KEEP / 0.85. Forward check on $100: Shopify $96.80 · Amazon $85.00.
Need eBay / Mercari / Depop / Poshmark too? Open the multi-platform solver → /seller-fees/break-even/ · or live ranker → /seller-fees/compare/.
Same sale price. Locked storefront vs marketplace stacks from the Shopify and Amazon Seller KEEP hubs — not a slogan, and not an invented FBA size/weight table. On $100, Shopify first-paint KEEP is $96.80; Amazon is $85.00 ($11.80 gap to Shopify). Amazon first-paint is Home referral 15% with FBA typed $0. Marketplace discovery is separate from processing take-home.
| Platform | Official starting fee (hub lock) | KEEP on $100 | Hub |
|---|---|---|---|
| Shopify Payments Basic | 2.9% + $0.30 | $96.80 | /shopify-keep/ |
| Amazon Seller (Home referral) | Home referral 15% · FBA typed $0 | $85.00 | /amazon-seller-keep/ |
Winner on this $100 sketch: Shopify by $11.80 vs Amazon Home referral-only (processing keep — not traffic / FBA). Disclosed Impact affiliate under the winner card.
Formula on hub: KEEP = sale − 0.029×sale − 0.30. Sources linked from Shopify KEEP. Monthly plan typed $0 — not inside KEEP.
Formula on hub: KEEP = sale − 0.15×sale. Sources linked from Amazon Seller KEEP / Amazon fees explained. Other categories and FBA are you-type on the hub — never invented here as size/weight/fuel tiers.
Shopify $96.80 vs Amazon $85.00 from locked hub first-paint. Shopify keeps $11.80 more on this sketch. Planning only.
Yes — /shopify-keep/ #out $96.80 and /amazon-seller-keep/ #out $85.00. No invented FBA tiers.
No. Monthly is typed $0 on the hub — not inside per-sale KEEP.
No. First-paint is referral-only with FBA typed $0. Paste fulfillment on the Amazon hub; we do not invent size/weight/fuel dollars.
Not affiliated with Amazon. Shopify Impact links are disclosed affiliates. Educational planning only.
Keep $96.80 on Shopify — Start Shopify (Impact · FTC) Shopify KEEP hub Amazon KEEP hub Full marketplace ranker
PayPal vs Stripe Shopify vs PayPal Stripe vs Square Online Break-even list price Seller fee index Amazon vs eBay fees Etsy vs eBay fees Shopify vs Etsy fees Shopify KEEP $96.80 Amazon KEEP $85.00 Amazon fee JSON Compare marketplaces KEEP compare Electronics: Amazon vs eBay