How to Compare Prices Across Marketplaces with Claude
Use Claude and ToolRouter to compare prices across marketplaces. Find the best deals by searching multiple sources at once.
Tool
Find the best deal on a specific product by searching multiple marketplaces and comparing prices, conditions, and seller details side by side. Claude excels at reasoning through trade-offs between price, condition, shipping cost, and seller reliability to recommend the strongest option.
Connect ToolRouter to Claude
1Go to Settings → Connectors → Add custom connector
2Enter the details below and click Add
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Done — works on Claude chat, desktop, and mobile
Steps
Once connected (see setup above), use the Marketplace Search tool:
- Specify the product, acceptable condition range, and any constraints like maximum price, preferred region, or shipping method.
- Use `marketplace-search` with `search_listings` to pull results from multiple sources. Then use `listing_details` to inspect the top candidates.
- Ask Claude to rank the listings by total cost including shipping, flag any suspicious pricing, and recommend the best option with reasoning.
Example Prompt
Try this with Claude using the Marketplace Search tool
Use marketplace-search to find a used Nintendo Switch OLED across UK marketplaces. Search listings from all available sources, pull details on the five cheapest, and rank them by total cost including shipping. Flag anything that looks too cheap to be real.
Tips
- Include shipping and fees in total cost comparisons or the cheapest listing price might not be the best deal.
- Ask Claude to flag listings with vague descriptions or stock photos as potential scam indicators.
- Narrow by condition early to avoid comparing mint-condition items against heavily used ones.