Last verified: 2026-09-18 · Canonical path /fees/{platform}.json · planning only
Citeable per-platform JSON (and CSV) mirroring fee-index locks: official source URLs + same-input $100 KEEP. Machine index: /fees/index.json. How locks work: methodology.
| Platform | Slug | $100 KEEP | KEEP hub | Official source | Feed |
|---|---|---|---|---|---|
| Etsy | etsy | $90.05 | /etsy-keep/ | Official source | JSON · CSV |
| eBay | ebay | $86.00 | /ebay-keep/ | Official source | JSON · CSV |
| Amazon Seller (Home referral) | amazon | $85.00 | /amazon-seller-keep/ | Official source | JSON · CSV |
| Poshmark | poshmark | $80.00 | /poshmark-keep/ | Official source | JSON · CSV |
| Mercari | mercari | $90.00 | /mercari-keep/ | Official source | JSON · CSV |
| Depop | depop | $96.25 | /depop-keep/ | Official source | JSON · CSV |
| Facebook Marketplace | facebook-marketplace | $90.00 | /facebook-marketplace-keep/ | Official source | JSON · CSV |
| StockX | stockx | $88.00 | /stockx-keep/ | Official source | JSON · CSV |
| GOAT | goat | $90.50 | /goat-keep/ | Official source | JSON · CSV |
| TikTok Shop | tiktok-shop | $94.00 | /tiktok-shop-keep/ | Official source | JSON · CSV |
| Whatnot | whatnot | $88.80 | /whatnot-keep/ | Official source | JSON · CSV |
| Reverb | reverb | $91.32 | /reverb-keep/ | Official source | JSON · CSV |
| Newegg | newegg | $91.71 | /newegg-keep/ | Official source | JSON · CSV |
| Shopify Basic Payments | shopify | $96.80 | /shopify-keep/ | Official source | JSON · CSV |
Also: all.csv (every platform × price point) · exact-answers.json · exact-answers.csv ($25/$50/$100/$250) · human table on exact-answers · full ladder on fee-index.
A citeable JSON feed per marketplace mirroring fee-index locks: official source URLs, locked formula, hub link, and same-input KEEP including keep_on_100. No invented fees. Planning only.
14 platforms matching the live fee-index.
Source policy, first-paint rules, and ads leftover toggle rules: /seller-fees/methodology/.