How to Compare Prices Across Marketplaces with ChatGPT
Use ChatGPT and ToolRouter to compare prices across marketplaces. Search multiple sources to find the best deal.
Tool
Find the best deal on a specific product by searching multiple marketplaces and comparing prices, conditions, and seller details side by side. ChatGPT is well suited for turning raw listing data into a clean comparison table or buying recommendation for a teammate or client.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
Steps
Once connected (see setup above), use the Marketplace Search tool:
- Describe the product, your budget, condition preferences, and who the comparison is for.
- Use `marketplace-search` with `search_listings` across sources and `listing_details` on the strongest candidates.
- Have ChatGPT format the results as a comparison table with price, condition, shipping, and a recommendation summary.
Example Prompt
Try this with ChatGPT using the Marketplace Search tool
Use marketplace-search to find a used Nintendo Switch OLED across UK marketplaces. Search all sources, get details on the top five, and return a comparison table with price, condition, shipping cost, and a recommendation for which to buy.
Tips
- Ask ChatGPT to include a total-cost column that combines listing price, shipping, and any platform fees.
- Request a one-paragraph buying recommendation at the top for quick decision-making.