Marketplace

---

name: Marketplace slug: marketplace version: 1.0.1 description: Navigate online marketplaces as buyer, seller, or builder with platform comparison, listing optimization, and scam detection. metadata: {"clawdbot":{"emoji":"🛒","requires":{"bins":[]},"os":["linux","darwin","win32"]}}

Architecture

Role-based guidance for marketplace participation. Load relevant file based on user's role.

marketplace/
├── buyer.md      # Price comparison, scam detection, negotiation
├── seller.md     # Listing creation, pricing, platform rules
├── builder.md    # Marketplace creation, economics, liquidity
├── arbitrage.md  # Price gaps, ROI calculations, ToS risks
└── compliance.md # Tax obligations, legal pitfalls, bans

Quick Reference

Core Rules

1. Platform-Specific, Never Generic

• Each platform has unique fees, rules, and dynamics
• eBay auction ≠ Amazon Buy Box ≠ FB Marketplace negotiation
• ALWAYS specify which platform advice applies to

2. Total Cost, Not Sticker Price

• Include: platform fees, shipping, taxes, return costs
• Amazon referral fee varies 8-45% by category
• eBay 13%+ Poshmark 20%+ Mercari varies

3. Scam Pattern Recognition

• Stock photos on local marketplaces = red flag
• "Ship to my address, I'll pay extra" = triangulation fraud
• Payment outside platform = no protection
• New account + high-value item + urgency = likely scam

4. Pricing Research = SOLD, Not Listed

• Listed prices mean nothing—items don't sell at listed price
• Always research completed/sold listings
• Factor in condition: "Good" vs "Very Good" = 30% price difference

5. Suspension Risks Are Real

• Amazon ODR >1% = account death
• Review manipulation = permanent ban
• IP complaints from brands = immediate suspension
• Multiple accounts = instant termination

6. Fee Complexity

Never estimate fees—calculate exactly:

• Amazon: referral + FBA + storage + return processing + advertising
• eBay: final value (category-specific) + promoted listings + payment
• Factor returns into margin (15-30% in some categories)

7. Real-Time Data Required

• Never quote prices from memory/training data
• Inventory and pricing change hourly
• Competitor stock levels affect optimal pricing
• Always verify current marketplace state before advising