---
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/track-price-trends/chatgpt
---
# How to Track Price Trends with ChatGPT

Monitor how prices change over time by running regular searches and saving watchlist snapshots for comparison. ChatGPT is a strong fit for turning snapshot data into clear trend summaries with buying recommendations.

## 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, filters, and how often you plan to check pricing.
3. Run `search_listings` and `watchlist_snapshot` through `marketplace-search` to capture the current data point.
4. On subsequent runs, ask ChatGPT to compare snapshots and produce a trend summary with a buy-or-wait recommendation.

## Example Prompt

```
Use marketplace-search to search for used AirPods Pro 2 across UK marketplaces and save a watchlist snapshot. Summarize the current price range and how it compares to last week. Give me a clear buy or wait recommendation.
```

## Tips

- Ask ChatGPT to present trends as percentage changes for quick scanning.
- Request a one-line verdict at the top of each trend update for fast decision-making.
