Skill: leooooooow/marketplace-fee-calculator (version 1.1.0)

--- name: Marketplace Fee Calculator description: Calculate and compare total selling fees across major e-commerce marketplaces (Amazon, eBay, Etsy, Walmart, Shopify) including referral fees, fulfillment costs, subscription tiers, and hidden charges to optimize channel profitability. --- # Marketplace Fee Calculator Understand the true cost of selling on every major marketplace before committing inventory and resources. This skill breaks down fee structures, calculates net margins per channel, and helps you decide where to sell—and where to avoid. ## Quick Reference | Decision | Strong | Acceptable | Weak | |---|---|---|---| | **Fee identification** | All fee types mapped per marketplace with current rates | Major fees identified, minor ones estimated | Only referral/commission fees considered | | **Net margin calc** | Per-SKU net margin after ALL fees, per marketplace | Category-level average margin | Gross margin minus "about 15%" | | **Channel comparison** | Side-by-side net profit per unit across 3+ channels | Two channels compared | Single channel evaluated in isolation | | **Hidden cost inclusion** | Storage, long-term fees, returns, advertising factored in | Storage and returns included | Only transaction fees counted | | **Break-even volume** | Minimum units per marketplace to cover fixed/subscription costs | Subscription cost acknowledged | Fixed costs ignored | | **Fee optimization** | Active strategies to reduce fees (FBA vs FBM, category choice, pricing) | Awareness of optimization options | No fee reduction strategies | ## Solves 1. **Margin surprise** — Discovering after launch that marketplace fees eat 40%+ of revenue 2. **Wrong channel choice** — Selling on a marketplace where fees make the product unprofitable 3. **Hidden fee blindness** — Missing storage fees, long-term inventory fees, return processing fees, and advertising costs 4. **Subscription waste** — Paying for professional/advanced marketplace subscriptions without sufficient volume to justify them 5. **Category mistakes** — Listing in high-fee categories when a lower-fee category is available 6. **FBA vs FBM confusion** — Not knowing when self-fulfillment is cheaper than marketplace fulfillment 7. **Price erosion** — Setting prices that don't account for marketplace-specific fee structures ## Workflow ### Step 1: Map Your Product Details Gather the information needed for accurate fee calculations: | Field | Value | Why It Matters | |---|---|---| | Product category | [e.g., Kitchen & Dining] | Determines referral fee % | | Selling price | [$XX.XX] | Base for percentage-based fees | | Product weight | [X lbs, X oz] | Affects fulfillment/shipping fees | | Product dimensions | [L × W × H inches] | Determines size tier | | COGS per unit | [$XX.XX] | For net margin calculation | | Monthly volume (est.) | [X units] | For subscription tier analysis | | Packaging weight | [X oz] | Added to product weight for shipping | ### Step 2: Calculate Amazon Fees **Referral Fees** (per sale): | Category | Rate | Minimum | |---|---|---| | Most categories | 15% | $0.30 | | Clothing & Accessories | 17% | $0.30 | | Electronics | 8% | | | Grocery | 8-15% | $0.30 | | Jewelry | 20% (first $250), 5% (remainder) | $0.30 | | Personal Computers | 6% | $0.30 | **FBA Fees** (if using Fulfillment by Amazon): | Size Tier | Weight