---
title: ToolRouter — Agent Use Case Guide
description: Step-by-step guide for completing a task with a specific AI agent using ToolRouter.
url: https://toolrouter.com/tools/marketplace-search/use-cases/compare-prices-across-marketplaces/chatgpt
---
# How to Compare Prices Across Marketplaces with ChatGPT

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.

## Setup

{"mcpServers":{"toolrouter":{"command":"npx","args":["-y","toolrouter-mcp"]}}}

## Steps

1. Connect ToolRouter in ChatGPT: {"mcpServers":{"toolrouter":{"command":"npx","args":["-y","toolrouter-mcp"]}}}
2. Describe the product, your budget, condition preferences, and who the comparison is for.
3. Use `marketplace-search` with `search_listings` across sources and `listing_details` on the strongest candidates.
4. Have ChatGPT format the results as a comparison table with price, condition, shipping, and a recommendation summary.

## Example Prompt

```
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.
