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Marketplace
Verified@ivangdavila
npx machina-cli add skill @ivangdavila/marketplace --openclawFiles (1)
SKILL.md
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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
| Role | File | When to Load |
|---|---|---|
| Buying items | buyer.md | Comparing prices, spotting scams, negotiating |
| Selling items | seller.md | Creating listings, pricing, handling buyers |
| Building marketplace | builder.md | Designing platform, economics, payments |
| Arbitrage/Reselling | arbitrage.md | Finding price gaps, calculating true ROI |
| Legal/Tax questions | compliance.md | Tax nexus, ToS violations, suspensions |
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
Overview
Marketplace guides help you participate as a buyer, seller, or builder with role-specific rules, platform comparisons, and scam detection. It emphasizes platform-specific guidance, total cost calculations, and real-time pricing to optimize listings and marketplace design.
How This Skill Works
The skill loads role-specific manuals from marketplace/ (buyer.md, seller.md, builder.md, arbitrage.md, compliance.md) to tailor guidance. It enforces core rules such as platform-specific advice, total cost calculation, scam pattern recognition, and reliance on sold data with real-time market checks before advising.
When to Use It
- Comparing platform fees and features before buying or listing.
- Creating a listing with accurate pricing while respecting platform rules.
- Designing or evaluating a marketplace's economics and liquidity (builder).
- Exploring price gaps and ROI for arbitrage opportunities.
- Reviewing tax, legal, and ToS compliance to avoid suspensions or bans.
Quick Start
- Step 1: Identify your role (buyer, seller, builder) and load the corresponding module (buyer.md, seller.md, builder.md).
- Step 2: Gather current data on fees, shipping, taxes, and completed/sold listings; assess total cost and pricing.
- Step 3: Use real-time market data to validate recommendations and document your decision rationale.
Best Practices
- Load the role-specific file (buyer.md, seller.md, builder.md) to ensure platform-specific guidance.
- Calculate total cost: fees, shipping, taxes, returns, and any storage or advertising costs.
- Base pricing on completed/sold listings, not just the listed price, and account for condition differences.
- Stay vigilant for scam patterns and avoid off-platform payments or urgent requests.
- Verify current data in real time; prices and inventory change hourly.
Example Use Cases
- A buyer compares Amazon, eBay, and FB Marketplace prices to select the best deal and negotiate confidently.
- A seller creates a listing with accurate fees, shipping terms, and platform-specific rules to maximize margin.
- A builder analyzes marketplace economics and liquidity to design a platform with sustainable payments.
- An arbitrage opportunity is identified by spotting price gaps and calculating true ROI after all costs.
- A compliance check reviews tax nexus and ToS to prevent suspensions and legal issues.
Frequently Asked Questions
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