Range | Fee | |---|---|---| | Small standard | 0-0.5 lb | $3.22 | | Small standard | 0.5-1 lb | $3.40 | | Large standard | 0-0.5 lb | $3.86 | | Large standard | 0.5-1 lb | $4.08 | | Large standard | 1-2 lb | $4.76 | | Large standard | 2-3 lb | $5.33 | | Large standard | 3+ lb | $5.33 + $0.32/half-lb above 3 lb | **Monthly Storage Fees**: - Jan-Sep: $0.87 per cubic foot - Oct-Dec: $2.40 per cubic foot - Aged inventory surcharge: $6.90/cu ft after 271 days **Other Amazon Fees**: - Professional seller subscription: $39.99/month - Individual seller: $0.99/item (no subscription) - Removal/disposal: $0.97-$5.47 per unit - Return processing: Varies by category ### Step 3: Calculate eBay Fees **Final Value Fees** (per sale): | Category | Rate | Per-order fee | |---|---|---| | Most categories | 13.25% | $0.30 | | Books, Music, Movies | 14.95% | $0.30 | | Guitars | 6.35% | $0.30 | | Business & Industrial | 12.35% | $0.30 | | Collectibles | 12.35% | $0.30 | **eBay Store Subscriptions**: | Plan | Monthly | Annual (per month) | Free Listings | |---|---|---|---| | Starter | $7.95 | $4.95 | 250 | | Basic | $27.95 | $21.95 | 1,000 | | Premium | $74.95 | $59.95 | 10,000 | | Anchor | $349.95 | $299.95 | 25,000 | **Promoted Listings**: 2-20% of sale price (optional but increasingly necessary) ### Step 4: Calculate Etsy Fees | Fee Type | Rate | Notes | |---|---|---| | Listing fee | $0.20 per listing | Renews every 4 months or upon sale | | Transaction fee | 6.5% | On total sale price including shipping | | Payment processing | 3% + $0.25 | Etsy Payments | | Offsite ads fee | 12-15% | If sale comes from Etsy's ads (mandatory for sellers > $10K/yr) | | Etsy Plus | $10/month | Optional — custom domain, restock alerts | ### Step 5: Calculate Walmart Marketplace Fees | Category | Referral Fee | Notes | |---|---|---| | Most categories | 15% | | | Electronics | 8% | | | Personal Computers | 6% | | | Clothing | 15% | | | Jewelry | 20% (first $250) | | **WFS (Walmart Fulfillment Services)**: | Weight | Fee | |---|---| | 0-1 lb | $3.45 | | 1-2 lb | $4.95 | | 2-3 lb | $5.45 | | 3+ lb | $5.45 + $0.40/lb over 3 | No monthly subscription fee (significant advantage). ### Step 6: Calculate Shopify (DTC) Costs | Plan | Monthly | Transaction Fee | Payment Processing | |---|---|---|---| | Basic | $39/mo | 2% (non-Shopify Payments) | 2.9% + $0.30 | | Shopify | $105/mo | 1% | 2.7% + $0.30 | | Advanced | $399/mo | 0.6% | 2.5% + $0.30 | **Additional DTC costs to include**: - Shipping (you pay): $3-15/order depending on size/zone - App subscriptions: $50-300/month typical - Theme/design: $0-350 one-time - Marketing/CAC: $10-80 per customer acquired ### Step 7: Compare and Decide Build a comparison table per SKU: | Fee Component | Amazon FBA | eBay | Etsy | Walmart WFS | Shopify DTC | |---|---|---|---|---|---| | Selling price | $49.99 | $49.99 | $49.99 | $49.99 | $49.99 | | Referral/transaction fee | $7.50 | $6.92 | $3.25 | $7.50 | $0.00 | | Fulfillment fee | $4.76 | Self | Self | $4.95 | Self ($5.50) | | Payment processing | Incl. | Incl. | $1.75 | Incl. | $1.75 | | Listing fee | $0.00 | $0.00 | $0.20 | $0.00 | $0.00 | | Monthly sub (amortized) | $0.40 | $0.22 | $0.00 | $0.00 | $1.05 | | Storage (amortized) | $0.15 | $0.00 | $0.00 | $0.12 | $0.00 | | **Total fees** | **$12.81** | **$7.14** | **$5.20** | **$12.57** | **$8.30** | | COGS | $15.00 | $15.00 | $15.00 | $15.00 | $15.00 | | **Net profit/unit** | **$22.18** | **$27.85** | **$29.79** | **$22.42** | **$26.69** | | **Net margin** | **44.4%** | **55.7%** | **59.6%** | **44.8%** | **53.4%** | ���� ^ [\ H N� [� XY H �[� H �[ \�8�% � [��[ �[ X� [ۂ���� �� X� ��� ��H �[� K � �NK ���� ��L K�� �� � \ � [� ��Ͱ午� �� ������YH ��\ \�\�ۊ����H ��[X^�ۈ ��J��� �Y�\��[ ��H � ��H � � � ܘY�H � � �X� � H �� �LH �Y\ʊ�8��� �] LˍN �� JB�H ��] �J��� �[��X� [ۈ K� � ���\��[�� K�L� � \� [�� �� H �� ˌ� �Y\ʊ�8��� �] NK��H ���IJB�H ��� � Y�H ʊ�� ���\��[�� K�M � � \ [�� �L � �X� ��H H �� �� � �Y\ʊ�8��� �] M�� � M�� JB�����X��[Y[� ] [ۊ��� � \� ۈ ] �H Y� \� X\��[� �Z[ Z[� ]Y Y[��H �܈ [� XY JK� Y � � Y�H � �܈ �\ X] �\� �Y\�ˈ [X^�ۈ ۛ H Y� �� [YH �\� Y�Y\� H ��\� X\��[� ��[� �\�X�[ ] H ^JK����� ^ [\ H �� [ X� �ۚX�� X��\��ܞH ��[� 8�% ][ KP� [��[ � �] Y�B���� �� X� ��� ۙH � [� NK�NK ���� ˎ �� �� � \ � [� 0�Mp�LȈ �� � �� [YN� � [�] ��[۝ ������YH ��\ \�\�ۊ����H ��[X^�ۈ ��J��� �Y�\��[ K�� JH � ��H ˍ � � ܘY�H � H � �X� � � H �� K� ʊ�8��� �] LK�L� MK��JB�H ��P�^J��� ��� ��MH � � \ [�� ˍL H �� �� J��8��� �] K�� ��JB�H ���[ X\� єʊ�� �Y�\��[ K�� � є� ˍ H � � ܘY�H � H �� K� J��8��� �] LK�L MK�IJB�H ��� � Y�J��� ���\��[�� � � � \ [�� ˍL � �X� � H � �P� ˌ H �� ˍ ʊ�8��� �] �͈ ˎ JB�����X��[Y[� ] [ۊ��� [X^�ۈ [� �[ X\� �X\� H Y [� X�[ X\��[��8�% ][�� ۈ �� �܈ X^ [][H �XX� � P�^H \� �\ [Y[� \�K� � � Y�H � ۛ H �܈ ��[� �Z[ [�� �P� XZ�\� ] X\� �ٚ] X� H [� [ ܙ�[�X� �Y��X� �Z[ �K����� ��[[ۈ Z\� Z�\�K� ��ۛ H ��[� [�� H �Y�\��[ �YJ��8�% �Y�\��[ �Y\� \�H �\� H � \� � ��K � ܘY�K �] \�� ���\��[�� [� Y �\� \�[�� \ X�[ H Y L L� H [ܙH [� ��� ˂���� ��Yۛܚ[�� ۙ�] \�H � ܘY�H �Y\ʊ�8�% [X^�ۈ � \��\� ��L ��H � �\�� \��H Y� \� ��H ^\ˈ � ��[[ݚ[�� [��[� ܞH �[� �X��YH H �\� �Z[����ˈ ���ܙ�] [�� �] \�� ���\��[�� ��� ʊ�8�% [X^�ۈ �] \�� �] \� ]�\�Y�H MKL� H [� ��YH �] Y�ܚY\ˈ XX� �] \�� ��� � �M� [� ���\��[�� [� ٝ [� �\�[ � [� [��[ X� H [��[� ܞK��� � ���� [[ܝ ^�[�� �X��ܚ\ [ۈ ��� ʊ�8�% H �K�NK�[۝ [X^�ۈ �ٙ\��[ۘ[ �X��ܚ\ [ۈ Y � � �[�] Y� [�H �[ L [�] � �] ۛ H � �[�] ] K [�] ˈ �� [YH X] \�˂��K� ����\ \�[�� ܛ��� X\��[�� Xܛ��� � [��[ ʊ�8�% XX� � [��[ \� Y��\�[� �YH � �X� \�\ˈ ��\ \�H �] �ٚ] \� [�] Y� \� S �Y\� �� ܛ��� X\��[�˂���� ��Yۛܚ[�� Y �\� \�[�� ��� ʊ�8�% ۈ [X^�ۋ ܙ�[�X� �\�X�[ ] H �\]Z\�\� � � [� � �Y �] L L�IH و �]�[�YH �܈ Y �\� \�[�� \� X�X[ H [� H �\�� � [۝ ˂��ˈ ��ܛۙ� �] Y�ܞH �[ X� [ۊ��8�% ��YH �� X� � �[� Y�] [X] [ H \� [� ][ \ H �] Y�ܚY\� �] Y��\�[� �Y�\��[ �] \ˈ H �H Y��\�[��H [� �Y�\��[ �YH ۈ H L ] [H \� ˍL �[�] ��� � ����H �� ��H Z\��[ �[ ] [ۊ��8�% ��H \ۉ� [ �^\� � X\ \�� �܈ \��K Y� �ZY� ] [\� �[ �Y�[ �[ Y[� �[� �]�H � ML H ۈ �[ �[ Y[� ��� ˂��K� ��ݙ\� ���[�� ] �I�� ٙ��] H Y � �YJ��8�% ۘ�H [�H ^ �YY L � [� �Z[ [�� L�[[۝ �[ \� ] �H � \��\� L�LMIH ۈ �[ \� ���H Z\� Y �8�% [� ] �� X[� ] ܞK���L � ���� �X� ܚ[�� �P� �܈ ʊ�8�% � � Y�H ���� � X\ \� ۈ �[��X� [ۈ �Y\� [ ۙK �] �\� �Y\� X�]Z\�] [ۈ ��� � L N ��\� �Y\�H XZ�H ] H [�� ^ [��]�H � [��[ \� �\�� �[ K����� �\��\��\�H ��] ] [\ ] WJ �Y�\�[��\���] ] ] [\ ] K�Y H8�% � [��[ �ٚ] X�[ ] H ��\ \�\�ۈ [\ ] B�H љYH �] H �\� J �Y�\�[��\�ٙYK\�] KX�\� �Y H8�% �\��[� �YH �� Y [ \� �܈ [ XZ�܈ X\��] X�\H �� [Z^�] [ۈ � �] Y�Y\�J �Y�\�[��\��� [Z^�] [ۋ\� �] Y�Y\˛Y H8�% X� X�� � �Y X�H X\��] X�H �Y\H �]X[ ] H � X�� \� J \��] ��]X[ ] KX� X�� \� �Y H8�% �YH �[ �[ ] [ۈ �[ Y ] [ۈ � X�� \�


Security scan verdicts — ClawScan: suspicious | static analysis: clean | VirusTotal: clean | SkillSpector: clean (LOW)